DQR ID | Subject | Data Streams Affected |
---|---|---|
D000211.11 | ||
D000221.6 | SGP/EBBR - EBBR E9 Anemometer Frozen, Wind Speed Incorrect | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D000301.8 | SGP/EBBR - EBBR E9 Net Radiation Incorrect | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D940301.6 | SGP/EBBR/E9 - Invalid wind speed frozen sensor | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D940329.3 | SGP/E9/EBBR - AEM Malfunction | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D940503.1 | SGP/EBBR/E9 - AEM failure | sgp30ebbrE9.a1 |
D940711.2 | SGP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor Failure | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
D940826.1 | SGP/EBBR/E9 - Malfunctioning Wind Dir Sensor, Incorrect SM2 Results | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D940826.2 | SGP/EBBR/E9 - Reprocess: Soil Heat Flux Out of Range | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
D940830.7 | SGP/EBBR/E9 - Hail Damage to Net Radiometer and Wind Speed Sensor | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D941021.4 | ||
D941221.1 | SGP/EBBR/E26 - T/RH Check | sgp15ebbrE26.a1, sgp30ebbrE26.a1, sgp5ebbrE26.a0 |
D950126.2 | SGP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor 5 Incorrect Data | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
D950308.2 | SGP/EBBR/E9 - Radiation Shield Problem | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D950626.11 | SGP/EBBR/E9 - Stopped Ventilation Fan | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D950626.6 | SGP/EBBR/E9 - Frozen Wind Speed Sensor | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D950626.8 | SBP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor 5 Incorrect Data | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
D951020.1 | SGP/EBBR/E9 - 3-month Check | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D951116.1 | SGP/EBBR/E13 - AEM Exchange Stopped in Snow and Freezing Rain | sgp30ebbrE13.a1 |
D951127.1 | SGP/EBBR/E9 - Annual calibration changeout | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D960321.1 | SGP/EBBR/E9 - Wind Speed Cups Frozen | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D960508.4 | SGP/EBBR/E9 - 3-month check | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D961122.10 | SGP/EBBR/E9 - Air Temperature Thermocouples Incorrect | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D961122.19 | SGP/EBBR/E4 - EBBR 3 Month Checks - 10 EFs | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D970623.2 | SGP/EBBR/E9 - Temperature Portion of T/RH Probe | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
D971021.1 | SGP/EBBR/E7 - EBBR Biannual Checks | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
D971027.8 | SGP/EBBR/E9 - Wind Direction Sensor Malfunction | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D980117.4 | ||
D980117.5 | SGP/EBBR/E26 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown) | sgp15ebbrE26.a1, sgp30ebbrE26.a1, sgp5ebbrE26.a0 |
D980117.8 | SGP/EBBR/E2 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected | sgp15ebbrE2.a1, sgp30ebbrE2.a1, sgp5ebbrE2.a0 |
D980410.5 | SGP/EBBR/E9 - Wind Speed Sensor Frozen | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
D980413.1 | ||
D980416.10 | SGP/EBBR/E9 - 3-Month Check | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D980529.8 | SGP/EBBR/E9 - Six Month Checks | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D990127.12 | SGP/EBBR/E9 - Wind Direction Data Incorrect | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
D990127.8 | SGP/EBBR/E9 - EBBR E9 Net Radiometer Dome Broken, Flux Data Incorrect | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
D990128.6 | SGP/EBBR/E9 - Wind Speed Data Incorrect | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
D990128.7 | SGP/EBBR/E9 - Wind Speed Data Incorrect | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
D990622.5 | SGP/EBBR/E9 - Wind Speed Incorrect | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
D990623.1 | SGP/EBBR/E9 - Right Aspirator Not Working | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Start Date | Start Time | End Date | End Time |
---|
Subject: | |
DataStreams: | |
Description: | |
Measurements: |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/18/1999 | 0800 | 12/18/1999 | 1930 |
Subject: | SGP/EBBR - EBBR E9 Anemometer Frozen, Wind Speed Incorrect |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | The anemometer cups were frozen stalled. The following values were therefore incorrect: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/28/1999 | 0230 | 09/30/1999 | 1500 |
