| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000221.8 | SGP/EBBR - EBBR E12 Anemometer Cups Frozen, Wind Speed Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D000225.10 | SGP/EBBR - EBBR E12 Net Radiation Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D000301.1 | SGP/EBBR - EBBR E12 Net Radiation Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D010213.1 | SGP/EBBR/E12 - EBBR E12 Wind Speed Iced | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D010213.2 | SGP/EBBR/E12 - EBBR E12 Wind Speed Iced | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D010402.13 | SGP/EBBR/E12 - E12 EBBR Wind Direction Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D010402.14 | SGP/EBBR/E12 - E12 EBBR Wind Speed Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D010402.16 | SGP/EBBR/E12 - E12 EBBR AEM Stuck - Data Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D011127.26 | SGP EBBR E12 - E12 EBBR Data Incorrect During 6 Month Checks | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D011207.11 | SGP EBBR E12 - E12 EBBR Data Incorrect From AEM In One Position | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D020628.1 | SGP/EBBR/E12 - 3-month Check | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D020628.15 | SGP/EBBR/E12 - T/RH Check | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D020716.11 | SGP/EBBR/E12 - 6 Month Checks | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D020717.10 | SGP/EBBR/E12 - AEM Hung | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D020717.11 | SGP/EBBR/E12 - Measurements Incorrect | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.00, sgp5ebbrE12.a1 |
| D020717.12 | SGP/EBBR/E12 - Resistance Measurements Incorrect | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D020717.6 | SGP/EBBR/E12 - Reprocess: Soil Temperature #3 Incorrect | sgp30ebbrE12.a1, sgp30ebbrE12.b1 |
| D020717.7 | SGP/EBBR/E12 - Wind Direction Incorrect | sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D020717.8 | SGP/EBBR/E12 - Reprocess: Soil Moisture 4 and 5 Incorrect | sgp30ebbrE12.a1, sgp30ebbrE12.b1 |
| D020717.9 | SGP/EBBR/E12 - Reprocess: Soil Moisture 2 and 5 Incorrect | sgp30ebbrE12.a1, sgp30ebbrE12.b1 |
| D021113.1 | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header | sgp30ebbrE12.b1, sgp30ebbrE13.b1, sgp30ebbrE15.b1, sgp30ebbrE18.b1, sgp30ebbrE19.b1, sgp30ebbrE2.b1, sgp30ebbrE20.b1, sgp30ebbrE22.b1, sgp30ebbrE26.b1, sgp30ebbrE4.b1, sgp30ebbrE7.b1, sgp30ebbrE8.b1, sgp30ebbrE9.b1 |
| D021113.4 | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header | sgp30ebbrE12.a1, sgp30ebbrE13.a1, sgp30ebbrE15.a1, sgp30ebbrE20.a1, sgp30ebbrE22.a1, sgp30ebbrE26.a1, sgp30ebbrE4.a1, sgp30ebbrE7.a1, sgp30ebbrE8.a1, sgp30ebbrE9.a1 |
| D030110.33 | SGP/EBBR/E12 - Data Incorrect during 6 month checks | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D030114.11 | SGP/EBBR/E12 - Resistance-based Measurements Incorrect | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D030114.12 | SGP/EBBR/E12 - Wind Direction Incorrect | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D030114.13 | SGP/EBBR/E12 - Data zero following Logger Restart | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D030114.14 | SGP/EBBR/E12 - Battery Voltage Low | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D030114.19 | SGP/EBBR/E12 - AEM Stuck in One Position | sgp30ebbrE12.a1, sgp30ebbrE12.b1 |
| D030115.2 | SGP/EBBR/E12 - REPROCESS: Net Rad Calibration Coefficients | sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D030115.3 | SGP/EBBR/E12 - Data Mostly Zero Following Logger Restart | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D030711.21 | SGP/EBBR/E12 - AEM Hung Inbetween Home Positions | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D030712.16 | SGP/EBBR/E12 - 6 Month Checks | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D031031.4 | SGP/EBBR/E12 - Water in Net Radiometer, Surface Fluxes Incorrect | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D031124.12 | SGP/EBBR/E12 - Pressure Sensor Measurement Scales With Battery Voltage | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D031204.9 | SGP/EBBR/E12 - 6 Month Checks | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D031217.4 | SGP/EBBR/E12 - Pressure Sensor Measurement Scales With Battery Voltage | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| D031222.15 | SGP/EBBR/E12 - Wind Speed Sensor Frozen By Ice Storm | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D040304.10 | SGP/EBBR/E12 - Wind Speed Frozen Stopped By Ice | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D040304.11 | SGP/EBBR/E12 - Wind Direction Frozen Stopped By Ice | sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D040615.3 | SGP/EBBR/E12 - Incorrect Times | sgp15ebbrE12.b1, sgp30baebbrE12.c1, sgp30ebbrE12.b1, sgp5ebbrE12.b1, sgpebbrE12.00 |
| D041222.11 | SGP/EBBR/E12 - 6 Month Checks | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D041222.2 | SGP/EBBR/E12 - AEM home_15 Incorrect, Flux Measurements not affected | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D050206.9 | SGP/EBBR/E12 - Wind Speed Frozen Stopped By Ice Storm | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D050207.5 | SGP/EBBR/E12 - Wind Direction Frozen Stopped By Ice Storm | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D050215.16 | SGP/EBBR/E12 - Wind Speed Frozen Stopped By Ice | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D050215.17 | SGP/EBBR/E12 - Wind Direction Frozen Stopped By Ice | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D050304.1 | SGP/EBBR/E12 - Wind Speed and Direction Frozen by Ice Storm | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D050719.9 | SGP/EBBR/E12 - Improved EBBR CR10 Program | sgp30ebbrE12.b1 |
| D051106.23 | SGP/EBBR/E12 - Average Soil Heat Flux Incorrect | sgp30ebbrE12.b1 |
| D051111.10 | SGP/EBBR/E12 - metadata corrections | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D060111.5 | SGP/EBBR/E12 - Sensible and Latent Heat Fluxes Incorrect at Times | sgp15ebbrE12.b1, sgp30ebbrE12.b1 |
| D060111.8 | SGP/EBBR/E12 - Multiplexer failure | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D060501.11 | SGP/EBBR/E12 - Fluxes and Gradient Measurements Incorrect | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D060921.3 | SGP/EBBR/E12 - Net Radiation, and Sensible and Latent Heat Fluxes Incorrect | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| D060921.4 | SGP/EBBR/E12 - Soil Temperature #1 Incorrect | sgp15ebbrE12.b1, sgp30ebbrE12.b1 |
| D940106.2 | SGP/EBBR/E12 - Invalid data due to blown AEM fuse at E12 | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D940616.3 | SGP/EBBR/E12 - Wind Direction | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D940711.3 | SGP/EBBR/E12 - Aspirator Failure | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D940808.2 | SGP/EBBR/E12 - Stopped Ventilation Fan | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D940909.1 | SGP/EBBR/E12 - Miscellaneous Problems Affecting Data | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D941021.12 | SGP/EBBR/E12 - Net Radiometer Hemisphere Changes | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D941021.6 | SGP/EBBR/E12 - Low home_15 Values | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D950626.15 | SGP/EBBR/E12 - Wind Direction Malfunction | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D950626.16 | SGP/EBBR/E12 - Wind Direction Malfunction | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D950719.2 | SGP/EBBR/E12 - Wind Direction Malfunction | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D950816.2 | SGP/EBBR/E12 - AEM Failure | sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D950908.3 | SGP/EBBR/E12 - Wind Direction Malfunction | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D950921.3 | SGP/EBBR/E12 - AEM replacement | sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D951127.3 | SGP/EBBR/E12 - AEM Failure/Right Radiation Shield OFF | sgp30ebbrE12.a1 |
| D960320.3 | SGP/EBBR/E12 - Wind Speed Cups Frozen | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D960508.5 | SGP/EBBR/E12 - 3-month check | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D961122.23 | SGP/EBBR/E12 - EBBR 3 Month Checks - 10 EFs | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D961122.3 | SGP/EBBR/E12 - Annual Calibration Changeout | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D961122.8 | SGP/EBBR/E12 - Left Air Temperature Thermocouple Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D961122.9 | SGP/EBBR/E12 - Battery Voltage Low - Fluxes Affected | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D970401.1 | Controlled burn at E12 on 3/20/97 and affected data | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0, sgpsirosE12.a1 |
