SGP/QCRAD/E1 - Intermittently missing MFRSR data

Chunks of MFRSR data are missing during 20050514 - 20050712.  After maintenance was 
performed on 20050712 the 415, 500 and 940 nm channels are available, and while they look OK, 
they should be used with caution.

MFRSR data may be missing or zero; some tests on best estimate global shortwave cannot be 
applied.  BEGSW could be incorrect if MFRSR data used in tests or fits.

See instrument DQR D050521.1

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• MFRSR_diffuse_hemisp_broadband
• MFRSR_flag
• MFRSR_hemisp_broadband
• MFRSR_direct_normal_broadband

SGP/QCRAD/E1 - MFRSR shadowband misalignment

MFRSR not shaded properly during periods covered by this DQR.  Do not use direct or 
diffuse data from within the affected ranges.

Some time periods described in instrument DQRs D060719.2 & D090508.3

• MFRSR_diffuse_hemisp_broadband
• MFRSR_flag
• MFRSR_direct_normal_broadband

SGP/QCRAD/E1 - Missing surface met data

Surface meteorological data were missing during these time periods. Met data is used in a 
variety of quality control checks described below.

Air temperature data is needed for tests on LW up and LW down pyrgeometer case and dome 
temperatures, and tests on the irradiances from upwelling LW/SW and downwelling LW.

The Rayleigh limit diffuse radiation test is based on surface pressure.

Most periods with missing data described in instrument DQRs: D991109.1, D080617.4, 
D080617.5

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• Temp_Air
• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)
• Humidity, relative, on hybrid-b grid, derived from RUC model(rh)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Pressure reduced to mean sea level(press)
• LWupTd
• Wind speed, at 10 meters height(wind_speed)
• LWupTc
• LWdnTd
• Wind direction(wind_direction)
• LWdnTc
• Precipitation, total, derived from ETA model(precip)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E1 - Intermittently missing downwelling diffuse

Starting on or about 10/26/2005 the downwelling diffuse hemispheric irradiance (Eppley 
8-48) instrument had intermittent missing values. Technicians found a loose wire on the 
instrument connector and repaired it on 4/4/2006. 

This means that Best Estimate Global can't be calculated from the sum of direct and 
diffuse. It also means that some quality checks can't be done.

Problem documented in instrument DQR D060331.2.

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E1 - Intermittently missing downwelling diffuse

Starting on or about 10/26/2005 the downwelling diffuse hemispheric irradiance (Eppley 
8-48) instrument had intermittent missing values. Technicians found a loose wire on the 
instrument connector and repaired it on 4/4/2006. 

This means that Best Estimate Global can't be calculated from the sum of direct and 
diffuse. It also means that some quality checks can't be done.

Problem documented in instrument DQR D060331.2.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E1 - Bad SWup data

SWup data appears to be too high over these periods. QC checks screen out some parts of 
the day, but remaining data that is available also appears to be much too high.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E1 - Tracker malfunction

The solar tracker was inoperative during these time periods indicating that the shortwave 
direct normal, the shortwave diffuse, and possibly the downwelling longwave irradiance 
are inaccurate.

This also impacts the best estimate value because the sum of direct and diffuse cannot be 
used, and some tests can't be applied to the data.

Some problems documented in instrument DQRs:  D090520.1 & D090121.1

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)

SGP/QCRAD/E1 - Tracker malfunction

The solar tracker was inoperative during these time periods indicating that the shortwave 
direct normal, the shortwave diffuse, and possibly the downwelling longwave irradiance 
are inaccurate.

This also impacts the best estimate value because the sum of direct and diffuse cannot be 
used, and some tests can't be applied to the data.

Some problems documented in instrument DQRs:  D090520.1 & D090121.1

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E4 - UPS failure

On Jan 13th approximately 1400GMT the UPS failed at E4. This affected both the global and
tracker mounted instruments. The affected measurements are down_short_hemisp(PSP),
down_short_diffuse(8-48) and direct_normal(NIP) measurements.  The PSP down_short_hemisp
measurement doesn't rely on the tracker but is power ventilated and is adversely affected 
by
daytime solar heating when the ventilator power fails.

