| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000514.4 | SGP/SIROS/E13 - occasional spikes in readings | DsgpsirosE13.00, sgpsirosE13.a1 |
| D020620.50 | SGP/SIROS/E13 - wrong units for broadband irradiance | sgpsirosE13.a1 |
| D940805.4 | SIROS April IOP data | sgpsirosE13.a1 |
| D940822.2 | SIROS 10M Data Release | sgpsirosE13.a1 |
| D951130.2 | Ventilated Pyrgeometer Case Temp Header Units Incorrect | sgpsirosE13.a1 |
| D960423.9 | SGP/SIROS/E13 - Wrong units for broadband irradiance | sgpsirosE13.a1 |
| D960501.2 | SGP/SIROS - wrong units for broadband irradiance | sgpsirosE1.a1, sgpsirosE10.a1, sgpsirosE11.a1, sgpsirosE12.a1, sgpsirosE13.a1, sgpsirosE15.a1, sgpsirosE16.a1, sgpsirosE18.a1, sgpsirosE20.a1, sgpsirosE22.a1, sgpsirosE24.a1, sgpsirosE3.a1, sgpsirosE4.a1, sgpsirosE7.a1, sgpsirosE8.a1, sgpsirosE9.a1 |
| D960602.3 | Level of pyranometer for global solar was slightly off | sgpsirosE13.a1 |
| D960914.7 | time stamp error | sgpsirosE13.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/11/1993 | 0000 | 09/10/1994 | 0000 |
| Subject: | SGP/SIROS/E13 - occasional spikes in readings |
| DataStreams: | DsgpsirosE13.00, sgpsirosE13.a1 |
| Description: | Since installation of this SIROS site to the dates specified, negative spikes occurred in the data streams indicated, especially up_short_hemisp, down_short_hemisp, down_long_diffuse_hemisp, and short_direct_normal. These spikes were induced by electrical interference from the fence that was used to keep out cattle. The spikes were eliminated by moving the fence further away from the SIROS sensors in September 1994. An assessment by Mike Split on the effects of the spikes indicated that the spikes superimposed on the readings ranged from -10 to -100 W m^-2. As many as 40 per day could occur. As a result of these spikes, the daily average reading of irradiance could be reduced by as much as 1 W m^-2, a half-hour average could be reduced by as much as 2 W m^-2, and a 5-min average could be affected by as much as 5 W m^-2. |
| Measurements: | sgpsirosE13.a1:
DsgpsirosE13.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/1994 | 2042 | 01/23/1996 | 2359 |
| Subject: | SGP/SIROS/E13 - wrong units for broadband irradiance |
| DataStreams: | sgpsirosE13.a1 |
| Description: | Headers for SIROS, MFR25m and MFR10m give the units for broadband irradiance as 'watts per square meter' (W/M^2). However, the units are really 'counts'. The fields affected are SIROS: 'hemisp_broadband:units' 'diffuse_hemisp_broadband:units' 'direct_norm_broadband:units' MFR: 'mfr_up_hemisp_broadband:units' This problem has existed since the beginning of the data streams, and was corrected by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed P960229.2) |
| Measurements: | sgpsirosE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/09/1994 | 0000 | 05/01/1994 | 2359 |
| Subject: | SIROS April IOP data |
| DataStreams: | sgpsirosE13.a1 |
| Description: | This DQR needs to accompany SIROS data release from the Central
Facility. The SIROS data release is for the time period of the
April IOP, 1994.
Subject: SIROS April IOP data
Name: Trevor Ley (SRRB\NOAA) Instrument Mentor Dr. John DeLuisi
Email address: trevor@srrb.erl.gov
Telephone: (303) 497-7315
Institution: SRRB\NOAA
Platform/Measurement: SIROS E13 (All)
what level data: all
period of time in question
April IOP
Data should be labeled: Just be aware that the electric fence
may cause minor downspikes at times in
all instrumentation
Discussion of Problem: The electric fence surrounding the SIROS
platform can cause minor downspikes in the
data.
