Interannual variability of the Kuroshio transport passing through the 137°E meridian in an OGCM related to the North Pacific windstress |
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| Authors: | Yoshinobu Wakata Takashi Setou Ikuo Kaneko Hiroshi Uchida Shiro Imawaki |
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| Institution: | (1) Research Institute for Applied Mechanics, Kyushu University, Kasuga-kohen, Kasuga-shi, Fukuoka 816-8580, Japan;(2) Mitsubishi Research Institute, Otemachi, Chiyoda-ku, Tokyo 100-8141, Japan;(3) Japan Agency for Marine-Earth Science and Technology, Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan |
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| Abstract: | The interannual variability of the Kuroshio volume transport passing through the 137°E meridian south of Japan was simulated
with an ocean general circulation model (OGCM). The time series of the Kuroshio volume transport over the 1000 m depth in
the OGCM is well reproduced by the one-dimensional quasi-geostrophic (QG) vorticity equation with a windstress forcing. In
our analysis of the OGCM and QG results, we found that peaks and troughs of the time series of the Kuroshio volume transport
with 2–3 yr time-scale were induced by windstress curl, both local and immediately eastward, whereas longer time-scale variability
was also induced by windstress curl near the dateline. |
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| Keywords: | Kuroshio volume transport interannual variability quasi-geostrophic vorticity equation Rossby wave |
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