"SWFLUXANAL" VAP Process
Instrument Categories: Radiometric, Cloud Properties
Description: Shortwave Flux Analysis
The SW (shortwave) Flux Analysis VAP applies a clear-sky detection and fitting technique (Long and Ackerman 2000) to data from broadband SW radiometers located at the Southern Great Plains site. This technique uses hemispheric, broadband total- and diffuse-shortwave irradiance measurements to identify clear-sky periods using the known characteristics of typical clear-sky irradiance time series. These clear-sky estimates are then used to infer the effect of cloudiness on the measured downwelling SW at 1-minute resolution for daylight hours. The 1-minute resolution analysis also includes data quality assessment that goes beyond standard min/max/delta and component comparison testing. The SW Flux Analysis VAP also uses a technique (Long et al. 1999) to infer average fractional sky cover at 15-minute resolution for solar elevation angles 10° or greater.For more details, see http://science.arm.gov/vaps/swflux.stm.
Value-Added Products (VAPs) Produced
- 15swfanalbrs1long - Short Wave Flux Analysis: 15-min resolution on BRS data, Long algorithm
- 15swfanalsiros1long - Short Wave Flux Analysis: 15-min resolution on SIROS data, Long algorithm
- 15swfanalsirs1long - Short Wave Flux Analysis: 15-min resolution on SIRS data, Long algorithm
- 15swfanalskyrad1long - Short Wave Flux Analysis: 15-min resolution on SKYRAD data, Long algorithm
- 15swfcldfac1long - Fractional cloud cover, clear-sky and all-sky shortwave flux for each of 25 individual SGP facilities.
- 15swfcldgrid1long - Gridded (0.25 x 0.25 lat/lon) fractional cloud cover, clear-sky and all-sky shortwave flux over the SGP site.
- 1swfanalbrs1long - Short Wave Flux Analysis: 1-min resolution on BRS data, Long algorithm
- 1swfanalsiros1long - Short Wave Flux Analysis: 1-min resolution on SIROS data, Long algorithm
- 1swfanalsirs1long - Short Wave Flux Analysis: 1-min resolution on SIRS data, Long algorithm
- 1swfanalskyrad1long - Short Wave Flux Analysis: 1-min resolution on SKYAD data, Long algorithm
Primary Measurements
The following measurements are those considered scientifically relevant. Refer to the datastream (netcdf) file headers for the list of all available measurements, including those recorded for diagnostic or quality assurance purposes.
- Cloud fraction
- Longwave broadband downwelling irradiance
- Shortwave broadband diffuse downwelling irradiance
- Shortwave broadband direct downwelling irradiance
- Shortwave broadband total downwelling irradiance
- Surface albedo
Sites / Facilities
Note: Click the "
" to expand/collapse the list.
- Southern Great Plains (SGP)
- Ashton, KS (E9)
- Byron, OK (E11)
- Central Facility, Lamont, OK (C1)
- Coldwater, KS (E8)
- Cordell, OK (E22)
- Cyril, OK (E24)
- Earlsboro, OK (E27)
- 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)
- Southern Great Plains Network (N1)
- Towanda, KS (E6)
- Tyro, KS (E10)
- Vici, OK (Extended) (E16)
- Tropical Western Pacific (TWP)
- Central Facility, Darwin, North Australia (C3)
- Central Facility, Manus I., PNG (C1)
- Central Facility, Nauru Island (C2)