| D970730.2 | SGP/EBBR/E12 - Wind Direction Sensor Malfunctions | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D971021.4 | SGP/EBBR/E12 - EBBR Biannual Checks | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D980117.17 | SGP/EBBR/E12- EBBR Frozen Wind Speed | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D980117.26 | SGP/EBBR/E12 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown) | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D980117.32 | SGP/EBBR/E12 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D980117.6 | SGP/EBBR/E12 - AEM Failure and Replacement | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D980416.11 | SGP/EBBR/E12 - 3-Month Check | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D980528.13 | SGP/EBBR/E12 - Wind Direction Sensor Failure | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D980529.9 | SGP/EBBR/E12 - Six Month Checks | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D990127.21 | SGP/EBBR/E12 - Wind Direction Data Incorrect (revised) | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D990128.1 | SGP/EBBR/E12 - Wind Speed Data Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D990128.2 | SGP/EBBR - EBBR E12 Wind Speed Data Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.00, sgp5ebbrE12.a0 |
| D990129.1 | SGP/EBBR - EBBR E12 Wind Speed Data Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.00, sgp5ebbrE12.a0 |
| D990129.2 | SGP/EBBR/E12 - Data Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.00, sgp5ebbrE12.a0 |
| D990129.3 | SGP/EBBR/E12 - Temperature, RH, and Vapor Pressure Data Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D990129.4 | SGP/EBBR/E12 - All Temperature Measurements Incorrect | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| D990622.4 | SGP/EBBR/E12 - RH top Data Zero | sgp30ebbrE12.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/21/1999 | 0000 | 12/21/1999 | 1320 |
| Subject: | SGP/EBBR - EBBR E12 Anemometer Cups Frozen, Wind Speed Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The anemometer cups were frozen stalled during this period. The following values were therefore incorrect: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/17/1999 | 1700 | 12/27/1999 | 1845 |
| Subject: | SGP/EBBR - EBBR E12 Net Radiation Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | Condensation inside the domes (possibly water in the bottom dome also) during the period made daytime net radiation values as much as 50% too large and nighttime net radiations as much as 100% too small. The affected data are: 5 minute: q 15 minute: mv_q 30 minute: q, h, e |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/09/1999 | 0700 | 12/14/1999 | 1500 |
| Subject: | SGP/EBBR - EBBR E12 Net Radiation Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/11/2000 | 0130 | 12/15/2000 | 1630 |
| Subject: | SGP/EBBR/E12 - EBBR E12 Wind Speed Iced |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The anemometer was frozen stopped by freezing rain; the indicated data is incorrect. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/18/2000 | 0730 | 12/18/2000 | 1115 |
| Subject: | SGP/EBBR/E12 - EBBR E12 Wind Speed Iced |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The anemometer was frozen stopped by freezing rain; the indicated data is incorrect. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/18/2000 | 0645 | 12/18/2000 | 1101 |
| Subject: | SGP/EBBR/E12 - E12 EBBR Wind Direction Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The wind direction vane was frozen stopped in one direction by icing. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/18/2000 | 0645 | 12/18/2000 | 1101 |
| Subject: | SGP/EBBR/E12 - E12 EBBR Wind Speed Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The wind speed sensor cups were frozen stopped by icing. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/01/2000 | 0000 | 02/08/2000 | 1531 |
| Subject: | SGP/EBBR/E12 - E12 EBBR AEM Stuck - Data Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The AEM became stuck between levels, causing all gradient measurements to be incorrect, and thus the latent and sensible heat fluxes and Bowen ratio. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/03/2001 | 1625 | 04/03/2001 | 1716 |
| 10/18/2001 | 1930 | 10/18/2001 | 2116 |
| Subject: | SGP EBBR E12 - E12 EBBR Data Incorrect During 6 Month Checks |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | The data was incorrect during the 6 month checks. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/06/2001 | 2030 | 04/11/2001 | 1731 |
| 04/16/2001 | 1900 | 04/17/2001 | 1631 |
| 04/17/2001 | 2330 | 04/18/2001 | 1631 |
| 04/18/2001 | 2100 | 04/20/2001 | 1301 |
| 04/20/2001 | 2130 | 04/21/2001 | 0931 |
| 04/21/2001 | 2030 | 04/26/2001 | 1501 |
| 04/27/2001 | 0030 | 05/01/2001 | 1431 |
| Subject: | SGP EBBR E12 - E12 EBBR Data Incorrect From AEM In One Position |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | The AEM kept stopping in one position. Offset biases are not removed from the gradient data in this situation and the data indicated is therefore incorrect. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/14/1995 | 1400 | 10/14/1995 | 1700 |
| Subject: | SGP/EBBR/E12 - 3-month Check |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/23/1994 | 1515 | 11/23/1994 | 1630 |
| Subject: | SGP/EBBR/E12 - T/RH Check |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: 1515, 1520, 1525, 1530, 1535, 1540, 1545, 1550, 1555,
1600, 1605, 1610
15 minute: 1515, 1530, 1545, 1600, 1615
30 minute: 1530, 1600, 1630
(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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/30/2002 | 1540 | 04/30/2002 | 1611 |
| Subject: | SGP/EBBR/E12 - 6 Month Checks |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | The indicated measurements were incorrect during the 6 month checks. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/30/2002 | 0430 | 02/06/2002 | 1646 |
| Subject: | SGP/EBBR/E12 - AEM Hung |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | The automatic exchange mechanism did not exchange properly, causing other measurements to be incorrect. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/12/2002 | 1430 | 06/12/2002 | 1501 |
| Subject: | SGP/EBBR/E12 - Measurements Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.00, sgp5ebbrE12.a1 |
| Description: | All measurements were incorrect or offscale for an unknown reason. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.00:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/28/2002 | 1800 | 07/07/2002 | 2356 |
| Subject: | SGP/EBBR/E12 - Resistance Measurements Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | All sensors that depend on resistance measurements are incorrect. Average soil heat flow, sensible heat flux, and latent heat flux are incorrect as a result. This condition normally occurs when the reference temperature sensor is disconnected or bad. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/01/2001 | 0000 | 06/20/2002 | 1231 |
| Subject: | SGP/EBBR/E12 - Reprocess: Soil Temperature #3 Incorrect |
| DataStreams: | sgp30ebbrE12.a1, sgp30ebbrE12.b1 |
| Description: | Soil Temperature #3 was flaky primarily during nighttime hours and sometimes during early
daylight hours. Average soil heat flow, sensible heat flux, and latent heat flux are
also affected; these can be recalculated using the remaining good sets of soil sensors as
follows:
The heat fluxes can be recalculated by using soil sets 1, 2, 4, and 5 as follows:
ave_shf = (g1 + g2 + g4 + g5)/4
e = -(q + ave_shf)/(1 + bowen)
h = -(q + e + ave_shf) |
| Measurements: | sgp30ebbrE12.a1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/25/2002 | 2230 | 06/30/2002 | 2356 |
| Subject: | SGP/EBBR/E12 - Wind Direction Incorrect |
| DataStreams: | sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | The wind direction measurement was zero, in the 50s, or always less than 180 degrees. A DQPR has been issued to resolve the problem. |
| Measurements: | sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/30/2002 | 1200 | 01/30/2002 | 1201 |
| Subject: | SGP/EBBR/E12 - Reprocess: Soil Moisture 4 and 5 Incorrect |
| DataStreams: | sgp30ebbrE12.a1, sgp30ebbrE12.b1 |
| Description: | Soil moisture measurements from sets 4 and 5 were incorrect, leading to many other
incorrect measurements calculated using them.
