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Yasumasa Miyazawa¹

(1) Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Japan

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For better understanding of the Kuroshio variability and its predictability south of Japan, an eddy resolving ocean forecast system has been developed during the past few years, as a part of Japan Coastal Ocean Predictability Experiment (JCOPE). Cooperative study with the Fishery Research Agency enabled us to incorporate large amount of in-situ data obtained by local fishery research agencies (FR-data) into the JCOPE system. To effectively assimilate the FR-data, we developed a three-dimensional variational data assimilation (3DVAR) system. The assimilation and forecast skills are evaluated by a regional metrics defined using both the FR-data and surface velocity data calculated from satellite altimetry and drifter data. The intensive use of the regional metrics is quite useful to determine unknown parameters built-in the 3DVAR system.

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