Other observations/measurements impacted by this problem:
REQUIRED ACTIONS:
This report is informational no further action required
Experiment Center action required as follows:
Supply with SIROS E13 data April IOP, 1994 release.
-------------------------------------------------------
TO BE FILLED IN UPON COMPLETION OF ACTION ABOVE:
Action Taken:
Experiment Center:
Site Operations:
Archive:
EST:
-----------------------------------------------------------------
END |
| Measurements: | sgpsirosE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/26/1994 | 0000 | 08/18/1994 | 1855 |
| Subject: | SIROS 10M Data Release |
| DataStreams: | sgpsirosE13.a1 |
| Description: | This DQR needs to accompany SIROS 10 meter tower data release
from the Central Facility. The SIROS 10 meter tower data release
is for the time period between August 18 and April 26, 1994.
Subject: SIROS 10M Data Release (April 26 thru August 18, 1994)
Name: Trevor Ley (SRRB\NOAA) Instrument Mentor Dr. John DeLuisi
Email address: trevor@srrb.noaa.gov
Telephone: (303) 497-7315
Institution: SRRB\NOAA
Platform/Measurement: 10 meter tower upwelling PIR
what level data: .a1 and .a0
period of time in question
start: April 26, 1994 at 00:00:00 (GMT)
end: August 18,1994 at 18:15:55 (GMT)
Data should be labeled:
- Incorrect
Discussion of Problem:
- The preamp on the upwelling PIR signal was bad.
During investigation of the raw data files, it was
found that the UPIR signal was reading too high
(2050-2200).
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: None
REQUIRED ACTIONS:
This report is informational no further action required
Experiment Center action required as follows:
Supply with SIROS 10m data release (April 26 thru August 18, 1994)
-------------------------------------------------------
TO BE FILLED IN UPON COMPLETION OF ACTION ABOVE:
Action Taken:
Experiment Center:
Site Operations:
Archive:
EST:
-----------------------------------------------------------------
END |
| Measurements: | sgpsirosE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/12/1994 | 0000 | 04/15/1994 | 2359 |
| Subject: | Ventilated Pyrgeometer Case Temp Header Units Incorrect |
| DataStreams: | sgpsirosE13.a1 |
| Description: | DQR No: Platform: SIROS
Subject: Ventilated Pyrgeometer Case Temperature Header Units
(SIROS) at Central Facility
Date Submitted: 11/30/95
Submitted By: Joyce Tichler for _X_ Instrument Mentor
Trevor Ley ___ 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:SIROS
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 01/12/94 Time (GMT)
End Date 04/15/94 Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
___ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The data Header for the Ventilated Pyrgeometer case temperature
on the SIROS platform at the Central Facility is incorrect. At
the present time the units are Watts/M2 and it should be degrees
C.
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.)