Subject: | SGP/EBBR - EBBR E9 Net Radiation Incorrect |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
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: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/23/1994 | 0400 | 02/24/1994 | 1300 |
Subject: | SGP/EBBR/E9 - Invalid wind speed frozen sensor |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | On February 23, 1994 the EBBR wind speed sensor at E9, Ashton, KS was frozen to a stationary condition by ice. It broke free in strong winds on February 24, 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: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/11/1993 | 1501 | 03/22/1994 | 1643 |
Subject: | SGP/E9/EBBR - AEM Malfunction |
DataStreams: | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | EDITOR'S NOTE: This DQR refers, in part, to data collected prior to the begin date of regular ARM data. During the first month covered by this DQR, the EBBR.E9 data were not archived with standard ARM names. The data are therefore not readily available, but can be made available by special request. The total period covered by the problem documented here is 930615.0000-940322.1643. The AEM at E9 frequently did not function properly during the time period stated. Please see the notes in the EBBR platform describing home signal conditions for which certain of the data fields are suspect. The newly installed AEM is performing properly so far. The files could be flagged, but it is up to the user to read the platform notes concerning the condition of the home signal and then view the quality of the data accordingly. I would be at my terminal full- time in attempting to list all days and times and data fields that are affected by the numerous AEM malfunctions. Furthermore, I have done so previously in several PIFs that I will reference here for information: P931101.4, P931115.2, P940105.2, P940211.3 |
Measurements: | sgp5ebbrE9.a0:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/05/1994 | 1500 | 04/19/1994 | 1525 |
Subject: | SGP/EBBR/E9 - AEM failure |
DataStreams: | sgp30ebbrE9.a1 |
Description: | The Automatic Exchange Mechanism would not function. It was decided to take the unit back to SGP CART to try to repair it. A spare AEM was not available for a replacement, so the aspirated radiation shields housing temperature and humidity gradient sensors were attached to the EBBR framework, one meter apart vertically, with the right side in the lower position. The housings remained this way for two weeks. During this time period, home signal, sensible heat flux, and latent heat flux values are incorrect. Significant reprocessing would be required to obtain correct fluxes, and that would be possible only if one assumed that offsets in the sensor calibrations are negligible; that is a very debatable assumption considering that the EBBR system is already half a year past due for calibration. |
Measurements: | sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/15/1994 | 2100 | 06/15/1994 | 2130 |
06/15/1994 | 2300 | 06/16/1994 | 0030 |
06/16/1994 | 2130 | 06/17/1994 | 1530 |
06/17/1994 | 1900 | 06/17/1994 | 1930 |
06/18/1994 | 0200 | 06/25/1994 | 1930 |
06/25/1994 | 2300 | 06/28/1994 | 1600 |
Subject: | SGP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor Failure |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | Failure of soil heat flow sensor #5 at E9, Ashton, KS resulted in incorrect data values for 6 fields for much of the period of time listed above. The soil heat flow values from #5 were so large (in the absolute) that it deleteriosly affected the soil heat flux average and the sensible and latent heat fluxes. The fields affected were: 30 minute: shf5, c_shf5, g5, ave_shf, e, h 15 minute: mv_hft5. I list only the 30 minute times affected below; it can be assumed that the 15 minute value contained in the half hour are incorrect. Sensor #5 was replaced at 1545 GMT on June 28. Old S/N 923029, new S/N 923092. Half hour 1600 GMT is missing due to having to reload the CR10 program with a new shf5 calibration. Sensible and latent heat fluxes can be recomputed by averaging soil heat flow sensors 1-4; use the following equations: ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q +ave_shf)/(1 + bowen) h = e * bowen, where g is total soil heat flow, q is net radiation, and bowen is Bowen Ratio. Affected half hours: Date Times (GMT) 6/15 2130, 2300, 2330 6/16 0000, 0030, 2130-2330 6/17 0000-1530, 1900, 1930 6/18 0200-2330 6/19 All 6/20 All 6/21 All 6/22 All 6/23 All 6/24 All 6/25 0000-1930, 2300, 2330 6/26 All 6/27 All 6/28 0000-1600 |
