Open and coastal seas interactions south of Japan represented by an ensemble Kalman filter |
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| Authors: | Yasumasa Miyazawa Toru Miyama Sergey M Varlamov Xinyu Guo Takuji Waseda |
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| Institution: | (1) Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, 3173-25 Showamachi, Kanazawa-ku, Yokohama Kanagawa, 236-0001, Japan;(2) Center for Marine Environmental Studies, Ehime University, Matsuyama Ehime, 790-8577, Japan;(3) Graduate School of Frontier Science, The University of Tokyo, Kashiwa Chiba, 277-8563, Japan |
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| Abstract: | We investigated the feasibility of the ensemble Kalman filter (EnKF) to reproduce oceanic conditions south of Japan. We have
adopted the local ensemble transformation Kalman filter algorithm based on 20 members’ ensemble simulations of the parallelized
Princeton Ocean Model (the Stony Brook Parallel Ocean Model) with horizontal resolution of 1/36°. By assimilating satellite
sea surface height anomaly, satellite sea surface temperature, and in situ temperature and salinity profiles, we reproduced
the Kuroshio variation south of Japan for the period from 8 to 28 February 2010. EnKF successfully reproduced the Kuroshio
path positions and the water mass property of the Kuroshio waters as observed. It also detected the variation of the steep
thermohaline front in the Kii Channel due to the intrusion of the Kuroshio water based on the observation, suggesting efficiency
of EnKF for detection of open and coastal seas interactions with highly complicated spatiotemporal variability. |
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