DQR ID | Subject | Data Streams Affected |
---|---|---|
D040526.2 | SGP/AERI/C1 - Metadata errors | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1 |
D040527.1 | SGP/AERI/C1 - Time Offset Corrected | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaeriprofC1.c1, sgpgaeriprofC1.c1, sgplblch1aeriC1.c1, sgplblch2aeriC1.c1, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaeriprofC1.c1 |
D040816.1 | SGP/AERI/C1 - Data Reprocessed to correct laser wavenumber | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1 |
D060719.3 | SGP/AERI/C1 - Missing data | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1 |
D111003.1 | SGP/AERI/C1 - AERI-01 instrument field of view | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01prof3feltzC1.c1, sgpaeri01prof3feltzC1.s1, sgpaeri01summaryC1.a1 |
D960701.3 | Obstruction in the AERI-01 Enclosure | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1 |
D960715.1 | Dust on the Scene Mirror | sgpaeri01ch1C1.a1 |
D960715.2 | Dust on the Scene Mirror | sgpaeri01ch1C1.a1 |
D970627.1 | Software update on the AERI | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1 |
D980414.1 | AERI data effected by failing detector cooler | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerich1C1.a1, sgpaerich1C1.a2, sgpaerich2C1.a1, sgpaerich2C1.a2, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaerilbldiffssC1.c1, sgpaeriprofC1.c1, sgpaerisummaryC1.a1, sgpaerisummaryC1.a2, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerilblssC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaerimeansssC1.c1, sgpqmeaeriprofC1.c1, sgpaeriC1.00 |
D980414.2 | Tumbleweed in AERI Field of View | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerich1C1.a1, sgpaerich1C1.a2, sgpaerich2C1.a1, sgpaerich2C1.a2, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaerilbldiffssC1.c1, sgpaeriprofC1.c1, sgpaerisummaryC1.a1, sgpaerisummaryC1.a2, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerilblssC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaerimeansssC1.c1, sgpqmeaeriprofC1.c1, sgpaeriC1.00 |
D980414.3 | CO2 Suppression of AERI Spectra | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerich1C1.a1, sgpaerich1C1.a2, sgpaerich2C1.a1, sgpaerich2C1.a2, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaerilbldiffssC1.c1, sgpaeriprofC1.c1, sgpaerisummaryC1.a1, sgpaerisummaryC1.a2, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerilblssC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaerimeansssC1.c1, sgpqmeaeriprofC1.c1, sgpaeriC1.00 |
D990920.1 | SGP/AERI/C1 - Reprocessed: radiance data | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01summaryC1.a1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaeriprofC1.c1, sgplblch1C1.c1, sgplblch1lsC1.c1, sgplblch2C1.c1, sgplblch2lsC1.c1, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpaeri01C1.00 |
D991123.1 | SGP/AERI - AERI01 scene mirror motor failure | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilbldiffC1.c1, sgpaeriprofC1.c1, sgplblch1C1.c1, sgplblch1lsC1.c1, sgplblch2C1.c1, sgplblch2lsC1.c1, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaeriprofC1.c1, sgpgaeriprofC1.c1, sgpaeri01C1.00 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/22/1995 | 0012 | 05/14/2003 | 2359 |
Subject: | SGP/AERI/C1 - Metadata errors |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1 |
Description: | The latitude, longitude and altitude of the AERI were incorrectly entered into the ARM database. The correct location of the SGP.C1 AERI is: Lat: 36.606N Lon: 97.485W Alt: 316m |
Measurements: | sgpaeri01ch1C1.a1:
sgpaerilbldifflsC1.c1:
sgpaeri01summaryC1.a1:
sgpaerilblcloudsC1.c1:
sgpaeri01engineerC1.a1:
sgpaeri01ch2C1.a1:
sgpaerilbldiffC1.c1:
sgpqmeaerimeansC1.c1:
sgpqmeaerilblC1.c1:
sgpqmeaerilbllsC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/14/2001 | 0010 | 10/19/2001 | 1614 |
10/29/2001 | 1622 | 11/20/2001 | 1657 |