Measurements: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/19/1994 | 0100 | 08/23/1994 | 1530 |
Subject: | SGP/EBBR/E9 - Malfunctioning Wind Dir Sensor, Incorrect SM2 Results |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | It has been reported previously that a malfunction of the wind direction sensor resulting in zero or 135 degree outputs can cause the soil moisture #2 sensor to read offscale. The two sensors are attached to a multiplexer pair. The manufacturer of the multiplexer and data acquisition system have not been able to explain how our instrument configuration can cause this effect. Shortly after 0030 GMT on August 20, 1994 significant rainfall occurred, being reflected in more than a doubling of soil moisture within an hour. During the time period listed above, the wind direction sensor mulfunctioned (apparently caused by water in the wind direction sensor electronics), causing the following data fields to be incorrect: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_dir 30 minute: res_ws, wind_d, sigma_wd. During part of the listed period, Soil Moisture #2 was also incorrect, being offscale; during those times the following 30 minute data is also incorrect: 30 minute: sm2, c_shf2, ave_shf, cs2, ces2, g2, h, e. |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/17/1994 | 1700 | 08/17/1994 | 2300 |
Subject: | SGP/EBBR/E9 - Reprocess: Soil Heat Flux Out of Range |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | For an unknown reason, soil heat flux sensor #5 indicated too small a value for the period listed above. This resulted in an incorrect average of soil heat flow for the five sets of soil heat flow plates, and therefore incorrect e (latent heat flux) and h (sensible heat flux) in the 30 minute data. The following data values are incorrect: 15 minute: mv_hft5 30 minute: shf5, c_shf5, ave_shf, g5, e, h The latent and sensible heat flux can be recalculated by using only soil heat flows 1 through 4 to calculate the average soil heat flow, ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q). |
Measurements: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/20/1994 | 0130 | 08/23/1994 | 1600 |
Subject: | SGP/EBBR/E9 - Hail Damage to Net Radiometer and Wind Speed Sensor |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | Golf ball size hail was reported for the Ashton site for early August 20, 1994. It damaged the wind speed sensor and the net radiometer shortly before 0130 GMT. The following data fields are to be flagged as incorrect for the periods listed above (resultant wind speed has already been indicated as incorrect in a previous DQR that documented the malfunction of the wind direction sensor): 5 minute: wind_s, res_ws, q 15 minute: wind_s, mv_q 30 minute: wind_s, res_ws, q, h, e. Note that h and e are also incorrect as a consequence of q being incorrect. |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|
Subject: | |
DataStreams: | |
Description: | |
Measurements: |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/09/1994 | 1615 | 11/09/1994 | 1800 |
Subject: | SGP/EBBR/E26 - T/RH Check |
DataStreams: | sgp15ebbrE26.a1, sgp30ebbrE26.a1, sgp5ebbrE26.a0 |
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: | sgp15ebbrE26.a1:
sgp5ebbrE26.a0:
sgp30ebbrE26.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/19/1994 | 1700 | 08/19/1994 | 2300 |
10/13/1994 | 1800 | 10/14/1994 | 1500 |
10/17/1994 | 2030 | 10/17/1994 | 2100 |
10/28/1994 | 2030 | 10/28/1994 | 2230 |
12/20/1994 | 0630 | 12/23/1994 | 0530 |
12/26/1994 | 1700 | 12/27/1994 | 0130 |
12/27/1994 | 1600 | 12/27/1994 | 1630 |
01/02/1995 | 0600 | 01/05/1995 | 1700 |
01/05/1995 | 2200 | 01/09/1995 | 0230 |
01/09/1995 | 0900 | 01/14/1995 | 0400 |
01/14/1995 | 0800 | 01/15/1995 | 0300 |
01/15/1995 | 1200 | 01/16/1995 | 1600 |