Documented in instrument DQR D080212.3

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E4 - Tracker failure

On 4/2, the station experienced a power drop after which the tracker was not operational 
until it was reset on 5/1.

The short_direct_normal (NIP instrument) and down_short_diffuse_hemispheric (8-48 
instrument) data were bad during this time.  The down_long_hemispheric (PIR) and 
down_short_hemispheric were unaffected by this failure.  Upwelling instruments were also unaffected.  
Three component DQ checks were not valid during this time.

Documented in instrument DQR D080422.2

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E4 - Tracker inoperative

reloaded program 6/25 1607 GMT.

The short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data are bad during 
this
time and are not recoverable.

documented in instrument DQR D080617.3

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E4 - Tracker inoperative

Tracker failed on 04/02 until reset by Ops on 5/13.  This adversely affected
down_short_diffuse_hemisp and short_direct_normal data.  Data are not recoverable.

documented in instrument DQR D090424.2

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E7 - Tracker not aligned

Tracker appears to be out of alignment or inoperative during these times. The 
short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data apear to be bad and not 
recoverable.

There were no instrument DQRs on this problem at the time this report was submitted.

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E9 - Tracker not working

Tracker appears to be out of alignment or inoperative during these times. The 
short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data apear to be bad and not 
recoverable.

Documented in instrument DQRs: D060718.2 & D070312.1

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E10 - Tracker failure

During the night of 11/05-06 2004 the tracker failed at this location. During CM on 12/01, 
power cycling returned the tracker to service. However, tracker was not properly 
tracking in the AM. Tracker failed again sometime near 01/01/2005.	CM reloaded the tracker 
program and realigned the tracker on 01/26/2005 1600GMT correcting the problem.

Documented in instrument DQR: D041206.1

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E15 - Tracker alignment

Tracker appears to be out of alignment or inoperative during these times. The 
short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data apear to be bad and not 
recoverable.

There were no instrument DQRs on this problem at the time this report was submitted.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E16 - Tracker alignment issue

Tracker appears to be out of alignment or inoperative during these times. The 
short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data appear to be bad and not 
recoverable.

There were no instrument DQRs on this problem at the time this report was submitted.

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E20 - Failed tracker/improperly configured tracker

On 1/15/2007 the E20 tracker failed due to weather.  On 3/14 it was replaced but 
configured incorrectly (presumably the wrong lat/long).  This wasn't discovered and corrected 
until 6/6/2007 1745GMT.

All shortwave instruments dependent on proper tracker were affected.  This includes 
measurements: downwelling shortwave diffuse and direct normal. Additionally, the global 
shortwave instrument have also been shaded during the second time range due to improperly set 
tracker.

Discussed in instrument DQR D070927.1

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E20 - Tracker alignment issue

Tracker appears to be out of alignment or inoperative during these times. The 
short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data appear to be bad and not 
recoverable.

There were no instrument DQRs on this problem at the time this report was submitted.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E21 - Tracker out of alignment

Tracker appears to be out of alignment or inoperative during these times. The 
short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data appear to be bad and not 
recoverable.

Some of these dates are documented in instrument DQRs:

D030529.3, D030612.1, D030722.2, D040229.2, D080602.2, D080722.1

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E22 - Tracker not working

Tracker appears to be out of alignment or inoperative during these times. The 
short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data apear to be bad and not 
recoverable.

There were no instrument DQRs on this problem at the time this report was submitted.

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E22 - Tracker failure

During the time ranges specified the SIRS solar tracker had failed for unspecified 
reasons. 
Measurements of short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) are 
incorrect
and not recoverable. Longwave data are unaffected.

Documented in instrument DQRs:  D071217.3 & D080602.1

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E24 - Tracker appears to be off

Tracker appears to be out of alignment or inoperative during these times. The 
short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data appear to be bad and not 
recoverable.

There were no instrument DQRs on this problem at the time this report was submitted.

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E27 - Tracker failed

Suntracker failed at this facility. The suntracker was reset on	9/17, but this only 
temporarily fixed the problem and the tracker began failing again 9/18.  Tracker was reset and 
realigned on 10/15/03 17:30GMT.

