SGP/QCRAD/E4 - 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.

Documented in instrument DQR D991109.3

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• Direction from which the wind blows, with respect to Geographic or Magnetic
  north(wind_direction)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• 10 meter Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
• Wind speed 5m AGL at the ground station(wind_speed)
• Upwelling LW Case Temperature(LWupTc)
• Upwelling LW Dome Temperature(LWupTd)
• Pressure reduced to mean sea level(press)
• 25 meter Upwelling Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
• Air Temperature(Temp_Air)
• Total precipitation over one minute sampling period(precip)
• Downwelling LW Case Temperature(LWdnTc)
• Downwelling LW Dome Temperature(LWdnTd)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• Relative Humidity (hybrid-b grid)(rh)

• 25 meter Upwelling Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
• Downwelling longwave hemispheric irradiance, pyrgeometer(down_long_hemisp)
• 10 meter Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
• Direction from which the wind blows, with respect to Geographic or Magnetic
  north(wind_direction)
• Upwelling LW Case Temperature(LWupTc)
• Pressure reduced to mean sea level(press)
• Upwelling LW Dome Temperature(LWupTd)
• Relative Humidity (hybrid-b grid)(rh)
• Total precipitation over one minute sampling period(precip)
• Wind speed 5m AGL at the ground station(wind_speed)
• Air Temperature(Temp_Air)
• Downwelling LW Dome Temperature(LWdnTd)
• Downwelling LW Case Temperature(LWdnTc)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)