DQR ID | Subject | Data Streams Affected |
---|---|---|
D000229.2 | SGP/EBBR - EBBR E8 Left Air Temperature (thermocouple) Incorrect | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D000301.10 | SGP/EBBR - EBBR E8 Wind Direction Incorrect | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D931115.3 | SGP/EBBR/E8 - Drop in atmospheric pressure | sgp15ebbrE8.a0, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940106.1 | SGP/EBBR/E8 - Invalid data due to AEM fuse blow out at E8 | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940211.2 | SGP/EBBR/E8 - Invalid wind data frozen sensor | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940301.3 | SGP/EBBR/E8 - Invalid wind speed frozen sensor | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940830.10 | SGP/EBBR/E8 - Battery Voltage Drop | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940912.1 | SGP/EBBR/E8 - Data Corruption and Loss | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D941114.2 | SGP/EBBR/E8 - Water in Net Radiometer | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D941212.3 | SGP/EBBR/E8 - Frozen Wind Instruments | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D941221.1 | SGP/EBBR/E26 - T/RH Check | sgp15ebbrE26.a1, sgp30ebbrE26.a1, sgp5ebbrE26.a0 |
D950126.3 | SGP/EBBR/E8 - Frozen Wind Speed Instrument | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D950308.1 | ||
D950828.2 | AEM Home 30 Values Low | sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D950922.2 | SGP/EBBR/E8 - Home 30 Values Correct | sgp30ebbrE8.a1 |
D951020.1 | SGP/EBBR/E9 - 3-month Check | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D960508.3 | SGP/EBBR/E8 - 3-month check | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D961122.1 | SGP/EBBR/E8 - Annual Calibration Changeout | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D961122.14 | SGP/EBBR/E8 - Incorrect Right Humidity Probe Temperature | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
D961122.15 | SGP/EBBR/E8 - Reprocess: Soil Heat Flow Sensor 2 Incorrect Data | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
D961122.19 | SGP/EBBR/E4 - EBBR 3 Month Checks - 10 EFs | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D961122.6 | SGP/EBBR/E8 - Incorrect Soil Moisture #1 | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
D961122.7 | SGP/EBBR/E8 - Incorrect Soil Moisture #2, Soil Temperature #2 | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
D970616.1 | SGP/EBBR/E8 - Incorrect Soil Temperature #s 1 and 2 | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
D970703.1 | SGP/EBBR/E8 - Incorrect Soil Temperature #s 1 and 2 | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
D970716.2 | SGP/EBBR/E8 - AEM Inoperative | sgp30ebbrE8.a1 |
D971017.1 | SGP/EBBR/E8 - Reprocess: E8 EBBR Program Compile Error, Effect On Net Radiation | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D971017.2 | E8 EBBR Lightning Strike | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D971017.8 | SGP/EBBR/E8 - Reprocess: E8 EBBR Lightning Strike / sensor Replacements | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D971021.1 | SGP/EBBR/E7 - EBBR Biannual Checks | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
D971111.1 | SGP/EBBR/E8 - Reprocess: SHF2 Incorrect | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
D980117.4 | ||
D980117.7 | SGP/EBBR/E8 - Battery Low - Data Affected | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980117.9 | SGP/EBBR/E8 - Reprocess: E8 Soil Heat Flow #2 Failure - Replaced | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
D980410.4 | SPG/EBBR/E8 - Wind Speed Sensor and AEM Frozen | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980416.36 | SGP/EBBR/E8 - Wind Speed Frozen | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980416.37 | SGP/EBBR/E8 - Wind Speed Frozen | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980416.38 | SGP/EBBR/E8 - Wind Speed Frozen | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980416.9 | SGP/EBBR/E8 - 3-Month Check | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980526.2 | EBBR E8 Net Radiation Data Quality | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980529.7 | SGP/EBBR/E8 - Six Month Checks | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980603.1 | EBBR E8 Adjustment of Negative Net Radiation Values | sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980603.2 | EBBR E8 Adjustment of Negative Net Radiation Values | sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D980603.3 | SGP/EBBR/E8 - Wind Direction Incorrect | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D990127.13 | SGP/EBBR/E8 - Wind Direction and Speed Data Incorrect | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D990128.8 | SGP/EBBR/E8 - Wind Speed Data Incorrect | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D990202.3 | SGP/EBBR - EBBR E8 Wind Speed Iced, Data Incorrect | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.00, sgp5ebbrE8.a0 |
