SGP/SIRS - Reprocess: truncated first records

The following data files contain data from 1998 but
were originally archived with file names with dates
years into the future.  The files were renamed per 
P011213.1-P011213.10, but the cause of the misnaming 
(truncated first records) was not fixed.

sgpsirsE1.01.981125.000000.raw.9811252359.sneak.v0
sgpsirsE1.01.981127.000000.raw.9811272359.sneak.v0
sgpsirsE1.01.981128.000000.raw.9811282359.sneak.v0
sgpsirsE1.01.981130.000000.raw.9811302359.sneak.v0
sgpsirsE1.01.981201.000000.raw.9812012359.sneak.v0
sgpsirsE1.01.981204.000000.raw.9812042359.sneak.v0
sgpsirsE1.01.981205.000000.raw.9812052359.sneak.v0
sgpsirsE2.01.981125.000000.raw.9811250536.sneak.v0
sgpsirsE2.01.981201.000000.raw.9812012359.sneak.v0
sgpsirsE2.01.981202.000000.raw.9812022359.sneak.v0
sgpsirsE2.01.981205.000000.raw.9812052359.sneak.v0
sgpsirsE3.01.981126.000000.raw.9811262359.sneak.v0
sgpsirsE3.01.981128.000000.raw.9811282359.sneak.v0
sgpsirsE3.01.981129.000000.raw.9811292359.sneak.v0
sgpsirsE3.01.981130.000000.raw.9811302359.sneak.v0
sgpsirsE3.01.981201.000000.raw.9812012359.sneak.v0
sgpsirsE3.01.981203.000000.raw.9812032359.sneak.v0
sgpsirsE3.01.981204.000000.raw.9812042359.sneak.v0
sgpsirsE3.01.981208.000000.raw.9812082359.sneak.v0
sgpsirsE4.01.981126.000000.raw.9811262359.sneak.v0
sgpsirsE4.01.981127.000000.raw.9811272359.sneak.v0
sgpsirsE4.01.981129.000000.raw.9811292359.sneak.v0
sgpsirsE4.01.981201.000000.raw.9812012359.sneak.v0
sgpsirsE4.01.981202.000000.raw.9812022359.sneak.v0
sgpsirsE4.01.981204.000000.raw.9812042359.sneak.v0
sgpsirsE4.01.981208.000000.raw.9812082359.sneak.v0
sgpsirsE5.01.981126.000000.raw.9811262359.sneak.v0
sgpsirsE5.01.981201.000000.raw.9812012359.sneak.v0
sgpsirsE5.01.981202.000000.raw.9812022359.sneak.v0
sgpsirsE5.01.981205.000000.raw.9812052359.sneak.v0
sgpsirsE5.01.981206.000000.raw.9812062359.sneak.v0
sgpsirsE6.01.981127.000000.raw.9811272359.sneak.v0
sgpsirsE6.01.981129.000000.raw.9811292359.sneak.v0
sgpsirsE6.01.981202.000000.raw.8911010456.sneak.v0
sgpsirsE6.01.981203.000000.raw.9812032359.sneak.v0
sgpsirsE6.01.981204.000000.raw.9812042359.sneak.v0
sgpsirsE7.01.981201.000000.raw.9812012359.sneak.v0
sgpsirsE7.01.981202.000000.raw.9812022359.sneak.v0
sgpsirsE7.01.981204.000000.raw.9812042359.sneak.v0
sgpsirsE7.01.981205.000000.raw.9812052359.sneak.v0
sgpsirsE7.01.981206.000000.raw.9812062359.sneak.v0
sgpsirsE7.01.981207.000000.raw.9812072359.sneak.v0
sgpsirsE8.01.981127.000000.raw.9811272359.sneak.v0
sgpsirsE8.01.981129.000000.raw.9811292359.sneak.v0
sgpsirsE8.01.981130.000000.raw.9811302359.sneak.v0
sgpsirsE8.01.981203.000000.raw.9812032359.sneak.v0
sgpsirsE8.01.981205.000000.raw.9812052359.sneak.v0
sgpsirsE9.01.981126.000000.raw.9811262359.sneak.v0
sgpsirsE9.01.981201.000000.raw.9812012359.sneak.v0
sgpsirsE9.01.981203.000000.raw.9812032359.sneak.v0
sgpsirsE9.01.981204.000000.raw.9812042359.sneak.v0
sgpsirsE9.01.981205.000000.raw.9812052359.sneak.v0
sgpsirsE9.01.981210.000000.raw.9812102359.sneak.v0
sgpsirsE10.01.981121.000000.raw.9811212359.sneak.v0
sgpsirsE10.01.981123.000000.raw.9811232359.sneak.v0
sgpsirsE10.01.981126.000000.raw.9811262359.sneak.v0
sgpsirsE10.01.981202.000000.raw.9812022359.sneak.v0

