| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000211.4 | SGP/EBBR - EBBR E4 Data Incorrect When Batt. Volt. Under 10.4 V | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D000221.1 | SGP/EBBR - EBBR E4 Soil Heat Flux Values Too Large | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D010102.10 | SGP/EBBR/E4 - E4 Negative SM5 Causes Incorrect Measurements | sgp30ebbrE4.b1 |
| D010102.11 | SGP/EBBR/E4 - E4 SHF3 Large Negative | sgp30ebbrE4.b1 |
| D010102.2 | SGP/EBBR/E4 - Missing Data | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D010102.5 | SGP/EBBR/E4 - Data Missing | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D010102.7 | SGP/EBBR/E4 - E4 Incorrect Data, AEM Stuck | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D010102.8 | SGP/EBBR/E4 - E4 Data Incorrect | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D010102.9 | SGP/EBBR/E4 - E4 SM5 Drifting | sgp30ebbrE4.b1 |
| D010213.14 | SGP/EBBR/E4 - EBBR E4 Wind Speed Iced | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| D010605.1 | SGP EBBR E4 - E4 EBBR Soil Heat Flow #3 Incorrect | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D010605.3 | SGP EBBR E4 - E4 EBBR Data Incorrect | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| D010723.1 | SGP EBBR E4 - E4 EBBR Data Incorrect | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D011127.22 | SGP EBBR E4 - E4 EBBR Data Incorrect During 6 Month Checks | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D011129.1 | SGP EBBR E4 - E4 EBBR Data Incorrect | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| D020628.10 | SGP/EBBR/E4 - T/RH Check | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D020628.7 | SGP/EBBR/E4 - 3-month Check | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D020701.1 | SGP/EBBR/E4 - Reprocess: Soil Temperature Malfunction | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D020701.2 | SGP/EBBR/E4 - Reprocess: Bad soil heat flux sensor #4 | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D020701.3 | SGP/EBBR/E4 - Reprocess: Bad soil heat flux sensor #5 | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D020701.4 | SGP/EBBR/E4 - Soil Moisture Probe 5 Offscale | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D020716.24 | SGP/EBBR/E4 - AEM Hung | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| D020716.25 | SGP/EBBR/E4 - Data Incorrect or Zero | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp5ebbrE4.00 |
| D020716.7 | SGP/EBBR/E4 - 6 Month Checks | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| D021113.1 | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header | sgp30ebbrE9.b1, sgp30ebbrE8.b1, sgp30ebbrE22.b1, sgp30ebbrE20.b1, sgp30ebbrE4.b1, sgp30ebbrE12.b1, sgp30ebbrE13.b1, sgp30ebbrE15.b1, sgp30ebbrE18.b1, sgp30ebbrE19.b1, sgp30ebbrE2.b1, sgp30ebbrE26.b1, sgp30ebbrE7.b1 |
| D021113.4 | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header | sgp30ebbrE12.b1, sgp30ebbrE13.b1, sgp30ebbrE15.b1, sgp30ebbrE20.b1, sgp30ebbrE22.b1, sgp30ebbrE26.b1, sgp30ebbrE4.b1, sgp30ebbrE7.b1, sgp30ebbrE8.b1, sgp30ebbrE9.b1 |
| D030110.29 | SGP/EBBR/E4 - Data Incorrect during 6 month checks | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| D030117.31 | SGP/EBBR/E4 - Wind Speed Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D030117.32 | SGP/EBBR/E4 - Soil Moisture #4 zero | sgp30ebbrE4.b1 |
| D030712.10 | SGP/EBBR/E4 - Soil Temperature #5 Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D030712.12 | SGP/EBBR/E4 - 6 Month Checks | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D031204.5 | SGP/EBBR/E4 - 6 Month Checks | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| D031222.23 | SGP/EBBR/E4 - Wind Speed Sensor Frozen By Ice Storm | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D040304.23 | SGP/EBBR/E4 - Wind Speed Frozen Stopped By Ice | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D040304.24 | SGP/EBBR/E4 - Wind Direction Frozen Stopped By Ice | sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D040813.4 | SGP/EBBR/E4 - Net Radiation Incorrect, Sensible and Latent Heat Fluxes Incorrect | sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D041222.7 | SGP/EBBR/E4 - 6 Month Checks | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D050206.5 | SGP/EBBR/E4 - Wind Speed Frozen Stopped By Ice Storm | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D050207.2 | SGP/EBBR/E4 - Wind Direction Frozen Stopped By Ice Storm | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D050215.10 | SGP/EBBR/E4 - Wind Direction Frozen Stopped By Ice | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D050215.9 | SGP/EBBR/E4 - Wind Speed Frozen Stopped By Ice | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D050303.4 | SGP/EBBR/E4 - Wind Speed and Direction Frozen by Ice Storm | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D050404.2 | SGP/EBBR/E4 - Soil Temperature #5 Spiking Upwards | sgp30ebbrE4.b1 |
| D050602.2 | SGP/EBBR/E4 - Water in Net Radiometer | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D050624.1 | SGP/EBBR/E4 - All Measurements Incorrect Due to Low Battery Voltage | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D050719.5 | SGP/EBBR/E4 - Improved EBBR CR10 Program | sgp30ebbrE4.b1 |
| D051106.19 | SGP/EBBR/E4 - Average Soil Heat Flux Incorrect | sgp30ebbrE4.b1 |
| D051112.3 | SGP/EBBR/E4 - metadata corrections | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D051215.1 | SGP/EBBR/E4 - Net Radiation, Sensible and Latent Heat Fluxes Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D060111.2 | SGP/EBBR/E4 - Sensible and Latent Heat Fluxes Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D060501.3 | SGP/EBBR/E4 - Wind Speed Sensor Frozen Stopped | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D060926.2 | SGP/EBBR/E4 - Soil Heat Flow #2 Incorrect at times | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D061220.2 | SGP/EBBR/E4 - Wind Direction Dependency of Surface Fluxes and General Data Quality Information | sgp30ebbrE4.b1 |
| D070328.1 | SGP/EBBR/E4 - Wind Direction Stuck at Zero | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D070508.1 | SGP/EBBR/E4 - Instrument problem | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D070810.1 | SGP/EBBR/E4 - Wind Direction Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D080413.1 | SGP/EBBR/E4 - AEM Blown Fuse, Sensible and Latent Heat Fluxes Incorrect | sgp30ebbrE4.b1 |
| D080509.2 | SGP/EBBR/E4 - Reprocess: Wind Direction Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D081110.1 | SGP/EBBR/E4 - Wind Direction 20 Degrees Low | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D090313.10 | SGP/EBBR/E4 - Wind Speed Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D090821.1 | SGP/EBBR/E4 - Wind direction sensor failure | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D100225.1 | SGP/EBBR/E4 - Wind Speed Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D100521.1 | SGP/EBBR/E4 - Net Radiometer Dome Broken | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D931108.5 | SGP/EBBR/E4 - Reprocess: Intermittently bad soil heat flux sensor #4 | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D931115.2 | SGP/EBBR/E4 - AEM malfunction | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D940106.3 | SGP/EBBR/E4 - Invalid data during E4 battery exchange | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D940106.4 | SGP/EBBR/E4 - Invalid data due to AEM not exchanging | sgp30ebbrE4.b1 |
| D940301.1 | SGP/EBBR/E4 - Invalid data during shutdown for PM on 2/10/94 | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D940301.5 | SGP/EBBR/E4 - Invalid wind speed frozen sensor | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D940329.4 | SGP/EBBR/E4 - Improper Net Radiometer Calibration | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D940607.1 | SGP/EBBR/E4 - Soil Heat Flux Plate #5 | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D940707.1 | SGP/EBBR/E4 - Pressure | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D940720.1 | SGP/EBBR/E4 - Wind Direction Sensor Malfunction | sgp30ebbrE4.b1, sgp15ebbrE4.b1, sgp5ebbrE4.b1 |
| D941212.2 | SGP/EBBR/E4 - Frozen Wind Instruments | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D950308.4 | SGP/EBBR/E4 - Frozen Wind Speed Sensor | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D950803.1 | SGP/EBBR/E4 - Reprocess: Soil Temperature Malfunction | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D951113.5 | SGP/EBBR/E4 - Annual calibration changeout | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D951114.1 | SGP/EBBR/E4 - Soil Moisture Sensor Offscale | sgp30ebbrE4.b1 |