Documented in instrument DQR D030922.4

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E27 - Tracker failure

Possible main power problem made may have caused the tracker to fail.  Attempts to restart 
the old tracker, subsequent replacement and lack of spares contributed to incorrect data 
from the NIP (short_direct_normal datastream) and 8-48 (down_short_diffuse_hemisp 
datastream) until the time of site decommissioning.  

This facility was decommissioned and maintenance efforts ceased 10/1/2009. The instrument 
was removed from service 12/04/2009.

Documented in instrument DQR D090609.1

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E6 - Upwelling Shortwave flux zero

Upwelling shortwave flux values are zero during this time. The reason for this is not 
known. 

There was no instrument DQR describing this problem at the time this DQR was submitted.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E2 - Tracker inoperative

Solar tracker inoperative. Described in instrument DQR D970310.1.

From about 97/02/20 to 97/03/06 (1500 GMT) the solar tracker was inoperative
at site E2.  We cannot pin down the exact starting time of this failure
because of cloudy conditions around 97/02/20.  The failure becomes obvious
during clear skis at which time the NIP reads zero (i.e., it isn't pointed
at the sun) and the downward diffuse radiation is too large (because the
diffuse pyranometer is not being shaded).  97/03/03 was a particularly 
clear day and the diffuse pyranometer reads almost the same as the total
downward pyranometer.  The fact that they don't read exactly the same - the
discrepency is about 75 W/m^2 at solar noon - is indicative of a large sensor
calibration problem.  This large calibration error is NOT typical of ARM 
data, rather it is peculiar to this site.

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E2 - Possible calibration error

Either the downwelling shortwave or the shortwave diffuse radiometer appears to have a 
large calibration error. This also impacts the best estimate data. It is not clear when this 
problem started or was fixed, so the dates in this DQR may not fully describe the problem.

Described in instrument DQR D970310.1.

97/03/03 was a particularly  clear day and the diffuse pyranometer reads almost the same 
as the total downward pyranometer.  The fact that they don't read exactly the same - the 
discrepency is about 75 W/m^2 at solar noon - is indicative of a large sensor calibration 
problem.  This large calibration error is NOT typical of ARM data, rather it is peculiar 
to this site.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E7 - Questionable shortwave radiometer data

Diffuse, direct normal flux appear questionable, possibly also total downwelling shortwave 
flux. The source of this problem is not known. No instrument DQRs exist for this problem.

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E7 - Problems with downwelling shortwave flux

The downwelling shortwave values were dropping out. These got transferred to the best 
estimate total flux data. 

PSP data (down_short_hemisp) is not recoverable but can be calculated using:
global = direct*cos(zenith angle) + diffuse 

See the SIRS instrument handbook for details of this component sum method.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E10 - Reprocess: Wrong calibration factor applied to NIP

From about 950721 to about 970204 (19:12 GMT) the wrong calibration
factor was applied to the NIP at site E10.  The calibration factor
that was used was 1.00E-06 Volts/(W m^2).  The correct calibration
factor is 8.338E-06 Volts/(W m^2).  Thus the calibrated NIP values
found in the netCDF files are too large by a factor of 8.338.

Documented in instrument DQR D970213.1

• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E12 - downwelling pyranometer data incorrect

Because of a bad "preamp cable", the data from the downwelling pyranometer
at site E12 would generally not fall below 400 W/m^2 even at night.  We don't
know exactly when this problem begins, so beware of all downwelling
pyranometer data taken before 960422.

This will also impact the best estimate GSW data when it uses the GSW pyranometer data.

Described in instrument DQR D960501.1

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E8 - Upwelling shortwave data bad

Upwelling shortwave flux values are incorrect for this period, showing a constant value. 
The reason for this is not known.

No instrument DQRs describing this problem existed at the time this DQR was submitted.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E12 - Upwelling shortwave flux bad

Upwelling shortwave flux appears to be missing or bad during these periods. The reason for 
this is not known. No instrument DQRs available to explain this problem at this time.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E15 - Upwelling shortwave flux appears bad

Upwelling shortwave flux appears to be bad during these periods. Flux shows extended 
periods with zero values. The reason for this is not known.