Subject: | SGP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor 5 Incorrect Data |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | Soil heat flow sensor #5 periodically outputted incorrect values from mid-August 1994 until mid-January 1995. The output often indicated large negative heat flow. The sensor was replaced on January 23, 1995, even though the previous week of data was correct. The data affected (and thus incorrect) includes: 15 minute: mv_hft5 30 minute: shf5, c_shf5, g5, ave_shf, e, h. The dates and times (GMT) of incorrect values are listed below. Only half hour times are listed. 08/19/94 1700-2300 10/13/94 1800-2330 10/14/94 0000-1500 10/17/94 2030-2100 10/28/94 2030-2230 12/20/94 0630-2330 12/21/94 0000-2330 12/22/94 0000-2330 12/23/94 0000-0530 12/26/94 1700-2330 12/27/94 0000-0130, 1630 01/02/95 0600-2330 01/03/95 0000-2330 01/04/95 0000-2330 01/05/95 0000-1700, 2200-2330 01/06/95 0000-2330 01/07/95 0000-2330 01/08/95 0000-2330 01/09/95 0000-0230, 0900-2330 01/10/95 0000-2330 01/11/95 0000-2330 01/12/95 0000-2330 01/13/95 0000-2330 01/14/95 0000-0400, 0800-2330 01/15/95 0000-0300, 1200-2330 01/16/95 0000-1600 The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1 through 4 to calculate the average soil heat flow, ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/21/1995 | 0030 | 02/21/1995 | 1600 |
Subject: | SGP/EBBR/E9 - Radiation Shield Problem |
DataStreams: | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | The left radiation shield was off during the period of time above. Close inspection of the 15 minute data was required to detect when the shield fell off. As is often the case in such a situation, the 30 minute data does not adequately indicate such a failure. A radiation shield has fallen off of an EBBR before, apparently a result of vibration of the AEM during exchanges. All air and humidity probe temperatures (except the reference temperature), relative humidities, vapor pressures, Bowen ratio, sensible heat flux, and latent heat flux during this period are considered to be incorrect. |
Measurements: | sgp5ebbrE9.a0:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/18/1995 | 0130 | 04/18/1995 | 1620 |
Subject: | SGP/EBBR/E9 - Stopped Ventilation Fan |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | On April 18, 1995, a site operator discovered the right aspirator ventilation fan of the EBBR to be stopped. Inspection of the data indicates that this condition began early in the GMT day. Interpretation of the start time of the condition is made more difficult by a slight bias low in absolute temperature in comparison to the left temperature probe. 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 period above 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: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/07/1995 | 0245 | 03/08/1995 | 1640 |
Subject: | SGP/EBBR/E9 - Frozen Wind Speed Sensor |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | On March 7, 1995 freezing rain stopped the cups of the EBBR wind speed instrument at Ashton, KS (E9). 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: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/10/1995 | 2100 | 03/10/1995 | 2130 |
03/11/1995 | 0100 | 03/11/1995 | 0600 |
03/11/1995 | 1530 | 03/12/1995 | 1930 |
03/13/1995 | 0430 | 03/13/1995 | 0500 |
03/16/1995 | 1830 | 03/18/1995 | 1100 |
03/19/1995 | 2100 | 03/20/1995 | 0400 |
03/20/1995 | 1530 | 03/20/1995 | 1700 |
Subject: | SBP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor 5 Incorrect Data |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | Soil heat flow sensor #5 periodically outputted incorrect values during the period above. The output often indicated large negative heat flow. The sensor connections were tightened on March 20, 1995, which seems to have corrected the problem. The data affected (and thus incorrect) includes: 15 minute: mv_hft5 30 minute: shf5, c_shf5, g5, ave_shf, e, h. The dates and times (GMT) of incorrect values are listed below. Only half hour times are listed. 03/10/95 2130 03/11/95 0100-0600, 1530-2330 03/12/95 0000-1930 03/13/95 0500 03/16/95 1830-2330 03/17/95 0000-2330 03/18/95 0000-1100 03/19/95 2100-2330 03/20/95 0000-0400, 1530-1700 The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1 through 4 to calculate the average soil heat flow, ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/05/1995 | 1530 | 10/05/1995 | 1830 |
Subject: | SGP/EBBR/E9 - 3-month Check |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
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: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/11/1995 | 0700 | 11/11/1995 | 0730 |
Subject: | SGP/EBBR/E13 - AEM Exchange Stopped in Snow and Freezing Rain |
DataStreams: | sgp30ebbrE13.a1 |