| D951127.2 | SGP/EBBR/E4 - Soil Moisture Probe 1 Offscale | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D951207.1 | SGP/EBBR/E4 - Battery change | sgp5ebbrE4.b1, sgp30ebbrE4.b1 |
| D960104.6 | SGP/EBBR/E4 - Wind Speed Cups Frozen | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| D960119.4 | SGP/EBBR/E4 - Soil Moisture Probes Offscale | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D960508.1 | SGP/EBBR/E4 - 3-month check | sgp5ebbrE4.b1, sgp30ebbrE4.b1 |
| D961122.16 | SGP/EBBR/E4 - Cups Missing From Anemometer | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| D961122.18 | SGP/EBBR/E4 - Reprocess: Soil Moisture Probe Low at Times | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D961122.19 | SGP/EBBR/E4 - EBBR 3 Month Checks - 10 EFs | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D970330.3 | SGP/EBBR/E4 - Wind Speed Cups Frozen | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| D970616.2 | SGP/EBBR/E4 - Soil Moisture Sensor Offscale | sgp30ebbrE4.b1 |
| D971021.11 | SGP/EBBR/E4 - EBBR Biannual Checks | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D980117.12 | SGP/EBBR/E4 - EBBR Frozen Wind Speed | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D980117.30 | SGP/EBBR/E4 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D980413.4 | SGP/EBBR/E4 - EBBR E4 Low Battery - Resulting In Incorrect Data | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D980416.35 | SGP/EBBR/E4 - EBBR E4 Wind Speed Frozen | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| D980416.7 | SGP/EBBR/E4 - EBBR E4 3-Month Check | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D980514.2 | SGP/EBBR/E4 - EBBR E4 Low Battery Voltage | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D980529.5 | SGP/EBBR/E4 - EBBR E4 6-Month Checks | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| D980625.1 | SGP/EBBR/E4 - Reprocess: E4 EBBR Soil Moisture #5 Offscale In Dry Conditions | sgp30ebbrE4.b1 |
| D980625.2 | SGP/EBBR/E4 - EBBR E4 Data Missing | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| D990127.3 | SGP/EBBR/E4 - EBBR E4 Battery Voltage Low, Data Incorrect | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| D990127.5 | SGP/EBBR/E4 - EBBR E4 Battery Voltage Low, Data Incorrect (Corrected begin date) | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| D990127.6 | SGP/EBBR/E4 - EBBR E4 Battery Voltage Low, Data Incorrect | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| D990127.9 | SGP/EBBR/E4 - EBBR E4 Water In Net Radiometer, Flux Data Incorrect | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1, sgp5ebbrE4.00 |
| D990128.9 | SGP/EBBR/E4 - EBBR E4 Wind Speed Data Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp5ebbrE4.00 |
| D990129.6 | SGP/EBBR/E4 - EBBR E4 Battery Voltage Low | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| D990129.7 | SGP/EBBR/E4 - EBBR E4 Data Missing/Incorrect | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| D990202.2 | SGP/EBBR/E4 - EBBR E4 Wind Speed Iced, Data Incorrect | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp5ebbrE4.00 |
| D990218.1 | SGP/EBBR/E4 - E4 EBBR Battery Voltage Low | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/08/1998 | 0445 | 09/01/1999 | 1500 |
| Subject: | SGP/EBBR - EBBR E4 Data Incorrect When Batt. Volt. Under 10.4 V |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | All data was incorrect when the battery voltage dropped below 10.4 volts. An old battery was the cause of the problem; it had no deep cycle charge capacity. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/17/1999 | 0100 | 07/17/1999 | 0115 |
| Subject: | SGP/EBBR - EBBR E4 Soil Heat Flux Values Too Large |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | Soil Heat flux from probes #1 and #4 are incorrect for the period. The flux values output were larger than what could be considered reasonable, for unknown reasons. The following values were therefore incorrect as a result: 15 minute: mv_hft1, mv_hft4 30 minute: shf1, shf4, c_shf1, c_shf4, g1, g4, ave_shf, e, h |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/16/2000 | 0015 | 07/17/2000 | 0530 |
| Subject: | SGP/EBBR/E4 - E4 Negative SM5 Causes Incorrect Measurements |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | Negative soil moisture #5 caused the indicated measurements to be incorrect. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/10/2000 | 0700 | 12/12/2000 | 0730 |
| Subject: | SGP/EBBR/E4 - E4 SHF3 Large Negative |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | Soil Heat Flow #3 became large negative, causing the indicated measurements to be incorrect. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/01/2000 | 1540 | 03/01/2000 | 1630 |
| Subject: | SGP/EBBR/E4 - Missing Data |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | Data was missing because of AEM check and EBBR program reload. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/07/2000 | 1710 | 08/07/2000 | 1930 |
| Subject: | SGP/EBBR/E4 - Data Missing |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | Data was missing during the six month calibration |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/16/2000 | 1700 | 03/29/2000 | 1545 |
| Subject: | SGP/EBBR/E4 - E4 Incorrect Data, AEM Stuck |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | During the period stated, the AEM was stuck in one position. The indicated measurements are incorrect because of this. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/07/2000 | 1930 | 08/07/2000 | 2000 |
| Subject: | SGP/EBBR/E4 - E4 Data Incorrect |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | The indicated data are incorrect, cause unknown. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/13/2000 | 0200 | 07/16/2000 | 0000 |
| Subject: | SGP/EBBR/E4 - E4 SM5 Drifting |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | The Soil moisture #5 was drifting around during this period and is characterized as suspect. The drifting was not so much as to affect soil, sensible, and latent heat fluxes. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/11/2000 | 0145 | 12/11/2000 | 2215 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Wind Speed Iced |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | The anemometer was frozen stopped by freezing rain. Indicated data was incorrect. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/08/2001 | 0130 | 03/14/2001 | 1601 |
| Subject: | SGP EBBR E4 - E4 EBBR Soil Heat Flow #3 Incorrect |
| DataStreams: | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | SHF #3 was large negative most of the time during the period indicated. Average soil heat flow, sensible heat flux, and latent heat flux are therefore incorrect. |
| Measurements: | sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/14/2001 | 1700 | 03/14/2001 | 1701 |
| Subject: | SGP EBBR E4 - E4 EBBR Data Incorrect |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| Description: | Re-loading the datalogger program caused all values to be incorrect; the time interval of the measurements is not correct, so the data is incorrect as well. |
| Measurements: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/01/2000 | 1630 | 03/01/2000 | 1635 |
| Subject: | SGP EBBR E4 - E4 EBBR Data Incorrect |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | The data was incorrect for the first time period after the datalogger program was reloaded. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/07/2001 | 1520 | 11/07/2001 | 1600 |
| 04/25/2001 | 1415 | 04/25/2001 | 1446 |
| Subject: | SGP EBBR E4 - E4 EBBR Data Incorrect During 6 Month Checks |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | The data was incorrect during the 6 month checks. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/25/2001 | 1500 | 04/25/2001 | 1501 |
| Subject: | SGP EBBR E4 - E4 EBBR Data Incorrect |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| Description: | The data was incorrect immediately after 6 month checks were completed. |
| Measurements: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/03/1994 | 1620 | 11/03/1994 | 1800 |
