DQR ID | Subject | Data Streams Affected |
---|---|---|
D040424.1 | SGP/MPL/C1 - Signal degrading | sgpmplC1.a1, sgpmplnor1campC1.c1 |
D040525.28 | SGP/MPL/C1 - Metadata errors | sgpmplC1.a1, sgpmplnor1campC1.c1 |
D931112.1 | operator error | sgpsondeC1.a0, sgpsondeC1.a1 |
D950420.1 | SGP/SONDE/C1 - Reprocess: Bad surface pressure | sgpsondeC1.a0, sgpsondeC1.a1 |
D980331.1 | Instrument misalignment report | sgpmplnor1campC1.c1 |
D980402.1 | Laser Output Energy Monitor at Zero | sgpmplnor1campC1.c1 |
D980402.2 | Laser Output Energy Monitor at Zero | sgpmplnor1campC1.c1 |
D990224.1 | SGP/MPL - Missing data due to blown detector | sgpmplC1.a1, DsgpmplhrC1.00, sgpmplnor1campC1.c1, sgpmplcbh1scottC1.c1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/25/2002 | 0000 | 01/16/2003 | 2359 |
Subject: | SGP/MPL/C1 - Signal degrading |
DataStreams: | sgpmplC1.a1, sgpmplnor1campC1.c1 |
Description: | The MPL viewport window was blown off during a storm on 2002/09/25. The MPL received a soaking of rain. Following this event, although site operations cleaned and dried the optics, the lidar performance continued to degrade over the next few months. Although initially suitable for cloud detection, by Dec 10th the lidar was providing useful results only during the day (oddly enough). By Jan 16, the detector was dead. It is not recommended to depend on night-time cloud base heights after Dec. 10 2002. It is not recommended to use any of the data after 9/25 for aerosol retrievals. |
Measurements: | sgpmplC1.a1:
sgpmplnor1campC1.c1:
|
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 |
---|---|---|---|
11/11/1993 | 1927 | 11/12/1993 | 2359 |
Subject: | operator error |
DataStreams: | sgpsondeC1.a0, sgpsondeC1.a1 |
Description: | DQR No: Platform: SGPSONDEC1 Subject: operator error Date Submitted: 11/12/93 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at problems@arm.gov. Platform/Measurement: All What level data: (raw,a0,a1,b1,c1 etc): What location was the data collected at: SGP/CF Period of time in question Begin Date 11/11/93 Time 19:27 (GMT) End Date / / Time : (GMT) Sonde data files 11/11/93 19:27 and following may have bad data. Data should be labeled: _X_ questionable ___ All data fields affected ___ incorrect ___ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: Mike Splitt of the site scientist team noted that the sounding done 11/11/93 showed 0 RH at the ground. I looked at the raw data file and also noted that the ground check humidity values were entered as 70 (reference) and 69 (sonde). The ground check humidity values should be zero. This suggests an operator error of some sort. Because 11/11 was a holiday, the usual sonde operator was not on site. No entries of anything unusual were found in the daily ops log. It may be coincidental that the SDS change-over moving Dorothy from the SPARC 2 to the SPARC 10 occurred at this time, but it may not be. The sounding done 11/12/93 also had problems. Dave Glahn reported that the first sonde he tried showed 44% RH in the ground check set. This typically results from using an incorrect calibration tape. Dave opened a second sonde which passed ground check. After launch, when Dave attempted to enter the surface observations, he says they were not written to the normal output file and that he was unable to graph the sounding on the sonde PC as it was occurring. The operators played with the computer and ended up overwriting the standard output file - losing all data below about 5 km. It is difficult to determine the cause of the problem. These data files should be flagged as questionable until we understand what happened. My hypothesis is that the operators inadvertently modified the sonde software on 11/11 and that the output files are being written to the wrong directories. It is also possible that this problem resulted from the SDS change-over. SDS change-overs have, in the past, caused problems with the sonde data archiving. I gave instructions to Dave Glahn to check the directory pointers before doing a sounding on Monday. I will be on site Wednesday (for another purpose) and will check the system if we do not have resolution by then. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. Data Processing Notes Date |
Measurements: | sgpsondeC1.a1:
sgpsondeC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/06/1994 | 1429 | 05/06/1994 | 1629 |
Subject: | SGP/SONDE/C1 - Reprocess: Bad surface pressure |
DataStreams: | sgpsondeC1.a0, sgpsondeC1.a1 |
Description: | An incorrect value was entered by the operator for surface pressure. The value as entered as 873.9 (hPa) should be 973.9. This error results in incorrect altitude values throughout the sounding and incorrect ascent rate values during the first few minutes. |
Measurements: | sgpsondeC1.a1:
sgpsondeC1.a0:
|
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:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/25/1997 | 2123 | 04/28/1997 | 1459 |
Subject: | Laser Output Energy Monitor at Zero |
DataStreams: | sgpmplnor1campC1.c1 |
Description: | Energy monitor reading for laser output is at zero for intermittant one-minute averaged shots during this flagged data period. From the lidar equation progressing to normalized relative backscatter the laser energy is required and is a denominator. Therefore a value of zero will render the product as infinite. Shots where this has taken place are left as zeros. It is suggested that the time period 19970425 2123 - 19970428 1459 be avoided for any quantitative analysis. |
Measurements: | sgpmplnor1campC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/02/1997 | 2211 | 09/03/1997 | 1359 |
09/07/1997 | 1445 | 09/08/1997 | 1544 |
09/10/1997 | 2142 | 09/10/1997 | 2355 |
Subject: | Laser Output Energy Monitor at Zero |
DataStreams: | sgpmplnor1campC1.c1 |
Description: | Energy monitor reading for laser output is at zero for intermittant one-minute averaged shots during this flagged data period. From the lidar equation progressing to normalized relative backscatter the laser energy is required and is a denominator. Therefore a value of zero will render the product as infinite. Shots where this has taken place are left as zeros. It is suggested that the time periods 19970902 2211 - 19970903 1359, 19970907 1445 - 19970908 1544, and 19970910 2142 - 19970910 2355 be avoided for any quantitative analysis. |
Measurements: | sgpmplnor1campC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/11/1998 | 0000 | 01/23/1999 | 2359 |
Subject: | SGP/MPL - Missing data due to blown detector |
DataStreams: | sgpmplC1.a1, DsgpmplhrC1.00, sgpmplnor1campC1.c1, sgpmplcbh1scottC1.c1 |
Description: | Sometime early 11/11 the detector on the MPL-004 blew out. The Detector was replaced by Albert Mendoza. The instrument was operational on Jan. 23, 1999. Link this to P981119.2 that reported the blown detector and the corrective action taken |
Measurements: | sgpmplcbh1scottC1.c1:
sgpmplC1.a1:
sgpmplnor1campC1.c1:
DsgpmplhrC1.00:
|