Description: | On the night of November 10-11, a north-south line from south central Kansas through south central Oklahoma received snow and freezing rain and experienced below freezing temperatures. This caused the EBBR automatic exchange mechanism (AEM) to stop exchanging temporarily. Note that temperatures, relative humidities, and vapor pressures are not affected; these are correct as measured, but the height at which the measurements occurred must be determined from the home signal value. |
Measurements: | sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/15/1995 | 1230 | 11/15/1995 | 2100 |
Subject: | SGP/EBBR/E9 - Annual calibration changeout |
DataStreams: | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | On November 15, 1995 the changeout for annual calibration occurred at E9, Ashton, KS. SEBS unit 4 was removed and unit 6 was installed. Between 1230 and 2100 GMT no data was collected; data during this period is missing. |
Measurements: | sgp5ebbrE9.a0:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/23/1996 | 0450 | 01/23/1996 | 1555 |
Subject: | SGP/EBBR/E9 - Wind Speed Cups Frozen |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | Freezing rain, snow, and below freezing conditions during 23 January 1996 caused the wind speed sensor cups to freeze in a stopped state at E9, Ashton, KS. Site operations personnel removed the ice from the cups later in the day to allow them to turn 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: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/30/1996 | 1731 | 04/30/1996 | 1800 |
Subject: | SGP/EBBR/E9 - 3-month check |
DataStreams: | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
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: | sgp5ebbrE9.a0:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/20/1996 | 1430 | 09/20/1996 | 1500 |
Subject: | SGP/EBBR/E9 - Air Temperature Thermocouples Incorrect |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | Both air temperature thermocouples were offscale, for unknown reasons, for 1500 GMT for both 15 and 30 minute air temperature values. The malfunction of the air temperature thermocouples 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, tair_l 30 minute: tair_top, tair_bot, bowen, e, and h |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
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: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
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.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/15/1996 | 1715 | 06/18/1997 | 1645 |
Subject: | SGP/EBBR/E9 - Temperature Portion of T/RH Probe |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | The Temperature portion of the right T/RH probe indicated too high a temperature for nearly 11 months. I twice placed work requests to have the probe replaced, but no spares were available. Spares recently became available and I placed a new work request to have the probe changed. The replacement occurred on 18 June 1997; this fixed the problem. The main results of the high temperatures were probe top and bottom temperatures (used only for the calculation of vapor pressure) and vapor pressures that were too large. Furthermore, this caused latent heat flux to be reported to be too large, and therefore sensible heat flux was reported to be too small. Recalculation of the fluxes using thermocouple temperatures to calculate vapor pressure would be quite time consuming and would have to assume that the thermocouple temperature and probe temperature were nearly the same. The EBBR procedures have been changed to include comparison of the thermocouple and probe temperatures to make it easier for the site operators to detect this condition. The data affected (and thus incorrect) includes: 15 minute: rr_thum_r 30 minute: thum_top, thum_bot, vp_top, vp_bot, e, h, bowen. |
Measurements: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/16/1997 | 1533 | 04/16/1997 | 1625 |
Subject: | SGP/EBBR/E7 - EBBR Biannual Checks |
DataStreams: | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
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: | sgp15ebbrE7.a1:
sgp30ebbrE7.a1:
sgp5ebbrE7.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/10/1997 | 0000 | 09/30/1997 | 1550 |
Subject: | SGP/EBBR/E9 - Wind Direction Sensor Malfunction |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | During numerous intermittent times during the period listed, the wind direction sensor at E9, Ashton, KS malfunctioned, putting out a value of 135. The sensor was replaced on 30 September 1997, at 1550 GMT. All wind direction data with values of 135 during the period listed should be considered incorrect. The affected data are: 5 minute: res_ws, wind_d, sigma_d 15 minute: mv_wind_d 30 minute: res_ws, wind_d, sigma_d |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|
