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_hemisp_broadband
• MFRSR_flag
• MFRSR_diffuse_hemisp_broadband
• MFRSR_direct_normal_broadband

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

• MFRSR_flag
• MFRSR_diffuse_hemisp_broadband
• 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

• Temp_Air
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Humidity, relative(rh)
• Pressure, atmospheric, surface, 60-min avg(press)
• LWupTd
• LWupTc
• LWdnTd
• LWdnTc
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
• Wind speed, at 10 meters height(wind_speed)
• wind_direction
• Precipitation, total(precip)

• Pressure, atmospheric, surface, 60-min avg(press)
• Precipitation, total(precip)
• Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
• Temp_Air
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• wind_direction
• LWdnTc
• Wind speed, at 10 meters height(wind_speed)
• LWdnTd
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• LWupTd
• LWupTc
• Humidity, relative(rh)

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.

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(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)

• 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.

• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)

• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(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)
• Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)

• Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_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

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)