Sea surface temperatures from Daedalus ATM data—preliminary results

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Abstract
Daedalus Advanced Thematic Mapper (ATM) data, obtained between 12.14GMT and 13.44GMT on 19 June 1984 as part of the Natural Environment Research Council's airborne MSS-84 campaign, have been used to calculate sea surface temperatures in the western English Channel. The method described involves sensor calibration, calculation of brightness temperatures, removal of a systematic ‘brightening’ of the raw data across a scanline and estimation of the atmospheric correction from theoretical considerations. Results show that calculated sea surface temperatures are higher than the brightness temperatures by as much as 3 deg K at nadir and 4 deg K. at the scanline extremities. For interest, the brightness temperatures calculated from near simultaneous AVHRR/2 data and results obtained from a multi-channel correction of the AVHRR data, have been added.