| Subject: | SGP/EBBR/E4 - T/RH Check |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.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: 1620, 1625, 1630, 1635, 1640, 1645, 1650, 1655, 1700,
1705, 1710, 1715, 1720, 1725, 1730, 1735, 1740
15 minute: 1630, 1645, 1700, 1715, 1730, 1745
30 minute: 1630, 1700, 1730, 1800
(EDITORS 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: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/03/1995 | 1600 | 10/03/1995 | 1900 |
| Subject: | SGP/EBBR/E4 - 3-month Check |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.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: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/20/1995 | 1731 | 07/20/1995 | 1800 |
| 07/22/1995 | 1731 | 07/22/1995 | 1800 |
| 07/21/1995 | 0731 | 07/21/1995 | 0800 |
| Subject: | SGP/EBBR/E4 - Reprocess: Soil Temperature Malfunction |
| DataStreams: | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | During individual half hours on three days, soil moisture probe #1 indicated values that were below the acceptable minimum, for unknown reasons. The times of incorrect data and the affected quantities are shown below. SM1: Half Hour 15 Minute 20 July: 1800 GMT 1745, 1800 GMT 21 July: 0800 GMT 0745, 0800 GMT 22 July: 1800 GMT 1745, 1800 GMT 15 minute: r_sm1 30 minute: sm1, c_shf1, cs1, ces1, g1, ave_shf, e, h |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/11/1993 | 1700 | 09/23/1993 | 1600 |
| Subject: | SGP/EBBR/E4 - Reprocess: Bad soil heat flux sensor #4 |
| DataStreams: | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | On September 11, 1993 soil heat flux sensor #4 of the Plevna, KS EBBR (E4) malfunctioned. The sensor was replaced September 23, 1993 before 1600. Corrupted 30 minute values of shf4, c_shf4, g4, ave_shf, h, and e, and corrupted 15 minute values of mv_hft4 resulted from the sensor malfunction. The quantities shf4, c_shf4, g4, and mv_hft4 are bad data values and are not recoverable. The other quantities can be recalculated using the three functioning sets of soil sensors. (Note: Soil heat flux sensor #5 was also malfunctioning during the time periods identified and has therefore been eliminated from the recalculation equations. This problem is identified in a separate DQR.) ave_shf = (g1 + g2 + g3)/3 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/01/1993 | 0000 | 11/04/1993 | 1900 |
| Subject: | SGP/EBBR/E4 - Reprocess: Bad soil heat flux sensor #5 |
| DataStreams: | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | On September 1, 1993 the EBBR system at Plevna, E4, was relocated in the same field. However, soil contact for soil heat flux plate #5 was not properly established. This resulted in somewhat high positive and very high negative outputs, depending on the direction of soil heat flow. Corrupted 30 minute values of shf4, c_shf4, g4, ave_shf, h, and e, and corrupted 15 minute values of mv_hft4 resulted. The quantities shf4, c_shf4, g4, and mv_hft4 are bad data values and are not recoverable. The other quantities can be recalculated using the four functioning sets of soil sensors. (Note: Soil heat flux sensor #4 was also malfunctioning during part of the time period identified. That problem is identified in two separate DQRs. See D931108.5 and D020701.2 for the equations to use while sensor #4 was not working properly) ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/19/1995 | 2301 | 11/19/1995 | 2330 |
| 11/15/1995 | 1101 | 11/15/1995 | 1130 |
| Subject: | SGP/EBBR/E4 - Soil Moisture Probe 5 Offscale |
| DataStreams: | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | During two half hours, soil moisture probe #5 indicated values that were offscale for an unknown reasons. Affected data values are: 15 minute: rr_sm5 30 minute: sm1, c_shf5, cs5, ces5, g5, ave_shf, e, h Sensible, latent, and soil heat fluxes can be recalculated using the change in energy storage of probes 1-4 as follows. ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf +q) |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/07/2002 | 1400 | 02/13/2002 | 1531 |
| 03/26/2002 | 0130 | 06/05/2002 | 1501 |
| Subject: | SGP/EBBR/E4 - AEM Hung |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/19/2002 | 1500 | 06/19/2002 | 1631 |
| Subject: | SGP/EBBR/E4 - Data Incorrect or Zero |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp5ebbrE4.00 |
| Description: | After the barometer was changed out, the measurements were zero or otherwise incorrect. |
| Measurements: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/22/2002 | 1500 | 05/22/2002 | 1531 |
| Subject: | SGP/EBBR/E4 - 6 Month Checks |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | The indicated measurements were incorrect during the six month checks. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/01/2001 | 0000 | 06/18/2003 | 2359 |
| Subject: | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR |
| DataStreams: | sgp30ebbrE9.b1, sgp30ebbrE8.b1, sgp30ebbrE22.b1, sgp30ebbrE20.b1, sgp30ebbrE4.b1, sgp30ebbrE12.b1, sgp30ebbrE13.b1, sgp30ebbrE15.b1, sgp30ebbrE18.b1, sgp30ebbrE19.b1, sgp30ebbrE2.b1, sgp30ebbrE26.b1, sgp30ebbrE7.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: | sgp30ebbrE2.b1:
sgp30ebbrE26.b1:
sgp30ebbrE9.b1:
sgp30ebbrE22.b1:
sgp30ebbrE13.b1:
sgp30ebbrE7.b1:
sgp30ebbrE18.b1:
sgp30ebbrE12.b1:
sgp30ebbrE4.b1:
sgp30ebbrE15.b1:
sgp30ebbrE19.b1:
sgp30ebbrE20.b1:
sgp30ebbrE8.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/1993 | 1200 | 06/18/2003 | 1159 |
| Subject: | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR |
| DataStreams: | sgp30ebbrE12.b1, sgp30ebbrE13.b1, sgp30ebbrE15.b1, sgp30ebbrE20.b1, sgp30ebbrE22.b1, sgp30ebbrE26.b1, sgp30ebbrE4.b1, sgp30ebbrE7.b1, sgp30ebbrE8.b1, 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. (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: | sgp30ebbrE26.b1:
sgp30ebbrE9.b1:
sgp30ebbrE7.b1:
sgp30ebbrE4.b1:
sgp30ebbrE12.b1:
sgp30ebbrE15.b1:
sgp30ebbrE22.b1:
sgp30ebbrE13.b1:
sgp30ebbrE8.b1:
sgp30ebbrE20.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/06/2002 | 1700 | 11/06/2002 | 1730 |
| Subject: | SGP/EBBR/E4 - Data Incorrect during 6 month checks |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | Some of the measurements are incorrect during the 6 month checks. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/24/2002 | 0735 | 10/24/2002 | 1830 |
| Subject: | SGP/EBBR/E4 - Wind Speed Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The wind speed sensor was frozen stopped by ice. The wind speed and residual wind speed measurements are incorrect. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/07/2002 | 0300 | 08/07/2002 | 0329 |
| Subject: | SGP/EBBR/E4 - Soil Moisture #4 zero |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | Soil Moisture #4 was zero only in the 30 minute data. It can be assumed that there was an error in reading the data from the Campbell datalogger, as no other measurements, including those calculated from soil moisture #4, are affected. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/01/2003 | 0000 | 02/06/2003 | 0830 |
| 02/14/2003 | 2330 | 02/05/2003 | 1100 |
| 02/22/2003 | 0000 | 02/23/2003 | 0700 |
| Subject: | SGP/EBBR/E4 - Soil Temperature #5 Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | Soil Temperature #5 was incorrect. This affected many measurements, including sensible and latent heat fluxes. |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/07/2003 | 1630 | 05/07/2003 | 1700 |
| Subject: | SGP/EBBR/E4 - 6 Month Checks |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | Many measurements were incorrect while the AEM was positioned with both aspirators at the same height for comparison checks. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/08/2003 | 1530 | 10/08/2003 | 1645 |
| Subject: | SGP/EBBR/E4 - 6 Month Checks |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | Many measurements were incorrect while the AEM was positioned with both aspirators at the same height for comparison checks. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/09/2003 | 1335 | 12/10/2003 | 1710 |
| Subject: | SGP/EBBR/E4 - Wind Speed Sensor Frozen By Ice Storm |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.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: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/26/2004 | 0110 | 01/27/2004 | 2135 |
| 02/01/2004 | 0000 | 02/04/2004 | 1430 |
