DQR ID | Subject | Data Streams Affected |
---|
D030527.2 | SGP/SIRS/E27 - Instrument problem, Shadowband Misalignment | sgpsirsE27.00, sgpsirsE27.b1, sgpsirs20sE27.a0 |
D030529.3 | SGP/SIRS/E21 - Shadowband Misalignment/Tracker Failure | sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0 |
D030612.1 | SGP/SIRS/E21 - Shadowband Misalignment/Tracker Failure | sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0 |
D030701.1 | SGP/SIRS/E10 - Noisy US(upwelling shortwave) data stream problem | sgpsirsE10.00, sgpsirsE10.b1, sgpsirs20sE10.a0 |
D030715.1 | SGP/SIRS/E3 - Degraded upwelling longwave data | sgpsirsE3.00, sgpsirsE3.b1, sgpsirs20sE3.a0 |
D030715.2 | SGP/SIRS/E5 - Downwelling direct normal (NIP) reporting low | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0 |
D030722.2 | SGP/SIRS/E21 - Shadowband Misalignment | sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0 |
D030901.1 | SGP/SIRS/E19 - Shadowband Misalignment | sgpsirsE19.00, sgpsirsE19.b1, sgpsirs20sE19.a0 |
D030922.4 | SGP/SIRS/E27 - Tracker Misalignment | sgpsirsE27.00, sgpsirsE27.b1, sgpsirs20sE27.a0 |
D030922.5 | SGP/SIRS/E2 - Ventilator Fan Failure | sgpsirsE2.00, sgpsirsE2.b1, sgpsirs20sE2.a0 |
D031009.2 | SGP/SIRS/E21 - Reprocess: Incorrect PIR/UIR Calibration Coefficient | sgpsirsE21.00, sgpsirsE21.b1 |
D031020.1 | SGP/SIRS/E1 - failed SIRS multiplexer | sgpsirsE1.00, sgpsirsE1.b1, sgpsirs20sE1.a0 |
D031020.2 | SGP/SIRS/E9 - Possible instrument drift | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
D031020.3 | SGP/SIRS/E18 - Instrument noise problem | sgpsirsE18.00, sgpsirsE18.b1, sgpsirs20sE18.a0 |
D031020.4 | SGP/SIRS/E21 - Bird Poop Contamination | sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0 |
D031027.1 | SGP/SIRS/E10 - Noisy UIR (upwelling longwave)data stream problem | sgpsirsE10.00, sgpsirsE10.b1, sgpsirs20sE10.a0 |
D040126.3 | SGP/SIRS/E21 - False signal | sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0 |
D040525.12 | SGP/SIRS/E19 - Metadata errors | sgpsirsE19.b1 |
D040712.3 | SGP/SIRS/E24 - NIP shaded near sunrise | sgpsirsE24.b1, sgpsirs20sE24.a0 |
D060630.20 | SGP/SIRS/E12 - Reprocessed: Longwave Calibration error | sgpsirsE12.b1 |
D060630.22 | SGP/SIRS/E15 - Reprocessed: Longwave Calibration error | sgpsirsE15.b1 |
D060630.23 | SGP/SIRS/E16 - Reprocessed: Longwave Calibration error | sgpsirsE16.b1 |
D060630.24 | SGP/SIRS/E18 - Reprocessed: Longwave Calibration error | sgpsirsE18.b1 |
D060630.25 | SGP/SIRS/E19 - Reprocessed: Longwave Calibration error | sgpsirsE19.b1 |
D060630.26 | SGP/SIRS/E20 - Reprocessed: Longwave Calibration error | sgpsirsE20.b1 |
D060630.27 | SGP/SIRS/E21 - Reprocessed: Longwave Calibration error | sgpsirsE21.b1 |
D060630.28 | SGP/SIRS/E22 - Reprocessed: Longwave Calibration error | sgpsirsE22.b1 |
D060630.29 | SGP/SIRS/E24 - Reprocessed: Longwave Calibration error | sgpsirsE24.b1 |
D060630.30 | SGP/SIRS/E27 - Reprocessed: Longwave Calibration error | sgpsirsE27.b1 |
Subject: | SGP/SIRS/E27 - Instrument problem, Shadowband Misalignment |
DataStreams: | sgpsirsE27.00, sgpsirsE27.b1, sgpsirs20sE27.a0
|
Description: | Downwelling and Upwelling longwave values are somewhat noisy due to noisy PIR (pygeometer)
case and dome thermistor measurements on both the upwelling and downwelling PIRs. This
problem dates back to the beginning of the SIRS E27 data stream. |
Measurements: | sgpsirsE27.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
sgpsirsE27.b1: - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Maxima(up_long_hemisp_max) - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer(up_long_hemisp)
- Instantaneous Upwelling Pyrgeometer Case Thermistor Temperature, Pyrgeometer(inst_up_long_case_temp)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
Deviation(down_long_hemisp_shaded_std) - Instantaneous Upwelling Pyrgeometer Dome Thermistor Temperature, Pyrgeometer(inst_up_long_dome_temp)
- Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
Pyrgeometer(inst_down_long_shaded_case_temp) - Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Standard Deviation(up_long_hemisp_std) - Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
