| DQR ID | Subject | Affected Data Streams | Data Quality Metric |
|---|---|---|---|
| D990127.7 | SGP/EBBR/E26 - Battery Voltage Low, Data Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D020717.39 | SGP/EBBR/E26 - Multiplexer 2 Failure From High Temperature | sgp30ebbrE26.b1 | Suspect |
| D031222.24 | SGP/EBBR/E26 - Wind Speed Sensor Frozen By Ice Storm | sgp30ebbrE26.b1 | Incorrect |
| D000623.9 | SGP/EBBR/E26 - All Data Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D990127.42 | SGP/EBBR/E26 - Wind Speed Data Incorrect | sgp15ebbrE26.b1 | Incorrect |
| D010723.3 | SGP EBBR E26 - Soil Moisture #1 Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D951016.1 | SGP/EBBR/E26 - Battery Voltage Drop | sgp5ebbrE26.b1 | Incorrect |
| D000221.3 | SGP/EBBR/E26 - Right Aspirator Not Working | sgp30ebbrE26.b1 | Incorrect |
| D960501.4 | SGP/EBBR/E26 - Right Air Temp Malfunction | sgp30ebbrE26.b1 | Incorrect |
| D940606.1 | SGP/EBBR/E26 - Wind Speed Malfunction | sgp30ebbrE26.b1 | Incorrect |
| D030712.23 | SGP/EBBR/E26 - 6 Month Checks | sgp30ebbrE26.b1 | Incorrect |
| D020716.18 | SGP/EBBR/E26 - 6 Month Checks | sgp30ebbrE26.b1 | Incorrect |
| D960508.10 | SGP/EBBR/E26 - 3-month check | sgp30ebbrE26.b1 | Incorrect |
| D030919.11 | SGP/EBBR/E26 - Soil Storage Incorrect; Surface Fluxes Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D031103.1 | SGP/EBBR/E26 - AEM Home Signals Incorrect, Surface Fluxes Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D940606.2 | SGP/EBBR/E26 - Wind Direction Sensor Failure | sgp30ebbrE26.b1 | Incorrect |
| D971021.9 | SGP/EBBR/E26 - EBBR Biannual Checks | sgp30ebbrE26.b1 | Incorrect |
| D960104.8 | SGP/EBBR/E26 - Right Tair Offscale | sgp30ebbrE26.b1 | Incorrect |
| D010605.24 | SGP EBBR E26 - Soil Heat Flow #2 Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D030711.6 | SGP/EBBR/E26 -Right Air Temperature Incorrect | sgp5ebbrE26.b1 | Incorrect |
| D961122.4 | SGP/EBBR/E26 - Annual Calibration Changeout | sgp30ebbrE26.b1 | Missing |
| D010213.12 | SGP/EBBR/E26 - Wind Speed Iced | sgp15ebbrE26.b1 | Incorrect |
| D000627.7 | SGP/EBBR/E26 - Soil Heat Flow #1 Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D940329.1 | SGP/EBBR/E26 - Wind Direction Sensor Malfunction | sgp30ebbrE26.b1 | Incorrect |
| D000623.10 | SGP/EBBR/E26 - EBBR E26 All Data Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D000210.1 | SGP/EBBR/E26 - Temperature from Left T/RH Probe Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D000623.1 | SGP/EBBR/E26 - EBBR E26 Left Aspirator Not Working | sgp30ebbrE26.b1 | Suspect |
| D971027.9 | SGP/EBBR/E26 - Bad Dates | sgp30ebbrE26.b1 | Incorrect |
| D951116.3 | SGP/EBBR/E26 - Wind Speed Cups Frozen | sgp30ebbrE26.b1 | Incorrect |
| D950626.10 | SGP/EBBR/E26 - Stopped Ventilation Fan | sgp30ebbrE26.b1 | Incorrect |
| D000623.2 | SGP/EBBR/E26 - All Data Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D990409.6 | SGP/EBBR/E26 - Calibration Changeout | sgp30ebbrE26.b1 | Missing |
| D000627.8 | SGP/EBBR/E26 - Soil Heat Flow #2 Large Negative | sgp30ebbrE26.b1 | Incorrect |
| D000225.1 | SGP/EBBR/26 - Low Battery Condition | sgp5ebbrE26.b1 | Suspect |
| D960119.3 | SGP/EBBR/E26 - Right tair Offscale | sgp30ebbrE26.b1 | Incorrect |
| D961122.13 | SGP/EBBR/E26 - Right Air Temperature Malfunction | sgp30ebbrE26.b1 | Incorrect |
| D050324.3 | SGP/EBBR/E26 - Incorrect soil type coefficients used | sgp30ebbrE26.b1 | Incorrect |
| D010723.8 | SGP EBBR E26 - Some Data Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D010605.22 | SGP EBBR E26 - All Data Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D990129.5 | SGP/EBBR/E26 - Battery Voltage Low | sgp5ebbrE26.b1 | Incorrect |
| D951113.4 | SGP/EBBR/E26 - Right Tair Offscale | sgp30ebbrE26.b1 | Incorrect |
| D030128.4 | SGP/EBBR/E26 - Left Air Temperature Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D990622.7 | SGP/EBBR/E26 - Battery Wire Problem Causes Questionable Data | sgp5ebbrE26.b1 | Suspect |
| D030110.27 | SGP/EBBR/E26 - Data Incorrect during 6 month checks | sgp30ebbrE26.b1 | Incorrect |
| D940211.1 | SGP/EBBR/E26 - Invalid data during Preventative Maintenance | sgp30ebbrE26.b1 | Incorrect |
| D030117.27 | SGP/EBBR/E26 - Multiplexer Problem | sgp30ebbrE26.b1 | Incorrect |
| D030128.2 | SGP/EBBR/E26 - AEM Hung | sgp5ebbrE26.b1 | Incorrect |
| D010723.4 | SGP EBBR E26 - AEM Inbetween, Data Incorrect | sgp5ebbrE26.b1 | Incorrect |
| D030128.3 | SGP/EBBR/E26 - Data zeros following logger restart | sgp30ebbrE26.b1 | Incorrect |
| D950626.19 | SGP/EBBR/E26 - Right Air Temperature Malfunction | sgp5ebbrE26.b1 | Incorrect |
| D030514.8 | SGP/EBBR/E26 - E26 EBBR Soil Heat Flow #1 Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D000627.10 | SGP/EBBR/E26 - Left Air Temperature Periodically Incorrect | sgp5ebbrE26.b1 | Suspect |
| D980529.17 | SGP/EBBR/E26 - Six Month Checks | sgp30ebbrE26.b1 | Incorrect |
| D031204.21 | SGP/EBBR/E26 - 6 Month Checks | sgp30ebbrE26.b1 | Incorrect |
| D941021.11 | SGP/EBBR/E26 - Net Radiometer Hemisphere Changes | sgp5ebbrE26.b1 | Suspect |
| D030728.4 | SGP/EBBR/E26 - Soil Heat Flow #5 Large Positive | sgp30ebbrE26.b1 | Incorrect |
| D950308.3 | SGP/EBBR/E26 - Frozen Wind Speed Sensor | sgp30ebbrE26.b1 | Incorrect |
| D950921.4 | SGP/EBBR/E26 - AEM replacement | sgp30ebbrE26.b1 | Incorrect |
| D010723.5 | SGP EBBR E26 - Soil Heat Flow #5 Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D950626.14 | SGP/EBBR/E26 - Reprocess: Soil Heat Flow Sensor 1 Replacement | sgp30ebbrE26.b1 | Incorrect |
| D010605.20 | SGP EBBR E26 - Data Suspect, Low Battery Voltage | sgp30ebbrE26.b1 | Suspect |
| D940818.1 | SGP/EBBR/E26 - Soil Moisture Sensor Malfunction | sgp30ebbrE26.b1 | Incorrect |
| D020717.37 | SGP/EBBR/E26 - Measurements Zero | sgp30ebbrE26.b1 | Incorrect |
| D000623.3 | SGP/EBBR/E26 - Low Battery Voltage Causes Incorrect Data | sgp30ebbrE26.b1 | Incorrect |
| D021113.4 | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header | sgp30ebbrE13.b1 | Note |
| D960409.1 | SGP/EBBR/E26 - Right Air Temperature Malfunction | sgp30ebbrE26.b1 | Incorrect |
| D000623.7 | SGP/EBBR/E26 - Low Battery Voltage Causes Incorrect Data | sgp30ebbrE26.b1 | Incorrect |
| D990127.31 | SGP/EBBR/E26 - Wind Direction Data Incorrect | sgp5ebbrE26.b1 | Incorrect |
| D000627.6 | SGP/EBBR/E26 - Soil Heat Flow #5 Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D961122.5 | SGP/EBBR/E26 - Wind Direction Sensor Failure | sgp30ebbrE26.b1 | Incorrect |
| D011206.2 | SGP EBBR E26 - Battery Voltage Low | sgp30ebbrE26.b1 | Suspect |
| D020628.6 | SGP/EBBR/E26 - 3-month Check | sgp5ebbrE26.b1 | Incorrect |
| D041222.1 | SGP/EBBR/E26 - Spark Gap Bad, Pressure Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D010605.23 | SGP EBBR E26 - Soil Heat Flow #1 Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D941212.1 | SGP/EBBR/E26 - Wind Direction Sensor Affect on Soil Moisture 2 | sgp30ebbrE26.b1 | Incorrect |
| D960104.2 | SGP/EBBR/E26 - Wind Speed Cups Frozen | sgp5ebbrE26.b1 | Incorrect |
| D990421.2 | SGP/EBBR/E26 - Incorrect Data | sgp5ebbrE26.b1 | Incorrect |
| D000623.11 | SGP/EBBR/E26 - All Data Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D000623.6 | SGP/EBBR/E26 - Low Battery Voltage Causes Incorrect Data | sgp30ebbrE26.b1 | Incorrect |
| D011206.1 | SGP EBBR E26 - Low Battery Voltage | sgp30ebbrE26.b1 | Suspect |
| D941221.1 | SGP/EBBR/E26 - T/RH Check | sgp30ebbrE26.b1 | Incorrect |
| D970627.2 | SGP/EBBR/E26 - Reprocess: E26 Soil Heat Flow Sensor 1 Replacement | sgp30ebbrE26.b1 | Incorrect |
| D000301.9 | SGP/EBBR/E26 - Net Radiation Incorrect | sgp5ebbrE26.b1 | Incorrect |
| D020717.38 | SGP/EBBR/E26 - Measurements Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D980117.5 | SGP/EBBR/E26 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown) | sgp30ebbrE26.b1 | Incorrect |
| D020724.48 | SGP/EBBR/E26 - Annual Calibration Changeout | sgp30ebbrE26.b1 | Incorrect |
| D000627.9 | SGP/EBBR/E26 - Left Air Temperature Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D000221.7 | SGP/EBBR/E26 - Anemometer Not Working, Wind Speed Incorrect | sgp15ebbrE26.b1 | Incorrect |
| D980117.22 | SGP/EBBR/E26- EBBR Frozen Wind Speed | sgp30ebbrE26.b1 | Incorrect |
| D980117.33 | SGP/EBBR/E26 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected | sgp30ebbrE26.b1 | Incorrect |
| D030117.26 | SGP/EBBR/E26 - Measurements zero following logger restart | sgp30ebbrE26.b1 | Incorrect |
| D990127.43 | SGP/EBBR - EBBR E26 Wind Speed Data Incorrect | sgp30ebbrE26.b1 | Suspect |
| D961122.12 | SGP/EBBR/E26 - Wind Direction Sensor Failure | sgp30ebbrE26.b1 | Incorrect |
| D010723.7 | SGP EBBR E26 - Some Data Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D050719.15 | SGP/EBBR/E26 - Improved EBBR CR10 Program | sgp30ebbrE26.b1 | Note |
| D961122.28 | SGP/EBBR/E26 - EBBR 3 Month Checks - 10 EFs | sgp5ebbrE26.b1 | Incorrect |
| D031222.25 | SGP/EBBR/E26 - Wind Direction Sensor Frozen By Ice Storm | sgp30ebbrE26.b1 | Incorrect |
| D990622.6 | SGP/EBBR/E26 - Battery Wire Problem Causes Incorrect Data | sgp5ebbrE26.b1 | Incorrect |
| D000623.8 | SGP/EBBR/E26 - All Data Incorrect | sgp5ebbrE26.b1 | Incorrect |
| D000627.11 | SGP/EBBR/E26 - Reference Temperature Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D000623.5 | SGP/EBBR/E26 - Low Battery Voltage Causes Incorrect Data | sgp30ebbrE26.b1 | Incorrect |
| D011127.34 | SGP EBBR E26 - Data Incorrect During 6 Month Checks | sgp30ebbrE26.b1 | Incorrect |
| D021113.1 | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header | sgp30ebbrE9.b1 | Note |
| D000622.1 | SGP/EBBR/E26 - Reprocess: Soil Moisture Off-Scale | sgp30ebbrE26.b1 | Suspect |
| D980507.5 | SGP/EBBR/E26 - Character In EBBR E26, 30 Minute Data | sgp30ebbrE26.b1 | Incorrect |
| D951016.2 | SGP/EBBR/E26 - Net Radiometer Dome Punctured | sgp30ebbrE26.b1 | Incorrect |
| D950626.5 | SGP/EBBR/E26 - Frozen Wind Speed Sensor | sgp5ebbrE26.b1 | Incorrect |
| D030117.29 | SGP/EBBR/E26 - Battery Voltage Low | sgp30ebbrE26.b1 | Incorrect |
| D940301.2 | SGP/EBBR/E26 - Winds, SM2 Invalid data 10/10/93 - 2/2/94 | sgp30ebbrE26.b1 | Incorrect |
| D051112.9 | SGP/EBBR/E26 - metadata corrections | sgp30ebbrE26.b1 | Note |
| D030117.28 | SGP/EBBR/E26 - Water in broken Net Radiometer Dome | sgp30ebbrE26.b1 | Incorrect |
| D010605.25 | SGP EBBR E26 - Soil Heat Flow #3 Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D000627.4 | SGP/EBBR/E26 - Electronics Problem | sgp30ebbrE26.b1 | Incorrect |