No instrument DQRs available describing this problem.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E16 - Upwelling shortwave flux bad

Upwelling shortwave flux appears to be bad during this time. The cause is not known. No 
instrument DQR exists explaining the problem.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E18 - Upwelling shortwave flux bad

Upwelling shortwave flux appears to be bad during this period. The reason is not known. 
There are no instrument DQRs describing this problem.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E20 - Upwelling shortwave flux bad

Upwelling shortwave flux appears bad during this time, values are near zero.  No 
instrument DQRs documenting this problem were available at the time this DQR was submitted.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E24 - Upwelling shortwave flux questionable

Upwelling shortwave flux appears to be questionable during this period. Data is noisy or 
too low. Use the data with caution. No instrument DQRs exist describing this problem.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E18 - NIP condensation problem

NIP at E18 was measuring impossible values due to condensation on inside of NIP window.  
PM
replaced NIP 2/26/2008 2150.

Documented in instrument DQR D080212.4

• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E19 - Ventilator failure

Dowenlling shortwave hemispheric instrument signal (Eppley PSP) is very erratic due to 
failed
ventilator fan which was replaced during PM on 04/13/2006.

Discussed in instrument DQR D060403.3.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E20 - Downwelling shortwave PSP damaged by lightning

The PSP was damaged by a lightning strike on 8/04/05 (22:10 GMT).  Data from other 
radiometers are good after this event.  The PSP, NIP and shaded 8-48 were replaced 8/17/05 and 
the system returned to service at 18:40 GMT.

Described in instrument DQR D050810.3.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E21 - Reprocess: Incorrect PIR/UIR Calibration Coefficient

Problem documented in instrument DQR D031009.2:

Incorrect coefficients were applied to the upwelling longwave radiation
measurement instrument (i.e. pyrgeometer, SIRS acroynm "UIR") during
this time period.

For a PIR mounted in an upwelling measurement orientation (UIR), the
thermopile output is extremely low compared to a downwelling PIR (DIR).
In addition, the UIR case and dome temperature differences are much
smaller than a DIR.  This results in the pyrgeometer receiver radiation 
term, Wr (NREL/Hickey equation) or Wc (Albrecht/Cox equation), dominating
all other terms of the infrared radiant flux equation.

Since the receiver radiation term uses coefficients in both forms of
the pyrgeometer equations nearly equal to 1.0 +- <1% the result is a
measurement of incoming longwave radiant flux relatively insensitive 
to the installed instrument - so long as it is an Eppley PIR.
		
Evaluation of the problem data shows the expected error of the data
(before correction) will be within 1% - less than the uncertainty of 
the instrument (Eppley PIR greater of 5% or 5 W/m2)
		
To correct the one minute data found in the a1 or b1 datastream follow
this procedure:
1) Obtain the following variables from the b1 datafile:
	 inst_up_long_dome_temp
	 inst_up_long_case_temp
	 up_long_netir

2) For each one minute data entry in b1
     tpUIR[uV] = up_long_netir[uV]/0.2523876[W/m2/uV]

3) Apply for each one minute data entry:

WinUIR(W/m2)=k*V+ Sigma*Tc^4 -4*Sigma*(Td^4 - Tc^4)
	    =[0.28902*tpUIR]+[Sigma*inst_up_long_case_temp^4]
	      -[4*Sigma*(inst_up_long_dome_temp^4-inst_up_long_case^4)]

where, Sigma =	5.6697E-8 (Stefan-Boltzman Const)
		
Other datastream corrections that use the UIR measurements will require
similar corrections.


See the following web site for additional information on the pyrgeometer
equations, specifically sections 2.1(Single Calibration Factor Approach)
and 2.2 (Four Coefficient Calibration Approach)

      http://www.arm.gov/docs/instruments/static/pyrg.html

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E21 - Bird poop contamination

Downwelling shortwave values were erratic during the day on 10/18 and in very poor 
agreement at times with downwelling shortwave values calculated from direct and diffuse 
measurements. Bi-weekly preventative maintenance records indicate bird poop was cleaned from the 
downwelling shortwave instrument on 10/29 at 16:30.  Review of maintenance records and 
instrument data indicate no bird contamination since 10/29.