D990208.1 | SGP/EBBR/E8 - Wind Direction Incorrect | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D990208.2 | SGP/EBBR/E8 - Wind Speed Incorrect | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.00, sgp5ebbrE8.a0 |
D990415.2 | SGP/EBBR/E8 - Wind Speed Frozen | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/13/1999 | 1600 | 02/01/2000 | 1900 |
Subject: | SGP/EBBR - EBBR E8 Left Air Temperature (thermocouple) Incorrect |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | The left air temperature (thermocouple) frequently went offscale, for an unknown reason, thereby affecting many quantities. The affected data are: 5 minute: tair_bot, tair_top 15 minute: tair_l 30 minute: tair_bot, tair_top, bowen, h, e |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/22/1999 | 1300 | 09/28/1999 | 1830 |
Subject: | SGP/EBBR - EBBR E8 Wind Direction Incorrect |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | A malfunctioning wind direction sensor caused the wind direction measurement to be incorrect for the period. The affected data are: 5 minute: res_ws, wind_d 15 minute: mv_wind_d 30 minute: res_ws, wind_d |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/22/1993 | 1630 | 11/03/1993 | 1730 |
Subject: | SGP/EBBR/E8 - Drop in atmospheric pressure |
DataStreams: | sgp15ebbrE8.a0, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | Beginning September 22, 1993, the atmospheric pressure sensor at the E8 EBBR began showing drops of as much as 5 kPa for about half a day. These could be easily seen in comparisons with the SMOS pressure sensor. The drops were diurnal and occurred during daytime, at the same time as other quantities such as temperature, net radiation, and battery voltage were at the highest levels of the day. It is unclear what exactly caused this situation. Replacement of the Campbell multiplexer to which the pressure sensor was connected caused the problem to go away. The same multiplexer was then used as a replacement for the other multiplexer in the E8 EBBR and has not shown any odd behavior on the channel that previously served the pressure sensor. My conclusion is that there was poor electronic contact of the pressure sensor to the multiplexer. Affected pressure data can only be easily seen by comparison with SMOS pressure data. No EBBR data other than pressure is affected by the pressure problem; calculations of specific heat at constant pressure (which includes the term 1/(p-vp)) times other terms (including p-.378*vp) result in a very small error in the resulting Bowen Ratio. For example; assume a common vapor pressure (vp) of 2.0 kPa, a common atmospheric pressure of 97.0 kPa, and a corrupted atmospheric pressure of 92.0 kPa. Uncorrupted Corrupted (97.0-.378*2.0)/(97.0-2.0) = 1.0131 (92.0-.378*2.0)/(92.0-2.0) = 1.0138 1.0138/1.0131 = 1.00069 or 0.069% increase in the Bowen Ratio as a result of the corruption Therefore, no correction to the quantities calculated using pressure is warranted. |
Measurements: | sgp5ebbrE8.a0:
sgp15ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/17/1993 | 1100 | 12/29/1993 | 1700 |
Subject: | SGP/EBBR/E8 - Invalid data due to AEM fuse blow out at E8 |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On December 17, 1993, before 1100 GMT, the fuse in the AEM (Automatic Exchange Mechanism) of Coldwater, KS (E8) EBBR blew out. The AEM remained nonfunctional until the fuse was replaced just before 1700 GMT on December 29, 1993. During the 1000 GMT half hour on December 17 the AEM was hung up; this is clear from the home signal. These situations resulted in the following invalid data: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, home 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, mv_home, 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, home_15, home_30 Bowen, h, and e can not be recalculated from the 15 minute and/or 5 minute data since we cannot determine the position of the sensors on the AEM from the home signal; home signal is near zero when there is no power to the AEM. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/12/1994 | 1100 | 01/12/1994 | 1630 |
Subject: | SGP/EBBR/E8 - Invalid wind data frozen sensor |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On January 12, 1994 the EBBR wind speed sensor at E8, Coldwater, KS was frozen to a stationary by ice. Invalid data for the time period 1100 to 1630 GMT is: 30 minute: wind_s, res_ws 15 minute: wind_s 5 minute: wind_s, res_ws. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/21/1994 | 2330 | 02/23/1994 | 1800 |
Subject: | SGP/EBBR/E8 - Invalid wind speed frozen sensor |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On February 21, 1994 the EBBR wind speed sensor at E8, Coldwater, KS was frozen to a stationary condition by ice. 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: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/19/1994 | 1900 | 08/24/1994 | 1600 |
