| 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 |
| D960701.3 | Obstruction in the AERI-01 Enclosure | sgpaeri01ch1C1.a1, sgpaeri01ch2C1.a1, sgpaeri01engineerC1.a1, sgpaeri01summaryC1.a1, sgpaerilblcloudsC1.c1, sgpaerilbldiffC1.c1, sgpaerilbldifflsC1.c1 |
| D960729.1 | Reprocess: LBLRTM and AERI/LBL QME data | sgpaerilbldiffC1.c1, sgplblch1C1.c1, sgplblch2C1.c1, sgpqmeaerilblC1.c1, sgpqmeaerimeansC1.c1 |
| 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 |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 04/01/1994 | 0000 | 04/09/1996 | 2359 |
| Subject: | Reprocess: LBLRTM and AERI/LBL QME data |
| DataStreams: | sgpaerilbldiffC1.c1, sgplblch1C1.c1, sgplblch2C1.c1, sgpqmeaerilblC1.c1, sgpqmeaerimeansC1.c1 |
| Description: | DQR No:
Subject: LBLRTM and AERI/LBL QME data
Date Submitted: 7/2/96
Submitted By: Tim Shippert
___ Instrument Mentor
_X_ EST Member
___ Science Team Member
___ Other _____________________________
Organization: PNNL
Email address: tr_shippert@pnl
Telephone: 509-375-5997
Platform/Measurement:
LBLRTM model runs:
sgplblch1C1.c1
sgplblch2C1.c1
AERI/QME output:
sgpqmeaerilblC1.c1
sgpqmeaerimeansC1.c1
sgpaerilbldiffC1.c1
What level data: (raw,a0,a1,b1,c1 etc): c1
What location was the data collected at: SGP
Period of time in question
Begin Date 4/1/94
End Date current
Data should be labeled:
___ questionable
___ incorrect
___ wrong calibration
_X_ other: Usefulness of data is limited to instrument validation and
the evaluation of atmospheric state measurements, and
should not be used for the study of radiative transfer
modeling issues
Discussion of Problem:
The AERI/LBLRTM QME, which compares the output of the Line by
Line Radiative Transfer Model (LBLRTM) with the spectra measured by
the Atmospheric Emitted Radiance Interferometer (AERI) at the SGP CART
Central Facility, has been successful in identifying and assessing
problems with the measurement of downwelling spectral radiation and
the characterization of the atmosphere in the radiating column, but
there are serious concerns regarding the use of this data for
understanding and addressing radiative transfer modeling issues by the
scientific community. There are three main purposes of the QME:
(1) To improve modeling of radiative transfer;
(2) To assess the ability to measure high-resolution
downwelling radiation, in particular from the AERI
instrument;
(3) To assess the ability to characterize the atmosphere in
the radiating column, including water vapor.
The AERI/LBL QME has been instrumental in finding numerous
problems with (2) and (3), as seen in the attached timeline. Because
the AERI and sonde data are being released, it is important to
identify issues related to these datasets, which can be accomplished
using the AERI/LBLRTM QME. Therefore, the QME is a useful tool for
validating and establishing data quality for the instrument data
streams. As a result the QME process, difficulties associated with
ARM-style automated data collection are identified.
Because of the difficulties associated with the measurement of
spectral radiance and, most importantly, that characterization of
water vapor as part of the atmospheric state, the QME has been unable
to contribute to the improvement in radiative transfer modeling.
Therefore, the QME data should not be used as a basis for improvements
to radiative transfer models; the magnitude of the residuals due to
errors in the determination of the atmospheric path in the radiating
column are larger than those due to modeling error.
The following are periods of time which may be used for
general analyis of spectral radiance measurements:
(a) 5/94-12/94
This period was prior to the time period which has
been identified as containing radiosonde launches with
the Vaisala sonde calibration problem. The AERI00 data
has been reprocessed to correct for the field of view
obscuration. However, pseudo-Vaisala processing of
sonde data was used through 5/21/94. Therefore,
the model validations and the associated QME data
should be treated seperately from other time periods.
