日本海中層における輸送時間の直接シミュレーション

概要

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In order to represent the distribution of transit time of the seawaters accurately, the transit time tracer is introduced in an isopycnic coordinate ocean model. This passive tracer is initialized by the time of subduction from the sea surface mixed layer to the isopycnic interior layers, and is calculated by the normal advection-diffusion equation in the isopycnic layers. The residence time is directly given by the transit time tracer varying at each time and position. We apply this method in the Japan Sea, and attempt to estimate the residence time for the intermediate water characterized by the salinity-minimum layer. The simulated residence time in the intermediate layer is 0-4 years for the northern part, 6-10 years for the southwestern part, and 12-16 years for the southeastern part of the Japan Sea, respectively.
九州大学大学院総合理工学府,Interdisciplinary Graduate School of Engineering Sciences, Kyushu Universityの論文