Zonally asymmetric response of the Japan Sea to synoptic pressure forcing |
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| Authors: | Daisuke Inazu Naoki Hirose Shoichi Kizu Kimio Hanawa |
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| Institution: | (1) Department of Geophysics, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan;(2) Dynamics Simulation Research Center, Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan |
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| Abstract: | We investigated the sea level response of the Japan Sea to changes in atmospheric pressure using barotropic shallow water
models driven by idealized synoptic pressure forcing. The regional response lags behind the synoptic pressure forcing because
the adjustment is slowly established by water exchange through narrow, shallow straits. The sea level response of the realistic
Japan Sea to the idealized forcing varies with geographical location and shows zonally asymmetric variations in amplitude
and phase. The simulated response is in good agreement with the observed response of sea level recorded at Japanese coastal
tide gauges. The results of a simple one-dimensional model indicate that the zonally asymmetric pattern, with an eastward-propagating
pressure system, is essentially caused by bottom friction in shallow straits. This asymmetry arises if the typical wavelength
of the synoptic pressure system is slightly larger than the spatial scale of the Japan Sea. |
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| Keywords: | Sea level barometric response zonal asymmetry Japan Sea synoptic atmospheric pressure forcing interbasin water exchange |
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