Average soil heat flow, sensible heat flux, and latent heat flux are affected; these can
be recalculated using the remaining good sets of soil sensors as follows:
ave_shf = (g1 + g2 + g3)/3
e = -(q + ave_shf)/(1 + bowen)
h = -(q + e + ave_shf)
Note: D020717.6 reports Soil temperature sensor #3 was also bad during this
time, but for the very specific records affected by the soil moisture #4 and
#5 reporting incorrectly, soil temp #3 was okay. Therefore the equations
given are correct. |
| Measurements: | sgp30ebbrE12.a1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/30/2002 | 1430 | 01/30/2002 | 1431 |
| Subject: | SGP/EBBR/E12 - Reprocess: Soil Moisture 2 and 5 Incorrect |
| DataStreams: | sgp30ebbrE12.a1, sgp30ebbrE12.b1 |
| Description: | Soil moisture measurements from sets 2 and 5 were incorrect, leading to many other
incorrect measurements calculated using them.
Average soil heat flow, sensible heat flux, and latent heat flux are affected; these can
be recalculated using the remaining good sets of soil sensors as follows:
ave_shf = (g1 + g3 + g4)/3
e = -(q + ave_shf)/(1 + bowen)
h = -(q + e + ave_shf)
Note: D020717.6 reports Soil temperature sensor #3 was also bad during this
time, but for the very specific records affected by the soil moisture #2 and
#5 reporting incorrectly, soil temp #3 was okay. Therefore the equations
given are correct. |
| Measurements: | sgp30ebbrE12.a1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/01/2001 | 0000 | 06/18/2003 | 2359 |
| Subject: | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR |
| DataStreams: | sgp30ebbrE12.b1, sgp30ebbrE13.b1, sgp30ebbrE15.b1, sgp30ebbrE18.b1, sgp30ebbrE19.b1, sgp30ebbrE2.b1, sgp30ebbrE20.b1, sgp30ebbrE22.b1, sgp30ebbrE26.b1, sgp30ebbrE4.b1, sgp30ebbrE7.b1, sgp30ebbrE8.b1, sgp30ebbrE9.b1 |
| Description: | The units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in the EBBR 30 minute netcdf header have been incorrect from the beginning of processing the data into netcdf files. The correct units are MJ/m^3/C. This does not affect the data quality. |
| Measurements: | sgp30ebbrE8.b1:
sgp30ebbrE4.b1:
sgp30ebbrE9.b1:
sgp30ebbrE18.b1:
sgp30ebbrE26.b1:
sgp30ebbrE13.b1:
sgp30ebbrE7.b1:
sgp30ebbrE12.b1:
sgp30ebbrE19.b1:
sgp30ebbrE2.b1:
sgp30ebbrE22.b1:
sgp30ebbrE20.b1:
sgp30ebbrE15.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/1993 | 0000 | 06/18/2003 | 2359 |
| Subject: | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR |
| DataStreams: | sgp30ebbrE12.a1, sgp30ebbrE13.a1, sgp30ebbrE15.a1, sgp30ebbrE20.a1, sgp30ebbrE22.a1, sgp30ebbrE26.a1, sgp30ebbrE4.a1, sgp30ebbrE7.a1, sgp30ebbrE8.a1, sgp30ebbrE9.a1 |
| Description: | The units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in the EBBR 30 minute netcdf header have been incorrect from the beginning of processing the data into netcdf files. The correct units are MJ/m^3/C. This does not affect the data quality. (NOTE: The actual begin date of some of these data streams is as early as 7/4/93. This DQR applies to all 30m EBBR data.) |
| Measurements: | sgp30ebbrE4.a1:
sgp30ebbrE22.a1:
sgp30ebbrE12.a1:
sgp30ebbrE7.a1:
sgp30ebbrE20.a1:
sgp30ebbrE15.a1:
sgp30ebbrE9.a1:
sgp30ebbrE26.a1:
sgp30ebbrE8.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/20/2002 | 1600 | 08/20/2002 | 1630 |
| 11/25/2002 | 1815 | 11/25/2002 | 1845 |
| Subject: | SGP/EBBR/E12 - Data Incorrect during 6 month checks |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | Some of the measurements are incorrect during the 6 month checks. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/08/2002 | 0000 | 07/09/2002 | 1330 |
| Subject: | SGP/EBBR/E12 - Resistance-based Measurements Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | When the Reference Temperature in the EBBR enclosure is not reported correctly, it affects all resistance-based measurements that are adjusted with the temperature of the reference junction. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/01/2002 | 0000 | 07/12/2002 | 1800 |
| Subject: | SGP/EBBR/E12 - Wind Direction Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | The wind direction and residual wind speed measurements are incorrect. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/23/2002 | 1700 | 07/23/2002 | 1729 |
| 08/16/2002 | 1600 | 08/16/2002 | 1629 |
| 09/03/2002 | 1700 | 09/03/2002 | 1729 |
| Subject: | SGP/EBBR/E12 - Data zero following Logger Restart |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | Most of the measurements were zero, which normally happens after a datalogger restart. The restart on 08/16/02 occurred after an EBBR unit changeout. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/09/2002 | 0000 | 10/29/2002 | 1830 |
| Subject: | SGP/EBBR/E12 - Battery Voltage Low |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | Normally, when Battery Voltage drops below 10.5 volts, most measurements are suspect and some are often incorrect. In this particular case, some of the data is suspect when the battery voltage is below 11.0 volts. Soil Heat Flow #3 is normally affected first, with other measurements following at lower voltages. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/31/2002 | 0700 | 11/12/2002 | 1730 |
| 11/25/2002 | 1830 | 11/25/2002 | 1900 |
| Subject: | SGP/EBBR/E12 - AEM Stuck in One Position |
| DataStreams: | sgp30ebbrE12.a1, sgp30ebbrE12.b1 |
| Description: | When the AEM (Automatic Exchange Mechanism) is hung at a home position, the gradients of temperature and relative humidity, and thus sensible and latent heat fluxes, are incorrect. |
| Measurements: | sgp30ebbrE12.a1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/16/2002 | 1720 | 12/10/2002 | 1720 |
| Subject: | SGP/EBBR/E12 - REPROCESS: Net Rad Calibration Coefficients |
| DataStreams: | sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | The Net Radiometer coefficients were incorrect in the CR10 program when the replacement EBBR unit was installed on 08/16/02. The data can be easily corrected; see the Suggestion area below. |
| Measurements: | sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/10/2002 | 1700 | 12/10/2002 | 1729 |
| Subject: | SGP/EBBR/E12 - Data Mostly Zero Following Logger Restart |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | Most of the measurements were zero, which normally happens after a datalogger restart. The restart on 12/10/02 occurred after a CR10 program change of net radiometer coefficients and subsequent restart of the CR10. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/2003 | 0000 | 01/10/2003 | 1630 |
| 02/06/2003 | 1730 | 02/18/2003 | 1715 |
| 02/23/2003 | 1530 | 03/04/2003 | 1645 |
| 04/15/2003 | 1645 | 04/15/2003 | 1700 |
| Subject: | SGP/EBBR/E12 - AEM Hung Inbetween Home Positions |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | The AEM was hung inbetween home positions, causing many measurements to be incorrect. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/15/2003 | 1630 | 04/15/2003 | 1700 |
| Subject: | SGP/EBBR/E12 - 6 Month Checks |
| DataStreams: | sgp15ebbrE12.a1, sgp15ebbrE12.b1, sgp30ebbrE12.a1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | Many measurements were incorrect while the AEM was positioned with both aspirators at the same height for comparison checks. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.a1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/14/2003 | 0130 | 10/14/2003 | 1800 |