Subject: | SGP/EBBR/E8 - Battery Voltage Drop |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | Sometime after 0000 GMT on August 19, 1994 the cable from the solar panel to the EBBR battery was broken, presumably the result of severe weather that was in the area. The result was that the battery could not be charged by the solar panel, leading to a gradual reduction in battery voltage. By 1730 GMT on the 19th, the battery voltage had dropped to 10.8 volts and at about 1905 GMT had dropped too low to power the AEM. Some thirty minute data after 1900 GMT is therefore incorrect. By 2000 GMT the voltage had dropped to 10.7 volts and was too low to properly power the barometric pressure sensor (it's output dropped off from then on). At 1530 GMT on August 24, 1994 the solar panel connection to the battery was reestablished and normal data acquisition resumed at 1600 GMT. The last data file to be produced was apparently 0000 GMT (15 minute file) on 20 August. In an apparently related incident, soil temperature #3 skyrocketed in output beginning at about 1815 GMT; the cause for this is unknown, but is probably a result of the inability of the CR10 data logger to correctly measure the sensor resistance. By 1900 GMT this situation had caused elevated average soil heat flux, which in turn affected calculated e and h. Data fields that are incorrect for the time period listed, follow: 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 |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/01/1994 | 1700 | 09/01/1994 | 2230 |
09/03/1994 | 1530 | 09/07/1994 | 1700 |
Subject: | SGP/EBBR/E8 - Data Corruption and Loss |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | Data loss was experienced during the periods indicated for unknown reasons. My understanding is that ingestion of the data failed for these periods because the record length was shorter than it is supposed to be. Site Operations personnel visited the site on September 7 and powered down and then up, the EBBR, essentially causing a reload of the CR10 program. All output locations had been -9999 or 0000 when they had arrived. The battery condition was normal. Failure of a portion of the storage module may be indicated; data sneakernetted from the storage module shows an alternating sequence of two days, September 2 and 3 and then a stretch of garbage characters. No other days of data are found. The portion of the storage module memory that contained the program was not corrupted, as the CR10 program compiled and ran properly when it was reloaded from the storage module. The data after the period above is reasonable. The last part of the storage module memory may be bad and perhaps in trying to access it remotely multiple times the situation above resulted. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/21/1994 | 0300 | 11/02/1994 | 1715 |
Subject: | SGP/EBBR/E8 - Water in Net Radiometer |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | At some time previous to October 21, 1994, the top hemisphere of the net radiometer of the EBBR at E8 was pierced, probably by migrating birds. A DQR was issued by me a couple of weeks ago indicating other extended facilities at which this has happened. Net radiometer data was correct until October 21 at sometime between 0230 and 0300 GMT, when rain began to enter the radiometer; the effect can be easily seen in the data. Collection of 3/4 inch of water in the bottom hemisphere was not the only consequence of the situation. Unlike other net radiometers that have had this experience, this one produced incorrect data during daylight hours as well as during nightime hours until the water was removed, the sensor dried, and the hemispheres were replaced on November 2, 1994. During the period listed above, the following data are incorrect and cannot be recalculated: 5 minute: q 15 minute: mv_q 30 minute: q, h, e Science Team members or others using the data should recognize that the flux data is not correct for this fairly lengthy time period. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/06/1994 | 1200 | 12/09/1994 | 1530 |
Subject: | SGP/EBBR/E8 - Frozen Wind Instruments |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On December 6, 1994 a frontal system deposited freezing rain in central Kansas that resulted in the EBBR wind instruments becoming frozen in place at two extended facilities (E4 and E8) 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 1530 GMT 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws Wind Direction: 12/06/94 1730 GMT - 12/07/94 1830 GMT 5 minute: wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
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 |
---|---|---|---|
12/31/1994 | 1330 | 01/01/1995 | 1745 |
Subject: | SGP/EBBR/E8 - Frozen Wind Speed Instrument |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On December 31, 1994 EBBR wind speed instrument froze in place from icing. Wind speeds increased sufficiently on January 1, 1995 to break the anemometer free. The wind direction instrument was not affected. The times and fields that are incorrect are shown below. 5 minute: wind_s, res_ws 12/31 1335 GMT - 1/1 1745 GMT 15 minute: wind_s 12/31 1345 GMT - 1/1 1745 GMT 30 minute: wind_s, res_ws 12/31 1400 GMT - 1/1 1800 GMT |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|
Subject: | |
DataStreams: | |
Description: | |
