DQR ID | Subject | Data Streams Affected |
---|---|---|
D020909.6 | SGP/SMOS/E8 - Snow depth sensor removed; data reported as missing | sgp1440smosE8.a1, sgp30smosE8.a1, sgp30smosE8.b1 |
D040126.5 | SGP/SWATS/E8 - Sensor failure, 15cm W | sgpswatsE8.b1 |
D050719.7 | SGP/EBBR/E8 - Improved EBBR CR10 Program | sgp30ebbrE8.b1 |
D061220.4 | SGP/EBBR/E8 - Wind Direction Dependency of Surface Fluxes and General Data Quality Information | sgp30ebbrE8.b1 |
D081024.4 | SGP/SWATS/E8 - Sensor failure, 35cm W | sgpswatsE8.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/12/2002 | 1745 | 07/17/2003 | 2359 |
Subject: | SGP/SMOS/E8 - Snow depth sensor removed; data reported as missing |
DataStreams: | sgp1440smosE8.a1, sgp30smosE8.a1, sgp30smosE8.b1 |
Description: | The snow depth sensor was removed from service. The program was changed so that -9999 is entered into the datastream. |
Measurements: | sgp1440smosE8.a1:
sgp30smosE8.a1:
sgp30smosE8.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/05/2002 | 0500 | 11/10/2009 | 1300 |
Subject: | SGP/SWATS/E8 - Sensor failure, 15cm W |
DataStreams: | sgpswatsE8.b1 |
Description: | The temperature rise readings from the 15-cm depth on the west profile are incorrect. This also causes the matric potential and water content data to be incorrect. Instrument removed from service 20091110. |
Measurements: | sgpswatsE8.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/01/2001 | 0000 | 03/22/2005 | 1730 |
Subject: | SGP/EBBR/E8 - Improved EBBR CR10 Program |
DataStreams: | sgp30ebbrE8.b1 |
Description: | Effective 20050322.1730, the EBBR.E8 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 20050322, 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 sgp30ebbrE8.b1 data stream. The earlier version of the CR10 program was also used on previous EBBR datastream names (e.g. sgp30ebbrE8.a1). |
Measurements: | sgp30ebbrE8.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/12/1993 | 1630 | 10/12/2003 | 2330 |
Subject: | SGP/EBBR/E8 - Wind Direction Dependency of Surface Fluxes and General Data Quality |
DataStreams: | sgp30ebbrE8.b1 |
Description: | Beginning in FY2006, Data Quality Reports are not written for missing data or for situations when qc flags clearly show that the data is incorrect (this is true for most of the conditions listed below). DQRs are written for periods when data is incorrect, when the situation is not represented by qc flags in the data, and it's not obvious that the data should have been flagged as incorrect. The EBBR data is only useful for particular wind directions at each Extended Facility. Please use the following resources to help in interpreting the EBBR data. 1) qc flags in the EBBR data. 2) Instrument Mentor Monthly Summaries (IMMS) at http://www.db.arm.gov/IMMS/ 3) SGP EF Surface Conditions Observations (EFSCO) at http://198.124.96.210:591/sfc_cond1/default.htm 4) Surface fluxes are valid only for the following wind directions (in degrees): 0-224, 314-360 Note that there are wind directions at most sites for which the fetch is insufficient and therefore EBBR data is invalid. Appropriate fetch was determined from a 1/40 measurement height to fetch ratio, resulting in a required minimum fetch of 120 m. Particular attention should be paid to the limited valid wind directions for the Central Facility EBBR. The surface vegetation type for the EBBRs is grazed or ungrazed grassland (refer to the EFSCO for state). 5) Some conditions that commonly cause the EBBR primary measurements to be incorrect or missing follow: a) Sensible and latent heat fluxes are not accurate during times when the Automatic Exchange Mechanism (AEM) is not functioning properly. The AEM switches the gradient measuring instrumentation between the top and bottom positions every 15 minutes; this reduces the effects of instrument offsets. Sometimes the AEM does not reach it's full extent of travel, resulting in the home signal being zero. b) Sensible and latent heat fluxes are sometimes incorrect when surface soil heat flow is out of range, as seen in the average soil heat flux (ave_shf). c) Very light winds may be seen at nights for brief periods. Wind direction flops around a lot during low wind conditions (< 1.5 m/s) and is often unreliable during those periods. d) Missing data periods occur at times; this is usually a site data system collection/communication problem; it can also occur during replacement of the system with a newly calibrated unit. Missing data is sometimes filled in later from manual or automatic re-collection of the data. |
Measurements: | sgp30ebbrE8.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/20/1999 | 1700 | 11/10/2009 | 1300 |
Subject: | SGP/SWATS/E8 - Sensor failure, 35cm W |
DataStreams: | sgpswatsE8.b1 |
Description: | The sensor installed at 35 cm at the west profile has produced questionable data ince it was installed back in 1996. Once the sensor began to stabilize at 17:00 GMT on 07/20/99, it has produced questionable or incorrect values of temperature rise. From 07/20/99 to the present date, 35cm W temperature rise values have stayed within a range of approximately 0.8-2.0 C, while the sensor from the 35cm E profile has produced an approximate range of 1.5-4.0 C. In addition, the calibration for this sensor is so bad it is not possible to correct it using field data. The range of temperature rise values produced by this sensor is too limited to reliably re-calibrate the instrument. Under the old ARM calibration for SWATS, the calibrated reference temperature change should fall within a range of 1.45-4.00 C (the new range is 1.38-3.96 C). For this sensor, the reference temperature change has fallen within an approximate range of 0.2-1.7 C and the calibration is actually adjusting the trise measurements in the wrong direction. Therefore, all temperature rise, matric potential and water content data are all highly suspect from the 35cm W sensor. The soil temperature data appear to be OK. Instrument removed from service 20091110. |
Measurements: | sgpswatsE8.b1:
|