Turkey vultures are the usual suspects in data quality problems at this facility. The RBD 
(rotating bird deterrent) had failed the week of 10/13 and was awaiting parts.  However, 
beginning in late October the birds had left the site.

Documented in instrument DQR D031020.4.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E11 - Upwelling LW flux incorrect

Longwave upwelling flux values appear incorrect during this time. The cause is not known. 
Currently there are no instrument DQRs describing this problem.

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E15 - Direct normal irradiance intermittently low

Direct normal irradiance measurements appear to be intermittently too low and possibly 
incorrect during this time period. The cause is not known. No instrument DQRs currently 
exist describing the problem.

• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E18 - Global SW data incorrect

Global shortwave and best estimate SW data appear incorrect during this time. The cause is 
not known.  No instrument DQRs are currently available describing the problem.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E20 - Noisy LW upwelling flux, case and dome temperatures

Longwave upwelling flux and Tc/Td very noisy during these times. No instrument DQR at this 
time.

Use caution with data, not all of it has been screened out by the QCRad quality checks.

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTd
• LWupTc

SGP/QCRAD/E25 - Missing Best estimate and global values

Many best estimate and GSW values are missing during this time period. Some of this data 
could be filled with MFRSR measurements.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E25 - NIP data questionable

Direct normal irradiance values are strange during this period. No instrument DQR 
currently exists documenting the problem and its cause is not known.

• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E27 - Reprocess: Incorrect calibration coefficients

Logger reverted to previous years configuration, possibly due to power outage and 
non-current logger program in storage module.  Note, the tracker had failed during this period as 
well.

The configurations are as follows:
Correct S/N and coefficients for this station during this time
Diffuse PSP:   33268F3
PSP-US:        30811F3
NIP:	       29578E6
PSP-DS:        30903F3
Diffuse PSP: 118.49 W/(m^2*mV)
PSP-US:      116.66 W/(m^2*mV)
NIP:	     123.30 W/(m^2*mV)
PSP-DS:      128.92 W/(m^2*mV)

Incorrect S/N and coefficients applied during this time range.
Diffuse PSP:   33366F3
PSP-US:        30961F3
NIP:	       29009E6
PSP-DS:        20386F3
Diffuse PSP: 111.68 W/(m^2*mV)
PSP-US:      111.85 W/(m^2*mV)
NIP:	     111.03 W/(m^2*mV)
PSP-DS:      104.15 W/(m^2*mV)

Data must be reprocessed for all shortwave instruments; longwave instruments are 
unaffected. The following corrections must be applied:

down_short_diffuse_hemisp(new) = down_short_diffuse_hemisp(old) * 118.49/111.68
up_short_hemisp(new) = up_short_hemisp(old) * 116.66/111.85
short_direct_normal(new) = short_direct_normal(old) * 123.30 / 111.03
down_short_hemisp(new) = down_short_hemisp(old) * 128.92 / 104.15

Reference instrument DQR D090521.1

• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/C1 - Reprocess: SW data require -1 multipler

Magnitude of data are correct, however, 2 wires were crossed producing negative values for 
SW Global Down, SW Global Up, SW Direct Normal, and SW Diffuse Down. Problem has been 
fixed at site.

Users of this data should multiply by -1 to get the correct values for SW Global Down, SW 
Global Up, SW Direct Normal, and SW Diffuse Down. Data will be reprocessed.

Documented in instrument DQR D000919.1.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)
• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/C1 - Upwelling SW cable problem

Starting 11/13/2006, the C1 SIRS Upwelling Shortwave (up_short_hemisp) started to show 
large differences in comparison to co-located E13 SIRS and C1 IRT25m.  After much 
troubleshooting and gnashing of teeth it was discovered that rodents had chewed through the 
instrument cables at the bottom of the tilt tower. Cables were replaced 01/23/2007 1930GMT.

