Aircraft measurements of SST using IR-radiometer and temperature corrections due to atmospheric effects |
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| Authors: | H S S Sinha S V Kasture V Satyan R M Pandya P A Solanki |
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| Institution: | 1. Physical Research Laboratory, Navrangpura, 380 009, Ahmedabad, India
2. Space Applications Centre, Jodhpur Tekra, 380 053, Ahmedabad, India
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| Abstract: | Using an airborne scanning IR-radiometer, measurements of sea surface temperature (SST) were made from nine different levels in the Sandheads region of the Bay of Bengal on 5 October 1978. To retrieve SST from the observed radiances a temperature correction scheme, which uses the radiosonde data in the vicinity of flight area, has been generated. Atmospheric effects which have been considered include absorption due to water vapour and carbon dioxide, and the re-emission from different atmospheric layers. The radiances observed at different altitudes when corrected by our scheme yield a fairly consistent value of SST. The special ship measurements of SST, at the same location, are found to have very good agreement with the SST retrieved from the observed radiances using our scheme. The temperature corrections turn out to be 0·3 and 3·3°C at 600 and 3000 meters respectively for the type of atmosphere which has been used in our study. |
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