| D000211.13 | SGP/EBBR/E26 - Left T/RH Probe Temperature Data Incorrect | sgp30ebbrE26.b1 | Incorrect |
| D950626.9 | SGP/EBBR/E26 - Frozen Wind Speed Sensor | sgp30ebbrE26.b1 | Incorrect |
| D980416.18 | SGP/EBBR/E26 - 3-Month Check | sgp5ebbrE26.b1 | Incorrect |
| D970330.6 | SGP/EBBR/E26 - Wind Direction Sensor Failure | sgp5ebbrE26.b1 | Incorrect |
| D950908.2 | SGP/EBBR/E26 - AEM not exchanging | sgp5ebbrE26.b1 | Incorrect |
| D031211.3 | SGP/EBBR/E26 - Spark Gap Bad, Pressure Incorrect | sgp30ebbrE26.b1 | Incorrect |
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-01-09 | 02:00:00 | 1999-01-14 | 18:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Battery Voltage Low, Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Battery voltages less than 10.4 volts occurred some of the time. All data should be considered incorrect when the voltage is less than 10.4 volts. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-06-01 | 21:15:00 | 2002-06-30 | 23:56:00 | Suspect |
| Subject: | SGP/EBBR/E26 - Multiplexer 2 Failure From High Temperature |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Multiplexer 2 is failing during times of control box temperatures above 29 degrees C. The failure begins in the last channel and progresses to lower channels as the temperature increases. It has not yet been determined whether the failure is in the relays or a solid state component of the multiplexer. This condition is probably due to the aging of the device and the millions of cycles that this 10 year old device has made. More failures of this sort may occur in the future. A cure is being sought aside from replacement of the multiplexers to prevent the problem. The indicated measurements need to be inspected to determine which ones are usable. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-12-12 | 19:35:00 | 2003-12-14 | 16:15:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Speed Sensor Frozen By Ice Storm |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The wind speed sensor was frozen stopped by ice from a storm. The wind speed and residual wind speed measurements are incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-03-15 | 10:30:00 | 2000-03-15 | 14:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - All Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | All data was incorrect for an unknown reason. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-01-08 | 03:15:00 | 1999-01-09 | 06:00:00 | Incorrect |
| 1998-12-21 | 07:05:00 | 1998-12-24 | 16:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Speed Data Incorrect |
|---|---|
| Affected Datastreams: | sgp15ebbrE26.b1 |
| Description | The wind speed sensor was iced stopped by freezing rain, resulting in the following values being incorrect: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws, |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-04-06 | 17:30:00 | 2001-02-08 | 15:46:00 | Incorrect |
| Subject: | SGP EBBR E26 - Soil Moisture #1 Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil Moisture #1 was a constant 33.7 and was incorrect. Latent and Sensible Heat fluxes were normally minimally affected. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-09-27 | 21:00:00 | 1995-10-13 | 12:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Battery Voltage Drop |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | Shortly after the PM visit on September 26, 1995 the EBBR battery voltage at E26, Cement, OK declined to lower than acceptable levels. During the October 13, 1995 PM visit the battery was replaced. I do not know the specifics of why the battery voltage declined so suddenly, but failure of one or more of the battery cells is a possibility. I have not received the site operations log of the PM visit yet. The voltage dropped to 10 volts at night. At various times, soil temperature, soil heat flux plate output, and atmospheric pressure (at least) were not reported correctly by the CR10 datalogger. Amazingly, the AEM continued to work and reported millivolt outputs that did not fall below the acceptable ranges. All data between 2100 GMT on September 26, 1995 and 1230 GMT on October 13, 1995 should be considered suspect, particularly when the battery voltage fell below 11 volts (every nighttime). This general caution is issued because incorrect reporting of data also took place during times when the battery voltage was reported as 12 Volts, a normally acceptable level; the reason for this behavior is unknown. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-01-08 | 02:30:00 | 2000-01-27 | 17:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Right Aspirator Not Working |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The right aspirator fan did not work during the period. The following values were therefore incorrect: 5 minute: tair_top, tair_bot, thum_top. thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_l, mv_hum_l, tair_l 30 minute: tair_top, tair_bot, thum_top. thum_bot, hum_top, hum_bot, vp_top, vp_bot, e, h, bowen |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-04-23 | 15:00:00 | 1996-04-23 | 21:15:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Right Air Temp Malfunction |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The right air temperature probe malfunctioned and produced incorrect data during the period of time indicated above. The probe (S/N 92013) was replaced by Site Operations on 23 April 1996 at 2115 GMT with S/N 92002. The malfunction of the right air temperature probe results in incorrect Bowen ratio, sensible heat flux, and latent heat flux during the period indicated. The data values that are affected are: 5 minute: tair_top, tair_bot 15 minute: tair_r (1515-2115 GMT values) 30 minute: tair_top, tair_bot, bowen, e, and h (1530-2130 GMT values) |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1994-05-22 | 22:00:00 | 1994-05-25 | 16:45:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Speed Malfunction |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | For an unknown reason, the wind speed sensor at Cement began to record very low wind speeds on a consistent basis, with most of the speeds recorded reflecting what appeared to be zero wind speed (calibration offset). When the sensor was replaced on 5/25/94, it was damaged, although this damage apparently did not occur until a thunderstorm around midnight (local time) May 24. The wind direction sensor was also damaged by the storm at the same time. At any rate, the wind speed data during the period listed should be considered questionable. The wind speed sensor was replaced on May 25, 1994 at 1639. Old sensor S/N K1032, New sensor S/N K1035. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-04-17 | 14:45:00 | 2003-04-17 | 15:35:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - 6 Month Checks |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Many measurements were incorrect while the AEM was positioned with both aspirators at the same height for comparison checks. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-05-02 | 15:00:00 | 2002-05-02 | 15:31:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - 6 Month Checks |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The indicated measurements were incorrect during the 6 month checks. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-04-09 | 18:20:00 | 1996-04-09 | 20:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - 3-month check |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | During EBBR 3 month checks the Automatic Exchange Mechanism is disabled (reflected by home signals near zero) so that the two aspirator units can be placed at the same height. The measurements during this period, at least, do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), or latent heat flux (e), nor do the air temperature and relative humidity measurements indicate gradients. Checks performed before or after the AEM is disabled also lead to some incorrect data. The period of incorrect data for the EBBR is listed; data times affected do not include the beginning time and do include the ending time (data files are denoted by the end time). |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-08-21 | 16:00:00 | 2003-08-21 | 16:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Soil Storage Incorrect; Surface Fluxes Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The half hour after restart of the CR10 datalogger, the soil temperatures for the beginning of the period are missing. Therefore the soil energy storage and surface flux values are also incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-10-30 | 15:45:00 | 2003-11-13 | 15:45:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - AEM Home Signals Incorrect, Surface Fluxes Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | During a preventative maintenance visit to perform the 6-month calibrations, the home15 and home30 outputs began reading the same as one another. A fuse replacement and lubrication of the AEM sprockets on 11/13 corrected the problem. During the interval specified, the home15, home30, and sensible and latent heat fluxes are incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1994-05-25 | 04:30:00 | 1994-05-25 | 16:40:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Direction Sensor Failure |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Apparently, a fairly severe thunderstorm passed over the Cement, OK EBBR early on May 25, 1994 (around midnight May 24, local time). The storm damaged the wind direction sensor and the wind speed sensor. Wind Direction and Sigma of Wind Direction data for the period listed should be considered incorrect. The sensors were replaced on May 25, 1994 at 1631. Old sensor S/N K3038, New sensor S/N K3040. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1997-04-23 | 20:08:00 | 1997-04-23 | 20:50:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - EBBR Biannual Checks |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | During EBBR 3 month checks the Automatic Exchange Mechanism is disabled (reflected by home signals near zero) so that the two aspirator units can be placed at the same height. The measurements during these periods do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), or latent heat flux (e), nor do the air temperature and relative humidity measurements indicate correct gradients. Checks performed before or after the AEM is disabled also lead to some incorrect data. Incorrect 5, 15 minute and half hour data occurs for periods indicated. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-12-26 | 16:30:00 | 1995-12-31 | 19:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Right Tair Offscale |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | On 26 and 31 December 1995 at E26, Cement, OK EBBR the right thermocouple output went offscale. The cause for this is unknown and the sensor recovered fully. Five minute data would need to be inspected during the periods above for incorrect five minute values. Site Operations has been asked to check the sensor connections. Incorrect data for the period indicated includes: 5 minute: tair_top, tair_bot 15 minute: tair_r 30 minute: tair_top, tair_bot, bowen, h, e |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-03-04 | 15:00:00 | 2000-03-07 | 09:01:00 | Incorrect |
