The GASP product is a retrieval of the Aerosol Optical Depth (AOD) made from the current GOES-East and GOES-Westvisible imagery. Satellite measured aerosol optical depth (AOD) has been shown to be a good proxy for pollution monitoring especially when long-range transport is involved. This product is available at a 30-minute interval and 4 km X 4 km spatial resolution during the sunlit portion of the day. Radiative Transfer calculations assume a continental aerosol model and Lambertian surface. Comparisons of GOES AOD with AERONET AOD show that GOES data are accurate at the 30% level for AODs greater than 0.1.

Example result / latest result (if near-real time)


Satellite: GOES (NOAA)
Instrument(s): GOES-East and GOES-West
Instrument/algorithm PI: Shobha Kondragunta and Matthew Seybold (NOAA)
Contact details: Shobha.Kondragunta[at]noaa.gov, Matthew.Seybold[at]noaa.gov
Parameter(s): AOD
Aerosol algorithm: GASP
Cloud screening: CLAVR
Aerosol model: continental aerosol model
Retrieval assumptions: lambertian surface, background reflectance from minimum reflectance of a 28 day period
Retrieval limitations: one fixed aerosol model
Spatial, temporal coverage: NRT, USA domain including Hawaii and Alaska
Spatial, temporal resolution: 4x4km² / geostationary / 30 minutes repeat cycle
Operations status: operational
Validation status: intercomparison with ground-based and MODIS observations
Quality control: QA/QC based on viewing geometry (solar zenith angle and scattering angle), spatial variability tests, and surface reflectance.
last algorithm version: No version number but algorithm updated in January 7, 2009
last validation: Prados et al., JGR, 2007