Skip all navigation and jump to content Jump to site navigation
NASA Logo - Goddard Space Flight Center

+ NASA Homepage

    
Goddard Space Flight Center
About MODIS News Data Tools /images2 Science Team Science Team Science Team

   + Home
ABOUT MODIS
MODIS Publications Link
MODIS Presentations Link
MODIS Biographies Link
MODIS Science Team Meetings Link
 

 

 

Knapp, KR, Vonder Haar, TH, Kaufman, YJ (2002). Aerosol optical depth retrieval from GOES-8: Uncertainty study and retrieval validation over South America. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 107(D7-8), 4055.

Abstract
[1] An algorithm for aerosol optical depth tau retrieval from the Geostationary Observational Environmental Satellite (GOES) series is described, where the darkest pixels are used to create a spatial composite of surface reflectance. The data are calibrated and corrected for atmospheric extinction to retrieve the surface reflectance which is then used to retrieved tau. Analysis suggests that t retrieval uncertainty is +/-18-34% depending on the certainty of the assumed radiative transfer model parameters. Retrieval uncertainty is less over low surface reflectances and at large scattering angles. The retrieval algorithm is validated against Sun-sky radiometer tau measurements for aerosols emitted by biomass burning in South America during 1995 and 1998. The relative differences between observed and retrieved t are within the estimated uncertainty, having correlations ranging from 0.78 to 0.97. Further, the GOES retrievals are compared to tau retrieved using the Moderate-Resolution Imaging Spectroradiometer (MODIS) airborne simulator (MAS). The average relative difference in this comparison is 11%, thus retrieval validations are again within the estimated algorithm uncertainty. These results suggest that the GOES satellite can be used to monitor aerosols over land, while the agreement between MAS and GOES retrievals suggests the ability to combine the spectral abilities of MODIS with the temporal observations of GOES.

DOI:
10.1029/2001JD000505

ISSN:
0747-7309

FirstGov logo Privacy Policy and Important Notices NASA logo

Curator: Brandon Maccherone
NASA Official: Shannell Frazier

NASA Home Page Goddard Space Flight Center Home Page