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The effect of windspeed on sea surface temperature retrieval from space
Author(s) -
Harris A. R.,
Brown S. J.,
Mason I. M.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl01276
Subject(s) - environmental science , remote sensing , emissivity , nadir , brightness temperature , radiometer , satellite , altimeter , wind speed , scatterometer , meteorology , radiometry , brightness , atmospheric correction , sea surface temperature , atmospheric sciences , geology , physics , optics , astronomy
The effect of windspeed on water emissivity, whilst being negligible around normal incidence, becomes significant above angles of about 50°. We calculate the effect of windspeed on retrieved sea surface temperature and show that errors become significant for the potentially very accurate Along Track Scanning Radiometer (ATSR, carried on board ESA's first remote sensing satellite, ERS‐1) since brightness temperatures measured at ≈56°, as well as those measured at nadir, are used to provide improved atmospheric correction. We show that when an SST retrieval algorithm generated assuming zero windspeed is applied to brightness temperatures calculated for windspeeds of 5, 10 and 15 m/s, a potential error of up to 0.4 K is introduced. Since coincident windspeed data can be obtained from the ERS‐1 radar altimeter, accurate correction can be made for this effect and we provide a preliminary algorithm for the correction of ATSR SST data.