High-resolution synthetic monitoring by a 4-dimensional variational data assimilation system in the northwestern North Pacific |
| |
Authors: | Yoichi Ishikawa Toshiyuki Awaji Takahiro Toyoda Teiji In Kei Nishina Tomoharu Nakayama Shigeki Shima Shuhei Masuda |
| |
Affiliation: | aDepartment of Geophysics, Graduate school of Science, Kyoto University, Kitashirakawa-oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan;bFrontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 173-25 Showamachi, Kanazawa-ku, Yokohama City, Kanagawa 236-0001, Japan;cJapan Marine Science Foundation, 4-24 Minato-machi, Mutsu City, Aomori, 035-0064, Japan |
| |
Abstract: | A data assimilation system is applied to the integrated monitoring of oceanic states in the northwestern North Pacific by combining a high resolution ocean general circulation model with an adjoint method. A comparison of assimilation results with observations shows that the system is better able to represent synoptic features of ocean circulation than do models or data alone. Furthermore, meso-scale features associated with frontal structures and eddies, which are often seen in the Kuroshio and Oyashio extension regions and the Sea of Japan, are better defined in the assimilation results. These features suggest that our 4D-VAR high-resolution data assimilation system is capable of providing time series data which satisfy the model physics and fit the observations, and hence the ocean state derived from our system has greater information content than that obtained from earlier methods. |
| |
Keywords: | Data assimilation Adjoint method Ocean general circulation model Kuroshio– Oyashio system |
本文献已被 ScienceDirect 等数据库收录! |
|