Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...a21b10c&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #A21B-10
Physics
1640 Remote Sensing, 3360 Remote Sensing, 4275 Remote Sensing And Electromagnetic Processes (0689), 9805 Instruments Useful In Three Or More Fields
Scientific paper
. The orbit drift of the NOAA-14 satellite has significantly changed the solar geometry at the AVHRR sensor. At night the sensor is no longer shielded from the sun light by the Earth. Stray sun light can illuminate the blackbody and the telescope interior contaminating the calibration system of the thermal infrared channels. In this study, sample AVHRR level 1b data as well as related trending data from 1995 to 2000 are analyzed to characterize this problem. It is found that unlike its earlier days when the solar contamination was limited to the terminator regions in the high latitudes, the calibration system onboard NOAA-14/AVHRR now suffers from extensive contamination for the entire night portion of the orbit at all latitudes. The calibration bias is estimated to be in the order of 0.5 degree despite corrections made in the operational data processing. The impact of this calibration bias on the operational sea surface temperature retrievals is evaluated. Keywords: NOAA-14/AVHRR, orbit drift, radiometric calibration, solar contamination
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