| 2000-02-18 | 03:30:00 | 2000-02-19 | 11:31:00 | Incorrect |
| Subject: | SGP EBBR E26 - Soil Heat Flow #2 Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil Heat Flow #2 was incorrect. Average soil heat flow, sensible heat flux, and latent heat flux were therefore also incorrect; these can be re-calculated from the remaining correct soil heat flows. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-01-24 | 16:35:00 | 2003-03-06 | 15:20:00 | Incorrect |
| Subject: | SGP/EBBR/E26 -Right Air Temperature Incorrect |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | One of the Right Air Temperature connections was loose, producing incorrect data. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-07-16 | 15:00:00 | 1996-07-16 | 22:30:00 | Missing |
| Subject: | SGP/EBBR/E26 - Annual Calibration Changeout |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | On 16 November 1996 the EBBR changeout for annual calibration occurred at E26, Cement, OK. SEBS unit 2 was removed and unit 8 was installed. Between 1500 and 2230 GMT no data or incorrect data was collected; most of the data is missing. 3 month calibration checks were being performed. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-12-25 | 06:00:00 | 2000-12-28 | 11:45:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Speed Iced |
|---|---|
| Affected Datastreams: | sgp15ebbrE26.b1 |
| Description | The anemometer was frozen stopped by freezing rain. Indicated data are incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-12-16 | 00:30:00 | 2000-03-07 | 14:55:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Soil Heat Flow #1 Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil Heat Flow #1 was incorrect, causing the indicated measurements to be incorrect. A broken sensor wire was at fault. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1994-03-07 | 14:00:00 | 1994-03-16 | 17:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Direction Sensor Malfunction |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The wind direction sensor malfunctioned, outputting nearly a constant value, invalidating the following data values. 30 minute: wind_d, sigma_wd, res_ws 15 minute: mv_wind_d 5 minute: wind_d, sigma_wd, res_ws The first good data after the affected period was the 1700 GMT, 30 minute data on March 16, 1994. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-02-22 | 13:30:00 | 2000-02-22 | 15:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - EBBR E26 All Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | All data was incorrect for an unknown reason. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-06-11 | 00:00:00 | 1999-06-29 | 21:45:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Temperature from Left T/RH Probe Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The temperature from the left T/RH probe went offscale frequently. This temperature is used in the calculation of the vapor pressure. Therefore, top and bottom Thum measurements, left Thum, top and bottom vapor pressure measurements, vapor pressure gradients, and the resulting latent and sensible heat fluxes and bowen ratio were frequently incorrect for the period stated. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-04-28 | 20:45:00 | 2000-05-04 | 15:00:00 | Suspect |
| Subject: | SGP/EBBR/E26 - EBBR E26 Left Aspirator Not Working |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The data is suspect because of inadequate aspiration for the sensors in the left aspirated radiation shield. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1997-09-10 | 00:00:00 | 1997-09-10 | 23:59:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Bad Dates |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | At the end of the netcdf 30 minute file for 10 September 1997 there are two half hours with date 9 September 1997, and time 2200 GMT. It is unknown how this happens, but it does occasionally. Those two half hour records should be ignored. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-11-11 | 02:40:00 | 1995-11-11 | 15:05:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Speed Cups Frozen |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Freezing rain, snow, and below freezing conditions during the night of 10-11 November 1995 resulted in the wind speed sensor cups becoming frozen in a stopped state at E26, Cement, OK on early 11 November 1995. When temperatures rose to almost freezing under cloudless skies later in the day, the ice thawed and the cups were free to turn again. Measurements affected by the stalled wind speed sensor include: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-04-11 | 12:30:00 | 1995-04-12 | 06:15:00 | Incorrect |
| 1995-04-12 | 13:15:00 | 1995-04-12 | 14:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Stopped Ventilation Fan |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | On April 11, 1995, a site operator discovered the right aspirator ventilation fan of the EBBR to be stopped. Inspection of the data indicates that this condition occurred during the two periods shown above; the fan apparently worked briefly inbetween the periods. Lack of ventilation of the temperature and relative humidity sensors attached to the AEM results in incorrect measurements of air temperature and relative humidity by the right aspirator probes, and therefore all quantities calculated from them, including sensible and latent heat fluxes, are incorrect as well. The quantities that are incorrect for the periods indicated are: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, and vp_bot 15 minute: rr_thum_r, mv_hum_r, tair_r 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-04-06 | 16:30:00 | 2000-04-06 | 17:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - All Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Data was incorrect because of Preventative Maintenance activities. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-04-01 | 14:15:00 | 1999-04-02 | 16:45:00 | Missing |
| Subject: | SGP/EBBR/E26 - Calibration Changeout |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The data from this period was either missing or incorrect during the calibration changeout of the EBBR unit. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-03-03 | 06:00:00 | 2000-03-07 | 14:55:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Soil Heat Flow #2 Large Negative |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil Heat Flow #2 was large negative and incorrect for an unknown reason. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-07-27 | 06:15:00 | 1999-08-12 | 16:00:00 | Suspect |
| Subject: | SGP/EBBR/26 - Low Battery Condition |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | When battery voltage was less than 10.4 V DC during this period, all data should be considered to be incorrect. The cause of the problem was a broken trace on J-panel #3. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-01-08 | 15:45:00 | 1996-01-09 | 13:30:00 | Incorrect |
| 1996-01-09 | 20:00:00 | 1996-01-09 | 20:30:00 | Incorrect |
| 1996-01-04 | 15:15:00 | 1996-01-05 | 04:30:00 | Incorrect |
| 1996-01-07 | 20:15:00 | 1996-01-07 | 23:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Right tair Offscale |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | On five days in January 1996 at E26, Cement, OK EBBR the right thermocouple output went offscale. The cause for this is unknown, although poor probe connections are common. Site Operation personnel tightened the probe connections in mid January. Five minute data would need to be inspected during the periods indicated for incorrect five minute values. Incorrect data for the period indicated includes: 5 minute: tair_top, tair_bot 15 minute: tair_r 30 minute: tair_top, tair_bot, bowen, h, e The data are not recoverable from other measurements. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-05-12 | 00:00:00 | 1996-07-05 | 23:59:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Right Air Temperature Malfunction |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The right air temperature probe malfunctioned again and produced incorrect data (outside of range) during some of the period indicated above. The cause of the problem is unknown. On 18 June site operations tightened the connection to the J-panel and repaired a broken aspirator fan wire. However, incorrect data resumed shortly after site operations left the site. Data continued to be incorrect during some times through July 5. No incorrect data was recorded from July 6 through July 17. The EBBR unit was changed out on July 17, 1996. The times of incorrect right air temperatures are easy to recognize from the EBBR data, so the precise times of incorrect data are not enumerated here. Typically, the top and bottom air temperature is out of range, resulting in the sensible heat flux being zero. The malfunction of the right air temperature probe results in incorrect Bowen ratio, sensible heat flux, and latent heat flux. The data values that are affected are: 5 minute: tair_top, tair_bot 15 minute: tair_r 30 minute: tair_top, tair_bot, bowen, e, and h |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-01-10 | 17:00:00 | 2005-03-03 | 16:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Incorrect soil type coefficients used |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The soil type coefficents for soil moisture were incorrect from the day of the system installation on, making soil moisture values too large. As a result, soil heat flows were overmeasured, and sensible and latent heat fluxes were underestimated. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2001-01-03 | 17:00:00 | 2001-01-03 | 17:01:00 | Incorrect |
