DQR ID | Subject | Data Streams Affected |
---|---|---|
D000210.2 | SGP/EBBR - EBBR E19 Changeout, Data Missing/Incorrect | sgp15ebbrE19.b1, sgp30ebbrE19.b1, sgp5ebbrE19.b1 |
D010427.9 | SGP EBBR E19 - E19 EBBR Soil Heat Flow #1 Sign Reversed | sgp30ebbrE19.b1, sgp15ebbrE19.b1 |
D040525.3 | SGP/EBBR/E19 - Metadata errors | sgp15ebbrE19.b1, sgp30baebbrE19.c1, sgp30ebbrE19.b1 |
D061220.11 | SGP/EBBR/E19 - Wind Direction Dependency of Surface Fluxes and General Data Quality Information | sgp30ebbrE19.b1 |
D980110.2 | SGP/EBBR/E19 - Noisy Sensible and Latent Heat Fluxes | sgp30ebbrE19.b1, sgp5ebbrE19.b1, sgp15ebbrE19.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/20/1999 | 1430 | 07/20/1999 | 1830 |
Subject: | SGP/EBBR - EBBR E19 Changeout, Data Missing/Incorrect |
DataStreams: | sgp15ebbrE19.b1, sgp30ebbrE19.b1, sgp5ebbrE19.b1 |
Description: | During changeout of the EBBR system at E19, data was missing for the time period, except for 1815-1830 GMT, when the data was incorrect. |
Measurements: | sgp15ebbrE19.b1:
sgp5ebbrE19.b1:
sgp30ebbrE19.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/24/1999 | 0445 | 01/25/2001 | 1531 |
Subject: | SGP EBBR E19 - E19 EBBR Soil Heat Flow #1 Sign Reversed |
DataStreams: | sgp30ebbrE19.b1, sgp15ebbrE19.b1 |
Description: | The sign was reversed (heat flow plate #1 was installed upside down), causing incorrect measurements, as indicated. The average soil heat flow can be recalculated by using an average of soil sensor sets 2-5. The recalculated average soil heat flow can then be used to recalculate latent and sensible heat fluxes. |
Measurements: | sgp15ebbrE19.b1:
sgp30ebbrE19.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/30/1997 | 0000 | 05/06/2003 | 2359 |
Subject: | SGP/EBBR/E19 - Metadata errors |
DataStreams: | sgp15ebbrE19.b1, sgp30baebbrE19.c1, sgp30ebbrE19.b1 |
Description: | The latitude, longitude and altitude of the El Reno (E19) site were incorrectly entered into the ARM database. The correct location of the EBBR.E19 instrument is: Lat: 35.557N Lon: 98.017W Alt: 421m |
Measurements: | sgp15ebbrE19.b1:
sgp30ebbrE19.b1:
sgp30baebbrE19.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/30/1997 | 1000 | 10/12/2003 | 2330 |
Subject: | SGP/EBBR/E19 - Wind Direction Dependency of Surface Fluxes and General Data Quality |
DataStreams: | sgp30ebbrE19.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): 0-133, 151-360 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: | sgp30ebbrE19.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/30/1997 | 1500 | 07/20/1999 | 1530 |
Subject: | SGP/EBBR/E19 - Noisy Sensible and Latent Heat Fluxes |
DataStreams: | sgp30ebbrE19.b1, sgp5ebbrE19.b1, sgp15ebbrE19.b1 |
Description: | "Noisy" sensible and latent heat fluxes often occur during daytime periods when the net radiation is smaller (less than 150 watts/m2), but this is not the only condition under which it occurs. During this condition especially, the temperature gradient, RH gradient, and thus the vapor pressure gradient are near zero; this causes the sensible and latent heat flux gradients to be inaccurately calculated. Good examples of these conditions occurred on 28 December 1997 and 6 January 1998. However, even when there is substantial net radiation the problem does sometimes occur; good examples of this are found during daytime or nighttime variously on 1, 2, 3, and 4 January 1998. The conditions occur more fequently than at other EBBR sites; they do occur at other EBBR sites, but less frequently. |
Measurements: | sgp15ebbrE19.b1:
sgp5ebbrE19.b1:
sgp30ebbrE19.b1:
|