| Subject: | SGP/EBBR/E12 - Water in Net Radiometer, Surface Fluxes Incorrect |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | The net radiometer top dome was punctured by migrating birds. This alone does not cause incorrect net radiation measurements. However, when it subsequently rains, water collects in the bottom dome, causing the net radiation measurements to be too large during the day and too small at night. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/13/2003 | 0000 | 11/26/2003 | 2300 |
| Subject: | SGP/EBBR/E12 - Pressure Sensor Measurement Scales With Battery Voltage |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | The barometer output was scaling with supply voltage (i.e. it
followed the charging of the battery by the solar panel).
NOTE: The barometer was replaced later than the end date of
this DQR. Why the problem ended on 26 Nov 2003 is unclear;
there was no site ops intervention on that date.
The problem did not affect the sensible and latent heat flux
calculations beyond the expected system error. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/28/2003 | 1750 | 10/28/2003 | 1845 |
| Subject: | SGP/EBBR/E12 - 6 Month Checks |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | Many measurements were incorrect while the AEM was positioned with both aspirators at the same height for comparison checks. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/03/2003 | 1500 | 10/12/2003 | 2355 |
| Subject: | SGP/EBBR/E12 - Pressure Sensor Measurement Scales With Battery Voltage |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.a1 |
| Description: | The barometer output scaled with supply voltage (it followed the charging of the battery by the solar panel). The problem did not affect the sensible and latent heat flux calculations beyond the expected system error. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.a1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/09/2003 | 2235 | 12/10/2003 | 1705 |
| Subject: | SGP/EBBR/E12 - Wind Speed Sensor Frozen By Ice Storm |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | The wind speed sensor was frozen stopped by ice from a storm. The wind speed and residual wind speed measurements are incorrect. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/02/2004 | 0945 | 02/02/2004 | 1820 |
| 02/09/2004 | 1215 | 02/09/2004 | 1430 |
| Subject: | SGP/EBBR/E12 - Wind Speed Frozen Stopped By Ice |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | An ice storm froze the wind speed sensor to a stopped condition. The wind speed and residual wind speed measurements are incorrect. This sensor failure does not affect the sensible and latent heat fluxes. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/02/2004 | 0810 | 02/02/2004 | 1930 |
| 02/09/2004 | 1235 | 02/09/2004 | 1405 |
| Subject: | SGP/EBBR/E12 - Wind Direction Frozen Stopped By Ice |
| DataStreams: | sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | The wind direction sensor was frozen stopped by ice from a storm. The wind direction, sigma_wd, and residual wind speed measurements are incorrect. |
| Measurements: | sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/19/2004 | 2212 | 03/10/2004 | 2247 |
| Subject: | SGP/EBBR/E12 - Incorrect Times |
| DataStreams: | sgp15ebbrE12.b1, sgp30baebbrE12.c1, sgp30ebbrE12.b1, sgp5ebbrE12.b1, sgpebbrE12.00 |
| Description: | The ntpd server (time adjustment) stopped working on Feb. 19th at 22:12:16 GMT, and the clock was corrected by -5600.177269 seconds on March 10th at 22:47 GMT. The recorded times for observations are off by amounts ranging from 0 seconds on Feb. 19th to 5600 seconds on March 10th. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgpebbrE12.00:
sgp30baebbrE12.c1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/12/2004 | 1630 | 10/12/2004 | 1700 |
| Subject: | SGP/EBBR/E12 - 6 Month Checks |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | Many measurements were incorrect while the AEM was positioned with both aspirators at the same height for comparison checks. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/12/2004 | 1545 | 10/27/2004 | 0645 |
| Subject: | SGP/EBBR/E12 - AEM home_15 Incorrect, Flux Measurements not affected |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | The home_15 measurement was incorrect during much of the stated period. The AEM was exchanging however, and thus the flux measurements were not affected. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 0735 | 01/08/2005 | 1700 |
| Subject: | SGP/EBBR/E12 - Wind Speed Frozen Stopped By Ice Storm |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | An ice storm froze the wind speed sensor to a stopped condition. The wind speed and residual wind speed measurements are incorrect. This sensor failure does not affect the sensible and latent heat fluxes. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 0935 | 01/08/2005 | 1630 |
| Subject: | SGP/EBBR/E12 - Wind Direction Frozen Stopped By Ice Storm |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | The wind direction sensor was frozen stopped by ice from a storm. The wind direction, sigma_wd, and residual wind speed measurements are incorrect. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/11/2005 | 1040 | 01/11/2005 | 0755 |
| Subject: | SGP/EBBR/E12 - Wind Speed Frozen Stopped By Ice |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | An ice storm froze the wind speed sensor to a stopped condition. The wind speed and residual wind speed measurements are incorrect. This sensor failure does not affect the sensible and latent heat fluxes. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/11/2005 | 1040 | 01/12/2005 | 0410 |
| Subject: | SGP/EBBR/E12 - Wind Direction Frozen Stopped By Ice |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | The wind direction sensor was frozen stopped by ice from a storm. The wind direction, sigma_wd, and residual wind speed measurements are incorrect. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/25/2005 | 0430 | 02/25/2005 | 1130 |
| Subject: | SGP/EBBR/E12 - Wind Speed and Direction Frozen by Ice Storm |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | The wind speed and direction sensors were frozen by ice from and ice storm. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/01/2001 | 0000 | 03/29/2005 | 1830 |
| Subject: | SGP/EBBR/E12 - Improved EBBR CR10 Program |
| DataStreams: | sgp30ebbrE12.b1 |
| Description: | Effective 20050329.1830, the EBBR.E12 CR10 program was revised to improve the quality of the primary measurements as follows: 1) An RMS procedure is used to determine max and min limits of acceptable soil heat flow. This is applied to the individual soil sets. Measurements outside the limits are rejected and the measurements within the limits are used to calculate the average soil heat flow. 2) Max and min limits are used to determine incorrect values of net radiation, sensible heat flux (h), latent heat flux (e), and automatic exchange mechanism (AEM) signal. If AEM signal is outside the limits, h and e are set to 999s. If net radiation is outside the limits, h and e are set to 999s. If h or e are outside the limits, h and e are set to 999s. Virtually no incorrect soil measurement will affect the primary measurements of h and e. By setting h and e to 999s, it can be easily seen that the primary variables are incorrect; no other interpretation is possible. Prior to 20050329, the improved CR10 program was NOT in effect. DQRs have been submitted for known instances of incorrect soil measurements which affected the quality of the primary measurements of h and e. Note: the DQR begin date is the begin date of the sgp30ebbrE12.b1 data stream. The earlier version of the CR10 program was also used on previous EBBR datastream names (e.g. sgp30ebbrE12.a1). |