| Subject: | SGP/EBBR/E4 - Wind Speed Frozen Stopped By Ice |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | An ice storm froze the wind speed sensor to a stopped condition. The wind speed and residual wind speed measurements are incorrect. This sensor failure does not affect the sensible and latent heat fluxes. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/27/2004 | 1125 | 01/27/2004 | 1850 |
| Subject: | SGP/EBBR/E4 - Wind Direction Frozen Stopped By Ice |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.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: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/25/2004 | 1200 | 07/28/2004 | 1500 |
| Subject: | SGP/EBBR/E4 - Net Radiation Incorrect, Sensible and Latent Heat Fluxes Incorrect |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The Net Radiometer domes were broken and rain entered, causing net radiation values to be too large during the period. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/20/2004 | 1600 | 10/20/2004 | 1630 |
| Subject: | SGP/EBBR/E4 - 6 Month Checks |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | Many measurements were incorrect while the AEM was positioned with both aspirators at the same height for comparison checks. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/03/2005 | 0635 | 01/05/2005 | 0200 |
| Subject: | SGP/EBBR/E4 - Wind Speed Frozen Stopped By Ice Storm |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | An ice storm froze the wind speed sensor to a stopped condition. The wind speed and residual wind speed measurements are incorrect. This sensor failure does not affect the sensible and latent heat fluxes. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/03/2005 | 0845 | 01/05/2005 | 0200 |
| Subject: | SGP/EBBR/E4 - Wind Direction Frozen Stopped By Ice Storm |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.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: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/09/2005 | 1230 | 02/09/2005 | 1600 |
| Subject: | SGP/EBBR/E4 - Wind Direction Frozen Stopped By Ice |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.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: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/12/2005 | 1330 | 01/12/2005 | 1715 |
| 02/07/2005 | 0300 | 02/09/2005 | 1630 |
| Subject: | SGP/EBBR/E4 - Wind Speed Frozen Stopped By Ice |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | An ice storm froze the wind speed sensor to a stopped condition. The wind speed and residual wind speed measurements are incorrect. This sensor failure does not affect the sensible and latent heat fluxes. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/24/2005 | 0105 | 02/24/2005 | 1500 |
| Subject: | SGP/EBBR/E4 - Wind Speed and Direction Frozen by Ice Storm |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The wind speed and direction sensors were frozen during an ice storm on 2/24/05. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/20/2005 | 2100 | 03/27/2005 | 1500 |
| Subject: | SGP/EBBR/E4 - Soil Temperature #5 Spiking Upwards |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | Soil temperature #5 experienced some erratic behavior during nighttime, spiking upwards slightly at times (mouse activity?). This caused soil moisture #5 to be corrected downwards very slightly. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/24/2005 | 0830 | 06/01/2005 | 1600 |
| Subject: | SGP/EBBR/E4 - Water in Net Radiometer |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | The net radiometer had water in the bottom dome. All net radiation, sensible heat flux, and latent heat flux data during this period is incorrect. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/13/2005 | 1130 | 05/13/2005 | 1930 |
| Subject: | SGP/EBBR/E4 - All Measurements Incorrect Due to Low Battery Voltage |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | All measurements were incorrect as battery voltage fell below the level that is required to ensure correct data values. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/01/2001 | 0000 | 03/23/2005 | 1800 |
| Subject: | SGP/EBBR/E4 - Improved EBBR CR10 Program |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | Effective 20050323.1800, the EBBR.E4 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 20050323, 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 sgp30ebbrE4.b1 data stream. The earlier version of the CR10 program was also used on previous EBBR datastream names (e.g. sgp30ebbrE4.a1). |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/09/2005 | 1730 | 03/23/2005 | 1800 |
| Subject: | SGP/EBBR/E4 - Average Soil Heat Flux Incorrect |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | A typo in the version 9 EBBR program caused average soil heat flow to be zero, resulting in both sensible and latent heat fluxes being approximately 20 watts per meter squared too large during the middle of the day. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/14/2003 | 0000 | 08/16/2005 | 2359 |
| Subject: | SGP/EBBR/E4 - metadata corrections |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | On 20050817, a series of metadata corrections and additions were completed. These metadata changes apply to all EBBR.E4 data collected by ARM back to the installation of the instrument in April 1993. 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: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/20/2005 | 1315 | 11/02/2005 | 0330 |
| Subject: | SGP/EBBR/E4 - Net Radiation, Sensible and Latent Heat Fluxes Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The top dome of the net radiometer was broken, resulting in net radiations that were too small, and thus sensible and latent heat fluxes that were too small. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/18/2005 | 0400 | 12/28/2005 | 1630 |
| Subject: | SGP/EBBR/E4 - Sensible and Latent Heat Fluxes Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The AEM hung at one position for an extended period, causing sensible and latent heat fluxes and gradient measurements to be incorrect. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/20/2006 | 1300 | 03/20/2006 | 1630 |
| 03/21/2006 | 0530 | 03/21/2006 | 1530 |
| Subject: | SGP/EBBR/E4 - Wind Speed Sensor Frozen Stopped |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | Freezing rain froze the Wind Speed sensor to a stopped condition. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/19/2006 | 1700 | 11/01/2006 | 1830 |
| Subject: | SGP/EBBR/E4 - Soil Heat Flow #2 Incorrect at times |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | Soil Heat Flow #2 sometimes dropped to large negative values during daytime. |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/13/1993 | 1030 | 10/09/2003 | 2330 |
| Subject: | SGP/EBBR/E4 - Wind Direction Dependency of Surface Fluxes and General Data Quality |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | Beginning in FY2006, Data Quality Reports are not written for missing data or for situations when qc flags clearly show that the data is incorrect (this is true for most of the conditions listed below). DQRs are written for periods when data is incorrect, when the situation is not represented by qc flags in the data, and it's not obvious that the data should have been flagged as incorrect. The EBBR data is only useful for particular wind directions at each Extended Facility. Please use the following resources to help in interpreting the EBBR data. 1) qc flags in the EBBR data. 2) Instrument Mentor Monthly Summaries (IMMS) at http://www.db.arm.gov/IMMS/ 3) SGP EF Surface Conditions Observations (EFSCO) at http://198.124.96.210:591/sfc_cond1/default.htm 4) Surface fluxes are valid only for the following wind directions (in degrees): 0-158, 202-360 Note that there are wind directions at most sites for which the fetch is insufficient and therefore EBBR data is invalid. Appropriate fetch was determined from a 1/40 measurement height to fetch ratio, resulting in a required minimum fetch of 120 m. Particular attention should be paid to the limited valid wind directions for the Central Facility EBBR. The surface vegetation type for the EBBRs is grazed or ungrazed grassland (refer to the EFSCO for state). 5) Some conditions that commonly cause the EBBR primary measurements to be incorrect or missing follow: a) Sensible and latent heat fluxes are not accurate during times when the Automatic Exchange Mechanism (AEM) is not functioning properly. The AEM switches the gradient measuring instrumentation between the top and bottom positions every 15 minutes; this reduces the effects of instrument offsets. Sometimes the AEM does not reach it's full extent of travel, resulting in the home signal being zero. b) Sensible and latent heat fluxes are sometimes incorrect when surface soil heat flow is out of range, as seen in the average soil heat flux (ave_shf). c) Very light winds may be seen at nights for brief periods. Wind direction flops around a lot during low wind conditions (< 1.5 m/s) and is often unreliable during those periods. d) Missing data periods occur at times; this is usually a site data system collection/communication problem; it can also occur during replacement of the system with a newly calibrated unit. Missing data is sometimes filled in later from manual or automatic re-collection of the data. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/24/2007 | 0100 | 03/26/2007 | 1700 |