| 2000-11-02 | 16:00:00 | 2000-11-02 | 16:01:00 | Incorrect |
| 2000-09-10 | 15:00:00 | 2000-09-10 | 15:01:00 | Incorrect |
| Subject: | SGP EBBR E26 - Some Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Since soil temperature was not available for the previous half hour, soil energy storage could not be calculated properly for the indicated period. The individual soil heat storage from the five soil sets, average soil heat flow, sensible heat flux, and latent heat flux are therefore incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-09-06 | 22:30:00 | 2000-09-06 | 22:31:00 | Incorrect |
| 2001-01-02 | 16:00:00 | 2001-01-02 | 22:01:00 | Incorrect |
| 2000-09-10 | 14:30:00 | 2000-09-10 | 14:31:00 | Incorrect |
| 2000-10-16 | 15:00:00 | 2000-10-16 | 15:01:00 | Incorrect |
| 2001-01-03 | 15:30:00 | 2001-01-03 | 16:31:00 | Incorrect |
| 2000-10-23 | 19:00:00 | 2000-10-23 | 19:01:00 | Incorrect |
| 2000-10-26 | 15:30:00 | 2000-10-26 | 16:01:00 | Incorrect |
| 2000-10-27 | 14:30:00 | 2000-10-27 | 15:01:00 | Incorrect |
| Subject: | SGP EBBR E26 - All Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | All data was incorrect during these periods for unknown reasons. However, this tends to happen during preventative maintenance visits if sensors have to be changed out or tested and the datalogger program is reloaded, or if the battery voltage is low. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1998-12-30 | 03:00:00 | 1998-12-30 | 13:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Battery Voltage Low |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | Battery voltage dropped below 10.4 volts. All data should be considered to be incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-11-01 | 15:45:00 | 1995-11-01 | 18:45:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Right Tair Offscale |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | On 1 November 1995 at E26, Cement, OK EBBR the right thermocouple output went offscale for a few hours. The cause for this is unknown and the sensor recovered fully. Incorrect data for the period above includes: 5 minute: tair_top, tair_bot 15 minute: tair_r, tair_l 30 minute: tair_top, tair_bot, bowen, h, e |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-01-14 | 17:25:00 | 2003-01-23 | 17:15:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Left Air Temperature Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The left air temperature was incorrect during the period. Poor electronic connections may have caused this. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-04-28 | 22:45:00 | 1999-04-29 | 06:00:00 | Suspect |
| Subject: | SGP/EBBR/E26 - Battery Wire Problem Causes Questionable Data |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | The battery voltage dropped to less than 10.4 volts, causing all data to be suspect for the time period. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-11-27 | 16:05:00 | 2002-11-27 | 16:35:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Data Incorrect during 6 month checks |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Some of the measurements are incorrect during the 6 month checks. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1993-12-28 | 16:45:00 | 1993-12-28 | 19:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Invalid data during Preventative Maintenance |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | During a preventative maintenance visit the +12V DC supply to the wind direction sensor at E26, Cement, Ok was temporarily disconnected, resulting in invalid wind direction data for December 28, 1993 from 1645 through 1900 GMT. The following fields are therefore invalid for that period: 30 minute: wind_d, sigma_wd, res_ws 15 minute: mv_wind_d 5 minute: wind_d, sigma_wd, res_ws. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-07-01 | 00:00:00 | 2002-07-11 | 13:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Multiplexer Problem |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | One of the multiplexers exhibited dropouts of the channels, beginning with the last channel at temperatures above about 30 C and moving backward through the channels as the temperature rose. High temperatures affected the switching speed of the multiplexer. This is the first time that this behavior has been documented in a Campbell Scientific multiplexer. The multiplexer had been in continuous field use for 10 years and had experienced probably more switching cycles than what is normally expected of the device in that period. The multiplexer was replaced to solve the problem. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-12-04 | 10:15:00 | 2003-01-10 | 16:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - AEM Hung |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | The AEM hung inbetween home positions during the period. The Bowen ratio, gradient measurements, sensible heat flux, and latent heat flux are incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-08-23 | 03:45:00 | 2000-08-23 | 04:01:00 | Incorrect |
| Subject: | SGP EBBR E26 - AEM Inbetween, Data Incorrect |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | While the AEM was inbetween the correct measurement positions the measurements from the two levels were incorrect. The sensible and latent heat fluxes and Bowen ratio were therefore incorrect also. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-01-10 | 19:00:00 | 2003-01-10 | 19:04:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Data zeros following logger restart |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Most measurements were zero after restart of the CR10 datalogger, after a calibration changeout of the EBBR unit. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-06-05 | 17:30:00 | 1995-06-05 | 19:00:00 | Incorrect |
| 1995-06-06 | 15:30:00 | 1995-06-06 | 19:00:00 | Incorrect |
| 1995-05-28 | 01:30:00 | 1995-06-01 | 16:30:00 | Incorrect |
| 1995-05-24 | 19:30:00 | 1995-05-28 | 01:00:00 | Incorrect |
| 1995-05-09 | 17:05:00 | 1995-05-16 | 19:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Right Air Temperature Malfunction |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | The right air temperature probe malfunctioned continuously during the periods of time indicated above as continuous. On May 16, 1995, by 1900 GMT, the probe was replaced (old S/N 92007, new S/N 92013). There was a complete loss of data between 1200 and 1900 GMT as Site Operations repaired a corroded battery terminal. For several days the right air temperature probe worked well. However, between May 24 and 28, the right air temperature probe malfunctioned continuously again. The right air temperature probe malfunctioned intermittently between May 28 and June 1, as well as during short periods on June 5 and 6. The cause of these latter periods is unknown; the time periods do not correspond with any Site Operations activities. During the intermittent periods the data that is not offscale should be viewed as questionable, as it is not always easy to detect what effect the malfunction might have had on that data. The malfunction of the right air temperature probe results in incorrect Bowen ratio, sensible heat flux, and latent heat flux during the periods indicated. The data values that are affected are: 5 minute: tair_top, tair_bot 15 minute: tair_r 30 minute: tair_top, tair_bot, bowen, e, h. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-04-19 | 19:00:00 | 2003-05-16 | 15:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - E26 EBBR Soil Heat Flow #1 Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil Heat Flow #1 was incorrect much of the time. The sensor was replaced. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-02-26 | 15:30:00 | 2000-04-20 | 14:50:00 | Suspect |
| Subject: | SGP/EBBR/E26 - Left Air Temperature Periodically Incorrect |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | Left air temperature periodically was incorrect, causing the indicated measurements to be incorrect. The user will need to inspect the data to see when the left air temperature was incorrect (compare left with right air temperature or with the humidity probe temperature). |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1998-05-19 | 16:46:00 | 1998-05-19 | 17:17:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Six Month Checks |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | During EBBR 6 month checks (formally called 3 month checks) the Automatic Exchange Mechanism is disabled (reflected by home signals near zero) so that the two aspirator units can be placed at the same height. The measurements during these periods do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), or latent heat flux (e), nor do the air temperature and relative humidity measurements indicate correct gradients. Checks performed just before or after the AEM is disabled also lead to some incorrect data. Incorrect 5, 15 minute and half hour data occurs for the period indicated. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-10-30 | 15:35:00 | 2003-10-30 | 16:15:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - 6 Month Checks |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Many measurements were incorrect while the AEM was positioned with both aspirators at the same height for comparison checks. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1994-09-14 | 16:00:00 | 1994-09-28 | 15:15:00 | Suspect |
| Subject: | SGP/EBBR/E26 - Net Radiometer Hemisphere Changes |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | The upper hemisphere of the net radiometer at the site was punctured allowing water to collect in the lower (and sometimes upper) section of the sensor. The punctures are most likely the result of migratory birds (a problem that we have experienced almost every year here at ANL also). The punctures (and water in some net radiometers) did not result in obvious invalidation of the data. Whether there is water in the lower hemisphere or not, a small puncture of the upper hemisphere would not have a major effect on the net radiation measurement. Significant amounts of water in the lower hemisphere should have a major effect on nighttime measurements particularly, although that effect is hard to detect in the data. The date when the puncture occurred is approximate - but is certainly no more than two weeks before the hemisphere was replaced. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-06-13 | 12:00:00 | 2003-06-13 | 12:30:00 | Incorrect |
