Examination of the merged sea surface temperature using wavelet analysis |
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Authors: | Email author" target="_blank">Kohtaro?HosodaEmail author Hiroshi?Kawamura |
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Institution: | (1) Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, 980-8578 Aoba, Sendai, Japan;(2) Present address: Earth Observation Research and Application Center, Japan Aerospace Exploration Agency, 1-8-10 Harumi, Chuo-ku, 104-6023 Tokyo, Japan |
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Abstract: | In the previous study, merged sea surface temperature (SST) dataset called “New Generation SST” has been produced from several
infrared and microwave satellite SSTs through an objective mapping. Here we examine the merged SST by comparison with moored
buoy SST at 1 m depth, which is treated as true sea surface temperature. Comparison between wavelet spectra of merged and
buoy SSTs shows that the former have larger amplitudes than those of the latter, which is partly explained as an aliasing
effect due to TRMM Microwave Imager (TMI) aboard Tropical Rainfall Measuring Mission (TRMM) sampling on merged products. Coherency
between wavelet-decomposed merged and buoy SSTs has high values in autumn and low ones in winter to spring. In winter, phase
differences between them are positive, meaning that wavelet components of merged SST lag those of buoy SST. Reasons for delay
and low coherency are: (1) seasonal components of merged SSTs are strongly affected by a lack of infrared SSTs due to clouds
in winter, and (2) small-scale oceanic features, undetectable by coarse-resolution microwave SSTs, are blurred by the merging
process. Improvements of merging methodology are discussed with regard to present study results. |
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Keywords: | Merged SST satellite SST wavelet analysis Kuroshio recirculation region |
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