• Raw data stream - documentation not supported

• Raw data stream - documentation not supported

• Raw data stream - documentation not supported

SGP/SIRS/E7 - Unknown problem with downwelling shortwave instrument (Eppley PSP)

Beginning around 0317 UTC, 11/21, downwelling shortwave values became anamolously high 
during the night, when they should have been around zero. Values returned to normal after 
SGP technicians reseated this instruments connections at 1215UTC 12/02/2003.  The following 
day's data appeared normal.  Appears that a poor connection was the culprit this time.

• Raw data stream - documentation not supported

SGP/SIRS/E1/E2/E3/E5/E8 - Snow on Radiometers

A large discrepancy between the measured values of downwelling hemispheric shortwave 
radiation and the derived values occurred on 2/02 at the listed sites.  The difference is on 
the order of 200 Wm^(-2) at E2 and to a lesser extent at the other affected stations.  
This problem most likely resulted from a previous day or night snow/ice accumulation on 
the Direct(NIP), Downwelling Sortwave(PSP) and/or  Downwelling Diffuse(8-48) instruments.  
During the morning hours of 02/02, Approx 1300-2000GMT, snow/ice was covering one or more 
of these three instruments resulting in faulty readings and incorrect derived 
downwelling shortwave values as well.  Instrument readings indicate the problem resolved itself 
later in the day through normal meltoff.

• Raw data stream - documentation not supported

SGP/SIRS/E8 - Possible Contamination of DS PSP instrument

Downwelling hemispheric shortwave values drop at about 1500 GMT under clear sky 
conditions, typically from about 14:00GMT to 16:00GMT.  This may be due to a dirty PSP but 
maintenance on 03/23/04 18:11 GMT revealed no more than typical light dust.  The problem was 
essentially undetectable by  03/31/04 12:00. The time of day that the problem exists appears 
to be an exagerated PSP cosine response.  No obvious reason presents why the problem 
appeared and then disappeared within this two week period.

• Raw data stream - documentation not supported

SGP/SIRS/E7  - Reprocessing Notice (RID 287)

See below for details of reprocessing that was completed on 20150929.  Original 
DQR category: 4 (Red, Incorrect).

-----------------------------------------------------------

During the pyrgeometer instrument (PIR) changout a datalogger program was loaded with 
incorrect calibration coefficients for the shortwave instruments.  The affected measurements 
(instruments) were : downwelling diffuse (8-48), upwelling shortwave(PSP), direct normal 
(NIP) and downwelling shortwave (PSP)

Recalculate irradiances by determining original mV signal and reapplying the correct 
calibration coefficients.  For each one minute irradiance value perform the following 
calculations by instrument:
DD(corrected) = (DD/107.24)*108.50
US(corrected) = (US/113.19)*110.10
NIP(corrected)= (NIP/120.17)*122.26
DS(corrected) = (DS/118.46)*122.56

• Raw data stream - documentation not supported

SGP/SIRS/E8  - Reprocessing Notice (RID 291)

See below for details of reprocessing that was completed on 20150929.  Original 
DQR category: 4 (Red, Incorrect).