Subject: | |
DataStreams: | |
Description: | |
Measurements: |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/08/1998 | 0100 | 01/08/1998 | 2030 |
Subject: | SGP/EBBR/E26 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown) |
DataStreams: | sgp15ebbrE26.a1, sgp30ebbrE26.a1, sgp5ebbrE26.a0 |
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: | sgp15ebbrE26.a1:
sgp5ebbrE26.a0:
sgp30ebbrE26.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/24/1997 | 1530 | 01/08/1998 | 1515 |
Subject: | SGP/EBBR/E2 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected |
DataStreams: | sgp15ebbrE2.a1, sgp30ebbrE2.a1, sgp5ebbrE2.a0 |
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: | sgp15ebbrE2.a1:
sgp5ebbrE2.a0:
sgp30ebbrE2.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/14/1998 | 0500 | 01/15/1998 | 0030 |
Subject: | SGP/EBBR/E9 - Wind Speed Sensor Frozen |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
Description: | The wind speed sensor was frozen stalled during this period. Data values that were affected are: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
Measurements: | sgp5ebbrE9.a0:
sgp5ebbrE9.00:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|
Subject: | |
DataStreams: | |
Description: | |
Measurements: |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/16/1997 | 1928 | 10/16/1997 | 2002 |
Subject: | SGP/EBBR/E9 - 3-Month Check |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
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: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/14/1998 | 1740 | 05/14/1998 | 1759 |
Subject: | SGP/EBBR/E9 - Six Month Checks |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
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: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/12/1998 | 2100 | 11/25/1998 | 1830 |
Subject: | SGP/EBBR/E9 - Wind Direction Data Incorrect |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
Description: | The wind direction sensor stopped working correctly, resulting in the following values being affected: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, sigma_wd |
Measurements: | sgp5ebbrE9.a0:
sgp5ebbrE9.00:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/12/1998 | 1230 | 11/12/1998 | 2000 |
Subject: | SGP/EBBR/E9 - EBBR E9 Net Radiometer Dome Broken, Flux Data Incorrect |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
Description: | Incorrect Net Radiation values resulted in incorrect sensible and latent heat fluxes. Affected values are: 5 minute: q 15 minute: mv_q 30 minute: q, e, h |
Measurements: | sgp5ebbrE9.a0:
sgp5ebbrE9.00:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/1999 | 1515 | 01/03/1999 | 1830 |
Subject: | SGP/EBBR/E9 - Wind Speed Data Incorrect |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
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: | sgp5ebbrE9.a0:
sgp5ebbrE9.00:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/08/1999 | 0605 | 01/08/1999 | 1900 |
Subject: | SGP/EBBR/E9 - Wind Speed Data Incorrect |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
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: | sgp5ebbrE9.a0:
sgp5ebbrE9.00:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/22/1999 | 0750 | 04/29/1999 | 1850 |
Subject: | SGP/EBBR/E9 - Wind Speed Incorrect |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.00, sgp5ebbrE9.a0 |
Description: | The wind speed sensor lost two of the three cups. Flux data is not affected. The data values affected are: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
Measurements: | sgp5ebbrE9.a0:
sgp5ebbrE9.00:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/13/1999 | 1230 | 06/11/1999 | 1645 |
Subject: | SGP/EBBR/E9 - Right Aspirator Not Working |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | The result of the right aspirator not working was a reduction in measured temperature gradient and thus a reduction in estimated sensible heat flux and an increase in latent heat flux. The fluxes could be in error by as much as 10%. Reported right air and humidity probe temperatures, top and bottom air and humidity probe temperatures, right relative humidity, and top and bottom vapor pressure are affected. |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|