| Measurements: | sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/01/2005 | 1800 | 03/29/2005 | 1830 |
| Subject: | SGP/EBBR/E12 - Average Soil Heat Flux Incorrect |
| DataStreams: | sgp30ebbrE12.b1 |
| Description: | A typo in the version 9 EBBR program caused average soil heat flow to be zero, resulting in both sensible and latent heat fluxes being approximately 20 watts per meter squared too large during the middle of the day. |
| Measurements: | sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/13/2003 | 0000 | 07/22/2005 | 2359 |
| Subject: | SGP/EBBR/E12 - metadata corrections |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | On 20050723, a series of metadata corrections and additions were completed. These metadata changes apply to all EBBR.E12 data collected by ARM back to the installation of the instrument in August 1993. Please see the current metadata for correct information. These changes do not affect data values or quality. The changes are summarized below: 1) Update of "sensor location" information 2) Addition of installation dates for the systems 3) Correction of soil type 4) Correction of soil moisture units (from "by volume" to "gravimetric") |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/27/2005 | 1730 | 01/02/2006 | 2330 |
| Subject: | SGP/EBBR/E12 - Sensible and Latent Heat Fluxes Incorrect at Times |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1 |
| Description: | Large spikes in soil temperature #2 are causing the soil heat storage term to blow up, and thus the average soil heat flow, sensible heat flux, and latent heat flux to be incorrect at times. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/08/2005 | 1100 | 12/08/2005 | 1300 |
| Subject: | SGP/EBBR/E12 - Multiplexer failure |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | Sensible and latent heat fluxes are incorrect during a period when multiplexer #2 experienced a failure. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/15/2006 | 2300 | 04/25/2006 | 1700 |
| Subject: | SGP/EBBR/E12 - Fluxes and Gradient Measurements Incorrect |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | The AEM hung in one position; therefore the fluxes and gradient measurements were incorrect. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/21/2006 | 1200 | 08/29/2006 | 1630 |
| Subject: | SGP/EBBR/E12 - Net Radiation, and Sensible and Latent Heat Fluxes Incorrect |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1, sgp5ebbrE12.b1 |
| Description: | Rain entered into the net radiometer through a broken top dome. Most of the net radiation values during the period are much too large, thus sensible and latent fluxes are also too large. |
| Measurements: | sgp15ebbrE12.b1:
sgp5ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/01/2006 | 0130 | 09/12/2006 | 1630 |
| Subject: | SGP/EBBR/E12 - Soil Temperature #1 Incorrect |
| DataStreams: | sgp15ebbrE12.b1, sgp30ebbrE12.b1 |
| Description: | During much of this period soil temperature #1 was offscale or erratic. Sensible and latent heat fluxes were not ususally affected. |
| Measurements: | sgp15ebbrE12.b1:
sgp30ebbrE12.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/20/1993 | 0730 | 12/22/1993 | 1500 |
| Subject: | SGP/EBBR/E12 - Invalid data due to blown AEM fuse at E12 |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | On December 20, 1993, before 0730 GMT, the fuse in the AEM (Automatic
Exchange Mechanism) of Pawhuska, OK (E12) EBBR blew out. The AEM remained
nonfunctional until the fuse was replaced just before 1500 GMT on
December 22, 1993. This situation 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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/03/1994 | 1200 | 06/08/1994 | 1515 |
| Subject: | SGP/EBBR/E12 - Wind Direction |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | For much of the period above, a malfunction in the E12 EBBR wind direction sensor (insect larvae shorting out the circuit board) caused incorrect values for 5 minute res_ws, wind_d, and sigma_wd, 15 minute mv_wind_d, and 30 minute res_ws, wind_d, and sigma_wd. Wind direction normally indicated north (near 0 or 360 degrees); there were some times during the period when wind directions looked good, but the lack of variation in direction and sigma implies that the data is suspect. Therefore, it would be wise to flag all of the values listed above during the entire time period as incorrect. The wind direction sensor (S/N 3081) was replaced with S/N 3042 at 1515 GMT on June 8, 1994. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/18/1994 | 2000 | 06/22/1994 | 1600 |
| Subject: | SGP/EBBR/E12 - Aspirator Failure |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | On June 18, 1994 the aspirator fan in the EBBR at E12, Pawhuska stopped
working. This situation was not discovered until a Preventative
Maintenance visit by site operations personnel on June 22, 1994. I
determined the time of the beginning of the malfunction from close
inspection of the sensible and latent heat flux data. There is no aspiration
status output for the EBBRs, nor is one presently possible. Wind speeds during
most of the period listed were sufficient to provide some (although
inadequate) aspiration to the temperature and relative humidity probes, making
it difficult for most users of the data to be able to tell (except in a few
circumstances) that the sensible and latent heat flux values produced were
incorrect. All of the data fields listed below are incorrect for the period
listed above. Latent and Sensible heat fluxes cannot be recomputed, as the
measurements that they are based on are what was corrupted.
30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
vp_top, vp_bot, bowen, e, h
15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l
5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
vp_top, vp_bot |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/22/1994 | 1200 | 08/04/1994 | 1600 |
| Subject: | SGP/EBBR/E12 - Stopped Ventilation Fan |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | On August 4, 1994, a site operator discovered the ventilation fan of the
EBBR to be stopped; the fan guard was clogged with animal remains.
Inspection of the EBBR data from Pawhuska, OK, E12 indicates that this
condition occurred from July 22 through August 4. Lack of ventilation of
the temperature and relative humidity sensors attached to the AEM results
in questionable measurements of air temperature, relative humidity, and all
quantities calculated from them, including sensible and latent heat fluxes.
The quantities that are questionable for the period indicated are:
5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
vp_top, and vp_bot
15 minute: rr_thum_r, 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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/20/1994 | 0230 | 08/31/1994 | 1542 |
| Subject: | SGP/EBBR/E12 - Miscellaneous Problems Affecting Data |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | Three hardware problems occurred at E12, Pawhuska, OK in late August 1994.