Measurements: |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/18/1995 | 0000 | 08/28/1995 | 2359 |
Subject: | AEM Home 30 Values Low |
DataStreams: | sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | DQR No: Platform: EBBR Subject: E8 EBBR AEM Home 30 Values Low Date Submitted: August 28, 1995 Submitted By: _x_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: EBBR/AEM What level data: (raw,a0,a1,b1,c1 etc): a1 (5 and 30 minute) a0 (15 minute) What location was the data collected at: E8, Coldwater, KS Period of time in question Begin Date 08/18/95 to present Data should be labeled: ___ questionable ___ All data fields affected ___ incorrect ___ Only some data fields affected ___ wrong calibration _X_ others Discussion of Problem: At least by August 18, 1995, the home 30 value intermittently dropped below 15, to typically a small negative number; this causes a data quality message to be output in the site operations log as the stated acceptable range for home 30 is 15 to 34.999999. However, no data is incorrect as a result of this condition. No replacement AEM is available, as the changeout kit AEMs are somewhat different from the initial units. I have requested site operations to diagnose the cause of the problem on the next PM visit and hopefully correct the problem. I will submit another DQR or addendum when successful replacement of the AEM is accomplished. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data with this comment. Data Processing Notes Date ------------------------------------------------------------------- END |
Measurements: | sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/18/1995 | 0630 | 09/05/1995 | 1800 |
Subject: | SGP/EBBR/E8 - Home 30 Values Correct |
DataStreams: | sgp30ebbrE8.a1 |
Description: | Beginning 0630 GMT on August 18, 1995, the home 30 value intermittently dropped below 15, to typically a small negative number; this causes a data quality message to be output in the site operations log as the stated acceptable range for home 30 is 15 to 34.999999. However, no data is incorrect as a result of this condition. On September 15 at 1800 GMT the home 30 signal returned to normal and has remained normal since then. This occurred without the intervention of site operations personnel. |
Measurements: | sgp30ebbrE8.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 |
---|---|---|---|
04/17/1996 | 1502 | 04/17/1996 | 1553 |
Subject: | SGP/EBBR/E8 - 3-month check |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.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: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/30/1996 | 1430 | 07/30/1996 | 2100 |
07/31/1996 | 1400 | 07/31/1996 | 1430 |
Subject: | SGP/EBBR/E8 - Annual Calibration Changeout |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On 30 July 1996 the EBBR changeout for annual calibration occurred at E8, Coldwater, KS. SEBS unit 5 was removed and unit 4 was installed. Between 1430 and 2100 GMT no data or incorrect data was collected; most of the data is missing. Data for half hours 1400-1430 GMT on 31 July is incorrect; 3 month calibration checks were being performed. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/05/1996 | 0200 | 08/07/1996 | 1445 |
08/11/1996 | 1015 | 08/11/1996 | 1045 |
08/11/1996 | 1200 | 08/11/1996 | 1845 |
08/11/1996 | 2315 | 08/11/1996 | 2330 |
08/12/1996 | 0000 | 08/12/1996 | 0200 |
08/12/1996 | 1130 | 08/12/1996 | 1900 |
08/12/1996 | 2230 | 08/14/1996 | 2200 |
08/15/1996 | 1630 | 08/15/1996 | 1730 |
08/16/1996 | 2200 | 08/20/1996 | 1945 |
Subject: | SGP/EBBR/E8 - Incorrect Right Humidity Probe Temperature |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
Description: | The temperature portion of the right humidity probe produced incorrect values during the periods indicated. No site operations intervention occurred to correct the problem. The problem has not reoccurred. The following data values are incorrect for the periods listed below: 15 minute: rr_thum_r 30 minute: hum_top, hum_bot, vp_top, vp_bot, e, h, bowen August 5: 0200-2330 6: 0000-2330 7: 0000-1445 11: 1045, 1200-1845, 2315-2330 12: 0000-0200, 1130-1900, 2230-2330 13: 0000-2330 14: 0000-2200 15: 1630-1730 16: 2200-2330 17: 0000-2330 18: 0000-2330 19: 0000-2330 20: 0000-1945 |
Measurements: | sgp15ebbrE8.a1:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/19/1996 | 0000 | 06/19/1996 | 0230 |
06/19/1996 | 0800 | 06/19/1996 | 1000 |
06/30/1996 | 0230 | 06/30/1996 | 1530 |
06/30/1996 | 2130 | 06/30/1996 | 2330 |
07/01/1996 | 0100 | 07/01/1996 | 0830 |
07/02/1996 | 0000 | 07/02/1996 | 0400 |
07/02/1996 | 0500 | 07/02/1996 | 1500 |
07/03/1996 | 0130 | 07/03/1996 | 0400 |
07/03/1996 | 1430 | 07/03/1996 | 1530 |
07/04/1996 | 0200 | 07/04/1996 | 0230 |
07/05/1996 | 0000 | 07/05/1996 | 0030 |
07/05/1996 | 0200 | 07/05/1996 | 0230 |
Subject: | SGP/EBBR/E8 - Reprocess: Soil Heat Flow Sensor 2 Incorrect Data |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
