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Potential for improved ATSR dual‐view SST retrieval

Murray, MJ; Allen, MR; Merchant, CR; Harris, AR; (1998) Potential for improved ATSR dual‐view SST retrieval. Geophysical Research Letters , 25 (17) 3363 - 3366. 10.1029/98GL02389. Green open access

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Abstract

Recent validation studies have confirmed that the first along‐track scanning radiometer (ATSR) can retrieve sea surface temperature (SST) to an accuracy of 0.3K 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 >0.6K to <0.1K is achieved, with standard deviation approximately halved. We also examine the treatment of optical pathlength variation around the ATSR swath.

Type: Article
Title: Potential for improved ATSR dual‐view SST retrieval
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/98GL02389
Publisher version: http://dx.doi.org/10.1029/98GL02389
Language: English
Additional information: Copyright 1998 by the American Geophysical Union
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/180275
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