| Subject: | SGP/EBBR/E4 - Wind Direction Stuck at Zero |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The wind direction sensor was stuck at zero. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/06/2007 | 1630 | 05/16/2007 | 1840 |
| Subject: | SGP/EBBR/E4 - Instrument problem |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | Wind direction was flat lining near zero and incorrect. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/09/2007 | 0230 | 08/24/2007 | 1930 |
| Subject: | SGP/EBBR/E4 - Wind Direction Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The EBBR wind direction sat at about 60 degrees from 08/09 0230 GMT through 08/24 1930 GMT and was incorrect. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/02/2008 | 2000 | 05/15/2008 | 1700 |
| 05/16/2008 | 0300 | 05/29/2008 | 1730 |
| Subject: | SGP/EBBR/E4 - AEM Blown Fuse, Sensible and Latent Heat Fluxes Incorrect |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | The AEM Fuse was blown, the AEM was not switching, and thus sensible and latent heat flux measurements were incorrect. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/24/2007 | 2000 | 09/05/2007 | 1630 |
| Subject: | SGP/EBBR/E4 - Reprocess: Wind Direction Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The wind direction was misaligned by 180 degrees. If the wind direction was 180 degrees or less, add 180 degrees to give the correct direction. If the wind direction was greater than 180 degrees, subtract 180 degrees to give the correct direction. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/20/2008 | 0830 | 11/13/2008 | 1830 |
| Subject: | SGP/EBBR/E4 - Wind Direction 20 Degrees Low |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The wind direction was too low by 20 degrees low. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/27/2009 | 1045 | 01/28/2009 | 1540 |
| Subject: | SGP/EBBR/E4 - Wind Speed Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The wind speed sensor was stopped by freezing rain. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/18/2009 | 0700 | 08/31/2009 | 2030 |
| Subject: | SGP/EBBR/E4 - Wind direction sensor failure |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | The wind direction was incorrect during this period because of a sensor failure. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/21/2010 | 0730 | 02/23/2010 | 2100 |
| Subject: | SGP/EBBR/E4 - Wind Speed Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | Icing stopped the wind speed sensor from making correct measurements. Wind direction measurements are questionable. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/22/2010 | 0000 | 05/10/2010 | 1900 |
| Subject: | SGP/EBBR/E4 - Net Radiometer Dome Broken |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | Sensible and latent heat fluxes and net radiation were incorrect (too small) because the net radiometer had a broken upper dome. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/25/1993 | 1630 | 10/25/1993 | 2100 |
| 10/31/1993 | 0430 | 10/31/1993 | 0830 |
| 10/24/1993 | 2200 | 10/25/1993 | 0500 |
| 10/27/1993 | 1630 | 10/27/1993 | 1730 |
| 11/01/1993 | 0130 | 11/01/1993 | 0630 |
| 10/25/1993 | 0700 | 10/25/1993 | 0800 |
| 10/27/1993 | 1830 | 10/28/1993 | 0100 |
| 10/23/1993 | 1830 | 10/24/1993 | 0000 |
| 10/25/1993 | 2300 | 10/27/1993 | 0600 |
| 11/04/1993 | 0700 | 11/04/1993 | 1830 |
| 10/28/1993 | 1530 | 10/29/1993 | 0830 |
| 10/24/1993 | 1430 | 10/24/1993 | 1930 |
| 10/31/1993 | 1700 | 11/01/1993 | 0030 |
| 11/01/1993 | 1700 | 11/04/1993 | 0230 |
| 10/23/1993 | 0100 | 10/23/1993 | 0330 |
| 10/27/1993 | 1200 | 10/27/1993 | 1300 |
| 10/31/1993 | 1030 | 10/31/1993 | 1600 |
| Subject: | SGP/EBBR/E4 - Reprocess: Intermittently bad soil heat flux sensor #4 |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | On October 23, 1993 soil heat flux sensor #4 (which had been installed on September 23, 1993) of the Plevna, KS EBBR (E4) developed an intermittent poor electrical contact with the multiplexer. Corrupted 30 minute values of shf4, c_shf4, g4, ave_shf, h, and e, and corrupted 15 minute values of mv_hft4 resulted from this situation. The quantities shf4, c_shf4, g4, and mv_hft4 are bad data values and are not recoverable. The other quantities can be recalculated using the three functioning sets of soil sensors. (Note: Soil heat flux sensor #5 was also malfunctioning during the time periods identified and has therefore been eliminated from the recalculation equations. This problem is identified in a separate DQR.) ave_shf = (g1 + g2 + g3)/3 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/02/1993 | 0000 | 09/03/1993 | 2359 |
| 09/06/1993 | 0000 | 09/08/1993 | 2359 |
| 08/29/1993 | 0000 | 08/29/1993 | 2359 |
| 09/10/1993 | 0000 | 09/16/1993 | 2359 |
| 09/18/1993 | 0000 | 09/29/1993 | 2359 |
| 10/01/1993 | 0000 | 10/11/1993 | 2359 |
| 10/13/1993 | 0000 | 10/31/1993 | 2359 |
| 11/01/1993 | 0000 | 11/04/1993 | 2359 |
| Subject: | SGP/EBBR/E4 - AEM malfunction |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | Beginning when the E4, Plevna EBBR was moved to a different location in the same area on August 29, 1993, the home_15 signal began to malfunction intermittently. The home_15 signal is normally between 45 and 53; in the case where it malfunctions, it reads approximately 22. The home signal is sampled only once per fifteen minute period to indicate the position of the Automatic Exchange Mechanism (AEM). However, the realtime value is used every 30 seconds to determine the sign of the gradient of temperature and relative humidity. Clearly, the 15 minute sample may not always reflect the proper position if something is wrong with the AEM. Therefore, when the home_15 signal is incorrect for a half hour, it is wise to view the preceding and successive half hours of data with suspicion as well as the half hour of interest. Affected data are 5 minute values of mv_home; 15 values of tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, and home; 30 minute values of tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h, and home_15. The dates on which this problem occurred were (all 1993) August 29, September 2, 3, 6-8, 10-16, 18-29, October 1-11, 13-31, and November 1-4. On November 4, 1993 the AEM was replaced at Plevna, correcting the problem described in this PIF. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/16/1993 | 1630 | 12/16/1993 | 1700 |
| Subject: | SGP/EBBR/E4 - Invalid data during E4 battery exchange |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | On December 16, 1993 the battery for the EBBR at Plevna, KS (E4) was replaced. This invalidates all 5, 15 and 30 minute data for the half hour concluding at 1700 GMT. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/16/1993 | 2100 | 12/16/1993 | 2130 |
| Subject: | SGP/EBBR/E4 - Invalid data due to AEM not exchanging |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | The AEM didn't exchange during the half hour ending 2130 GMT on December 16, 1993. This invalidates the half hour values of bowen, e, and h. We do not know the biases of the temperature and relative humidity sensors and thus should not recalculate bowen, e, and h from the 5 and/or 15 minute data between 2100 and 2130 GMT. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/10/1994 | 1630 | 02/10/1994 | 1700 |