Description: | Soil heat flow sensor #2 periodically outputted incorrect values during the period indicated. The output often indicated large negative heat flow. Problems with good connections of the sensor leads have caused this problem in the past. However, no maintenance was performed before the problem ceased on 15 July 1996. No data is available for 20-27 and 29 July, so it is not known if the problem occurred during that time. The data affected (and thus incorrect) includes: 15 minute: mv_hft2 30 minute: shf2, c_shf2, g2, ave_shf, e, h. The dates and times (GMT) of incorrect values are listed below. Only half hour times are listed. 06/19/96 0230, 0800-1000 06/30/96 0230-1530, 2130-2330 07/01/96 0100-0830 07/02/96 0400, 0500-1500 07/03/96 0130-0400, 1430-1530 07/04/96 0200-0230 07/05/96 0030, 0230 The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1 and 3 through 5 to calculate the average soil heat flow, ave_shf = (g1 + g3 + g4 + g5)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp15ebbrE8.a1:
sgp30ebbrE8.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 |
---|---|---|---|
11/01/1996 | 1500 | 11/01/1996 | 1530 |
11/09/1996 | 0800 | 11/09/1996 | 0830 |
11/10/1996 | 0900 | 11/10/1996 | 0930 |
Subject: | SGP/EBBR/E8 - Incorrect Soil Moisture #1 |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
Description: | Soil Moisture probe #1 went offscale at these half hour times, for an unknown reason. This problem may reoccur, and at present is extremely intermittent. A work request has been submitted to site operations to check the soil and electrical contacts of the probe. Affected data values are: 15 minute: r_sm1 30 minute: sm1, c_shf1, ces1, cs1, g1, ave_shf, e, h |
Measurements: | sgp15ebbrE8.a1:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/03/1996 | 0300 | 08/03/1996 | 0830 |
08/03/1996 | 1400 | 08/03/1996 | 1700 |
08/03/1996 | 2030 | 08/03/1996 | 2100 |
08/05/1996 | 0230 | 08/07/1996 | 1430 |
09/20/1996 | 1030 | 09/20/1996 | 1800 |
09/20/1996 | 2100 | 09/20/1996 | 2130 |
09/20/1996 | 2230 | 09/20/1996 | 2330 |
09/21/1996 | 1500 | 09/21/1996 | 1530 |
09/21/1996 | 2330 | 09/22/1996 | 0130 |
09/22/1996 | 0530 | 09/23/1996 | 0130 |
09/23/1996 | 0400 | 09/26/1996 | 0700 |
09/26/1996 | 1900 | 09/26/1996 | 2030 |
09/27/1996 | 0100 | 09/29/1996 | 2330 |
09/30/1996 | 0000 | 09/30/1996 | 1930 |
09/30/1996 | 2130 | 10/07/1996 | 0530 |
10/07/1996 | 1400 | 10/07/1996 | 1830 |
10/07/1996 | 2000 | 10/15/1996 | 1900 |
Subject: | SGP/EBBR/E8 - Incorrect Soil Moisture #2, Soil Temperature #2 |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
Description: | Soil Moisture probe #2 and soil temperature probe #2 went offscale at times soon after installation of a new EBBR unit at E8. The problem may have been poor soil contact to the probes or poor electrical contact at the j- panel. No site operation intervention occurred to correct the problem; the problem has not reoccurred since 15 October 1996. Affected data values were: 15 minute: r_sm2, rr_ts2 30 minute: sm2, ts2, c_shf2, ces2, cs2, g2, ave_shf, e, h The affected times (GMT) and dates are listed below: Aug 3: 0300-0830, 1400-1700, 2030-2100 5: 0230-2330 6: 0000-2330 7: 0000-1430 Sep 20: 1030-1800, 2130, 2230-2330 21: 1530, 2330 22: 0000-0130, 0530-2330 23: 0000-0130, 0400-2330 24: 0000-2330 25: 0000-2330 26: 0000-0700, 1900-2030 27: 0100-2330 28: 0000-2330 29: 0000-2330 30: 0000-1930, 2130-2330 Oct 1: 0000-2330 2: 0000-2330 3: 0000-2330 4: 0000-2330 5: 0000-2330 6: 0000-2330 7: 0000-0530, 1400-1830, 2000-2330 8: 0000-2330 9: 0000-2330 10: 0000-2330 11: 0000-2330 12: 0000-2330 13: 0000-2330 14: 0000-2330 15: 0000-1900 |
Measurements: | sgp15ebbrE8.a1:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/03/1996 | 0000 | 06/10/1997 | 2200 |
Subject: | SGP/EBBR/E8 - Incorrect Soil Temperature #s 1 and 2 |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
Description: | Soil temperature probes #1 and #2 went offscale at times for many months. Replacement probes were not available until recently. The probes were replaced on 16 June, 1997 at 2200 GMT. Affected data values were: 15 minute: r_sm1, r_sm2, rr_ts1, rr_ts2 30 minute: sm1, sm2, ts1, ts2, c_shf1, c_shf2, ces1, ces2, cs1, cs2, g1, g2, ave_shf, e, h |
Measurements: | sgp15ebbrE8.a1:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/15/1997 | 1500 | 06/24/1997 | 2000 |
Subject: | SGP/EBBR/E8 - Incorrect Soil Temperature #s 1 and 2 |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
Description: | Soil temperature probes #1 and #2 were replaced on June 10, 1997. However, the leads were apparently not connected tightly enough, resulting in some large or offscale resistance measurements and therefore temperature values for those probes. The problem occurred only occasionally until June 20, 1997. On June 20 - 24, 1997 probes 1 and 2 outputs were offscale for several hours per day, both not always at the same time. On June 24, 1997, site operations checked and tightened the connections. No offscale values have occurred since then. Affected data values were: 15 minute: r_sm1, r_sm2, rr_ts1, rr_ts2 30 minute: sm1, sm2, ts1, ts2, c_shf1, c_shf2, ces1, ces2, cs1, cs2, g1, g2, ave_shf, e, h |