On August 12 the wind direction sensor malfunctioned. Therefore, all wind
direction, sigma, and resultant wind speed values for the period above are
incorrect. The wind direction sensor was replaced on August 31. Affected
data are:
5 minute: wind_d, sigma_wd, res_ws
15 minute: mv_wind_d
30 minute: wind_d, sigma_wd, res_ws.
Water accumulated in the AEM motor box and apparently caused a reduction in
the voltage level of the home signal (battery condition was very good and so
was not the cause); by late August 27 the hom30 level had fallen below the
minimum qc check level. The AEM continued to exchange properly. The minimum
qc level check is intended to help detect either a non-operating AEM or low
battery condition. The Campbell CR10 software operates properly unless the
hom30 signal is thirty-five or greater. So the low hom30 values do not
result in any incorrect data!!!. I point this out because this situation
demonstrates a condition flagged by the qc checks, even though no effect on
the data has occurred. The AEM box was dried out and new dessicant placed
in it on August 31.
On August 28, 1994 the left AEM housing ventilation fan ceased to operate
because of clogging of the ventilation system with debris. Fifteen minute
data seems to indicate that the fan stopped operating just before 1245 GMT.
This is at least the third such incidence of clogging this summer at different
EBBRs. The clog was removed and ventilation restored on August 31. The lack
of ventilation caused improper measurements of temperature and
relative humidity in the left housing (these are quite obvious in the 15
minute data but difficult to detect in the 30 minute data) and therefore
incorrect values of sensible and latent heat. Affected data are:
5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top,
hum_bot, vp_top, vp_bot
15 minute: rr_thum_l, mv_hum_l, tair_l
30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top,
hum_bot, vp_top, vp_bot, bowen, e, h. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/15/1994 | 1600 | 09/29/1994 | 1430 |
| Subject: | SGP/EBBR/E12 - Net Radiometer Hemisphere Changes |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The upper hemisphere of the net radiometer at the site was punctured allowing water to collect in the lower (and sometimes upper) section of the sensor. The punctures are most likely the result of migratory birds (a problem that we have experienced almost every year here at ANL also). The punctures (and water in some net radiometers) did not result in obvious invalidation of the data. Whether there is water in the lower hemisphere or not, a small puncture of the upper hemisphere would not have a major effect on the net radiation measurement. Significant amounts of water in the lower hemisphere should have a major effect on nighttime measurements particularly, although that effect is hard to detect in the data. The date when the puncture occurred is approximate - but is certainly no more than two weeks before the hemisphere was replaced. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/03/1994 | 1900 | 09/15/1994 | 1330 |
| Subject: | SGP/EBBR/E12 - Low home_15 Values |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The home signal values for the EBBR system installed at E12, Pawhuska, OK have
generally been lower than for the other EBBR systems. However, during the
period above the home_15 value was often lower than 35, which is then
improperly interpreted by the CR10 software. A home_15 value less than 35 is
interpreted as meaning that the AEM aspirated housings (which hold the
temperature and relative humidity sensors) are in the opposite orientation to
what they actually are. The AEM continues to exchange properly, but the
resulting calculations of Bowen ratio, latent heat flux, and sensible heat
flux are incorrect. On September 15, 1994 Site Operations personnel
refurbished the wiring for the left housing and the home_15 signal returned
to proper levels.
When 30 minute home_15 values are below 35, the data fields listed below are
incorrect.
5 minute: home, tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
vp_top, vp_bot
15 minute: mv_home
30 minute: home_15, tair_top, tair_bot, thum_top, thum_bot, hum_top,
hum_bot, vp_top, vp_bot, Bowen, e, h
It is possible to recalculate the Bowen ratio, e, and h by using the 15
minute data to compute the correct gradients of temperature and relative
humidity (two 15 minute periods are averaged to give a half hour value); the
orientation of the AEM is obvious in the 15 minute data, based on the home
signal (which is largest for the first 15 minutes of the half hour). More
information on performing this recalculation can be obtained from the
mentor. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/23/1995 | 0020 | 04/26/1995 | 1630 |
| Subject: | SGP/EBBR/E12 - Wind Direction Malfunction |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | For most of the period above, a malfunction in the E12 EBBR wind direction sensor caused the following data values to be incorrect: 5 minute: res_ws, wind_d, and sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, and sigma_wd. Wind direction normally indicated near north or 135 degrees (the latter indicates a malfunction). The wind direction sensor (S/N 3036) was replaced with S/N 3034 at 1620 GMT on April 26, 1995. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/06/1995 | 0700 | 06/07/1995 | 1830 |
| Subject: | SGP/EBBR/E12 - Wind Direction Malfunction |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | For the period indicated, a malfunction in the E12 EBBR wind direction sensor caused the following data values to be incorrect: 5 minute: res_ws, wind_d, and sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, and sigma_wd. Wind direction normally indicated smaller or larger than it should have. The affected time period was determined from comparison with data from E7, Elk Falls EBBR, which is located north of E12. The wind direction sensor (S/N 3034) was replaced with S/N 3039 at 1822 GMT on June 7, 1995. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/03/1995 | 0600 | 07/07/1995 | 1605 |
| Subject: | SGP/EBBR/E12 - Wind Direction Malfunction |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | For the period indicated, a malfunction in the E12 EBBR wind direction sensor caused the following data values to be incorrect: 5 minute: res_ws, wind_d, and sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, and sigma_wd. Wind direction normally indicated small values (15 to 25 degrees) from 3 July 1995 at 0600 GMT through 6 July 1995 at 1500 GMT (at which time the sensor was removed). No sensor was in place between 6 July 1995 at 1500 GMT and 7 July 1995 at 1605 GMT (at which time a new sensor was installed). Old sensor S/N K3039, new S/N K3033. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/20/1995 | 1700 | 09/14/1995 | 2359 |
| Subject: | SGP/EBBR/E12 - AEM Failure |
| DataStreams: | sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | As noted in a previous DQR, the home signal values at E12, Pawhuska, OK began decreasing in July. At the beginning of the period listed, the home 30 value dropped below 15; 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. No data is incorrect as a result of this condition. The home 15 value dropped below 35 beginning July 21, 1995, sometime after 2000 GMT; this causes a data quality message to be output in the site operations log as the stated acceptable range for home 15 is 35 to 70. Data is incorrect as a result of this condition, that being 30 minute e, h, and bowen. The home values frequently dropped below their proper levels until 10 August, 1995, at some time after 1100 GMT, when the set screws in the AEM would no longer hold and the aspirator units were stranded inbetween the home positions. Thereafter, the reported home signals were negative. All 30 minute e, h, and bowen data are incorrect for this condition. On August 16, 1995, at about 1600 GMT, site operators determined that they could not repair the AEM on-site and they determined that the replacement AEM that they took with them has an electronic short. Therefore, the AEM was left in manual mode (no exchange). Replacement of the AEM will not take place until a working spare is available and all 30 minute e, h, and bowen data will be incorrect until then. I will submit another DQR or addendum when successful replacement of the AEM is accomplished. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/16/1995 | 0015 | 08/30/1995 | 1757 |
