Geostrophy in the Intermediate and Deep Layers of the Kuroshio and Its Recirculation Regions South of Japan |
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Authors: | Motohiko Kashima Shiro Imawaki Shin-Ichiro Umatani Hiroshi Uchida Yuji Hashibe Hiroshi Ichikawa Masao Fukasawa |
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Institution: | (1) Japan Science and Technology Corporation, Honcho, Kawaguchi, Saitama 332-0012, Japan;(2) Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;(3) Japan Marine Science and Technology Center, Natsushima, Yokosuka, Kanagawa 237-0061, Japan;(4) Space Engineering Development Co. Ltd., Nakano, Nakano-ku, Tokyo 164-0001, Japan;(5) Faculty of Fisheries, Kagoshima University, Kagoshima 890-0056, Japan |
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Abstract: | Theoretically, the geostrophic approximation holds for the low-frequency flow field, but no detailed examination has been
done on how well the estimated geostrophic velocity corresponds with the observed velocity. Intensive surveys were carried
out during 1993–1995 in the Kuroshio and its recirculation regions south of Shikoku, Japan, including repeated hydrographic
surveys and direct current measurements at nominal depths of 700, 1500 and 3000 m. For these depth intervals, vertical differences
of estimated geostrophic velocity are compared with those of observed velocity. For the intermediate layer (between 700 and
1500 m depths), the slope of the regression line is 0.99, correlation coefficient is 0.98, and the root-mean-square of difference
from geostrophic balance is 2.8 cm/s which is close to the estimated error of 2.1 cm/s. For the deep layer (between 1500 and
3000 m depths), the corresponding values are 0.82, 0.93, 1.2 cm/s and 2.0 cm/s, respectively. The results indicate that the
estimated geostrophic velocity compares well with the observed velocity in these regions.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Geostrophy Kuroshio ASUKA moored current meters |
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