Measurements: | sgp15ebbrE8.a1:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/19/1997 | 0130 | 07/08/1997 | 1915 |
Subject: | SGP/EBBR/E8 - AEM Inoperative |
DataStreams: | sgp30ebbrE8.a1 |
Description: | Beginning on 19 June 1997, the set screw holding one of the AEM sprockets to the drive motor became stripped, preventing the aspirator units from exchanging every time. The problem was intermittent until 24 June when site operations personnel determined that a new sprocket (therefore a replacement AEM) was needed. The AEM was therefore left in the position such that the right aspirator was in the bottom position continuously, with home signals indicating values near -1. The AEM was replaced on 8 July 1997. For most of the time period above, home signals, bowen, e, h, and all thermocouple and probe tmperatures, probe relative humidities, and vapor pressures do not reflect a switching AEM. However, temperatures, RH and vapor pressures are accurate for their height. Obviously, bowen, e, and h are incorrect. |
Measurements: | sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/10/1997 | 2030 | 07/14/1997 | 0915 |
Subject: | SGP/EBBR/E8 - Reprocess: E8 EBBR Program Compile Error, Effect On Net Radiation |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | An error in CR10X program compilation occurred when new software was used to perform the compilation. The new software created an erroneous data table listing, which the program works off of. An incorrect data location was used in the adjustment of net radiation for wind speed, causing all net radiation values to be divided by 2. The following data was incorrect during the period above: 5 minute: q 15 minute: mv_q 30 minute: q, e, h The latent and sensible heat fluxes can be corrected by recomputing as follows: e = -(2q + ave_shf)/(1 + bowen) h = -(e + ave_shf + 2q) |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/14/1997 | 0915 | 08/05/1997 | 2300 |
Subject: | E8 EBBR Lightning Strike |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | DQR No: Platform: EBBR Subject: E8 EBBR Lightning Strike Date Submitted: October 16, 1997 Submitted By: _x_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other Platform/Measurement: EBBR/Numerous What level data: (raw,a0,a1,b1,c1 etc): a1 (15 and 30 minute) a0 (5 minute) What location was the data collected at: E8, Coldwater, KS Period of time in question Begin Date 07/14/97 Time 0915 GMT End Date 08/05/97 Time 2300 GMT Discussion of Problem: A lightning "strike" to the EF 8 Facility shortly after 0900 GMT on 14 July 1997 caused the failure of several EBBR sensors, the solar panel voltage regulator, and the CR10X datalogger. All data is missing for the period above, with degraded operations thereafter for a couple of months while replacement parts slowly became available (a separate DQR will cover the degraded data period). |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/05/1997 | 2330 | 10/15/1997 | 1830 |
Subject: | SGP/EBBR/E8 - Reprocess: E8 EBBR Lightning Strike / sensor Replacements |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | DQR No: Platform: EBBR Subject: E8 EBBR Lightning Strike Date Submitted: October 17, 1997 Submitted By: _x_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other Platform/Measurement: EBBR/Numerous What level data: (raw,a0,a1,b1,c1 etc): a1 (15 and 30 minute) a0 (5 minute) What location was the data collected at: E8, Coldwater, KS Period of time in question Begin Date 08/05/97 Time 2330 GMT End Date 10/15/97 Time 1830 GMT Discussion of Problem: A lightning "strike" to the EF 8 Facility shortly after 0900 GMT on 14 July 1997 caused the failure of several EBBR sensors, the solar panel voltage regulator, and the CR10 datalogger. A previous DQR indicated this. During the period listed above, all but one of the damaged parts were replaced. Replacements occurred on 22 July, 5 August, 19 August, and 16 September. Some sensors began producing correct data immediately after their replacement; however the temperature measurements were incorrect until 15 October, when the reference temperature probe, with which they are corrected, was reconnected. Only the soil heat flow probe #2 remains to be replaced. Average soil, sensible, and latent heat fluxes are therefore now ,still, incorrect, but can be recomputed using only four sets of soil heat flow probes, as below. ave_shf = (g1 +g3 + g4 + g5)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.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 |
---|---|---|---|
07/14/1997 | 0900 | 10/29/1997 | 2000 |
Subject: | SGP/EBBR/E8 - Reprocess: SHF2 Incorrect |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
Description: | Soil heat flow probe #2 outputted incorrect, large positive values during the period indicated. Replacement of the probe on 29 October 1997 corrected the problem. The serial number of the probe replaced is 923025 and of the replacement probe is 923110. The data affected (and thus incorrect) includes: 15 minute: mv_hft2 30 minute: shf2, c_shf2, g2, ave_shf, e, h. The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1, and 3 through 5 to calculate the average soil heat flow, ave_shf = (g1 + g3 + g4 + g5)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp15ebbrE8.a1:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|
