Evaluation of the Diurnal Warming of Sea Surface Temperature Using Satellite-Derived Marine Meteorological Data |
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Authors: | Yoshimi Kawai Hiroshi Kawamura |
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Institution: | (1) Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan |
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Abstract: | In order to produce a high-quality sea surface temperature (SST) data set, the daily amplitude of SST (ΔSST) should be accurately
known. The purpose of this study was to evaluate the diurnal variation of sea surface temperature in a simple manner. The
authors first simulated ΔSST with a one-dimensional numerical model using buoy-observed meteorological data and satellite-derived
solar radiation data. When insolation is strong, the model-simulated 1-m-depth ΔSST becomes much smaller than the in situ
value as wind speed decreases. By forcibly mixing the sea surface layer, the model ΔSST becomes closer to the in situ value.
It can be considered that part of this difference is due to the turbulence induced by the buoy hull. Then, on the assumption
that the model results were reliable, the authors derived a regression equation to evaluate ΔSST at the skin and 1-m depth
from daily mean wind speed (U) and daily peak solar radiation (PS). ΔSST is approximately proportional to In(U) and (PS)2, and the skin ΔSST estimated by the equation is not inconsistent with in situ observation results reported in past studies.
The authors prepared maps of PS and U using only satellite data, and demonstrated the ΔSST evaluation over a wide area. The result showed that some wide patchy
areas where the skin ΔSST exceeds 3.0 K can appear in the tropics and the mid-latitudes in summer.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Sea surface temperature satellite observation diurnal warming solar radiation wind speed numerical model |
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