| Subject: | SGP/EBBR/E4 - Invalid data during shutdown for PM on 2/10/94 |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | During a preventative maintenance visit on February 10, 1994, a modification to a calibration in the EBBR CR10 program required the system to be down for a short time. All data between 1630 and 1700 GMT on that day is invalid. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/22/1994 | 0615 | 02/23/1994 | 1945 |
| Subject: | SGP/EBBR/E4 - Invalid wind speed frozen sensor |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | On February 22, 1994 the EBBR wind speed sensor at E4, Plevna, KS was frozen to a stationary condition by ice. It broke free in a strong wind on February 23, 1994. Invalid data for the time period indicated is: 30 minute: wind_s, res_ws 15 minute: wind_s 5 minute: wind_s, res_ws. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/10/1994 | 1613 | 03/24/1994 | 1810 |
| Subject: | SGP/EBBR/E4 - Improper Net Radiometer Calibration |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | When a replacement net radiometer was installed on March 10, 1994, the calibration sheet for the new sensor could not be found. That was because the manufacturer had not provided one with the instrument. So, the calibration for the previous sensor was left in the EBBR CR10 program. I obtained the calibration sheet from the manufacturer, and upon return to Plevna on the next preventative maintenance visit, on March 24, site operations personnel entered the correct calibration into the program. The change in calibration was from 13.1 to 13.0. This change has negligible ( less than one percent) effects on calculations in the program and does not warrant recalculations. However, the net radiation itself could be recalculated by multiplying by the ratio of 13.0 to 13.1. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/02/1994 | 1731 | 06/02/1994 | 1800 |
| Subject: | SGP/EBBR/E4 - Soil Heat Flux Plate #5 |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | Soil heat flux plate #5 has indicated high at extremes, for both positive and negative outputs. At around -130 watts per meter squared for #5, the other four heat flux plates indicated approximately half as much. After replacement on June 2, 1994 at 1752 GMT, SHF #5 is now very similar to the other four plates. The effect on average soil heat flux amounted to only about 2% of the net radiation value at the worst; this is within the accuracy of the net radiation measurement and therefore does not require recalculation of the sensible and latent heat fluxes. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/03/1993 | 0000 | 06/30/1994 | 1714 |
| Subject: | SGP/EBBR/E4 - Pressure |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | Damage to some pressure sensors as a result, apparently, of high battery
voltage, caused pressure readings to vary significantly at a few EBBRs for
several months. I am being intentionally vague in making that statement as
there are DQRs and at least one PIF that cover those cases, except for the
situation at E4, Plevna, KS. Some time ago I had the suspect pressure sensors
replaced and "repaired". Unfortunately, the repairs were insufficient, as
we found out by using Plevna as a guinea pig for the "repaired" sensors to
see if they were working. It turns out that the three repaired sensors S/N
6500, 6504, and 6509 were better, but still experienced fluctuations in
output that followed battery voltage level as the battery was charged by
the solar panel during the daylight hours. The fluctuations look like
long-term spikes, positive or negative at different times, and lasted from one
to several hours. The fluctuations had minimal impact on adjustments to
computed values from the EBBR.
Pressure data from Plevna for the period listed above should not be used
for absolute values. That is why I marked "questionable", in the data
labelling section, but this applies only to the pressure data itself.
The following documents the use of pressure sensors at Plevna:
1) The original sensor, S/N 6509 was removed for repair on 1/13/94 and
replaced with the "repaired" S/N 6500.
2) S/N 6500 was removed for repair on 2/10/94 and replaced with the
"repaired" S/N 6504.
3) S/N 6504 was removed on 3/24/94 and replaced with "repaired" (2nd
time) S/N 6500.
4) S/N 6500 was removed on 5/5/94 and replaced with "repaired" (2nd time) S/N
6504.
5) S/N 6504 was removed on 5/19/94 and replaced with "repaired" S/N
6509.
6) S/N 6509 was removed on 6/30/94 and replaced with a new sensor, S/N
6579.
Sensors 6500, 6504, and 6509 have been thrown away, as the manufacturer
appears to be incapable of repairing them completely. Rather than waste
more money in trying to have them repaired, I ordered three new pressure
sensors, of which S/N 6579 is one. Thus, we now have two new sensors as spares. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/30/1994 | 1600 | 06/30/1994 | 1730 |
| 07/03/1994 | 0830 | 07/11/1994 | 2300 |
| Subject: | SGP/EBBR/E4 - Wind Direction Sensor Malfunction |
| DataStreams: | sgp30ebbrE4.b1, sgp15ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | During two periods recently, the wind direction sensor at E4, Plevna, KS malfunctioned. The first time period was caused by water in the connector to the sensor. The second period was apparently a result of an electronics problem in the sensor circuitry. On June 30, at 1646 GMT sensor S/N 3036 was removed and replaced with S/N 3034. On July 11, at 2003 GMT, sensor S/N 3034 was replaced with S/N 3038. The periods of time listed above are inclusive for the 30 minute data. Slightly less of the 5 and 15 minute values were affected (at the beginning or end of the periods), as is obvious from the sensor replacement times. All of the data should be considered incorrect. The affected data are: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, sigma_wd |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/06/1994 | 1200 | 12/09/1994 | 1930 |
| Subject: | SGP/EBBR/E4 - Frozen Wind Instruments |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | On December 6, 1994 a frontal system deposited freezing rain in central Kansas that resulted in the EBBR wind instrument becoming frozen in place at E4 for a few days. The direction and speed instruments were frozen for slightly differents lengths of time. The times and fields to be indicated as incorrect are shown below (all 5, 15, and 30 minute data measured during the periods, inclusive, is incorrect): Wind Speed: 12/06/94 1200 GMT - 12/09/94 1930 GMT 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws Wind Direction: 12/06/94 1400 GMT - 12/08/94 2230 GMT 5 minute: wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/14/1994 | 0700 | 02/15/1994 | 0030 |
| Subject: | SGP/EBBR/E4 - Frozen Wind Speed Sensor |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | On February 14, 1994 a frontal system deposited freezing rain in central Kansas that resulted in the EBBR wind speed instrument becoming frozen in place at Plevna (E4) for part of two days. All 5, 15, and 30 minute data values indicated below are incorrect for the period listed above. 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/23/1995 | 2231 | 07/23/1995 | 2300 |
| Subject: | SGP/EBBR/E4 - Reprocess: Soil Temperature Malfunction |
| DataStreams: | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | During a single half hour on July 23, soil moisture probe #3 indicated a value that was below the acceptable minimum, for unknown reasons. The affected quantities are: 15 minute: r_sm3 30 minute: sm3, c_shf3, cs3, ces3, g3, ave_shf, e, h |
| Measurements: | sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/25/1995 | 1630 | 11/10/1995 | 0000 |
| Subject: | SGP/EBBR/E4 - Annual calibration changeout |
| DataStreams: | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | On October 25, 1995 the changeout for annual calibration occurred at E4,
Plevna, KS. SEBS unit 8 was removed and unit 12 was installed. Between
1630 and 2130 GMT no data was collected. The soil moisture sensors were
shipped dry from the vendor. Site operations did not realize this and
installed them without wetting the bags that hold the soil moisture sensors
in soil. Site operations did soak the soil after installing the sensors (
as per the procedure). The water did not penetrate into the bags of soil.