Pyrgeometer(inst_down_long_shaded_dome_temp) - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Minima(up_long_hemisp_min) - Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
sgpsirs20sE27.a0: - Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
Pyrgeometer(inst_down_long_shaded_dome_resist) - Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
Pyrgeometer(inst_down_long_shaded_case_resist) - Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)
- Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_dome_resist)
|
Subject: | SGP/SIRS/E21 - Shadowband Misalignment/Tracker Failure |
DataStreams: | sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0
|
Description: | The solar tracker failed beginning around sunrise on 05/19/03 most likely during the
previous nights reset. Failure time was approximate time of sunrise at 1000 on 05/19/03. The
tracker was power cycled and RTS at 1415 GMT on 05/28/03. |
Measurements: | sgpsirsE21.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
sgpsirs20sE21.a0: - Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
Pyrgeometer(inst_down_long_shaded_case_resist) - Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
Pyrgeometer(inst_down_long_shaded_dome_resist) - Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
Voltage(inst_direct_normal) - Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
Thermopile Voltage(inst_diffuse) - Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)
sgpsirsE21.b1: - Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Standard Deviation(down_short_diffuse_hemisp_std) - Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
- Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
Pyrgeometer(inst_down_long_shaded_case_temp) - Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
Pyrgeometer(inst_down_long_shaded_dome_temp) - Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
Deviation(down_long_hemisp_shaded_std) - Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Maxima(down_short_diffuse_hemisp_max) - Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Minima(down_short_diffuse_hemisp_min) - Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
|
Subject: | SGP/SIRS/E21 - Shadowband Misalignment/Tracker Failure |
DataStreams: | sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0
|
Description: | Suntracker appears to have failed beginning on 6/3/03, most likely during previous night
reset. Start time listed is approximate time of sunrise. |
Measurements: | sgpsirsE21.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
sgpsirs20sE21.a0: - Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
Pyrgeometer(inst_down_long_shaded_case_resist) - Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
Pyrgeometer(inst_down_long_shaded_dome_resist) - Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
Voltage(inst_direct_normal) - Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
Thermopile Voltage(inst_diffuse) - Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)
sgpsirsE21.b1: - Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Standard Deviation(down_short_diffuse_hemisp_std) - Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
- Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
Pyrgeometer(inst_down_long_shaded_case_temp) - Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
Pyrgeometer(inst_down_long_shaded_dome_temp) - Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
Deviation(down_long_hemisp_shaded_std) - Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Maxima(down_short_diffuse_hemisp_max) - Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Minima(down_short_diffuse_hemisp_min) - Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
|
Subject: | SGP/SIRS/E5 - Downwelling direct normal (NIP) reporting low |
DataStreams: | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0
|
Description: | There were large differences between the measured downwelling
shortwave (DS) and the downwelling shortwave calculated from direct
(NIP) and diffuse (DD) readings. It appears that the direct normal
shortwave readings were much too low, particularly on 7/14 and 7/15.
It appears that the diffuse instrument was being shaded properly, but
the NIP was not tracking the sun.