Subject: | |
DataStreams: | |
Description: | |
Measurements: |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/04/1997 | 0000 | 01/06/1998 | 1840 |
Subject: | SGP/EBBR/E8 - Battery Low - Data Affected |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | The battery condition deteriorated over time so that the solar panel and AC charger were not always able to keep the battery voltage high enough to produce correct data after 3 December 1997, especially at night. The condition became particularly bad after 8 December 1997. Data for conditions of battery voltage below 10.4 volts should be considered incorrect; inspection of the battery voltage data is required to determine this. The battery was replaced on 6 January 1998 at 1840 GMT, after which data was again correct. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1997 | 1900 | 10/29/1997 | 2010 |
Subject: | SGP/EBBR/E8 - Reprocess: E8 Soil Heat Flow #2 Failure - Replaced |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1 |
Description: | Soil heat flow probe #2 values were positive and in the thousands after an apparently catastrophic failure at 1900 GMT on 11 October 1997. The probe was replaced on 29 October 1997 at 2010 GMT. The data affected (and thus incorrect) includes: 15 minute: mv_hft2 30 minute: shf2, c_shf2, g2, ave_shf, e, h. The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1 and 3 through 5 to calculate the average soil heat flow, ave_shf = (g1 + g3 + g4 + g5)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q). |
Measurements: | sgp15ebbrE8.a1:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/14/1998 | 0745 | 01/14/1998 | 1600 |
Subject: | SPG/EBBR/E8 - Wind Speed Sensor and AEM Frozen |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | The Automatic Exchange Mechanism was frozen during the entire period and did not exchange. Data values that were affected by the inoperative AEM are: 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, e, h, bowen The wind speed sensor was frozen stalled during part of this period (1100-1600 GMT). Data values that were affected are: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/14/1998 | 1820 | 03/15/1998 | 1625 |
Subject: | SGP/EBBR/E8 - Wind Speed Frozen |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | During the period above 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: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/16/1998 | 1530 | 03/16/1998 | 1830 |
Subject: | SGP/EBBR/E8 - Wind Speed Frozen |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | During the period above 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: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/17/1998 | 1510 | 03/17/1998 | 1555 |
Subject: | SGP/EBBR/E8 - Wind Speed Frozen |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | During the period above 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: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/29/1997 | 1930 | 10/29/1997 | 2125 |
Subject: | SGP/EBBR/E8 - 3-Month Check |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.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: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/14/1997 | 2130 | 05/12/1998 | 1850 |
Subject: | EBBR E8 Net Radiation Data Quality |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On 14 July 1997 lightning struck the EBBR at E8. A number of sensors and components needed to be replaced. One component that was not replaced, a J-panel, suffered some damage that was not obvious at the time. Also, changes in sensors eventually required a change in the CR10 program to accomodate new calibration factors. A new program was installed on 14 October. Unfortunately, an incorrect nighttime calibration for the net radiation was contained in the new program provided by the EBBR vendor REBS. The calibration problem will be covered in a separate DQR. The J-panel problem began to surface on 14 October as well, with most net radiation values being smaller than correct values during the day, and large negative at night; the latter was partially from the J-panel problem and partially from the incorrect nighttime calibration. All net radiation values, nighttime and daytime from 14 October 1997 through 12 May 1998 need to be examined carefully (and compared with other nearby sites) to determine if they are correct, and nighttime values need to be corrected. Much of the latent and sensible heat flux data is corrupted by both problems. The correction to nightime values will be covered in two subsequent DQRs, as two net radiometers, with different calibrations, have been used at E8 since 14 October 1997. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/28/1998 | 1958 | 04/28/1998 | 2031 |
Subject: | SGP/EBBR/E8 - Six Month Checks |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.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: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/14/1997 | 2200 | 04/20/1998 | 1720 |