Therefore, all soil moisture sensor outputs remained offscale until
October 26. At that point only SM1 came onscale.
This situation continued until 1 November 1995. A couple of days before that
the mentor discovered (in a conversation with the vendor) that the wrong SEBS
unit had been installed. Unit 13 was the unit for which soil specific soil
moisture sensor calibrations had been performed for Plevna; this had not been
made clear either to the mentor or to site operations. On 1 November SEBS
unit 12 was removed from Plevna and SEBS 13 was installed. No data was
collected between 1630 and 2100 GMT.
For SEBS unit 13, SM1, SM3, and SM5 were offscale initially. SM5 came
onscale on 3 November, although the data from it was incorrect until 1900
GMT on 4 November. SM1 and SM3 came onscale on 7 November, went offscale
for a short period on 8 November and stabilized to correct levels at the
beginning of 10 November. All data since then is correct.
Most of the data from the use of SEBS 12 at Plevna is incorrect. It would
be wise to not use it. The incorrect soil moisture after SEBS 13 was
installed affected numerous other data values including:
15 minute: rr_sm1, rr_sm2, rr_sm3, rr_sm4, rr_sm5
30 minute: h, e, ave_shf, shf1, shf2, shf3, shf4, shf5, sm1, sm2, sm3,
sm4, sm5, cs1, cs2, cs3, cs4, cs5, ces1, ces2, ces3, ces4,
g1, g2, g3, g4, g5 |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/11/1995 | 0031 | 11/11/1995 | 0100 |
| Subject: | SGP/EBBR/E4 - Soil Moisture Sensor Offscale |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | The 30 minute output of soil moisture sensor #1 at Plevna, Ok, E4 was offscale for 0100 on 11 November 1995. The reason for this is unknown; a remote communications error or a gliche in the CR10 itself are possibilities. No effect on the 15 minute data occurred. The data affected are: 30 minute: sm1, ave_shf, g1, c_shf1, cs1, ces1, h, e |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/17/1995 | 1931 | 11/17/1995 | 2000 |
| Subject: | SGP/EBBR/E4 - Soil Moisture Probe 1 Offscale |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | During one half hour, soil moisture probe #1 indicated a value that was offscale for an unknown reasons. Affected data values are: 15 minute: rr_sm1 30 minute: sm1, c_shf1, cs1, ces1, g1, ave_shf, e, h Sensible, latent, and soil heat fluxes can be recalculated using the change in energy storage of probes 2-5 as follows. ave_shf = (g2 + g3 + g4 + g5)/4 e = -(q + ave_shf)/(1 +bowen) h = -(e + ave_shf +q) |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/29/1995 | 1745 | 11/29/1995 | 2030 |
| Subject: | SGP/EBBR/E4 - Battery change |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | On 29 November 1995, the Gel Cell battery for the E4 EBBR at Plevna, KS
was replaced with a lead acid battery. Gel Cells do not charge or keep
a charge in cold weather as well as lead acid batteries. Some data loss
and incorrect data resulted. Of the period listed above, the data that is
missing and incorrect is listed below. Some data for the incorrect periods
is incorrect (sensible and latent heat fluxes), while other data values may be
correct (for example: wind speed and direction, soil moisture, etc.) It
may be wise to not use any of the 2030 GMT 5, 15, and 30 minute data.
5 minute: missing 1745-2010 GMT
incorrect 2015-2030 GMT
15 minute: missing 1745-2000 GMT
incorrect 2015-2030 GMT
30 minute: missing 1800-2000 GMT
incorrect 2030 GMT |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/18/1995 | 1150 | 12/22/1995 | 0900 |
| Subject: | SGP/EBBR/E4 - Wind Speed Cups Frozen |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.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 E4, Plevna, KS on 18 January 1995. On 22 January, the cups broke free of the ice and 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: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/28/1995 | 0000 | 03/31/1996 | 2359 |
| Subject: | SGP/EBBR/E4 - Soil Moisture Probes Offscale |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | During numerous periods within the days listed above, individual soil moisture probes indicated high or offscale, on the dry side. The calibration of the probes in Plevna soil by REBS was inadequate to provide reliable soil moisture data. The data should be carefully inspected before use: soil moistures less than 3 should be considered incorrect; recalculation of ave_shf e, and h may be made using only the soil moisture sets with valid soil moisture values. Affected data values are (# represents 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 1 is incorrect: ave_shf = (g2 + g3 + g4 + g5)/4 e = -(q + ave_shf)/(1 +bowen) h = -(e + ave_shf +q) |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/18/1996 | 1850 | 04/18/1996 | 1920 |
| Subject: | SGP/EBBR/E4 - 3-month check |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.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 above; data times affected do not include the beginning time and do include the ending time (data files are denoted by the end time). |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/15/1996 | 0000 | 06/12/1996 | 1645 |
| Subject: | SGP/EBBR/E4 - Cups Missing From Anemometer |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | On or about 15 May 1996, the anemometer lost two of its three cups in a hailstorm. The exact day that this occurred cannot be determined from the data (9-15 May data is missing). The cups were replaced on 12 June 1996. The first period of good wind speed data is at 1700 GMT on 12 June. All wind speed measurements (including resultant wind speed) are incorrect for the period above. |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/19/1996 | 0000 | 09/15/1996 | 1645 |
| Subject: | SGP/EBBR/E4 - Reprocess: Soil Moisture Probe Low at Times |
| DataStreams: | sgp30ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | On 18 June 1996, soil moisture probe 5 data reduced to a very low level. At 0000 GMT on 19 June 1996 the soil moisture indicated below zero, which is not physically possible. Over the next few months the soil dried to a low enough moisture level that the output again went too low. The qc minimum limit of 0 will indicate these times. The output recovered to reasonable values on 1 July at 2100 GMT. It again went low on 4 July at 0100 and remained that way until at least 8 July. No data is available from 9 July to 24 July to allow us to see the behavior during that period. On 27 July, at 0330 GMT, the output was very high (113.8) for some unknown reason. The output also went offscale at 0000 on 3 August, for an unknown reason. The output again went low at 0800-1530 GMT on 10 September and 0000 GMT on 11 September through 0900 GMT on 15 September. No incorrect values have occurred since. However, it is clear that at very low soil moisture, probe 5 indicates lower than normal. It will be replaced when a spare is available. Affected data are: 15 minute: r_sm5 30 minute: sm5, c_shf5, g5, cs5, ces5, ave_shf, e, h |
| Measurements: | sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/31/1996 | 1804 | 10/31/1996 | 1840 |
| Subject: | SGP/EBBR/E4 - EBBR 3 Month Checks - 10 EFs |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.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: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/23/1996 | 2245 | 11/24/1996 | 2155 |
| Subject: | SGP/EBBR/E4 - Wind Speed Cups Frozen |
| DataStreams: | sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp15ebbrE4.b1 |
| Description: | Freezing rain, snow, and below freezing conditions during 23 November 1996 caused the wind speed sensor cups to freeze in a stopped state at E4, Plevna, KS. On 24 November, the cups broke free of the ice and 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: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/10/1997 | 0830 | 06/11/1997 | 2000 |
| Subject: | SGP/EBBR/E4 - Soil Moisture Sensor Offscale |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | The 30 minute output of soil moisture sensor #5 at Plevna, Ok, E4 has been going to a large magnitude negative number for low soil moistures for several months. The calibration coefficients were inadequate for low soil moistures. The coefficients have been changed to yield correct soil moistures at low soil moisture (at least, manipulation of the polynomial for low soil moistures yields correct results for a fixed temperature correction - extremes of soil temperature and thus the correction may not yield as satisfying results). These coefficients were derived from the original calibration data, but including use of low values not used originally. This particular probe's calibration data was almost exactly the same as another probe used at the same site, yet the coefficients derived by the vendor were very different. This made it particularly obvious that the original coefficients were not adequately tested (verification tests are not normally performed with dry soil, so this kind of problem would not normally show up during verification tests). Several days of data using the new coefficients yields encouraging results. I will continue to inspect the data to determine the success of this change. Data values affected: 30 minute: sm1, ave_shf, g1, c_shf1, cs1, ces1, h, e |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/30/1997 | 1832 | 04/30/1997 | 1918 |