Data Processing Notes Date |
| Measurements: | sgpsirosE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/1994 | 2042 | 01/23/1996 | 2359 |
| Subject: | SGP/SIROS/E13 - Wrong units for broadband irradiance |
| DataStreams: | sgpsirosE13.a1 |
| Description: | Headers for SIROS, MFR25m and MFR10m give the units for broadband irradiance as 'watts per square meter' (W/m^2). However, the units are really 'counts'. The fields affected are SIROS: 'hemisp_broadband:units' 'diffuse_hemisp_broadband:units' 'direct_norm_broadband:units' MFR: 'mfr_up_hemisp_broadband:units' This problem has existed since the beginning of the data streams, and was corrected by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed P960229.2) |
| Measurements: | sgpsirosE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/1994 | 0000 | 01/23/1996 | 2359 |
| Subject: | SGP/SIROS - wrong units for broadband irradiance |
| DataStreams: | sgpsirosE1.a1, sgpsirosE10.a1, sgpsirosE11.a1, sgpsirosE12.a1, sgpsirosE13.a1, sgpsirosE15.a1, sgpsirosE16.a1, sgpsirosE18.a1, sgpsirosE20.a1, sgpsirosE22.a1, sgpsirosE24.a1, sgpsirosE3.a1, sgpsirosE4.a1, sgpsirosE7.a1, sgpsirosE8.a1, sgpsirosE9.a1 |
| Description: | Headers for SIROS, give the units for broadband irradiance as 'watts per square meter' (w/m^2). However, the units are really 'counts'. The fields affected are: 'hemisp_broadband:units' 'diffuse_hemisp_broadband:units' 'direct_norm_broadband:units' This problem existed since the beginning of the data streams, and was corrected on 1/23/96. |
| Measurements: | sgpsirosE24.a1:
sgpsirosE13.a1:
sgpsirosE18.a1:
sgpsirosE4.a1:
sgpsirosE7.a1:
sgpsirosE16.a1:
sgpsirosE8.a1:
sgpsirosE12.a1:
sgpsirosE9.a1:
sgpsirosE15.a1:
sgpsirosE3.a1:
sgpsirosE22.a1:
sgpsirosE11.a1:
sgpsirosE10.a1:
sgpsirosE20.a1:
sgpsirosE1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/1994 | 0000 | 12/06/1994 | 1313 |
| Subject: | Level of pyranometer for global solar was slightly off |
| DataStreams: | sgpsirosE13.a1 |
| Description: | DQR No: Platform: sgpsiros13
Subject: Level of pyranometer for global solar was slightly off
Date Submitted: 6/1/96
Submitted By: Marv Wesely ___ Instrument Mentor
___ EST Member
___ Science Team Member
_x_ Other __IT leader__
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc):
All levels of sgpsiros13, but only for down_short_hemisp.
What location was the data collected at:
Period of time in question
Begin Date 01/06/94
End Date 12/06/94 Time 06:00 (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
___ incorrect _x_ Only some data fields affected
___ wrong calibration
_x_ others
Discussion of Problem:
Analysis of SIROS data from the central facility has indicated
that the pyranometer (or PSP) used for global (solar) irradiance
observations appeared to be slightly off level until site operations
personnel re-leveled the sensor on Dec. 6, 1994. Calculations suggest
that the sensor was leaning roughly toward the east by about 1.2 degrees.
Comparisons to the nearby BSRN pyranometer ("psp2") show that the
SIROS sensor was reading to high in the morning by as much as 5% and
too small in the late afternoon by about the same percentage.
Little, if any, effect was seen between 1700 and 2100 UTC (in
November), and the effect was be practically zero under cloudy
skies.
Users of the data could conceivable adjust the data (down_short_hemisp
for sgpsiros13) with the direct-beam SIROS or BSRN observation and
values of the solar zenith and azimuth angles, which would need to
be computed, and some fairly straighforward geometry calculations.
Possibly an easier course of action is to rely on the BSRN observation
of global solar radiation for small solar elevation angles.
(This analysis was conducted by John DeLuisi and colleagues
in 1994 but was not documented with a DQR. Some recent
discussions I have had with Science Team members have indicated
that they have seen this problem also.)
Other observations/measurements impacted by this problem:
None.
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Ideally, this note would be sent Send to people who received SIROS13
data for dates before Dec. 6, 1994, and the appropriate data in the
archive would be flagged with this comment. |
| Measurements: | sgpsirosE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/06/1994 | 0000 | 07/19/1996 | 2359 |
| Subject: | time stamp error |
| DataStreams: | sgpsirosE13.a1 |
| Description: | The internal code that runs the MFRSR data logger had a bug that occasionally caused the time stamp associated with the data to be slightly in error. This error is thought to be very small (say less than 30 seconds) and very infrequent. (Unfortunately, we cannot give firm estimates of the magnitude and frequency of the error). After 96/07/19 the problem was corrected. Those who use the data before this time should realize that the time stamp for each record of data might be slightly in error. |
| Measurements: | sgpsirosE13.a1:
|