| Subject: | SGP/EBBR/E12 - Wind Direction Malfunction |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | For the period above, a malfunction in the E12 EBBR wind direction sensor caused the wind direction to output a constant 212 degrees. Site operations replaced the sensor (S/N K3033) with K3042. The following data values are incorrect for the period listed: 5 minute: res_ws, wind_d, and sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, and sigma_wd. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/20/1995 | 1700 | 09/14/1995 | 1830 |
| Subject: | SGP/EBBR/E12 - AEM replacement |
| DataStreams: | sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | Please see DQR P950816.2, where this problem was first documented. As noted in a previous DQR, the home signal values at E12, Pawhuska, OK began decreasing in July. At the beginning of the period listed, the home 30 value dropped below 15; 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. No data is incorrect as a result of this condition. The home 15 value dropped below 35 beginning July 21, 1995, sometime after 2000 GMT; this causes a data quality message to be output in the site operations log as the stated acceptable range for home 15 is 35 to 70. Data is incorrect as a result of this condition, that being 30 minute e, h, and bowen. The home values frequently dropped below their proper levels until 10 August, 1995, at some time after 1100 GMT, when the set screws in the AEM would no longer hold and the aspirator units were stranded inbetween the home positions. Thereafter, the reported home signals were negative. All 30 minute e, h, and bowen data are incorrect for this condition. On August 16, 1995, at about 1600 GMT, site operators determined that they could not repair the AEM on-site and they determined that the replacement AEM that they took with them has an electronic short. Therefore, the AEM was left in manual mode (no exchange). All 30 minute e, h, and bowen data are incorrect until the end of the period listed above. On 13 September 1995 site operations personnel replaced the AEM (old S/N 92005, new S/N 94008). The new AEM would not exchange when the right sensor was in the home position: this was confirmed on 14 September when site operations personnel again visited the site. However, soon after the site operations personnel left Pawhuska on 14 September (at 1810 GMT), the AEM started to exchange properly (data correct for 1900 GMT and after). The AEM continues to operate properly. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/18/1995 | 0315 | 11/21/1995 | 2130 |
| Subject: | SGP/EBBR/E12 - AEM Failure/Right Radiation Shield OFF |
| DataStreams: | sgp30ebbrE12.a1 |
| Description: | On 18 November 1995 the AEM at E12, Pawhuska, OK stopped exchanging, with the right radiation shield at the bottom position. The 30 minute home signal reflects this condition. During the 21 November PM visit, the site operators also found that the right radiation shield was no longer attached to the AEM, but was dangling by its conduit. It is not clear whether both conditions occurred simultaneously. Comparison of E12 data with that at the Central Facility indicates that E12 data was correct on 17 November. The AEM had stopped exchanging because a transistor became unsoldered from the AEM circuit board. Site operators repaired this and reattached the right radiation shield to bring the system to operational status at 2130 GMT. All 30 minute latent heat (e), sensible heat (h), and Bowen ratio (bowen) data during the period above are incorrect. |
| Measurements: | sgp30ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/18/1996 | 0500 | 01/18/1996 | 2100 |
| 01/23/1996 | 0730 | 01/24/1996 | 1615 |
| Subject: | SGP/EBBR/E12 - Wind Speed Cups Frozen |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | Freezing rain, snow, and below freezing conditions during 18 and 23 January 1996 caused the wind speed sensor cups to freeze in a stopped state at E12, Pawhuska, OK. The cups were freed up later on 18 January when the wind speed rose to above 10 meters per second. When temperatures rose to above freezing on 24 January 1996, the ice thawed and the cups turned freely again. Measurements affected by the stalled wind speed sensor include: 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/11/1996 | 1550 | 04/11/1996 | 1640 |
| Subject: | SGP/EBBR/E12 - 3-month check |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/25/1996 | 1600 | 10/25/1996 | 1640 |
| Subject: | SGP/EBBR/E12 - EBBR 3 Month Checks - 10 EFs |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/09/1996 | 1000 | 10/09/1996 | 2000 |
| Subject: | SGP/EBBR/E12 - Annual Calibration Changeout |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | On 9 October 1996 the EBBR changeout for annual calibration occurred at E12, Pawhuska, OK. SEBS unit 10 was removed and unit 1 was installed. Between 1000 and 1500 GMT no data was collected. Data for half hours 1530-2000 GMT is incorrect; 3 month calibration checks were being performed. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/24/1996 | 1715 | 09/24/1996 | 1730 |
| Subject: | SGP/EBBR/E12 - Left Air Temperature Thermocouple Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The left air temperature thermocouple was offscale, for unknown reasons, for 1715 GMT for 15 minute, and 1730 GMT for 30 minute air temperature values. The malfunction of the air temperature thermocouple results in incorrect Bowen ratio, sensible heat flux, and latent heat flux during the period indicated. The data values that are affected are: 5 minute: tair_top, tair_bot 15 minute: tair_l 30 minute: tair_top, tair_bot, bowen, e, and h |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/13/1996 | 0000 | 10/09/1996 | 2359 |
| Subject: | SGP/EBBR/E12 - Battery Voltage Low - Fluxes Affected |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The battery condition deteriorated over time so that the solar panel was not always able to keep the battery voltage high enough to produce correct home signal values. The home 15 signal was too low much of the period above, with home 30 being low also occasionally. The home signal qc checks should be consulted to determine which half hour values of sensible (h) and latent (e) heat fluxes are incorrect; no other data values were affected. The first occurrence of low home 15 signal appears to be 0630 GMT on 13 July 1996. Battery voltage did not drop low enough to cause any sensors to stop functioning. The battery was replaced on 9 October 1996 at 2000 GMT, during annual calibration changeout of the entire EBBR unit (the mentor assumes that the battery was replaced - no instrument maintenance reports are available for that time). |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/20/1997 | 2255 | 03/31/1997 | 2359 |
| Subject: | Controlled burn at E12 on 3/20/97 and affected data |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0, sgpsirosE12.a1 |
| Description: | DQR No: Platforms: sgpsirosE12
sgpebbrE12
Subject: Controlled burn at E12 on 3/20/97 and affected data
Date Submitted: 3/31/97
Submitted By: Mike Splitt ___ Instrument Mentor
___ EST Member
___ Science Team Member
_x_ Other _Site_Scientist_Team_
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at problems@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc):
all levels
What location was the data collected at: sgp E12
Period of time in question
Begin Date 3/20/97 Time 22:55 (GMT)
End Date * Time : (GMT)
* The "end date" is not necessarily in need of definition. The EBBR data
appears to be directly affected for a period of about one hour. The
effect on the local shortwave albedo will be longer lasting and could
be said to "end" when the vegetative state recovers to being representative
of similar areas.
Data should be labeled:
___ questionable ___ All data fields affected
___ incorrect ___ Only some data fields affected
___ wrong calibration
_x_ others
Discussion of Problem:
This report is reflective of a change in environmental conditions thought
to be worth noting at E12, Pawhuska, and does not concern any issue of
substandard sensor performance.
A contolled burn was conducted at the the Pawhuska Extened Facillity (E12)
by the Tallgrass Prairie Preserve. The Preserve director, Bob Hamilton,
contacted the ARM SGP Site prior to the activity which allowed Site Operations
to take precautionary steps. Danny Nelson reported the following activities by
Site Operations:
1) Site Ops cut and removed all dried grass within the EF fence and
also to a 10' perimeter around the outside of the fence. Final grass
height was 1-3". This was done on Monday the 17th of March.
2) Tallgrass Prairie Preserve personnel put down a 10' wet line around
our EF prior to the burn on the 20th, so the EF area was not burned.