| Subject: | SGP/EBBR/E4 - EBBR Biannual Checks |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | During EBBR 6-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: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/1998 | 1330 | 01/07/1998 | 1100 |
| 12/21/1997 | 1245 | 12/22/1997 | 1820 |
| 01/05/1998 | 0730 | 01/05/1998 | 1400 |
| Subject: | SGP/EBBR/E4 - EBBR Frozen Wind Speed |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.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: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/23/1997 | 1630 | 01/07/1998 | 1648 |
| Subject: | SGP/EBBR/E4 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.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: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/09/1998 | 1030 | 01/14/1998 | 1715 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Low Battery - Resulting In Incorrect Data |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | A low battery condition (less than 10.5 volts) caused a number of data fields to be incorrect at some times and all data fields to be incorrect at a more limited number of times. All data fields are suspect when the battery voltage drops below 10.5 volts because the CR10 cannot operate properly. Some sensors are affected slightly (i.e. pressure) at slightly larger voltages. The low battery condition resulted from an initially weak battery and a week of extremely low solar radiation (from heavy cloudiness) on the solar panel that provides most of the charging of the battery. Comments added by Marv Wesely: David Cook has been working with Dave Breedlove to try to assess the age of the batteries. The dates on the batteries need to be read during site visits and provided to David C. It's quite possible that they need to be replaced. It's work in progress, though slow at times. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/16/1998 | 0825 | 03/17/1998 | 0905 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Wind Speed Frozen |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1 |
| Description: | During the period indicated the wind speed sensor cups were frozen stalled by freezing rain. The data fields affected are: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements: | sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/30/1997 | 1805 | 10/30/1997 | 1840 |
| Subject: | SGP/EBBR/E4 - EBBR E4 3-Month Check |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.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 above. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/29/1998 | 0745 | 04/29/1998 | 1845 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Low Battery Voltage |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | On 29 April 1998 the battery voltage dropped to below 10.5 volts. No data, except for battery voltage, can be assumed to be correct during this period. The battery was replaced at 1830 GMT. The cause of the problem appears to be a failed solar panel charger/regulator. The voltage of the new battery has dropped steadily since installation; it is apparently not being charged. A work request has been submitted to have the charger/regulator replaced. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/29/1998 | 1955 | 04/29/1998 | 2030 |
| Subject: | SGP/EBBR/E4 - EBBR E4 6-Month Checks |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.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 above. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/10/1998 | 0430 | 06/22/1998 | 1230 |
| Subject: | SGP/EBBR/E4 - Reprocess: E4 EBBR Soil Moisture #5 Offscale In Dry Conditions |
| DataStreams: | sgp30ebbrE4.b1 |
| Description: | The soil moisture dropped so low that soil moisture could not be properly calculated by the polynomial equation that converts soil moisture sensor resistance into soil moisture percent. This has happened on occasion at other EBBR sites. All 30 minute soil moisture #5 data for this period is incorrect (15 minute resistance values are okay); this affects the calculation of average soil heat flow through contamination of the soil storage term and thus sensible and latent heat fluxes. The thirty minute values that are incorrect are: sm5, c_shf5, cs5, ces5, g5, ave_shf, e, h. |
| Measurements: | sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/17/1998 | 0000 | 05/27/1998 | 1830 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Data Missing |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1 |
| Description: | Most of the data for the period is missing. The solar panel regulator was not working, allowing the EBBR battery to slowly and steadily be depleted. The voltage level dropped too low for the system to continue to operate and data was lost or was not measured. A new regulator was installed on 27 May and data collection was resumed. |
| Measurements: | sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/08/1998 | 0445 | 11/10/1998 | 1430 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Battery Voltage Low, Data Incorrect |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| Description: | Battery voltages less than 10.4 volts occurred much of the time. All data should be considered incorrect when the voltage is less than 10.4 volts. |
| Measurements: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/19/1998 | 0000 | 12/25/1998 | 2330 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Battery Voltage Low, Data Incorrect (Corrected begin date) |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| 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: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/1999 | 0530 | 01/06/1999 | 1630 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Battery Voltage Low, Data Incorrect |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| 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: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/08/1998 | 0630 | 11/10/1998 | 1430 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Water In Net Radiometer, Flux Data Incorrect |
| DataStreams: | sgp5ebbrE4.b1, sgp30ebbrE4.b1, sgp15ebbrE4.b1, sgp5ebbrE4.00 |
| Description: | Incorrect Net Radiation values resulted from water in the bottom dome. Thus incorrect sensible and latent heat fluxes resulted. Affected values are: 5 minute: q 15 minute: mv_q 30 minute: q, e, h |
| Measurements: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/1999 | 1650 | 01/02/1999 | 2000 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Wind Speed Data Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp5ebbrE4.00 |
| 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: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/1999 | 0545 | 01/06/1999 | 1400 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Battery Voltage Low |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| Description: | Battery voltage dropped below 10.4 volts. All data should be considered to be incorrect. |
| Measurements: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/1999 | 1130 | 01/06/1999 | 1630 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Data Missing/Incorrect |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| Description: | Battery voltage dropped below 10.4 volts, causing some data to be missing and some to be incorrect, as follows: 15 minute: 1600-1615 missing, 1630 incorrect 30 minute: 1130-1600 missing, 1630 incorrect |
| Measurements: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/29/1999 | 0945 | 01/29/1999 | 2000 |
| Subject: | SGP/EBBR/E4 - EBBR E4 Wind Speed Iced, Data Incorrect |
| DataStreams: | sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.b1, sgp5ebbrE4.00 |
| Description: | The wind speed sensor was stopped by icing. Wind speed data is incorrect. The values are: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp30ebbrE4.b1:
sgp15ebbrE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/31/1999 | 1300 | 02/03/1999 | 1515 |
| Subject: | SGP/EBBR/E4 - E4 EBBR Battery Voltage Low |
| DataStreams: | sgp5ebbrE4.b1, sgp15ebbrE4.b1, sgp30ebbrE4.b1, sgp5ebbrE4.00 |
| Description: | A blown fuse in the AEM stopped it at a position other than a home position. This created a condition where the battery drained more rapidly than normal, causing the voltage to drop below the acceptable voltage of 10.4 V at times. The 15 minute data shows battery voltage; all 5, 15, and 30 minute data for voltages less than 10.4 volts should be considered to be incorrect. |
| Measurements: | sgp5ebbrE4.00:
sgp5ebbrE4.b1:
sgp15ebbrE4.b1:
sgp30ebbrE4.b1:
|