DQR ID | Subject | Data Streams Affected |
---|---|---|
D020927.1 | SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities | sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1 |
D021113.4 | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header | sgp30ebbrE12.b1, sgp30ebbrE13.b1, sgp30ebbrE15.b1, sgp30ebbrE20.b1, sgp30ebbrE22.b1, sgp30ebbrE26.b1, sgp30ebbrE4.b1, sgp30ebbrE7.b1, sgp30ebbrE8.b1, sgp30ebbrE9.b1 |
D040525.28 | SGP/MPL/C1 - Metadata errors | sgpmplC1.a1, sgpmplnor1campC1.c1 |
D040525.29 | SGP/MPL/C1 - Metadata errors | sgpmplcbh1scottC1.c1 |
D061220.8 | SGP/EBBR/E13 - Wind Direction Dependency of Surface Fluxes and General Data Quality Information | sgp30ebbrE13.b1 |
D980331.1 | Instrument misalignment report | sgpmplnor1campC1.c1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/01/1996 | 0000 | 02/04/2000 | 2359 |
Subject: | SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities |
DataStreams: | sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1 |
Description: | Prior to February 4, 2000, the ARSCL data set incorporated data from the Beaufort Laser Ceilometer as one of its inputs. Because of the BLC's high spatial resolution, this data was often chosen by ARSCL as the "CloudBaseBestEstimate" for boundary layer clouds. It was subsequently determined that the BLC cloud base was biased, with the BLC reporting cloud base heights that are 122 meters too high. The bias error will be corrected when the entire ARSCL data set is reprocessed as part of release_4. (The release version number is included the the netCDF global comments). This reprocessing will also include a small correction the the MMCR near-field reflectivities. This correction is less than 1 dB except for hydrometers within 200 meters of the surface. Thanks to Roger Marchand for helping bracket this problem. |
Measurements: | sgparsclbnd1clothC1.c1:
sgparscl1clothC1.c1:
sgparsclcbh1clothC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/01/1993 | 1200 | 06/18/2003 | 1159 |
Subject: | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR |
DataStreams: | sgp30ebbrE12.b1, sgp30ebbrE13.b1, sgp30ebbrE15.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. (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: | sgp30ebbrE26.b1:
sgp30ebbrE9.b1:
sgp30ebbrE7.b1:
sgp30ebbrE4.b1:
sgp30ebbrE12.b1:
sgp30ebbrE15.b1:
sgp30ebbrE22.b1:
sgp30ebbrE13.b1:
sgp30ebbrE8.b1:
sgp30ebbrE20.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/01/1996 | 0000 | 01/19/2000 | 2359 |
Subject: | SGP/MPL/C1 - Metadata errors |
DataStreams: | sgpmplC1.a1, sgpmplnor1campC1.c1 |
Description: | The latitude, longitude and altitude of the Micropulse Lidar (MPL) were incorrectly entered into the ARM database. The correct location of the SGP.C1 MPL is: Lat: 36.606N Lon: 97.485W Alt: 316m |
Measurements: | sgpmplC1.a1:
sgpmplnor1campC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/10/1994 | 0000 | 01/19/2000 | 2359 |
Subject: | SGP/MPL/C1 - Metadata errors |
DataStreams: | sgpmplcbh1scottC1.c1 |
Description: | The latitude, longitude and altitude of the Micropulse Lidar (MPL) were incorrectly entered into the ARM database. The correct location of the SGP.C1 MPL is: Lat: 36.606N Lon: 97.485W Alt: 316m |
Measurements: | sgpmplcbh1scottC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/13/1993 | 1200 | 10/12/2003 | 2330 |
Subject: | SGP/EBBR/E13 - Wind Direction Dependency of Surface Fluxes and General Data Quality |
DataStreams: | sgp30ebbrE13.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): 0-52, 142-194, 328-360 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: | sgp30ebbrE13.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/15/1997 | 0000 | 09/10/1997 | 0000 |
Subject: | Instrument misalignment report |
DataStreams: | sgpmplnor1campC1.c1 |
Description: | A low-resolution (300 m) MPL system (unit number 04) was installed at the SGP site in April '97 upon the laser diode failure of the 02 unit in March. Calibration of this instrument in August found that the optics were misaligned causing a near range focusing error in the data. Calibration files produced for this data, while acceptable, do not completely correct for the problem. As a result, aerosol property retrievals using this data are not suggested. Cloud boundary heights, though appear satisfactory. This system was removed from SGP in early September |
Measurements: | sgpmplnor1campC1.c1:
|