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VAP : Correction of Diffuse Shortwave Measurements (DIFFCOR)

Instrument Categories
Derived Quantities and Models

The DIFFCORR1DUTT VAP uses two techniques to correct shortwave (SW) data during daytime hours, using information from a collocated pyrgeometer. First, the detector-only correction technique uses data in the form of irradiance loss from the pyrgeometer detector. Second, the full-correction technique uses information from collocated pyrgeometer detector data, plus the difference between the case and dome temperatures. Both techniques collect nighttime data with corresponding pyranometer infrared-loss data. The fitting routine for detection and correction consists of two modes: dry and moist. Each mode is detected separately in the nighttime data and applied separately during the daytime. The correction to the SW daylight data is applied only if the data pass quality analysis checks. The DiffCorr1Dutt VAP output files contain a best estimate of the downwelling SW, and a best estimate of the diffuse SW. In addition, the output files contain other useful values, such as an estimate of the clear-sky Rayleigh diffuse SW amount, and standard surface meteorological measurements.

For more details, see http://science.arm.gov/vaps/diffcorr1dutt.stm.

Output Products

• siros1dutt : Solar and Infrared Radiation Observing Station (SIROS): 1-min data with Dutton correction
• sirs1dutt : SIRS: derived, correction of downwelling shortwave diffuse hemispheric measurements using Dutton and full algorithm

Primary Measurements

The following measurements are those considered scientifically relevant.

• Shortwave broadband diffuse downwelling irradiance
• Shortwave broadband direct normal irradiance
• Shortwave broadband total downwelling irradiance

Locations

• North Slope Alaska (NSA)
  • Central Facility, Atqasuk AK (C2)
  • Central Facility, Barrow AK (C1)
• Southern Great Plains (SGP)
  • Ashton, KS (E9)
  • Byron, OK (E11)
  • Central Facility, Lamont, OK (C1)
  • Coldwater, KS (E8)
  • Cordell, OK (E22)
  • Cyril, OK (E24)
  • El Reno, OK (E19)
  • Elk Falls, KS (E7)
  • Halstead, KS (E5)
  • Hillsboro, KS (Extended) (E2)
  • Lamont, OK (Extended) (E13)
  • Larned, KS (E1)
  • LeRoy, KS (E3)
  • Meeker, OK (Extended) (E20)
  • Morris, OK (Extended) (E18)
  • Okmulgee, OK (E21)
  • Pawhuska, OK (E12)
  • Plevna, KS (E4)
  • Ringwood, OK (E15)
  • Seminole, OK (E25)
  • Towanda, KS (E6)
  • Tyro, KS (E10)
  • Vici, OK (Extended) (E16)
• Tropical Western Pacific (TWP)
  • Central Facility, Manus I., PNG (C1)
  • Central Facility, Nauru Island (C2)