| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D040526.2 | SGP/AERI/C1 - Metadata errors | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpqmeaerilblC1.c1, sgpaerilbldiffC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldifflsC1.c1, sgpaeri01engineerC1.a1 |
| D040527.1 | SGP/AERI/C1 - Time Offset Corrected | sgpaeriprofC1.c1, sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpgaeriprofC1.c1, sgplblch1aeriC1.c1, sgplblch2aeriC1.c1, sgpqmeaerilblC1.c1, sgpaerilbldiffC1.c1, sgpqmeaeriprofC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldifflsC1.c1, sgpaeri01engineerC1.a1 |
| D040805.4 | SGP/AERI/B1 - Increased radiative uncertainty during hot summer afternoons | sgpaerich1B1.a1, sgpaerich2B1.a1 |
| D040816.1 | SGP/AERI/C1 - Data Reprocessed to correct laser wavenumber | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1 |
| D060928.3 | SGP/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry | sgpsondewnpnC1.b1 |
| 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, sgpqmeaerilblC1.c1, sgpaerilbldiffC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldifflsC1.c1, sgpaeri01engineerC1.a1 |
| 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: | sgpaeriprofC1.c1, sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpgaeriprofC1.c1, sgplblch1aeriC1.c1, sgplblch2aeriC1.c1, sgpqmeaerilblC1.c1, sgpaerilbldiffC1.c1, sgpqmeaeriprofC1.c1, sgpqmeaerilbllsC1.c1, sgpqmeaerimeansC1.c1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldifflsC1.c1, sgpaeri01engineerC1.a1 |
| 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 |
|---|---|---|---|
| 12/15/1998 | 1707 | 10/12/2003 | 2359 |
| Subject: | SGP/AERI/B1 - Increased radiative uncertainty during hot summer afternoons |
| DataStreams: | sgpaerich1B1.a1, sgpaerich2B1.a1 |
| Description: | The ambient temperature of the AERI enclosures at the boundary facilities often exceeded 308 K during hot summer afternoons. This threshold marked the maximum end of the "acceptable" range of temperatures that the ambient blackbody should maintain. The issue is that if the hot blackbody and ambient blackbody temperatures are too close together, then the radiative calibration becomes more uncertain. It should be noted that the hot blackbody's temperature is maintained at roughly 333 K. Using the calibration equation, an uncertainty analysis was performed to see how much "additional" uncertainty resulted in the AERI observations when the ambient temperature was between 308-315 K (315 K was the maximum temperature that the ambient blackbody reached during the summer). The analysis compared the radiative uncertainties from the Hillsboro (B1) AERI (chosen at random) with the AERI-01 at the SGP/CF over a 5-year period. Plot1 (below) shows the time-series of ambient blackbody temperatures for the two instruments, along with histograms to show the distribution of the temperatures. The boundary facility instrument did suffer from higher temperatures in the summer time periods. Plot2 (bleow) shows the relative radiative uncertainty for each instrument. The CF instrument has a maximum radiative uncertainty of around 0.18% during the summer, while the BF instrument's maximum radiative uncertainty is about 0.25%. This plot demonstrates that the radiative uncertainty is significantly larger for the BF instrument in the summer relative to the CF instrument. However, the absolute radiative accuracy for the AERI is specified to be better than 1% of the ambient radiance, and both the CF and the BF AERIs are well within this uncertainty. In short, there is significantly higher radiative uncertainty in the BF AERIs during the hot summer afternoons, but the uncertainty is well within the specified accuracy of the instrument. plot1: aeri_abb_temp.lamont_hillsboro.png plot2: aeri_relative_error.lamont_hillsboro.png |
| Measurements: | sgpaerich2B1.a1:
sgpaerich1B1.a1:
|
| 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 |
|---|---|---|---|
| 09/28/2006 | 1728 | 12/31/9999 | 2359 |
| Subject: | SGP/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry |
| DataStreams: | sgpsondewnpnC1.b1 |
| Description: | The output precision of the following variables was increased 20060928 alt changed from 1m to 0.1m dp changed from 0.1degC to 0.01degC pres changed from 0.1 hPa to 0.01 hPa RH changed from 1%RH to 0.01%RH tdry changed from .1degC to 0.01degC Note that the increase in precision does not necessarily imply an increase in accuracy. Users are cautioned to continue to use their best scientific judgement when using these or any other data. |
| Measurements: | sgpsondewnpnC1.b1:
|