(b) 7/95-8/95
This period was prior to the time in which the dust on
the AERI01 mirror impacted the data. Some sondes
during this period have the Vaisala correction
problem, which are identifiable using serial
numbers. The MPL data is questionable due to issues of
dust and wear, which impacts the ability to determine
clear sky cases.
(c) 1/96-3/96
The mirror on the AERI01 was replaced, but the data quality
is currently unknown. The MPL00 data has the same
problems as in (b). Most importantly, the MWR was not
running during this period, so we have no comparisons
with sondes and our ability to detect clouds from
liquid water is limited.
(d) recent data from 4/96 on
A new "improved" mirror was put in the AERI01 in April '96
(data quality still unknown, however), and the MPL02 came
on line in May. Data from this period looks good;
however it has not been as throroughly analyzed as
older data, and potential problems have not had as
much time to surface.
-----
The following paragraphs summarize the problems and issues with the
instrument datasets related to the LBLRTM model runs.
AERI
----
The sporadic LN2 loss in the AERI00 dewar from April, 1994 through
July 25, 1995 is manifested in the gradual increase in noise into the
AERI00 measured spectrum, ultimately manifested by a Planck function
spectrum of the detector temperature as the detector warms upon running out
of the N2 coolant. These spectra were included in the data distribution of
the AERI00 spectra as well as the QME validations with LBLRTM, although
during subsequent reprocessing caused by the FOV problem (see next
paragraph) these samples have been flagged in the AERI data and skipped by
the QME. The current AERI01 instrument makes use of a stirling cooler and
no longer requires an LN2 dewar.
The field of view of the AERI was partially obscured from April,
1994 through July 6, 1995, which resulted in a several percent increase on
measured radiance [Knuteson, et al., 1995]. The effect of this obstruction
has been removed from the spectral measurements, and both the AERI and
AERI/LBLRTM QME data has been reprocessed and redistributed. Use of the
original, uncorrected data is not advised.
The accumulation of dust on the AERI01 collection mirror over the
period 9/1/95 through 12/22/95 resulted in an obscuration which may be
similar in nature to that of the AERI00 obstruction. A similar effect has
been identified over the period 1/18/96-4/9/96. The data has not been
corrected, although efforts are underway to remove the effect of the dust
from the radiance spectra. It is advised that the AERI01 data over these
time periods not be used for scientific study prior to reprocessing (see
AERI DQR #'s P960715.1 and P960715.2).
MWR
---
Other measurement datasets related to the AERI/LBLRTM QME studies
have been identified as having problems in certain time
periods. Temperature calibration issues in the MWR from 4/94 through 12/94
are being addressed, though the data which is currently released reflects
incorrect calibration coefficients.
The processing of MWR measured brightness temperatures in the
retrieval of total water vapor and total liquid water has changed starting
3/1/96, which has resulted in improved agreement between the column water
vapor product from the MWR platform and the retrieved total water vapor
which is done as part of the MWR/LBLRTM QME in conjunction with the
AERI/LBLRTM QME.
BBSS
----
The AERI/LBLRTM QME studies have identified several issues with the
radiosonde data. The nominal Vaisala processing of the raw radiosonde data
from 4/94 through 5/21/94 was not done, which resulted in the use of the
unprocessed data in the validations of the line by line model with the
radiance measurements and release of QME data. The radiosonde data was
subsequently processed using software written at PNL which intended to
mimick the Vaisala proprietary alogrithms, and the validations and QME
products were rerun. The model calculations and QME data for this time
period should be treated distinctly from those of subsequent time periods
as a result of the differing radiosonde processing software.
From 4/94 to 8/3/94, ground checks were routinely applied to
nominal BBSS PTU data. These ground checks were removed before using the
data as input to the LBLRTM. From 4/94 through 5/21/94, the period
described in the above paragraph, ground checks were removed as part of the
pseudo-Vaisala processing. From 5/21/94 to 8/3/94, the ground checks were
removed from the Vaisala nominal data by a seperate post-ingest routine.
After 8/3/94, ground checks were no longer applied to nominal BBSS data.
