Analysis of pathfinder SST algorithm for global and regional conditions |
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| Authors: | Ajoy Kumar Peter Minnett Guillermo Podestá Robert Evans Katherine Kilpatrick |
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| Institution: | (1) Meteorology and Physical Oceanography Division, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 33149 Miami, FL, USA |
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| Abstract: | As part of the Pathfinder program developed jointly by National Aeronautics and Space Administration (NASA) and National Oceanic
and Atmospheric Administration (NOAA) a large database ofin situ sea surface temperature (SST) measurements coincident with satellite data is now available to the user community. The Pathfinder
Matchup Database (PMDB) is a multi-year, multi-satellite collection of coincident measurements from the Advanced Very High
Resolution Radiometer (AVHRR) and broadly distributed buoy data (matchups). This database allows the user community to test
and validate new SST algorithms to improve the present accuracy of surface temperature measurements from satellites. In this
paper we investigate the performance of a global Pathfinder algorithm to specific regional conditions. It is shown that for
zenith angles less than 45°, the best-expected statistical discrepancy between satellite and buoy data is about ∼ 0.5 K. In
general, the bias of the residuals (satellite — buoy) is negative in most regions, except in the North Atlantic and adjacent
seas, where the residuals are always positive. A seasonal signal in SST residuals is observed in all regions and is strongest
in the Indian Ocean. The channel-difference term used as a proxy for atmospheric water vapor correction is observed to be
unresponsive for columnar water vapor values greater than 45 mm and high zenith angles. This unresponsiveness of the channels
leads to underestimation of sea surface temperature from satellites in these conditions. |
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| Keywords: | Sea surface temperature AVHRR satellite Indian Ocean matchup |
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