Subject: | SGP/AERI/C1 - Time Offset Corrected |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaeriprofC1.c1, sgpgaeriprofC1.c1, sgplblch1aeriC1.c1, sgplblch2aeriC1.c1, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaeriprofC1.c1 |
Description: | The SGP.C1 AERI system clock was not being regularly checked and synched with a time server between May 2001 and November 2001. When the problem was identified and the clock was corrected, a time offset of 17 minutes and 2 seconds (slow) was present. The data available from the ARM Archive have been time corrected by Dave Turner using a piece-wise linear function based on a comparison of pressure data from the AERI and SMOS. Dave indicates "this results in a good fit to the data" and "errors in the reported sample times are reduced to approximately 1 minute or less. Given the nominal three minute averaging period of the AERI, this should suffice for most applications." Data between 20011019.1615-20011029.1621 did not need to be corrected due to a series of events that caused the clock to be temporarily synched and then revert back to the linear drift pattern. Note, there are three other variables in the AERI data products which report time: Time, timeHHMMSS and rawTimeHHMMSS. The data in these variables were not modified, so these data will not agree with basetime + time_offset. Also note, VAPs which use the AERI data as input were NOT reprocessed. VAP data during the time period specified are questionable and should be used with caution. |
Measurements: | sgpaeri01ch1C1.a1:
sgpaeri01engineerC1.a1:
sgpaeriprofC1.c1:
sgpqmeaerimeansC1.c1:
sgpgaeriprofC1.c1:
sgpaerilbldifflsC1.c1:
sgplblch1aeriC1.c1:
sgpaeri01summaryC1.a1:
sgpaerilblcloudsC1.c1:
sgpaeri01ch2C1.a1:
sgpaerilbldiffC1.c1:
sgplblch2aeriC1.c1:
sgpqmeaerilblC1.c1:
sgpqmeaeriprofC1.c1:
sgpqmeaerilbllsC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/02/2000 | 0000 | 05/10/2002 | 2359 |
Subject: | SGP/AERI/C1 - Data Reprocessed to correct laser wavenumber |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1 |
Description: | SGP.C1 AERI data from 20000302-20020510 have been reprocessed to correct for the spectral calibration; i.e., to correct the laser wavenumber. These data are now available from the ARM Archive. Data users who retrieved the previous version of this data from the archive should consider the following graphic to gauge the impact the correction might have on their analyses. vlaser_correction_example.png Note: only the ch1 and ch2 data were reprocessed; the summary data have not been recomputed. The summary data typically are 5 to 25 cm-1 spectral averages of the ch1 and ch2 data, and the effect of the spectral calibration on these averages should be negligible. |
Measurements: | sgpaeri01ch1C1.a1:
sgpaeri01ch2C1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/27/2006 | 2256 | 07/10/2006 | 2006 |
Subject: | SGP/AERI/C1 - Missing data |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1 |
Description: | Data are missing and unrecoverable. |
Measurements: | sgpaeri01ch1C1.a1:
sgpaerilblcloudsC1.c1:
sgpaeri01summaryC1.a1:
sgpaeri01engineerC1.a1:
sgpaeri01ch2C1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/20/2010 | 1517 | 07/23/2010 | 1800 |
Subject: | SGP/AERI/C1 - AERI-01 instrument field of view |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01prof3feltzC1.c1, sgpaeri01prof3feltzC1.s1, sgpaeri01summaryC1.a1 |
Description: | The AERI-01 was removed from its bump-out during this period of time and data collected was a view of the ceiling of the Optical Trailer. AERI-C1 (previously named aeriE14) continued to run for inter-comparison. |
Measurements: | sgpaeri01prof3feltzC1.s1:
sgpaeri01ch1C1.a1:
sgpaeri01summaryC1.a1:
sgpaeri01engineerC1.a1:
sgpaeri01ch2C1.a1:
sgpaeri01prof3feltzC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/21/1996 | 2200 | 06/13/1996 | 2200 |
Subject: | Obstruction in the AERI-01 Enclosure |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1 |