Over the time period of 1/20/94 through 9/22/95, some radiosondes
launched were incorrectly calibrated by Vaisala at the factory and
incorrectly measured water vapor through the atmosphere. This data,
including the model validations and QME products, cannot be corrected and
should not be used. For more information, including the serials numbers of
those sondes affected, refer to the DQR submitted 2/28/96 by Barry Lesht,
the instrument mentor.
In addition, some studies [Clough et al., 1996; Whitney et al.,
1996] have indicated that the radiosonde measurements contain systematic
errors in observing water vapor through the atmospheric path, and that
these errors are the largest source of disagreement between the line by
line model and the spectral radiance measurement.
----
The following is a timeline of most of the data streams related to
the AERI/LBL QME. It graphically illustrates just how many things can
affect the QME. The timeline table is 172 columns wide, so you will
probably need to resize your window or print it out in landscape mode to
see it completely:
ARM AERI/LBLRTM QME Timeline
MPL00 Era
MPL02 Era
_____________________________________________________________|____________________________________________________________________________________________ ____|____
|
| |
MWR in datastream (S/N 010)
MWR in datastream
_________________________________________________|_______________________________________________________________ ______________________|___________
|
| |
AERI01 Era
AERI00 Era _ _ _ _ _ _ _ _ _ _ _ _
_______________________________________|__________________________________________________________________
_________________________________|____|________________________|_______
| |
4/94 12/94 4/17/95 5/7/95 7/6/95 7/31/95
9/1/95 10/95 12/1/95 1/18/96 3/15/96 4/16/96 5/10/96
|-----|----/-----|------|-------|------|-------|-------|--------|-------|-----|------|-----|------|------|---|----|----|-------|-------|-------|------|----|----|----|--->
5/21/94 1/20/95 4/26/95 5/31/95 7/25/95
8/28/95 9/22/95 11/1/95 12/22/95 3/1/96 4/9/96 4/20/96
|______________| |___________|
|__________| |______________|
| |
| |
SCM IOP SCM IOP (7/17-8/6)
ARESE IOP (O3 sondes) IOP
|_______________________________________________________________________|
|
Sporadic AERI00 LN2 Dewar fill problem
|_______________________________________________________________|__________________________|___________________________|_______|______________________|___________________
| |
| | | |
AERI00 FOV obscuration (corrected) Mirror #1
Dust on mirror #1 Mirror #2 Residue on mirror #2 Mirror #3
|_____|
|_________________________________________________________________________|
| |
Pseudo-Vaisala Vaisala Calibration Problem (Central Facility)
Processing (no correction)
|________________|
|__________________________________
|
|
MWR Calibration Problem
Change in MWR data product processing
(to be reprocessed)
|_____________________________________________________________________________________________|
|
MPL00 Data Questionable (wear/dust issues)
References:
Knuteson, R., B. Whitney, H. Revercomb, & F. Best. (1995). The
history of the University of Wisconsin Atmospheric Radiance
Interferometer (AERI) prototype during the period April 1994 through
July 1995. (Technical Report with ARM PIF #'s P950525.4 and
P950224.1). University of Wisconsin-Madison.
Clough, S.A., P.D. Brown, J.C. Liljegren, T.R. Shippert, &
D.D. Turner. (1996) Implications for atmospheric state specification
from the AERI/LBLRTM QME and the MWR/LBLRTM QME. Proceedings of the
Sixth Atmospheric Measurement Program (ARM) Science Team Meeting.
Whitney, B.A., H.E. Revercomb, R.O. Knuteson, F.A. Best, and
W.L. Smith. (1996). Atmospheric Emitted Radiance Interferometer
(AERI), part II: Water vapor and atmospheric aerosols. Proceedings of
the Sixth Atmospheric Measurement Program (ARM) Science Team Meeting.
Suggested Corrections of the Problem:
AERI/LBL QME Data should be released only with this DQR attached.
Tim Shippert tr_shippert@pnl.gov
(509) 375-5997
FAX: (509) 375-3641 |
| Measurements: | sgpaerilbldiffC1.c1:
sgpqmeaerimeansC1.c1:
sgplblch2C1.c1:
sgpqmeaerilblC1.c1:
sgplblch1C1.c1:
|
| 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:
|