-----------------------------------------------------------

During the pyrgeometer instrument (PIR) changeout a datalogger program was loaded with 
incorrect calibration coefficients for the shortwave instruments.  The affected measurements 
(instruments) were: downwelling diffuse (8-48), upwelling shortwave (PSP), direct normal 
(NIP) and downwelling shortwave (PSP)

Recalculate irradiances by determining original mV signal and reapplying the correct 
calibration coefficients.  For each one minute irradiance value perform the following 
calculations by instrument:
DD(corrected) = (DD/107.24)*116.37
US(corrected) = (US/113.19)*121.78
NIP(corrected)= (NIP/120.17)*122.47
DS(corrected) = (DS/118.46)*122.34

• Raw data stream - documentation not supported

SGP/SIRS/E6 - Questionable data due to Ice Storm damage

Several SIRS readings at E6 readings have appeared questionable since the ice storm in 
early January.  Starting on 01/13 maintenance found the E6 tracker inoperative. It was reset 
and put back into serivice.  Shortly after, on 01/16 data from the DSH instrument (PSP) 
became questionable possibly due to obstructed or failed ventilator fan.  On 02/10 1645 
GMT maintenance found the DSH instrument ventilator fan failed - the fan was replaced,  
the E6 tracker was also realigned.  Due to early january ice storms, the tracker alignment 
issues and a failed ventilator fan - All tracker mounted and global DS instrument 
measurements are suspect for this time frame.

• Raw data stream - documentation not supported

SGP/SIRS/E7 - Downwelling Shortwave incorrect

Downwelling shortwave values dropped off to unrealistic values frequently 
at this site (usually between 1600 GMT and 0000 GMT).  SGP techs found this was due to a 
bad multiplexer and it was replaced 04/05/2005 1950GMT along with the downwelling 
shortwave cable.

• Raw data stream - documentation not supported

SGP/SIRS/E7 - Downwelling longwave incorrect

During maintenance to correct a problem with the downwelling shortwave data, the 
downwelling longwave instrument wiring was not properly fastened resulting in incorrect 
downwelling longwave hemispheric data.

• Raw data stream - documentation not supported

SGP/SIRS/E8 - Downwelling Shortwave hemispheric (PSP) Dome Contamination

The downelling shortwave hemispheric instrument (Eppley PSP) dome at this site had dirt or 
a smudge on it.  This was most noticeable during mid to late afternoon hours (around 
2100 GMT).  PM cleaned the dome on 8/9/05 1940, correcting the problem.

• Raw data stream - documentation not supported

SGP/SIRS/E7 - SIRS Power supply problems

Power supply problems to SIRS datalogger resulted in logger voltage dropping below minimum 
for operation.  During these time ranges the datalogger was either not operating or 
operating intermittantly as battery voltage would go above and below logger voltage threshold 
of approx 9VDC.

• Raw data stream - documentation not supported

SGP/SIRS/C1/E1/E10/E11/E12/E13/E15/E16/E18/E19/E2/E20/E21/E22/E24/E25/E27/E3/E4/E5/E6/E7/E8/E9 - Ice

Ice storms affected the SGP central and extended facilities starting Dec 10 0000GMT to 
mid/late December. Each facility was affected at various times and degrees dependant on 
elevation, latitude and whether power failed for short or extended periods of time.  By 
December 15th most ice had melted from the radiometers at all the faclities but power outages 
and tracker failures persisted at some stations.

• Raw data stream - documentation not supported

• Raw data stream - documentation not supported

• Raw data stream - documentation not supported

SGP/SIRS/E8 - Ventilator Fan Failure

At the start time specified the PSP (down_short_hemisp) ventilator fan failed. PM replaced 
the fan 7/8/2008 1750.  Ventilator failure does adversely affect radiometer measurements 
but the extent has not been quantified.  Mentor suggests using component sum method 
detailed in SIRS instrument handbook where down_short_hemisp = down_short_diffuse + 
short_direct_normal * cos (zenith angle) for each time record.

• Raw data stream - documentation not supported