Description: | DQR No: Subject: Obstruction in the AERI-01 Enclosure Date Submitted: Submitted By: Robert Knuteson ___ Instrument Mentor ___ EST Member _X_ Science Team Member ___ Other _____________________________ Organization: University of Wisconsin - Madison Email address: robert.knuteson@ssec.wisc.edu Telephone: 608-263-7974 Platform/Measurement: What level data: (raw,a0,a1,b1,c1 etc): All levels What location was the data collected at: ARM SGP CF Period of time in question Begin Date May/ 21/ 1996 Time 22:00 (GMT) End Date June/ 13/ 1996 Time 22:00 (GMT) Data should be labeled: ___ questionable _X_ incorrect ___ wrong calibration ___ others _______________________________ Discussion of Problem: The AERI Profile QME (Wayne Feltz) first detected a problem with AERI-01 data from the SGP CF. Investigation by site personnel on June 14, found numerous bird droppings in the area around the AERI-01 sky hatch plus some grass lying across a portion of the hatch opening. Using the AERI-LBLRTM QME to analyse the data after the fact it appears likely that nesting birds placed pieces of grass in a position to obstruct the AERI field of view to the sky. By some quirk of fate, the problem actually fixed itself about 12 hours before the site personnel made their inspection of the AERI viewport and discovered the evidence described above. The system has been operating normally since June 13, 1996 22:00 UTC as confirmed by a recent analysis of the AERI-LBLRTM QME results. Other observations/measurements impacted by this problem: This effects all QMEs and other analyses that use the AERI-01 data. Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) It is unlikely that this data can or will be corrected. REQUIRED ACTIONS: This report is informational no further action required____X_____ Experiment Center action required as follows: None Site Operations action required as follows: None Archive action required as follows: None |
Measurements: | sgpaeri01ch1C1.a1:
sgpaerilbldifflsC1.c1:
sgpaerilblcloudsC1.c1:
sgpaeri01summaryC1.a1:
sgpaeri01engineerC1.a1:
sgpaeri01ch2C1.a1:
sgpaerilbldiffC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/01/1995 | 0000 | 12/22/1995 | 0000 |
Subject: | Dust on the Scene Mirror |
DataStreams: | sgpaeri01ch1C1.a1 |
Description: | DQR No: Subject: Dust on the AERI-01 Scene Mirror Date Submitted: Submitted By: Robert Knuteson ___ Instrument Mentor ___ EST Member _X_ Science Team Member ___ Other _____________________________ Organization: University of Wisconsin - Madison Email address: robert.knuteson@ssec.wisc.edu Telephone: 608-263-7974 Platform/Measurement: What level data: (raw,a0,a1,b1,c1 etc): All levels including the following platforms: sgpaeri01ch1C1.a1 sgpaeri01ch2C1.a1 sgpaeri01summaryC1.a1 sgpaeri01engineerC1.a1 What location was the data collected at: ARM SGP CF Period(s) of time in question Period 1: Begin Date Sep/ 1/ 1995 Time 00:00 (GMT) End Date Dec/ 22/ 1995 Time 00:00 (GMT) Period 2: Begin Date Jan/ 18/ 1996 Time 00:00 (GMT) End Date Apr/ 9/ 1996 Time 00:00 (GMT) Data should be labeled: _X_ questionable ___ incorrect ___ wrong calibration ___ others _______________________________ Discussion of Problem: On April 25, 1995 the AERI-01 was installed in an enclosure protruding out the side of the optical trailer at the ARM SGP central facility. This configuration was a change from the AERI prototype setup which used a roof hatch and a "chimney". The reason for the new configuration was to place the AERI front end (scene mirrors and blackbodies) in an environment that was much closer in temperature to the outside ambient air. In that regard the change has been very successful. Unfortunately this configuration also exposes the AERI scene mirror to contamination by airborne dust. At the time of installation only a rough opening to the sky existed with a wooden hatch that was manually removed and replaced by site personnel during normal working hours. Most of the time the hatch remained closed. When the automatic hatch for the AERI-01 system in the ARM SGP CF optical trailer