| 2003-06-12 | 02:30:00 | 2003-06-12 | 03:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Soil Heat Flow #5 Large Positive |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil Heat Flow #5 was large positive for these two periods, for an unknown reason. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-02-16 | 15:00:00 | 1995-02-17 | 12:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Frozen Wind Speed Sensor |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | On February 16, 1994 a frontal system deposited freezing rain in central Oklahoma that resulted in the EBBR wind speed instrument becoming frozen in place at Cement (E26) for part of two days. All 5, 15, and 30 minute data values indicated below are incorrect for all times within the period indicated. 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-08-26 | 03:45:00 | 1995-09-12 | 20:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - AEM replacement |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Please see DQR P950908.2, where this problem was first documented. On August 26, 1995 at approximately 0345 GMT the gears on the lower sprocket shaft of the AEM appear to have been damaged, causing the AEM to stop exchanging. The home signal values then remained at around -0.5 for both home_15 and Home_30. On August 29 site operations personnel removed the fuse (to prevent exchange) with the left aspirator in the down position. On 12 September 1995 the AEM was replaced at 1959 GMT (old S/N 92004, new S/N 92008) and is functioning properly. Calculations of Bowen ratio, latent heat flux, and sensible heat flux are incorrect for all times during the period above. The data fields listed below are incorrect during the period: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, Bowen, e, h. It is not possible to reliably calculate the Bowen ratio, e, and h using the 15 minute data. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-04-15 | 15:30:00 | 2001-02-22 | 15:35:00 | Incorrect |
| Subject: | SGP EBBR E26 - Soil Heat Flow #5 Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil Heat Flow #5 was large negative during this period. Therefore, calculated average soil heat flow, latent heat flux, and sensible heat flux were incorrect. These measurements can be recalculated from the use of measurements from only soil heat flow sensors #1-4. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-04-26 | 19:45:00 | 1995-04-26 | 20:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Reprocess: Soil Heat Flow Sensor 1 Replacement |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | During preventative maintenance, site operations personnel observed that soil heat flow sensor #1 at Cement, OK (E26) was outputting larger values than the other four sensors. Therefore, they replaced sensor #1. A review of the data indicates that the sensor was not malfunctioning, but that its calibration was just too large. The longer the sensors are in the ground, the greater the likelihood that they will drift from their original calibration. The difference in the average soil heat flux caused by the #1 sensor data values being included in the average will have less than a 5% affect on the calculated latent and sensible heat fluxes. The data should therefore not be labelled as incorrect. However, during the replacement of sensor #1, the #1 data was spiked, causing the following data values to be incorrect for the period listed: 15 minute: mv_hft1 at 1945 GMT. 30 minute: shf5, c_shf5, g5, ave_shf, e, h, bowen at 2000 GMT. The latent and sensible heat fluxes can be recalculated by using only soil heat flows 2 through 5 to calculate the average soil heat flow, ave_shf = (g2 + g3 + g4 + g5)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q). |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-06-19 | 16:30:00 | 2000-06-19 | 17:31:00 | Suspect |
| 2000-06-20 | 14:30:00 | 2000-06-20 | 22:01:00 | Suspect |
| 2000-07-03 | 12:30:00 | 2000-07-03 | 13:16:00 | Suspect |
| 2000-06-19 | 19:00:00 | 2000-06-19 | 19:01:00 | Suspect |
| 2000-03-03 | 06:00:00 | 2000-03-07 | 09:01:00 | Suspect |
| 2000-03-24 | 01:00:00 | 2000-04-06 | 17:01:00 | Suspect |
| 2000-06-30 | 09:45:00 | 2000-06-30 | 13:46:00 | Suspect |
| 2000-06-19 | 08:30:00 | 2000-06-19 | 14:31:00 | Suspect |
| 2000-07-02 | 09:30:00 | 2000-07-02 | 16:01:00 | Suspect |
| Subject: | SGP EBBR E26 - Data Suspect, Low Battery Voltage |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The data measurements are suspect because of low battery voltage. Some measurements may be correct, but most are probably incorrect. Large home signals indicate very low battery voltage is present. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1994-07-31 | 21:00:00 | 1994-08-17 | 17:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Soil Moisture Sensor Malfunction |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil moisture sensor #1 at Cement, Ok, E26 began a slow drift downwards on July 31, 1994. This continued until the sensor was replaced at 1700 GMT on August 17, 1994. The downwards drift occured coincident with a constant decrease in soil moisture at the site. As a result, the average soil moisture (for the set of five sensors) was reduced by only about 2% (for a range of 10 to 22%), and thus had a negligible effect on the calculations of sensible and latent heat flux. The sm1 output dropped below zero at times during August 14-17. Soil Moisture #1 Data Fields: 15 minute: r_sm1 30 minute: sm1 |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-05-30 | 15:00:00 | 2002-05-30 | 15:01:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Measurements Zero |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The measurements are often zero after a CR10 datalogger restart, as occurred here. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-04-13 | 12:15:00 | 2000-04-13 | 14:15:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Low Battery Voltage Causes Incorrect Data |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Battery voltage below about 10.5 volts DC caused a number of the EBBR sensors to not measure correctly. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1993-12-01 | 12:00:00 | 2003-06-18 | 11:59:00 | Note |
| Subject: | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header |
|---|---|
| Affected Datastreams: | sgp30ebbrE13.b1 |
| Description | The units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in the EBBR 30 minute netcdf header have been incorrect from the beginning of processing the data into netcdf files. The correct units are MJ/m^3/C. This does not affect the data quality. (NOTE: The actual begin date of some of these data streams is as early as 7/4/93. This DQR applies to all 30m EBBR data.) |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-04-01 | 17:15:00 | 1996-04-01 | 18:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Right Air Temperature Malfunction |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The right air temperature probe malfunctioned and produced incorrect data during the period of time indicated above. The cause of the problem is unknown. The right air temperature probe appears to be working well presently. The malfunction of the right air temperature probe results in incorrect Bowen ratio, sensible heat flux, and latent heat flux during the period above. The data values that are affected are: 5 minute: tair_top, tair_bot 15 minute: tair_r (1715-1830 GMT values) 30 minute: tair_top, tair_bot, bowen, e, and h (1730-1830 GMT values) |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-04-16 | 08:45:00 | 2000-04-16 | 15:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Low Battery Voltage Causes Incorrect Data |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Battery voltage less than 10.5 volts DC causes some sensors to make incorrect measurements. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-01-08 | 08:35:00 | 1999-01-08 | 16:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Direction Data Incorrect |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | The wind direction sensor was iced stopped by freezing rain, resulting in the following values being incorrect: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, sigma_wd |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-04-06 | 18:00:00 | 2000-06-15 | 16:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Soil Heat Flow #5 Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil Heat Flow #5 was incorrect, causing the indicated measurements to be incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-11-06 | 20:00:00 | 1996-11-19 | 18:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Direction Sensor Failure |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Wind Direction and resultant wind speed data for much of the period listed above is incorrect. Wind directions of 135, 0, or 360 would continue for extended periods. This behavior is indicative of a failed sensor. This is a common malfunction in this style of wind direction sensor. A work request has been submitted to site operations for replacement of the sensor. All values of 135, 0, and 360 should be considered to be incorrect during the period above. Furthermore, more incorrect data may occur until the sensor is replaced (by 6 December). The affected data values are: 5 minute: wind_d, sigma_wd, res_ws 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd, res_ws |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2001-04-01 | 00:00:00 | 2001-08-23 | 15:30:00 | Suspect |