Documented in instrument DQR D061121.2

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/C1 - Sensor cable problem

Beginning October 3, 2007, the upwelling longwave irradiance (up_long_hemisp, aka "UIR") 
started to spike to unreasonable values positively offset from the co-located E13 by over 
100W/m2.  On January 17 2008 the UIR values become consistently bad due to bad UIR dome 
thermistor wiring.  Problem appears as a resistive offset in the dome thermistor but due 
to nature of failure (unknown cable problem) data correction would not yield any better 
data than the co-located E13 UIR instrument that is known to be operating correctly. 
Instrument cable replacement on 4/22 fixed the problem.

Thermopile data (netIR) from this instrument is good.  However, incoming irradiance data 
is not correctable due to bad UIR dome thermistor wiring within the instrument cable. 

Documented in instrument DQR D071022.4.

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/C1 - SW direct normal data drop out

NIP cable had failed during this time period.  Short_direct_normal data are not 
recoverable during this time period. However, it can be reconstructed using the following formula 
for each one minute data:
   short_direct_normal = (down_short_hemisp-down_short_diffuse_hemisp)/cos(zenith angle)

Documented in instrument DQR D090623.1

• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/C1 - Failed upwelling SW cable

The upwelling shortwave hemispheric (up_short_hemisp) data were missing or incorrect due 
to a bad cable.  Cable was replaced on 6/30 and the problem was resolved.

Documented in instrument DQR D100701.1

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/C1 - NIP failure

The short_direct_normal (NIP instrument) cable failed during this time period.	Data are 
not recoverable.

Users can derive an estimate of direct normal values using the following formula:
short_direct_normal = (down_short_hemisp - down_short_diffuse_hemisp)/cos(zenith angle)

Documented in instrument DQR D110628.2

• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E9 - Direct normal incorrect

Direct normal irradiance measurements appear to be incorrect. The cause of the problem is 
not known. No instrument DQR is available describing the problem at this time.

Direct normal irradiance should not be used. It can be calculated from diffuse and global 
measurements or the MFRSR data can be substituted.

• Shortwave Direct Normal Irradiance(short_direct_normal)

SGP/QCRAD/E22 - Upwelling shortwave flux questionable

Upwelling shortwave flux is noisy during this period and should be used with caution. The
reason for this is not known. There are currently no instrument DQRs describing this 
problem.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E4 - Shortwave fluxes incorrect

Shortwave fluxes - direct normal, diffuse, global downwelling, best estimate global, 
upwelling shortwave - have constant values during this time.

The cause of this problem is not known. No instrument DQRs exist for this period.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)

SGP/QCRAD/E7 - Shortwave fluxes appear to be too low

All shortwave fluxes--best estimate global, global downwelling, diffuse, direct normal, 
and upwelling shortwave--are too low during this period.

The cause of this problem is not known. There are no instrument DQRs on this problem.

• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)
• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E11 - Shortwave fluxes too low

Shortwave fluxes are too low during this time (including best estimate, global, direct 
normal, diffuse, upwelling shortwave).

The cause of this problem is not known. No instrument DQRs available describing this 
problem.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E20 - Shortwave fluxes too low

Shortwave fluxes too low during this time (including best estimate, global, diffuse, 
direct normal, upwelling shortwave). 

LW upwelling and downwelling case and dome temperatures also noisy during this time.

The cause for this problem is not known. No instrument DQRs currently exist describing 
this problem.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
• Shortwave Direct Normal Irradiance(short_direct_normal)
• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E10 - Noisy upwelling longwave

Upwelling Infrared irradiance signals noisy resulting from problems with pyrgeometer 
signal cable connections.

Documented in instrument DQRs D030110.37, D030110.36, D031027.1

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E10 - Noisy upwelling shortwave flux

Beginning 6/22, upwelling shortwave values frequently dropped well below 0 W/m^2 
(occasionally dropping below -50 W/m^2) during the nighttime hours.  Daytime values were 
excessively high and noisy. Instrument wiring was suspected and was corrected 07/02/2003.

Documented in instrument DQR D030701.1

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E11 - Instrument multiplexer failure

The multiplexer failed intermittently during this time. The down_short_hemisp, 
up_long_hemisp and down_long_hemisp were very noisy. The SIRS multiplexer wiring or mux itself was 
failing during this time. Ops replaced the mux on 12/2. 