was installed in July 1995, the percentage of time which the hatch was open increased dramatically. Since that time there has been a slow accumulation of dust on the AERI-01 scene mirror. No routine maintenance (such as mirror cleaning) was defined since this dust was thought to be only a thoughput problem but not a calibration issue. However, analysis of the AERI/LBLRTM QME (comparison of observed radiances to model calculations) indicated that there was a problem with the AERI-01 observations during the October 1995 ARESE IOP. On Dec 20, 1995 personnel from UW-Madison visited the site and determined that the dust on the scene mirror was acting as a scattering surface which effectively broadened the conical field of view to the blackbodies and the sky. This "broadening" of the field of view would not have lead to a problem except for the fact that hatch opening is too small at it's current distance from the instrument to allow the full beam to exit the enclosure. Thus a fraction of the AERI field of view (the "tail" of the field) was viewing the ambient temperature area surrounding the hatch opening. This caused a mixture of ambient temperature emission into the scene, a fact that is readily apparent when the scene was of a clear, dry sky (such as in the ARESE IOP). Period 1 indicated above covers the period from the first of September 1995 when this effect began to be noticeable to December 22, 1995 after the scene mirror had been cleaned of dust contamination by UW-Madison personnel. In general the scattering effect is increasing with time as more and more dust accumulates on the scene mirror, but does show "events" linked to times when the automatic hatch does not close soon enough and rain drops fall on the scene mirror. These rain drops seem have the effect of both making the scattering surfaces more effective (thus worse) and at other times of actually partially cleaning the mirror if the rain is heavy enough. Period 2, unfortunately only 4 weeks later, began with a different type of "event" but leading to the same effect. On Jan 18, 1996 a major winter storm caused snow to accumulate on the AERI-01 scene mirror (another example when the automatic hatch did not work properly). When the snow melted it appears to have left a substantial residue on the scene mirror leading to an abrupt increase in the scattered energy contribution as described above. This "dirty" mirror condition persisted until UW-Madison personnel replaced the scene mirror on April 8, 1996. Since April 1996, the AERI-01 system has been operating in the previous manner; thus one can expect that the scene mirror has been accumulating dust up to the present time. To address this recurring problem, UW-Madison is developing a procedure that would allow the AERI-01 scene mirror to be cleaned by site personnel on a regular basis. In addition, automatic diagnostic information has been developed to identify this problem immediately and provide feedback to site (and post analysis) personnel. Furthermore, modifications of the AERI enclosure design are under investigation that should build in an immunity to this effect at all future AERI installations. Other observations/measurements impacted by this problem: This affects QMEs and other analyses that use the AERI-01 data that require absolute accuracy better than about 5%. Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) It is likely that this data can and will be corrected. The best approach to use in the correction is currently under investigation. REQUIRED ACTIONS: This report is informational no further action required_________ Experiment Center action required as follows: Distribution of a DQR to users of AERI data is recommended for the time periods described. Site Operations action required as follows: A schedule of cleaning for the central facility AERI scene mirror is recommended. A procedure for this task should be obtained from Fred Best of the University of Wisconsin - Madison combined with a training session on proper techniques. Archive action required as follows: None ------------------------------------------------------- |