The problem was corrected during the preventative maintenance visit on
7/16/03 at 1840GMT. The technician reported doing the quarterly
connection corrosion checks and ventilator fan cleaning, the NIP was
described as having "dry-light dust" on the window, no mention of
tracker alignment was made. Although uncertain, a bad connection at
some point in the instrument wiring was likely to blame and was
eliminated during the corrosion inspection process. |
Measurements: | sgpsirsE5.b1: - Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
sgpsirs20sE5.a0: - Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
Voltage(inst_direct_normal)
sgpsirsE5.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
|
Subject: | SGP/SIRS/E21 - Shadowband Misalignment |
DataStreams: | sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0
|
Description: | Solar tracker stopped functioning on 7/17. Tracker power cycled on
07/24 and returned to normal tracking but failed again 7/25. Power
was cycled again 8/6 and tracker performance was sustained thereafter. |
Measurements: | sgpsirsE21.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
sgpsirs20sE21.a0: - Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
Voltage(inst_direct_normal) - Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
Thermopile Voltage(inst_diffuse) - Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)
sgpsirsE21.b1: - Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Standard Deviation(down_short_diffuse_hemisp_std) - Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
- Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
Deviation(down_long_hemisp_shaded_std) - Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Maxima(down_short_diffuse_hemisp_max) - Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Minima(down_short_diffuse_hemisp_min) - Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
|
Subject: | SGP/SIRS/E19 - Shadowband Misalignment |
DataStreams: | sgpsirsE19.00, sgpsirsE19.b1, sgpsirs20sE19.a0
|
Description: | The solar tracker appears to have failed on 8/28. Fuse replaced on 09/04/03 and tracker
returned to service at 15:26GMT |
Measurements: | sgpsirsE19.b1: - Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Maxima(down_short_diffuse_hemisp_max) - Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Standard Deviation(down_short_diffuse_hemisp_std) - Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
Deviation(down_long_hemisp_shaded_std) - Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Minima(down_short_diffuse_hemisp_min)
sgpsirs20sE19.a0: - Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
Voltage(inst_direct_normal) - Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)
- Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
Thermopile Voltage(inst_diffuse)
sgpsirsE19.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
|
Subject: | SGP/SIRS/E27 - Tracker Misalignment |
DataStreams: | sgpsirsE27.00, sgpsirsE27.b1, sgpsirs20sE27.a0
|
Description: | 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 and has been operating properly since. |
Measurements: | sgpsirsE27.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
sgpsirsE27.b1: - Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Minima(down_short_diffuse_hemisp_min) - Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Maxima(down_short_diffuse_hemisp_max) - Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
- Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
- Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
Standard Deviation(down_short_diffuse_hemisp_std)
sgpsirs20sE27.a0: - Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
Thermopile Voltage(inst_diffuse) - Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
Voltage(inst_direct_normal)
|
Subject: | SGP/SIRS/E2 - Ventilator Fan Failure |
DataStreams: | sgpsirsE2.00, sgpsirsE2.b1, sgpsirs20sE2.a0
|
Description: | Measured downwelling shortwave data was very questionable, reporting
nighttime values as low as -50 W/m^2, while differing from calculated
downwelling shortwave by as much as 50 W/m^2 lower during the day. The
first indication of a problem was around 10 UTC, 9/14, when measured
DS values suddenly dropped below 10 W/m^2 for about a 2 hour period
before sunrise, then were consistently lower than calculated DS by as
much as 40 W/m^2 during the day.