The problem is documented in instrument DQR D081029.2

• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E25  - Noisy LWup Tc/Td

Case and dome temperatures for upwelling Longwave fluxes are noisy during this period 
corresponding to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWupTc
• LWupTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E24  - Noisy Tc/Td

Case and dome temperatures for Longwave fluxes are noisy during this period corresponding 
to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWupTd
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTc
• LWdnTd
• LWdnTc

SGP/QCRAD/E2  - Tc/Td values low

Case and dome temperatures for longwave fluxes appear to be low during this period, and 
long wave fluxes also appear to be incorrect.

No instrument DQRs exist documenting this problem.

• LWdnTc
• LWdnTd
• LWupTc
• LWupTd
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E2  - Tc/Td values are zero

Case and dome temperatures for Longwave fluxes are zero during this period meaning not all 
checks can be performed on the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWdnTc
• LWdnTd
• LWupTc
• LWupTd
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E2  - Intermittent Tc/Td strange values

Case and dome temperatures for longwave fluxes appear strangely high during this period 
corresponding to possibly incorrect values in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWdnTc
• LWdnTd
• LWupTc
• LWupTd
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E3  - LW Tc/Td too low

Case and dome temperatures for Longwave fluxes appear too low during this period 
corresponding to problems in correcting/testing LW fluxes.

No instrument DQRs exist documenting this problem.

• LWupTc
• LWdnTc
• LWupTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• LWdnTd

SGP/QCRAD/E3  - LWup dome temperature missing

Upwelling longwave dome temperatures are missing during this period, meaning not all 
checks/corrections can be made to LWup flux.

No instrument DQRs exist documenting this problem.

• LWupTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E3  - LWup Tc/Td missing

Case and dome temperatures are missing for upwelling Longwave flux during this period so 
not all tests/corrections can be made to upwelling LW flux.

No instrument DQRs exist documenting this problem.

• LWupTc
• LWupTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E4  - LWup Tc/Td missing or bad

Case and dome temperatures for upwelling Longwave fluxes are missing or zero during this 
period meaning not all checks can be performed on longwave flux.

No instrument DQRs exist documenting this problem.

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTd
• LWupTc

SGP/QCRAD/E9  - Noisy longwave Tc/Td

Case and dome temperatures for longwave fluxes are noisy during this period corresponding 
to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWdnTd
• LWdnTc
• LWupTc
• LWupTd
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)

SGP/QCRAD/E13 - Multiplexer failure

The down_short_hemisp (PSP), down_long_hemisp_shaded (DIR) and up_long_hemisp (UIR)
experienced frequent dropouts due to a failing multiplexer.  CM replaced mux on 1/7. Don't 
use best estimate GSW, if "source_BestEstimate_down_short_hemisp" is -1.

Documented in instrument DQR D080104.1

• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E10  - LWup Tc/Td bad

Case and dome temperatures for upwelling longwave fluxes are bad during this period so 
some tests cannot be done on upwelling fluxes.

No instrument DQRs exist documenting this problem.

• LWupTc
• LWupTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E10  - Upwelling LW Tc/Td/flux questionable

Case and dome temperatures for upwelling longwave flux are sporadically questionable 
during this period corresponding to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWupTc
• LWupTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E13  - Noisy Tc/Td

Case and dome temperatures for Longwave fluxes are noisy during this period corresponding 
to additional noise in the longwave fluxes and upwelling shortwave flux.

No instrument DQRs exist documenting this problem.

• LWdnTd
• LWdnTc
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTc
• LWupTd

SGP/QCRAD/E12  - Tc/Td missing or noisy

Case and dome temperatures for Longwave fluxes are noisy during this period corresponding 
to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWdnTc
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• LWdnTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTc
• LWupTd

SGP/QCRAD/E15  - LWup Td noisy

Upwelling longwave dome temperature noisy during this period which may add additional 
noise in the LWup and SWup fluxes.

No instrument DQRs exist documenting this problem.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTd

SGP/QCRAD/E5  - LWup Tc/Td noisy

Case and dome temperatures for upwelling longwave fluxes are noisy during this period 
corresponding to additional noise in the upwelling longwave and possibly the shortwave fluxes.

No instrument DQRs exist documenting this problem.

