Time-Dependent Spatial Wavenumber Spectra Derived from Merged Sea Surface Temperature Data |
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| Authors: | Kohtaro Hosoda Hiroshi Kawamura |
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| Institution: | (1) Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Aoba, Sendai 980-8578, Japan;(2) Earth Observation Research Center, National Space Development Agency of Japan, Harumi, Chuo-ku, Tokyo 104-6023, Japan |
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| Abstract: | Monthly wavenumber spectra of sea surface temperatures (SST) have been estimated in two regions near the Kuroshio, in the
recirculation and the Kuroshio Extension regions, using the merged SST product to determine the statistical parameter (spatial
decorrelation scale) required for optimal interpolation of a high-resolution SST dataset. The two-dimensional wavelet transform
was used for analysis. Estimates were made of daily mean and daily minimum SSTs. These do not significantly differ, which
suggests that the same covariance matrix can be used for the daily mean and minimum in the merging procedure. The seasonality
of wavenumber spectra is significant. There are also large differences between those in the recirculation region and in the
Kuroshio Extension region. Therefore, it is recommended that the covariance matrix in the merging process for high-resolution
SST dataset be defined as a function of time and space. Improvements of the merging methodology are discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Merged SST satellite SST two-dimensional wavelet Kuroshio recirculation region Kuroshio Extension region |
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