The problem got progressively worse with time until the ventilator fan was
replace on 9/25. Ventilator fan failure changed the fundamental
operating characteristics of this PSP and resulted in unpredictable biased
measurements which cannot be corrected without additional empirical
characterization of the radiometer in question. |
Measurements: | sgpsirsE2.b1: - Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer(down_short_hemisp)
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
Deviation(down_short_hemisp_std) - Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Minima(down_short_hemisp_min)
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Maxima(down_short_hemisp_max)
sgpsirs20sE2.a0: - Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
Voltage(inst_global)
sgpsirsE2.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
|
Subject: | SGP/SIRS/E21 - Reprocess: Incorrect PIR/UIR Calibration Coefficient |
DataStreams: | sgpsirsE21.00, sgpsirsE21.b1
|
Description: | 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 |
Measurements: | sgpsirsE21.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
sgpsirsE21.b1: - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer(up_long_hemisp)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Minima(up_long_hemisp_min) - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Maxima(up_long_hemisp_max) - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Standard Deviation(up_long_hemisp_std) - Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
|
Subject: | SGP/SIRS/E1 - failed SIRS multiplexer |
DataStreams: | sgpsirsE1.00, sgpsirsE1.b1, sgpsirs20sE1.a0
|
Description: | Beginning 10/14, a failed multiplexer resulted in missing
downwelling shortwave data and downwelling and upwelling
longwave data which were much too low. The multiplexer
handles data for the longwave instruments (UIR and DIR)
case and dome temperatures as well as the downwelling shortwave
hemispheric instrument (DS). |
Measurements: | sgpsirs20sE1.a0: - Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
Pyrgeometer(inst_down_long_shaded_dome_resist) - Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
Pyrgeometer(inst_down_long_shaded_case_resist) - Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
Voltage(inst_global) - Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_dome_resist)
- Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)
sgpsirsE1.b1: - Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
- Instantaneous Upwelling Pyrgeometer Case Thermistor Temperature, Pyrgeometer(inst_up_long_case_temp)
- Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
Pyrgeometer(inst_down_long_shaded_case_temp) - Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Maxima(down_short_hemisp_max)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Minima(up_long_hemisp_min) - Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
Pyrgeometer(inst_down_long_shaded_dome_temp) - Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
Deviation(down_short_hemisp_std) - Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Minima(down_short_hemisp_min)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer(up_long_hemisp)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
- Instantaneous Upwelling Pyrgeometer Dome Thermistor Temperature, Pyrgeometer(inst_up_long_dome_temp)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Maxima(up_long_hemisp_max) - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Standard Deviation(up_long_hemisp_std) - Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer(down_short_hemisp)
- Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
Deviation(down_long_hemisp_shaded_std)
sgpsirsE1.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
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Subject: | SGP/SIRS/E18 - Instrument noise problem |
DataStreams: | sgpsirsE18.00, sgpsirsE18.b1, sgpsirs20sE18.a0
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Description: | Upwelling longwave data was somewhat noisy during this period. There
was a direct relation to the case and dome thermistor measurements for
the upwelling longwave PIR (UIR). Data quality does not appear to be
greatly affected overall, though instantaneous values had greater
than usual variability. The noise disappeared on 10/19. |
Measurements: | sgpsirs20sE18.a0: - Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)
- Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_dome_resist)
sgpsirsE18.b1: - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Minima(up_long_hemisp_min) - Instantaneous Upwelling Pyrgeometer Case Thermistor Temperature, Pyrgeometer(inst_up_long_case_temp)
- Instantaneous Upwelling Pyrgeometer Dome Thermistor Temperature, Pyrgeometer(inst_up_long_dome_temp)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Standard Deviation(up_long_hemisp_std) - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer(up_long_hemisp)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Maxima(up_long_hemisp_max)
sgpsirsE18.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
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Subject: | SGP/SIRS/E10 - Noisy UIR (upwelling longwave)data stream problem |
DataStreams: | sgpsirsE10.00, sgpsirsE10.b1, sgpsirs20sE10.a0
|
Description: | Beginning 6/29, upwelling longwave (UIR) values frequently
exceeded quality control boundaries and appeared excessively
noisy. Instrument wiring was suspected. Data remained noisy
until 08/06/2003 0500GMT when the UIR data returned to normal. |
Measurements: | sgpsirsE10.b1: - Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
- Instantaneous Upwelling Pyrgeometer Dome Thermistor Temperature, Pyrgeometer(inst_up_long_dome_temp)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Maxima(up_long_hemisp_max) - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer(up_long_hemisp)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Standard Deviation(up_long_hemisp_std) - Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
Minima(up_long_hemisp_min) - Instantaneous Upwelling Pyrgeometer Case Thermistor Temperature, Pyrgeometer(inst_up_long_case_temp)
sgpsirs20sE10.a0: - Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_dome_resist)
- Instantaneous Upwelling Pyrgeometer Thermopile Voltage, Pyrgeometer(inst_up_long_hemisp_tp)
- Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)
sgpsirsE10.00: - Raw data stream - documentation not supported(Raw data stream - documentation not supported)
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