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTd
• LWupTc
• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)

SGP/QCRAD/E6  - Tc/Td noisy

Case and dome temperatures for longwave fluxes are noisy during this period corresponding 
to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWupTd
• LWdnTc
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• LWdnTd
• LWupTc

SGP/QCRAD/E7  - Tc/Td bad/missing/noisy

Case and dome temperatures for longwave fluxes are missing, bad, or noisy during this 
period corresponding to additional noise in the longwave fluxes. Some checks to the longwave 
fluxes cannot be performed when Tc/Td are missing.

No instrument DQRs exist documenting this problem.

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTd
• LWupTc
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• LWdnTc
• LWdnTd

SGP/QCRAD/E16  - Tc/Td bad or noisy

Case and dome temperatures for longwave fluxes are sporadically bad or noisy during these 
periods corresponding to additional noise in the longwave fluxes. Some checks can't be 
applied to the LW fluxes.

No instrument DQRs exist documenting this problem.

• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• LWdnTc
• LWdnTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTc
• LWupTd

SGP/QCRAD/E19  - Noisy Tc/Td

Case and dome temperatures for longwave fluxes are sporadically noisy during these periods 
corresponding to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWupTc
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• LWupTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWdnTc
• LWdnTd

SGP/QCRAD/E20 - Instrument noise

Afer recovery from lightning strike the upwelling longwave SIRS Eppley PIR (UIR) had noise 
on both dome and case thermistor measurements.  On 4/12/2006 techs replaced defective 
j-panel at base of tower.

Noise didn't appear to have a bias but standard deviation went from 12-13 W/m2 during 
noisy period back to .75-1.5W/m2 after noise problem was eliminated.

Described in instrument DQR D060403.4

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E18  - LWup Tc/Td bad

Case and dome temperatures for upwelling longwave fluxes are bad during this period, so 
some checks/corrections cannot be applied to the upwelling longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWupTc
• LWupTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/E18  - LW Tc/Td noisy or bad

Case and dome temperatures for longwave fluxes are noisy or bad during this period 
corresponding to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWdnTc
• LWupTc
• LWupTd
• LWdnTd
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)

SGP/QCRAD/E25 - Upwelling longwave out of range

Upwelling longwave irradiance exceeds physical limits. Data are consistently negative and 
range from -1000 to -2000 W/m2 due to equipment problem(s).

Documented in instrument DQR D021028.1

• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)

SGP/QCRAD/C1 - Case and dome temperatures not available

Longwave downwelling and upwelling case and dome temperatures are not available during 
this time period because they were not kept in the sirs.a1 files and sirs.b1 files are not 
available. This means that some longwave tests and corrections can't be applied.

• LWupTd
• LWupTc
• LWdnTd
• LWdnTc
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)

SGP/QCRAD/E24  - Noisy Tc/Td

Case and dome temperatures for longwave fluxes are sporadically noisy during this period 
corresponding to additional noise in the longwave fluxes and perhaps in the upwelling 
shortwave flux.

No instrument DQRs exist documenting this problem.

• Upwelling shortwave hemispheric irradiance, pyranometer(up_short_hemisp)
• LWupTd
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTc
• LWdnTd
• LWdnTc

SGP/QCRAD/E24  - Intermittently noisy Tc/Td

Case and dome temperatures for Longwave fluxes are intermittently noisy during this period 
corresponding to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWupTd
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Upwelling longwave hemispheric irradiance, pyrgeometer(up_long_hemisp)
• LWupTc
• LWdnTd
• LWdnTc

SGP/QCRAD/E4 - MET data missed in these files

MET data are missing in these files

• Temp_Air
• Precipitation, total, derived from ETA model(precip)
• Wind direction(wind_direction)
• Wind speed, at 10 meters height(wind_speed)
• Pressure reduced to mean sea level(press)

SGP/QCRAD/E6 - Missing MET data in these files

MET data are missing in these files

• Wind direction(wind_direction)
• Temp_Air
• Wind speed, at 10 meters height(wind_speed)
• Humidity, relative, on hybrid-b grid, derived from RUC model(rh)
• Precipitation, total, derived from ETA model(precip)
• Pressure reduced to mean sea level(press)