Shallow Temperature Inversions in the Sea to the East of Honshu, Japan

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  • NAGATA Yutaka
    Scripps Institution of Oceanography, University of California, San Diego. On leave from Geophysical Institute, University of Tokyo

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  • 本州東方海域におけける表層温度逆転層について

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The statistical properties of shallow temperature inversions in the sea to the east of Hohshu, Japan are surveyed by using data provided from BT observations. The region may be divided by lines corresponding to the Kuroshio front and Oyashio front. The Oyashio front gives the southern boundary of the influence of sub-arctic water masses, and large-scale inversions are often seen north of the Oyashio front. The Kuroshio front gives the southern boundary of the area where temperature inversions are abundant. Temperature inversions seldom occur to the south of the Kuroshio. The characteristic inversion thickness has the tendency to increase from south to north in the region under consideration, whereas the characteristic inversion temperature difference is almost constant to the north of the Kuroshio, except that just north of the Kuroshio it shows a marked maximum value corresponding to the position of cold water belt. The frequency distribution and the seasonal variation of the inversion thickness of the large-scale inversions seems to differ from those of the small-scale inversions. The conventional thickness measure of 50 m can be used to classify the inversion layers into large-scale and small-scale inversions in this area.

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