Editorial Type:
Article
Article Type:
Research Article

Sun Glint Contamination in ATSR-2 Data: Comparison of Observations and Values Calculated from the Measured 1.6-μm Reflectivities

Albin M. Závody Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, United Kingdom

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Andrew R. Birks Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, United Kingdom

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Print Publication:
01 May 2004
DOI:
https://doi.org/10.1175/1520-0426(2004)021<0787:SGCIAD>2.0.CO;2
Page(s):
787–798
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Abstract

The effect of radiation from the sun reflected at the sea surface on the 11- and 12-μm brightness temperatures measured by the Along-Track Scanning Radiometer ATSR-2 has been investigated. An attempt was made to determine its magnitude by comparing nadir-view and forward-view brightness temperature differences in glint and nonglint regions, and the results are compared with theoretical predictions computed by using the 1.6-μm reflectivity data. Atmospheric absorption and the polarization sensitivity of the instrument have been fully taken into account.

The results show that temperature increases of a few tens of millikelvins are possible even over the open ocean, and that they correlate well with the measured 1.6-μm reflectivity values. A scheme for correcting the sun glint contamination is proposed.

Corresponding author address: Dr. A. R. Birks, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom. Email: a.r.birks@rl.ac.uk

Abstract

The effect of radiation from the sun reflected at the sea surface on the 11- and 12-μm brightness temperatures measured by the Along-Track Scanning Radiometer ATSR-2 has been investigated. An attempt was made to determine its magnitude by comparing nadir-view and forward-view brightness temperature differences in glint and nonglint regions, and the results are compared with theoretical predictions computed by using the 1.6-μm reflectivity data. Atmospheric absorption and the polarization sensitivity of the instrument have been fully taken into account.

The results show that temperature increases of a few tens of millikelvins are possible even over the open ocean, and that they correlate well with the measured 1.6-μm reflectivity values. A scheme for correcting the sun glint contamination is proposed.

Corresponding author address: Dr. A. R. Birks, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom. Email: a.r.birks@rl.ac.uk

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Journal of Atmospheric and Oceanic Technology

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