| Subject: | SGP EBBR E26 - Battery Voltage Low |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The battery voltage often dropped below 10.5 volts. All data for voltages below 10.5 volts should be considered to be incorrect. See the 15 minute data files, which contain the battery voltage, to determine when the data was incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-10-13 | 14:00:00 | 1995-10-13 | 17:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - 3-month Check |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | During EBBR 3 month checks the Automatic Exchange Mechanism is disabled (reflected by home signals near zero) so that the two aspirator units can be placed at the same height. The measurements during this period, at least, do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), or latent heat flux (e), nor do the air temperature and relative humidity measurements indicate gradients. Checks performed before or after the AEM is disabled also lead to some incorrect data. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-03-21 | 15:30:00 | 2003-10-12 | 23:55:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Spark Gap Bad, Pressure Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | In a trip to E26, I found that a bad spark gap through which the barometer was powered was causing pressure measurements to be incorrect. The pressure readings oscillated with the voltage of the EBBR battery. During daytime the voltage and thus the pressure would increase and vice versa during dark hours. Apparently only the positive side of the power supply was properly connected through the spark gap and thus the voltage received by the pressure sensor was lower than required to power it properly. Under this condition the perssure measurement varies with voltage level. The pressure measurements therefore had a diurnal signature and usually were incorrect. The decreased pressure during most times would cause latent heat flux to be slightly overestimated and sensible heat flux to be slightly underestimated. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-12-16 | 17:00:00 | 2000-03-03 | 09:31:00 | Incorrect |
| Subject: | SGP EBBR E26 - Soil Heat Flow #1 Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil Heat Flow #1 was incorrect because of a bad electronic connection. Average surface heat flow, sensible heat flux, and latent heat flux are incorrect as a result; these can be re-calculated by using the remaining correct soil heat flows. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1994-12-07 | 04:30:00 | 1994-12-07 | 08:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Direction Sensor Affect on Soil Moisture 2 |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | I have written a number of previous PIFs and DQRs about this same problem previously. This occurred most recently at E9, Ashton, KS in August 1994. The wind direction sensor is on the same data acquisition system multiplexer pair as soil moisture sensor 2. Sometimes a malfunctioning wind direction sensor (resulting in a constant wind direction of 135 degrees) will cause the soil moisture 2 measurement to be offscale. Between 0430 and 0800 GMT the wind direction sensor did not function properly at E22, Cordell, KS. As has often been the case, soil moisture measurements were affected for a shorter time period, from 0500 through 0730 GMT. The cause of this problem is unknown and only occurs on the multiplexer pair to which the wind direction sensor is connected, not on any other pair to which a soil moisture sensor is attached. None of the manufacturers of the applicable equipment can explain the problem. As done before, I will monitor the data for further occurrences of this condition; if the frequency of occurrence increases, further action will be taken. The following data and times are incorrect: Winds: 0430-0800 GMT 5 minute: wind_d, sigma_wd, res_ws 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd, res_ws Soil Moisture 2: 0500-0730 GMT 15 minute: r_sm2 30 minute: sm2, c_shf2, cs2, ces2, g2, ave_shf, h, e |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-12-18 | 21:10:00 | 1995-12-19 | 14:25:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Speed Cups Frozen |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | Freezing rain, snow, and below freezing conditions during 18-19 January 1995 caused the wind speed sensor cups to freeze in a stopped state at E26, Cement, OK on 18 January 1995. When temperatures rose to above freezing on 19 January, the ice thawed and the cups turned freely again. Measurements affected by the stalled wind speed sensor include: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-04-02 | 16:45:00 | 1999-04-02 | 18:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Incorrect Data |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | All data is incorrect for this time. This problem was related to changeout activities. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-02-22 | 23:00:00 | 2000-02-23 | 00:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - All Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | All data wqas incorrect for an unknown reason. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-04-14 | 06:15:00 | 2000-04-14 | 15:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Low Battery Voltage Causes Incorrect Data |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Battery voltage less than 10.5 volts DC causes some sensors to measure incorrectly. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-09-14 | 11:30:00 | 2001-03-31 | 23:56:00 | Suspect |
| Subject: | SGP EBBR E26 - Low Battery Voltage |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | During the indicated the period the battery voltage often dropped to 10.4 volts or below. At voltages less than 10.5 volts none of the selected measurements can be considered to be correct. The battery charging capacity was insufficient to maintain voltage at night. If the battery voltage is less than 10.5 volts (see battery voltage in the 15 minute data files), do not use the data. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1994-11-09 | 16:15:00 | 1994-11-09 | 18:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - T/RH Check |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 1615, 1620, 1625, 1630, 1635, 1640, 1645, 1650, 1655, 1700, 1705, 1710, 1715, 1720, 1725, 1730, 1735 15 minute: 1615, 1630, 1645, 1700, 1715, 1730, 1745 30 minute: 1630, 1700, 1730, 1800 (EDITOR'S NOTE: The following analysis refers to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-12-03 | 19:30:00 | 1997-06-17 | 20:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Reprocess: E26 Soil Heat Flow Sensor 1 Replacement |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Apparently, during installation of the present system on 17 July 1996, soil heat flow sensor #4 was intentionally placed upside down in the soil to produce the correct sign of flux. The leads from the sensor must have been connected with the wrong polarity. On 3 December 1996 site operations corrected some wiring problems and reconnected soil heat flow sensor #4 according to the proper color code; this caused the sign of the soil heat flow from that sensor to then be opposite of the other four sensors. All data from sensor #4 is the wrong sign during the period listed above. On 17 June 1997 site operations removed the sensor and installed it with the correct side up, fixing the problem. The result of this problem was a decrease of reported average soil heat flow of approximately 40%. This translates into a 0 to 20% error in latent and sensible heat fluxes (soil heat flow is rarely more than 50% of net radiation, upon which the Bowen ratio calculation depends). Therefore, sensible and latent heat fluxes were typically overestimated by about 10% during the daytime. This is of the same magnitude as the EBBR system/technique error. The following data values were affected for the period listed above: 15 minute: mv_hft4 30 minute: shf4, c_shf4, g4, ave_shf, e, h The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1, 2, 3, and 5 to calculate the average soil heat flow, ave_shf = (g1 + g2 + g3 + g5)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q). |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-09-25 | 07:00:00 | 1999-10-07 | 17:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Net Radiation Incorrect |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | The net radiometer top dome was broken and water had entered. Net radiation values are therefore incorrect during the period. The affected data are: 5 minute: q 15 minute: mv_q 30 minute: q, h, e |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-05-30 | 15:30:00 | 2002-05-30 | 15:31:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Measurements Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Change of energy storage (CES) measurements (calculated from the change of soil temperature with time) are sometimes incorrect after a CR10 program restart because the beginning measurement of the averaging period is zero. Average soil heat flow, sensible heat flux, and latent heat flux were affected and cannot be recalculated. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1998-01-08 | 01:00:00 | 1998-01-08 | 20:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown) |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The EBBR AEM stopped exchanging because of icing at during this time period. The calculations of Bowen ratio, latent heat flux, and sensible heat flux are incorrect for the time period indicated. The other measurements listed are also incorrect for those times: |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-07-17 | 14:00:00 | 1996-07-17 | 14:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Annual Calibration Changeout |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | On 16 November 1996 the EBBR changeout for annual calibration occurred at E26, Cement, OK. SEBS unit 2 was removed and unit 8 was installed. Data for half hours 1400 and 1430 GMT on 17 November is incorrect; 3 month calibration checks were being performed. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-02-25 | 21:45:00 | 2000-02-26 | 11:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Left Air Temperature Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Incorrect left air temperature caused the indicated measurements to be incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-09-25 | 06:35:00 | 1999-10-07 | 16:20:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Anemometer Not Working, Wind Speed Incorrect |
|---|---|
| Affected Datastreams: | sgp15ebbrE26.b1 |