Subject: | EBBR E8 Adjustment of Negative Net Radiation Values |
DataStreams: | sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | Please see DQR D980526.2 for some background information on the cause of the problem described here. On 14 October 1997 a new CR10 program was installed at E8 EBBR. The program contained the wrong calibration coefficient for negative net radiations. A multiplier had been left out of the computation of the coefficient by the vendor. All negative net radiation values during the stated period need to be DIVIDED by 13.88. Only the 5 minute and 30 minute q values are affected. The 15 minute mv_q values are correct. Other values affected are 30 minute h and e, which would need to be recalculated from: e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/20/1998 | 1725 | 05/26/1998 | 1920 |
Subject: | EBBR E8 Adjustment of Negative Net Radiation Values |
DataStreams: | sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | Please see DQR D980526.2 for some background information on the cause of the problem described here, and D980603.1 for correction to the data obtained with the previous net radiometer. On 14 October 1997 a new CR10 program was installed at E8 EBBR. The program contained the wrong calibration coefficient for negative net radiations. A multiplier had been left out of the computation of the coefficient by the vendor. On 20 April 1998 a new net radiometer was installed. It was not noticed that the mutiplier was missing. A slightly different calibration was entered for the net radiometer, again without the multiplier applied. A few weeks later the mentor, in trying to diagnose the obvious incorrect negative net radiation values, discovered the missing multiplier. A new program with the multiplier included was installed on 26 May 1998 at 1917 GMT. All negative net radiation values during the stated period above need to be DIVIDED by 13.775. Only the 5 minute and 30 minute q values are affected. The 15 minute mv_q values are correct. Other values affected are 30 minute h and e, which would need to be recalculated from: e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/24/1998 | 0300 | 05/26/1998 | 1700 |
Subject: | SGP/EBBR/E8 - Wind Direction Incorrect |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | The wind direction sensor showed the usual failure signature much of the time, an output of 135 degrees, beginning on 24 May 1998. Not all times showed 135 degrees, but all wind direction data during the stated period should be considered incorrect. The values affected are: 5 minute: res_ws, wind_d, sigma_d 15 minute: mv_wind_d 30 minute: res_ws, wind_d, sigma_d |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/20/1998 | 1505 | 12/22/1998 | 1800 |
Subject: | SGP/EBBR/E8 - Wind Direction and Speed Data Incorrect |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | The wind direction and speed sensors were iced stopped by freezing rain, resulting in the following values being incorrect: 5 minute: wind_s, res_ws, wind_d, sigma_wd 15 minute: wind_s, mv_wind_d 30 minute: wind_s, res_ws, wind_d, sigma_wd |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/08/1999 | 0835 | 01/08/1999 | 1500 |
Subject: | SGP/EBBR/E8 - Wind Speed Data Incorrect |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.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: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/28/1999 | 1605 | 01/29/1999 | 0830 |
Subject: | SGP/EBBR - EBBR E8 Wind Speed Iced, Data Incorrect |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.00, sgp5ebbrE8.a0 |
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: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp5ebbrE8.00:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/28/1999 | 1530 | 02/02/1999 | 1800 |
Subject: | SGP/EBBR/E8 - Wind Direction Incorrect |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | The wind direction sensor output read 135 degrees for much of the period, an indication of sensor failure. Energy Balance fluxes are not affected by the problem. The values below were incorrect when wind direction was 135: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, sigma_wd |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/30/1999 | 0220 | 01/31/1999 | 2030 |
Subject: | SGP/EBBR/E8 - Wind Speed Incorrect |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.00, sgp5ebbrE8.a0 |
Description: | The wind speed sensor was iced stopped for the period. Energy Balance fluxes are not affected by the problem. The values below were incorrect for the period: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp5ebbrE8.00:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/12/1999 | 0955 | 03/14/1999 | 1800 |
Subject: | SGP/EBBR/E8 - Wind Speed Frozen |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | Wind speed and residual wind speed during this period are incorrect caused by an ice storm. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|