Measurements: | sgpaeri01ch1C1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/18/1996 | 0000 | 04/09/1996 | 0000 |
Subject: | Dust on the Scene Mirror |
DataStreams: | sgpaeri01ch1C1.a1 |
Description: | DQR No: Subject: Dust on the AERI-01 Scene Mirror Date Submitted: Submitted By: Robert Knuteson ___ Instrument Mentor ___ EST Member _X_ Science Team Member ___ Other _____________________________ Organization: University of Wisconsin - Madison Email address: robert.knuteson@ssec.wisc.edu Telephone: 608-263-7974 Platform/Measurement: What level data: (raw,a0,a1,b1,c1 etc): All levels including the following platforms: sgpaeri01ch1C1.a1 sgpaeri01ch2C1.a1 sgpaeri01summaryC1.a1 sgpaeri01engineerC1.a1 What location was the data collected at: ARM SGP CF Period(s) of time in question Period 1: Begin Date Sep/ 1/ 1995 Time 00:00 (GMT) End Date Dec/ 22/ 1995 Time 00:00 (GMT) Period 2: Begin Date Jan/ 18/ 1996 Time 00:00 (GMT) End Date Apr/ 9/ 1996 Time 00:00 (GMT) Data should be labeled: _X_ questionable ___ incorrect ___ wrong calibration ___ others _______________________________ Discussion of Problem: On April 25, 1995 the AERI-01 was installed in an enclosure protruding out the side of the optical trailer at the ARM SGP central facility. This configuration was a change from the AERI prototype setup which used a roof hatch and a "chimney". The reason for the new configuration was to place the AERI front end (scene mirrors and blackbodies) in an environment that was much closer in temperature to the outside ambient air. In that regard the change has been very successful. Unfortunately this configuration also exposes the AERI scene mirror to contamination by airborne dust. At the time of installation only a rough opening to the sky existed with a wooden hatch that was manually removed and replaced by site personnel during normal working hours. Most of the time the hatch remained closed. When the automatic hatch for the AERI-01 system in the ARM SGP CF optical trailer was installed in July 1995, the percentage of time which the hatch was open increased dramatically. Since that time there has been a slow accumulation of dust on the AERI-01 scene mirror. No routine maintenance (such as mirror cleaning) was defined since this dust was thought to be only a thoughput problem but not a calibration issue. However, analysis of the AERI/LBLRTM QME (comparison of observed radiances to model calculations) indicated that there was a problem with the AERI-01 observations during the October 1995 ARESE IOP. On Dec 20, 1995 personnel from UW-Madison visited the site and determined that the dust on the scene mirror was acting as a scattering surface which effectively broadened the conical field of view to the blackbodies and the sky. This "broadening" of the field of view would not have lead to a problem except for the fact that hatch opening is too small at it's current distance from the instrument to allow the full beam to exit the enclosure. Thus a fraction of the AERI field of view (the "tail" of the field) was viewing the ambient temperature area surrounding the hatch opening. This caused a mixture of ambient temperature emission into the scene, a fact that is readily apparent when the scene was of a clear, dry sky (such as in the ARESE IOP). Period 1 indicated above covers the period from the first of September 1995 when this effect began to be noticeable to December 22, 1995 after the scene mirror had been cleaned of dust contamination by UW-Madison personnel. In general the scattering effect is increasing with time as more and more dust accumulates on the scene mirror, but does show "events" linked to times when the automatic hatch does not close soon enough and rain drops fall on the scene mirror. These rain drops seem have the effect of both making the scattering surfaces more effective (thus