| Description | The anemometer was not working during this period. The following values were therefore incorrect: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1998-01-07 | 19:50:00 | 1998-01-08 | 22:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26- EBBR Frozen Wind Speed |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Wind speed cups were frozen during the indicated time periods. All 5, 15, and 30 minute data values indicated are incorrect for the periods listed. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1997-12-16 | 20:00:00 | 1997-12-29 | 18:40:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The upper dome of the EBBR net radiometers was punctured. After the puncture, water collected in the top and/or bottom dome. The water was removed and the dome was replaced during PM visits. In some cases, the puncture and water resulted in incorrect data. Comparison with net radiation values from surrounding EBBR sites and the SIRS is neccesary to determine if the EBBR net radiation data are correct or incorrect. It is often difficult to tell from the data when the punctures occurred, but they would have existed for no more than 2 weeks, since the domes are checked during each two-weekly PM visit. Incorrect net radiation data results in the latent heat flux and sensible heat flux also being incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-07-11 | 16:00:00 | 2002-07-11 | 16:29:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Measurements zero following logger restart |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Most of the measurements were zero, which normally happens after a datalogger restart. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-01-08 | 03:15:00 | 1999-01-09 | 06:00:00 | Suspect |
| Subject: | SGP/EBBR - EBBR E26 Wind Speed Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The wind speed sensor was iced stopped by freezing rain, resulting in the following values being incorrect: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws, |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-07-24 | 10:15:00 | 1996-08-13 | 18:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Direction Sensor Failure |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Wind Direction and resultant wind speed data for the period listed above is incorrect. Wind direction would not record outside 0 to 20 degrees. This is a common malfunction in this style of wind direction sensor. The sensor was replaced on 13 August 1996. The old sensor S/N was K3038 and new sensor is S/N K3033. The affected data values are: 5 minute: wind_d, sigma_wd, res_ws 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd, res_ws |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-10-21 | 21:30:00 | 2000-10-21 | 21:31:00 | Incorrect |
| Subject: | SGP EBBR E26 - Some Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The reference temperature sensor malfunctioned, causing all associated measurements to be incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2001-04-01 | 00:00:00 | 2005-03-31 | 17:00:00 | Note |
| Subject: | SGP/EBBR/E26 - Improved EBBR CR10 Program |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Effective 20050331.1700, the EBBR.E26 CR10 program was revised to improve the quality of the primary measurements as follows: 1) An RMS procedure is used to determine max and min limits of acceptable soil heat flow. This is applied to the individual soil sets. Measurements outside the limits are rejected and the measurements within the limits are used to calculate the average soil heat flow. 2) Max and min limits are used to determine incorrect values of net radiation, sensible heat flux (h), latent heat flux (e), and automatic exchange mechanism (AEM) signal. If AEM signal is outside the limits, h and e are set to 999s. If net radiation is outside the limits, h and e are set to 999s. If h or e are outside the limits, h and e are set to 999s. Virtually no incorrect soil measurement will affect the primary measurements of h and e. By setting h and e to 999s, it can be easily seen that the primary variables are incorrect; no other interpretation is possible. Prior to 20050331, the improved CR10 program was NOT in effect. DQRs have been submitted for known instances of incorrect soil measurements which affected the quality of the primary measurements of h and e. Note: the DQR begin date is the begin date of the sgp30ebbrE26.b1 data stream. The earlier version of the CR10 program was also used on previous EBBR datastream names (e.g. sgp30ebbrE26.a1). ~ |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-10-24 | 15:50:00 | 1996-10-24 | 16:13:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - EBBR 3 Month Checks - 10 EFs |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | During EBBR 3 month checks the Automatic Exchange Mechanism is disabled (reflected by home signals near zero) so that the two aspirator units can be placed at the same height. The measurements during these periods do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), or latent heat flux (e), nor do the air temperature and relative humidity measurements indicate correct gradients. Checks performed before or after the AEM is disabled also lead to some incorrect data. Incorrect 5, 15 minute and half hour data occurs for periods indicated. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-12-12 | 21:40:00 | 2003-12-14 | 15:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Direction Sensor Frozen By Ice Storm |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The wind direction sensor was frozen stopped by ice from a storm. The wind direction, sigma_wd, and residual wind speed measurements are incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-04-15 | 18:30:00 | 1999-04-15 | 19:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Battery Wire Problem Causes Incorrect Data |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | The battery voltage dropped suddenly to 8 volts at 1900 GMT, making all data incorrect for that time. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-03-24 | 00:00:00 | 2000-03-24 | 00:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - All Data Incorrect |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | All data was incorrect for an unknown reason. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-03-07 | 09:00:00 | 2000-04-20 | 14:50:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Reference Temperature Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The reference temperature sensor did not work during the indicated period, causing the indicated measurements to be incorrect. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-04-13 | 17:45:00 | 2000-04-13 | 18:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Low Battery Voltage Causes Incorrect Data |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Battery voltage less than 10.5 volts DC causes some sensors to measure incorrectly. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2001-10-16 | 17:50:00 | 2001-10-16 | 19:21:00 | Incorrect |
| 2001-04-05 | 14:15:00 | 2001-04-05 | 15:46:00 | Incorrect |
| Subject: | SGP EBBR E26 - Data Incorrect During 6 Month Checks |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The data was incorrect during the 6 month checks. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2001-04-01 | 00:00:00 | 2003-06-18 | 23:59:00 | Note |
| Subject: | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header |
|---|---|
| Affected Datastreams: | sgp30ebbrE9.b1 |
| Description | The units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in the EBBR 30 minute netcdf header have been incorrect from the beginning of processing the data into netcdf files. The correct units are MJ/m^3/C. This does not affect the data quality. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-07-17 | 00:00:00 | 1999-04-01 | 14:10:00 | Suspect |
| Subject: | SGP/EBBR/E26 - Reprocess: Soil Moisture Off-Scale |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | During numerous periods within the days listed above, individual soil moisture probes indicate small positive or else negative values when soil moisture is high (greater than 35%). This situation has occured since the present EBBR unit was installed on 17 July 1996. The cause of the problem is inadequate range in the calibration curve equation. Cement soil is somewhat unique amongst the EBBR sites, as the soil is very sandy and porous; it can hold a larger amount of water per volume than the other soils. This high a soil moisture cannot be obtained with the calibration soil used by REBS. Therefore, the soil moisture equations need to be manipulated to allow larger soil moistures to be calculated. Much of the data from January 1998 is corrupted by this problem, making changes in the equations prudent. The soil moisture data must be inspected by the data user to see when soil moisture values for one or more probes is inconsistent with the others. Recalculation of ave_shf, e, and h must be made using only the soil moisture sets with correct soil moisture values. Affected data values are (# for probe number): 15 minute: rr_sm# 30 minute: sm#, c_shf#, cs#, ces#, g#, ave_shf, e, h Sensible, latent, and soil heat fluxes can be recalculated using the soil probe sets that provide correct data. For example, if soil moisture 2 is incorrect, ave_shf = (g1 + g3 + g4 + g5)/4 e = -(q + ave_shf)/(1 +bowen) h = -(e + ave_shf +q), If soil moisture 2 and 4 are incorrect, ave_shf = (g1 + g3 + g5)/3 e = -(q + ave_shf)/(1 +bowen) h = -(e + ave_shf +q), If soil moisture 2, 4, and 5 are incorrect, ave_shf = (g1 + g3)/2 e = -(q + ave_shf)/(1 +bowen) h = -(e + ave_shf +q), etc. On 5 May 1998 at 1815 GMT a calibration coefficient was changed in the CR10 program as a result of a BCR by the mentor. This coefficient has helped reduce the least severe problems but has not eliminated problems from large negative soil moistures measured even once during the integration period. However, now the incorrect average soil heat flow, latent heat flux, and sensible heat flux are so large, negative or positive, that they cannot be mistaken as being correct. The EBBR unit was replaced with a recalibrated system on 1 April 1999. The previous unit experienced soil moisture problems the entire time (almost 3 years) that the system was installed because of the inadequacy of the soil moisture sensor calibrations. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1997-06-18 | 01:30:00 | 1997-06-18 | 02:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Character In EBBR E26, 30 Minute Data |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | A non-numeric character appears in the field for shf1 in the 30 minute data file at the time shown. Data processing programs that assume that a numeric character is there will display an error condition. I had to create a short routine to put in my analysis program to avoid using that data point. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-09-12 | 00:00:00 | 1995-10-13 | 12:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Net Radiometer Dome Punctured |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The upper dome of the net radiometer was punctured sometime between the PM visits of September 12 and 26, 1995. After the puncture, water collected in the top hemisphere. The water was removed on September 26, but a replacement dome was not available. The dome was replaced during the PM visit on October 13, 1995. The puncture and water did not result in obviously incorrect data. I cannot tell when the puncture occurred from the data. The data, particularly during the two weeks between September 12 and 26, 1995, should be considered suspect. Suspect net radiation data results in the latent heat flux and sensible heat flux also being suspect. Suspect data then includes: 5 minute: q 15 minute: mv_q 30 minute: q, e, h. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-03-06 | 22:05:00 | 1995-03-07 | 22:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Frozen Wind Speed Sensor |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | On March 6, 1995 freezing rain stopped the cups of the EBBR wind speed instrument at Cement, OK (E26). All 5, 15, and 30 minute data values indicated below are incorrect for the period listed. 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-11-01 | 08:45:00 | 2002-11-06 | 01:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Battery Voltage Low |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | When Battery Voltage drops below 10.5 volts, most measurements are suspect and some are often incorrect. The user will need to inspect the data carefully to determine the useability of the data. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1993-12-01 | 00:00:00 | 1994-02-02 | 23:59:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Winds, SM2 Invalid data 10/10/93 - 2/2/94 |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Beginning October 10, 1993 the EBBR system at E26, Cement, OK began to have problems with outputs from soil moisture sensor number 2 and the wind direction sensor. This situation also occured in early 1993 and was eliminated by replacing the soil moisture sensor (after replacing the wind direction sensor did not help). This time, replacing the soil moisture sensor did not help, but the problem has not re-occured since the wind direction sensor was replaced on February 2, 1994. During periods of bad data the wind direction output is a constant 135 degrees and soil moisture two is offscale. Invalid data for a constant wind direction of 135 degrees is: 30 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_d 5 minute: res_ws, wind_d, sigma_wd. Invalid data for soil moisture 2 offscale is: 30 minute: sm2, c_shf2, cs2, ces2, g2, ave_shf, h, e 15 minute: r_sm2 5 minute: no data affected. Apparent cause of data loss, if known: Apparently an electronic problem in interfacing an intermittently malfunctioning wind direction sensor to the data acquisition system multiplexer, thereby affecting the other sensor (soil moisture 2) on that multiplexer pair. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-10-13 | 00:00:00 | 2005-07-22 | 23:59:00 | Note |
| Subject: | SGP/EBBR/E26 - metadata corrections |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | On 20050723, a series of metadata corrections and additions were completed. These metadata changes apply to all EBBR.E26 data collected by ARM back to the installation of the instrument in June 1992. Please see the current metadata for correct information. These changes do not affect data values or quality. The changes are summarized below: 1) Update of "sensor location" information 2) Addition of installation dates for the systems 3) Correction of soil moisture units (from "by volume" to "gravimetric") |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-08-27 | 08:30:00 | 2002-09-05 | 17:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Water in broken Net Radiometer Dome |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | The net radiation measurement is incorrect. Measurements calculated using net radiation are also incorrect. No work-around is possible for this situation. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-11-30 | 16:00:00 | 2000-12-03 | 07:31:00 | Incorrect |
| 2000-12-14 | 16:00:00 | 2000-12-16 | 03:01:00 | Incorrect |
| 2000-11-05 | 19:00:00 | 2000-11-16 | 16:01:00 | Incorrect |
| 2000-06-15 | 15:00:00 | 2000-06-19 | 22:01:00 | Incorrect |
| Subject: | SGP EBBR E26 - Soil Heat Flow #3 Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Soil heat Flow #3 was incorrect (large negative). Therefore average soil heat flow, sensible heat flux, and latent heat flux were also incorrect; these can be re-calculated using the remaining correct soil heat flows. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2000-03-24 | 01:00:00 | 2000-04-06 | 17:30:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Electronics Problem |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Incorrect home signal indicates an electronic problem that affected the indicated measurements; this may have been a multiplexer #2 problem as all sensors affected are connected to that multiplexer and no sensors on multiplexer #1 were affected. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-06-11 | 00:00:00 | 1999-06-29 | 21:45:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Left T/RH Probe Temperature Data Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | Left T/RH probe temperature is frequently offscale during the period. Examine the data (compare with the the T/RH right temperature) to determine which times are incorrect. Replacement of the probe on 29 June 1999 solved the problem. Affected data are: 5 minute: tair_bot, tair_top 15 minute: tair_l 30 minute: tair_bot, tair_top, e, h, bowen |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-03-19 | 19:05:00 | 1995-04-12 | 14:30:00 | Incorrect |
| 1995-03-17 | 20:00:00 | 1995-03-19 | 05:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Frozen Wind Speed Sensor |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | A broken lead on the EBBR wind speed instrument cable at Cement, OK (E26) resulted in the loss of wind speed data. It was nearly a month before the cable could be repaired and reinstalled. All 5, 15, and 30 minute data values indicated below are incorrect for the periods listed above. 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1997-10-21 | 21:25:00 | 1997-10-21 | 21:48:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - 3-Month Check |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | During EBBR 3 month checks the Automatic Exchange Mechanism is disabled (reflected by home signals near zero) so that the two aspirator units can be placed at the same height. The measurements during these periods do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), or latent heat flux (e), nor do the air temperature and relative humidity measurements indicate correct gradients. Checks performed before or after the AEM is disabled also lead to some incorrect data. Incorrect 5, 15 minute and half hour data occurs for the period indicated. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1996-11-06 | 20:00:00 | 1996-11-19 | 18:25:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Wind Direction Sensor Failure |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | Wind Direction and Sigma of Wind Direction data for the period listed is incorrect. The wind direction sensor began to malfunction on 6 November, with the characteristic constant 135 degree output. At other times the output remained a nearly constant 230 to 240 degrees. On 16 November at 1819 GMT site operations replaced sensor S/N 3033 with S/N 3036. Apparently they left it aligned at north when they left the EF; output for the next few days was 0 or 360 degrees, until they returned on 19 November at 1825 GMT and gave the vane it's freedom. Affected fields are: 5 minute: wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1995-08-26 | 03:45:00 | 1995-09-12 | 20:00:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - AEM not exchanging |
|---|---|
| Affected Datastreams: | sgp5ebbrE26.b1 |
| Description | On August 26, 1995 at approximately 0345 GMT the gears on the lower sprocket shaft of the AEM appear to have been damaged, causing the AEM to stop exchanging. The home signal values then remained at around -0.5 for both home_15 and Home_30. On August 29 site operations personnel removed the fuse (to prevent exchange) with the left aspirator in the down position. The AEM will remain in this condition until a replacement is available. Therefore, the calculations of Bowen ratio, latent heat flux, and sensible heat flux are incorrect for all times after August 26, 1995 at 0345 GMT. The data fields listed below are incorrect after this time: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, Bowen, e, h. It is not possible to reliably calculate the Bowen ratio, e, and h using the 15 minute data. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-10-13 | 00:00:00 | 2004-09-29 | 18:45:00 | Incorrect |
| Subject: | SGP/EBBR/E26 - Spark Gap Bad, Pressure Incorrect |
|---|---|
| Affected Datastreams: | sgp30ebbrE26.b1 |
| Description | In a trip to E26, I found that a bad spark gap through which the barometer was powered was causing pressure measurements to be incorrect. The pressure readings oscillated with the voltage of the EBBR battery. During daytime the voltage and thus the pressure would increase and vice versa during dark hours. Apparently only the positive side of the power supply was properly connected through the spark gap and thus the voltage received by the pressure sensor was lower than required to power it properly. Under this condition the perssure measurement varies with voltage level. The pressure measurements therefore had a diurnal signature and usually were incorrect. The decreased pressure during most times would cause latent heat flux to be slightly overestimated and sensible heat flux to be slightly underestimated. |
| Measurements |
|