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Yoichi Ishikawa¹
Toshiyuki Awaji², Teiji In¹, Tomoharu Nakayama¹, Yasutaka Matsuura, Shigeki Shima¹,

(1) Mutsu Marine Laboratory, Marine Science Foundation, Japan
(2) Kyoto University, Kyoto, Japan

Main authors appear in bold

Many synthesis data sets have been recently produced by a variety of data assimilation systems for large scale ocean circulation associated with the GODAE project. These datasets have various characteristics because of different numerical models, observation data and assimilation schemes, and hence the inter-comparison is increasingly made on the basis of several important metrics. However, the GODAE products are not necessarily designed for close linkage with downscaling systems. Therefore, it is meaningful to investigate the following question for both developer and user of GODAE products: "What is the good assimilation product for the downscaling system?"
To answer this question, we examine the result of the data assimilation system focusing on the circulation of the northwestern North Pacific (Ishikawa et al., 2007), which is used in the downscaling system for the nowcast/forecast of the coastal circulation off Rokkasho, northern part of the Honshu Island (In et al., 2007). The result of the analysis shows the importance of the dynamical consistency between the GODAE products and downscaling model in both the scientific and the computational performance (and toward a variety of applications).

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