worse) and at other times of actually partially cleaning the mirror if the rain is heavy enough. Period 2, unfortunately only 4 weeks later, began with a different type of "event" but leading to the same effect. On Jan 18, 1996 a major winter storm caused snow to accumulate on the AERI-01 scene mirror (another example when the automatic hatch did not work properly). When the snow melted it appears to have left a substantial residue on the scene mirror leading to an abrupt increase in the scattered energy contribution as described above. This "dirty" mirror condition persisted until UW-Madison personnel replaced the scene mirror on April 8, 1996. Since April 1996, the AERI-01 system has been operating in the previous manner; thus one can expect that the scene mirror has been accumulating dust up to the present time. To address this recurring problem, UW-Madison is developing a procedure that would allow the AERI-01 scene mirror to be cleaned by site personnel on a regular basis. In addition, automatic diagnostic information has been developed to identify this problem immediately and provide feedback to site (and post analysis) personnel. Furthermore, modifications of the AERI enclosure design are under investigation that should build in an immunity to this effect at all future AERI installations. Other observations/measurements impacted by this problem: This affects QMEs and other analyses that use the AERI-01 data that require absolute accuracy better than about 5%. Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) It is likely that this data can and will be corrected. The best approach to use in the correction is currently under investigation. REQUIRED ACTIONS: This report is informational no further action required_________ Experiment Center action required as follows: Distribution of a DQR to users of AERI data is recommended for the time periods described. Site Operations action required as follows: A schedule of cleaning for the central facility AERI scene mirror is recommended. A procedure for this task should be obtained from Fred Best of the University of Wisconsin - Madison combined with a training session on proper techniques. Archive action required as follows: None |
Measurements: | sgpaeri01ch1C1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/10/1997 | 0000 | 06/23/1997 | 2359 |
Subject: | Software update on the AERI |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1 |
Description: | On June 10th, staff from the University of Wisconsin-Madison visited the SGP CART site to upgrade the software running on the AERI instrument. While there, they took the opportunity to perform some routine checks of the instrument. Due to these tests, data from 6/10/97 - 6/11/97 should not be ingested or used for scientific studies. The software installed was the same software as will be used on the next generation AERIs (AERI-Nexts). The AERI-Nexts have some improved hardware capabilities, which is taken advantage of by the new software. Unfortunately, as the AERI 01 at the CART site does not have these capabilities, NaNs resulted in a couple of fields in the sgpaeri01summaryC1.a1 platform. These NaNs are placeholders in arrays that were too long for the AERI01 but the correct length for the AERI-Nexts. All valid data (non-NaN data) is correct, and hence these NaNs should be ignored. A routine was modified on 6/24 which effectively fixes the problem (the size of the arrays written out is now determined by the hardware's capabilities, versus outputting a fixed length vector). |
Measurements: | sgpaeri01ch1C1.a1:
sgpaerilbldifflsC1.c1:
sgpaerilblcloudsC1.c1:
sgpaeri01summaryC1.a1:
sgpaeri01engineerC1.a1:
sgpaeri01ch2C1.a1:
sgpaerilbldiffC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/04/1997 | 0000 | 10/05/1997 | 2330 |
