Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ijrs....8.1501d&link_type=abstract
International Journal of Remote Sensing (ISSN 0143-1161), vol. 8, Oct. 1987, p. 1501-1508. CNR-supported research.
Physics
3
Advanced Very High Resolution Radiometer, Calibrating, High Resolution, Microwave Radiometers, Noaa Satellites, Satellite-Borne Instruments, Black Body Radiation, Error Analysis, Mercury Cadmium Tellurides, Radiative Transfer, Sea Surface Temperature
Scientific paper
The in-flight two-point calibration of the AVHRR-2 radiometer introduces an error in the brightness temperature derived from the 11 microns and 12 microns channels, due to the nonlinearity of the sensor response. The NOAA Users' Guide recommends assuming a negative value for the open space radiance to reduce this error for the range 225-310 K. This range, however, is too large for typical sea surface temperature variations, and differences as great as 0.4 deg K are still present in the derived 11 microns brightness temperature. This error is further amplified in the sea surface temperature, when estimated with the split window technique, as can be shown by radiative transfer model calculations. For this reason, a new practical calibration scheme is proposed to minimize the error due to the nonlinearity of the sensor response, over the range of radiances from the sea surface.
Dalu Gianni
Viola Alfredo
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