3) Site Ops had originally planned to deploy a field crew to inspect
the site on the day following the burn. TPP director Bob Hamilton had
agreed to call us the morning of the burn, but didn't actually call us
until this morning; the day following the burn. Due to the short
notification and prior commitment of personnel, Site Ops will not be
able to travel to the site until Monday or Tuesday of next week.
John Shatz was given the following information about the duration of
the burn:
>Bob Hamilton called and indicated that they did a control burn of the
>Tall Grass Prairie yesterday(3-20-97). He indicated that the fire in
>our area lasted between 4:55 PM to 5:40 PM. He also said that they
>plan to put this control burning on a two to three year cycle.
Affect on ARM Data:
Review of the EBBR temperature data (the sensor in the lower position)
shows a dramatic increase of temperature from 26 to 37 Celsius in a
10 minute period. The temperatures appear to have been affected for
approximately 1 hour.
Analysis of the broadband shortwave albedo during this period reveals
changes that appear to be related to the burn. The following is
a listing of the daily average shortwave albedos (caluclated by running a linear
regression fit on the "curve" created by plotting the upwelling shortwave
vs. the downwelling shortwave values from the E12 SIROS broadband instrumentation):
Date Broadband Shortwave Albedo
________ ____________________________
3-14-97 .171
3-15-97 .171
3-16-97 .169
3-17-97 .166
3-18-97 .135
3-19-97 .171
3-20-97 .174
3-21-97 .141
3-22-97 .143
3-23-97 .148
3-24-97 .147
The grass cutting activity at the EF does not appear to be responsible
for the abledo change on 3-18; this is likely related to the drizzle
and overcast sky conditions in the area on that day. Note that the albedo
recovers to previous values by the next day.
The burn occured late on the 20th, and it appears the albedo after the
burn sustained a more long-lasting decrease in value. Examination of
both the upwelling and downwelling solar irradiance indicates that
the albedo change was a resultant of the decrease in upwelling irradiance,
as the downwelling values were comparable to other sites. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgpsirosE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/03/1997 | 1200 | 06/08/1997 | 1515 |
| Subject: | SGP/EBBR/E12 - Wind Direction Sensor Malfunctions |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | For much of the period above, a malfunction in the E12 EBBR wind direction sensor (insect larvae shorting out the circuit board) caused incorrect values for 5 minute res_ws, wind_d, and sigma_wd, 15 minute mv_wind_d, and 30 minute res_ws, wind_d, and sigma_wd. Wind direction normally indicated north (near 0 or 360 degrees); there were some times during the period when wind directions looked good, but the lack of variation in direction and sigma implies that the data is suspect. Therefore, it would be wise to flag all of the values listed above during the entire time period as incorrect. The wind direction sensor (S/N 3081) was replaced with S/N 3042 at 1515 GMT on June 8, 1997. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/10/1997 | 1652 | 04/10/1997 | 1758 |
| Subject: | SGP/EBBR/E12 - EBBR Biannual Checks |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/1998 | 0750 | 01/04/1998 | 1900 |
| 01/08/1998 | 0705 | 01/08/1998 | 1925 |
| Subject: | SGP/EBBR/E12- EBBR Frozen Wind Speed |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | Wind speed cups were frozen during the indicated time periods. All 5, 15, and 30 minute data values indicated are incorrect for the periods listed. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/1998 | 1300 | 01/15/1998 | 1715 |
| Subject: | SGP/EBBR/E12 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown) |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: Note: Mentor supplied the end date/time for this DQR after submittal |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/18/1997 | 1700 | 12/31/1997 | 1615 |
| Subject: | SGP/EBBR/E12 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/27/1997 | 0530 | 12/18/1997 | 1805 |
| Subject: | SGP/EBBR/E12 - AEM Failure and Replacement |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The E12 AEM did not exchange for most of the period above, yielding small negative home signals. The AEM was replaced on 18 December by site operations personnel. All 30 minute e, h, and bowen data are incorrect for the times when the home signal is incorrect, and the temperature, relative humidity, and vapor pressures do not represent properly switched values. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/23/1997 | 1955 | 10/23/1997 | 2015 |
| Subject: | SGP/EBBR/E12 - 3-Month Check |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/07/1998 | 0130 | 05/21/1998 | 1830 |
| Subject: | SGP/EBBR/E12 - Wind Direction Sensor Failure |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The wind direction sensor failed, producing zero values. The cause is unknown. Data values affected are below: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_d 30 Minute: res_ws, wind_d, sigma_wd |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/21/1998 | 1855 | 05/21/1998 | 1918 |
| Subject: | SGP/EBBR/E12 - Six Month Checks |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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 indicated. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/21/1998 | 0245 | 12/22/1998 | 1630 |
| Subject: | SGP/EBBR/E12 - Wind Direction Data Incorrect (revised) |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The wind direction sensor was iced stopped by freezing rain, resulting in the following values being incorrect: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, sigma_wd |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/20/1998 | 2335 | 12/22/1998 | 1630 |
| 01/01/1999 | 1700 | 01/03/1999 | 1130 |
| 01/07/1999 | 1805 | 01/09/1999 | 0330 |
| Subject: | SGP/EBBR/E12 - Wind Speed Data Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/07/1999 | 1805 | 01/09/1999 | 0330 |
| Subject: | SGP/EBBR - EBBR E12 Wind Speed Data Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.00, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp5ebbrE12.00:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/1999 | 1700 | 01/03/1999 | 1130 |
| Subject: | SGP/EBBR - EBBR E12 Wind Speed Data Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.00, sgp5ebbrE12.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: | sgp5ebbrE12.a0:
sgp5ebbrE12.00:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/28/1998 | 1600 | 12/28/1998 | 1630 |
| Subject: | SGP/EBBR/E12 - Data Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.00, sgp5ebbrE12.a0 |
| Description: | Most of the data values for just this time (1630 GMT) for the 5, 15, and 30 minute periods are incorrect; this apparently was the result of PM activities. |
| Measurements: | sgp5ebbrE12.a0:
sgp5ebbrE12.00:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/28/1998 | 1345 | 12/28/1998 | 1730 |
| Subject: | SGP/EBBR/E12 - Temperature, RH, and Vapor Pressure Data Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | The right aspirator housing fell off of the AEM around 1345 GMT, by looking
at the data. The housing was put back into place later in the day during
a PM visit. The following values were affected:
5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top,
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: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/24/1998 | 1315 | 11/24/1998 | 1530 |
| Subject: | SGP/EBBR/E12 - All Temperature Measurements Incorrect |
| DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
| Description: | Failure of the multiplexer connection for the reference temperature thermocouple in the control box or a problem with the Campbell CR10 bridge circuitry caused all air and soil temperature measurements to be incorrect. Therefore, the computed 30 minute bowen, e, and h were also incorrect. |
| Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/04/1999 | 1630 | 06/04/1999 | 1700 |
| Subject: | SGP/EBBR/E12 - RH top Data Zero |
| DataStreams: | sgp30ebbrE12.a1 |
| Description: | The one data value hum_top was incorrect in the 30 minute data. 5 and 15 minute data were not affected, and the 30 minute flux data was not affected. The data value may have been lost in remote data retrieval, resulting in a zero value instead. |
| Measurements: | sgp30ebbrE12.a1:
|