Subject: | AERI data effected by failing detector cooler |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerich1C1.a1, sgpaerich1C1.a2, sgpaerich2C1.a1, sgpaerich2C1.a2, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaerilbldiffssC1.c1, sgpaeriprofC1.c1, sgpaerisummaryC1.a1, sgpaerisummaryC1.a2, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerilblssC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaerimeansssC1.c1, sgpqmeaeriprofC1.c1, sgpaeriC1.00 |
Description: | The AERI mechanical (Stirling Cycle) detector cooler exhibited abnormal behavior during this time period which allowed the detector temperature to fluctuate outside of the normal limits. This cooler had successfully operated for over 21 months at this point, well beyond the expected lifetime before refurbishment. Only the longwave (channel 1) AERI data appears to be effected as the shortwave (channel 2) detector is less sensitive to changes in detector temperature. THE COOLER WAS REPLACED AT 23:00 UTC ON 5 OCTOBER 1997 with a spare by UW personnel who were on site for the WVIOP. |
Measurements: | sgpaeri01ch1C1.a1:
sgpaerich1C1.a2:
sgpaeri01engineerC1.a1:
sgpaerich2C1.a1:
sgpaerich2C1.a2:
sgpaeriprofC1.c1:
sgpaerilbldiffssC1.c1:
sgpaerich1C1.a1:
sgpqmeaerimeansC1.c1:
sgpaerilbldifflsC1.c1:
sgpqmeaerimeansssC1.c1:
sgpaeri01summaryC1.a1:
sgpaerilblcloudsC1.c1:
sgpqmeaerilblssC1.c1:
sgpaeri01ch2C1.a1:
sgpaerilbldiffC1.c1:
sgpaerisummaryC1.a1:
sgpaerisummaryC1.a2:
sgpqmeaerilblC1.c1:
sgpaeriC1.00:
sgpqmeaeriprofC1.c1:
sgpqmeaerilbllsC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/03/1997 | 1800 | 10/03/1997 | 2200 |
Subject: | Tumbleweed in AERI Field of View |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerich1C1.a1, sgpaerich1C1.a2, sgpaerich2C1.a1, sgpaerich2C1.a2, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaerilbldiffssC1.c1, sgpaeriprofC1.c1, sgpaerisummaryC1.a1, sgpaerisummaryC1.a2, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerilblssC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaerimeansssC1.c1, sgpqmeaeriprofC1.c1, sgpaeriC1.00 |
Description: | It's windy. It's Oklahoma. A tumbleweed somehow manages to fall into the AERI hatch and become lodged in the AERI sky view position. The AERI collects spectra of the tumbleweed until the problem is identified and corrected. In later processing this was shown to effect the AERI temperature retrievals during the period 18:00 - 22:00 UTC. |
Measurements: | sgpaeri01ch1C1.a1:
sgpaerich1C1.a2:
sgpaeri01engineerC1.a1:
sgpaerich2C1.a1:
sgpaerich2C1.a2:
sgpaeriprofC1.c1:
sgpaerilbldiffssC1.c1:
sgpaerich1C1.a1:
sgpqmeaerimeansC1.c1:
sgpaerilbldifflsC1.c1:
sgpqmeaerimeansssC1.c1:
sgpaeri01summaryC1.a1:
sgpaerilblcloudsC1.c1:
sgpqmeaerilblssC1.c1:
sgpaeri01ch2C1.a1:
sgpaerilbldiffC1.c1:
sgpaerisummaryC1.a1:
sgpaerisummaryC1.a2:
sgpqmeaerilblC1.c1:
sgpaeriC1.00:
sgpqmeaeriprofC1.c1:
sgpqmeaerilbllsC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/30/1997 | 1600 | 09/30/1997 | 1700 |
Subject: | CO2 Suppression of AERI Spectra |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerich1C1.a1, sgpaerich1C1.a2, sgpaerich2C1.a1, sgpaerich2C1.a2, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaerilbldiffssC1.c1, sgpaeriprofC1.c1, sgpaerisummaryC1.a1, sgpaerisummaryC1.a2, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerilblssC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaerimeansssC1.c1, sgpqmeaeriprofC1.c1, sgpaeriC1.00 |
Description: | At about 1600 UTC 30 September 1997 (970930), the CO2 fire suppression system in the optical trailer went off and AERI-01 detected a local cooling due to the colder air being forced out of the trailer. Over the next few minutes, the CO2 accumulated outside the trailer causing lower transmission to space in the 15 micron region and AERI-01 therfore detected warmer temperatures closer to the surface (T profile decreases with altitude). As more CO2 exited the trailer, the atmosphere at 15 microns became more and more opaque and AERI looses nearly all responsivity in this region. AERI gradually regains responsivity over the next 30 minutes or so as the CO2 diffuses. The strongest absorbing on-line regions from ~650-680 wavenumbers are the last to recover around 1700 UTC. A graphical description of the effect described can be found at: http://www.iop.sgp.arm.gov/~davet/970930/aeri01/index.html Besides the enhanced CO2, the instrument is effected by the rapid change of temperature of inside the optical trailer. This makes all the AERI data during the period 970930 16:00 - 17:00 UTC questionable. |
