Physics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3363m&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 17, p. 3363-3366
Physics
2
Oceanography: General, Oceanography: General: Instruments And Techniques
Scientific paper
Recent validation studies have confirmed that the first along-track scanning radiometer (ATSR) can retrieve sea surface temperature (SST) to an accuracy of 0.3 K even in the presence of heavy atmospheric aerosol. However, using the standard (pre-launch) retrieval, this accuracy is achieved only when data from all three thermal channels (3.7, 11 and 12 μm) are available; in the absence of 3.7 μm data, retrieved SSTs are subject to significant cold bias. As 3.7 μm data are useful only for nighttime observations, and ATSR's 3.7 μm channel failed in May 1992, only 11 and 12 μm data informed SST derivation for most of the 1991-1996 mission. We demonstrate the potential for improvement in this retrieval, based on comparison of observed brightness temperatures with precise SSTs derived using 3.7 μm data. A reduction in global-mean cold bias from >0.6 K to <0.1 K is achieved, with standard deviation approximately halved. We also examine the treatment of optical pathlength variation around the ATSR swath.
Allen Meghan Rose
Harris Robert A.
Merchant C. J.
Murray James M.
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