Measurements: | sgpaeri01ch1C1.a1:
sgpaerich1C1.a2:
sgpaeri01engineerC1.a1:
sgpaerich2C1.a1:
sgpaerich2C1.a2:
sgpaeriprofC1.c1:
sgpaerilbldiffssC1.c1:
sgpaerich1C1.a1:
sgpqmeaerimeansC1.c1:
sgpaerilbldifflsC1.c1:
sgpqmeaerimeansssC1.c1:
sgpaeri01summaryC1.a1:
sgpaerilblcloudsC1.c1:
sgpqmeaerilblssC1.c1:
sgpaeri01ch2C1.a1:
sgpaerilbldiffC1.c1:
sgpaerisummaryC1.a1:
sgpaerisummaryC1.a2:
sgpqmeaerilblC1.c1:
sgpaeriC1.00:
sgpqmeaeriprofC1.c1:
sgpqmeaerilbllsC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/01/1996 | 0000 | 06/30/1997 | 2359 |
Subject: | SGP/AERI/C1 - Reprocessed: radiance data |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01summaryC1.a1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1, sgpaeriprofC1.c1, sgplblch1C1.c1, sgplblch1lsC1.c1, sgplblch2C1.c1, sgplblch2lsC1.c1, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpaeri01C1.00 |
Description: | Due to a software error in the real-time calibration software, the AERI-01 radiance data between 10/96 and 6/97 were incorrectly calibrated. All of the AERI-01 radiance data collected at the SGP central facility during this time period was corrupted by this software error and were reprocessed to correct the radiance data. The error also affected all derived products of the AERI radiance data. AERI data collected prior to and after this time period was unaffected by this programming error. The proper calibrated radiance spectra was recovered from the raw archived dataset through post-processing. This reprocessing of the AERI data was carried out by the instrument mentor at PNNL and confirmed independently by Univ. of Wisconsin. The reprocessed AERI radiance data during the period 10/96 to 6/97 supercedes all previous versions of the AERI data in all instances. reprocessed, archived 9/99: sgpaeri01C1.00 reprocessed, archived 10/99: sgpaeri01ch1C1.a1 sgpaeri01ch2C1.a1 sgpaeri01engineerC1.a1 sgpaeri01summaryC1.a1 sgpaerilbldiffC1.c1 sgpaerilbldifflsC1.c1 sgplblch1C1.c0 sgplblch1C1.c1 sgplblch1lsC1.c0 sgplblch1lsC1.c1 sgplblch2C1.c0 sgplblch2C1.c1 sgplblch2lsC1.c0 sgplblch2lsC1.c1 sgpqmeaerilblC1.c1 sgpqmeaerilbllsC1.c1 sgpqmeaerimeansC1.c1 reprocessed, archived 11/99: sgpaeriprofC1.c1 sgpqmeaeriprofC1.c1 not reprocessed: sgpaerilblcloudsC1.c1 sgpaerilbldiffssC1.c1 sgpqmeaerilblssC1.c1 sgpqmeaerimeansssC1.c1 |
Measurements: | sgpaeri01ch1C1.a1:
sgplblch2lsC1.c1:
sgpaeriprofC1.c1:
sgpqmeaerimeansC1.c1:
sgplblch1lsC1.c1:
sgpaerilbldifflsC1.c1:
sgpaeri01summaryC1.a1:
sgpaeri01C1.00:
sgpaeri01ch2C1.a1:
sgpaerilbldiffC1.c1:
sgplblch2C1.c1:
sgpqmeaerilblC1.c1:
sgplblch1C1.c1:
sgpqmeaerilbllsC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/19/1999 | 1930 | 11/22/1999 | 1750 |
Subject: | SGP/AERI - AERI01 scene mirror motor failure |
DataStreams: | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilbldiffC1.c1, sgpaeriprofC1.c1, sgplblch1C1.c1, sgplblch1lsC1.c1, sgplblch2C1.c1, sgplblch2lsC1.c1, sgpqmeaerilblC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpqmeaeriprofC1.c1, sgpgaeriprofC1.c1, sgpaeri01C1.00 |
Description: | During this time interval, the AERI scene mirror motor control was not operating, resulting in a complete loss of spectral radiance data including any associated brightness temperatures. This data should not be used. |
Measurements: | sgplblch2lsC1.c1:
sgpaeri01ch1C1.a1:
sgpaeri01engineerC1.a1:
sgpaeriprofC1.c1:
sgpqmeaerimeansC1.c1:
sgplblch1lsC1.c1:
sgpgaeriprofC1.c1:
sgpaeri01summaryC1.a1:
sgpaeri01C1.00:
sgpaeri01ch2C1.a1:
sgpaerilbldiffC1.c1:
sgplblch2C1.c1:
sgpqmeaerilblC1.c1:
sgplblch1C1.c1:
sgpqmeaeriprofC1.c1:
sgpqmeaerilbllsC1.c1:
|