Four-dimensional variational ocean reanalysis: a 30-year high-resolution dataset in the western North Pacific (FORA-WNP30) |
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| Authors: | Norihisa Usui Tsuyoshi Wakamatsu Yusuke Tanaka Nariaki Hirose Takahiro Toyoda Shiro Nishikawa Yosuke Fujii Yasushi Takatsuki Hiromichi Igarashi Haruka Nishikawa Yoichi Ishikawa Tsurane Kuragano Masafumi Kamachi |
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| Institution: | 1.Oceanography and Geochemistry Research Department,Meteorological Research Institute,Tsukuba,Japan;2.Center for Earth Information Science and Technology,Japan Agency for Marine-Earth Science and Technology,Yokohama,Japan |
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| Abstract: | We produced a four-dimensional variational ocean re-analysis for the Western North Pacific over 30 years (FORA-WNP30). It is the first-ever dataset covering the western North Pacific over 3 decades at eddy-resolving resolution. The four-dimensional variational analysis scheme version of the Meteorological Research Institute Multivariate Ocean Variational Estimation system (MOVE-4DVAR) is employed to conduct a long-term reanalysis experiment during 1982–2012. After evaluating the basic performance of FORA-WNP30, the interannual to decadal variability is analyzed. Overall, FORA-WNP30 reproduces basic features in the western North Pacific well. One of outstanding features in FORA-WNP30 is that anomalous events such as the Kuroshio large meander and anomalous intrusion of the Oyashio in the 1980s, when there were no altimeter data, are successfully reproduced. FORA-WNP30 is therefore a valuable dataset for a variety of oceanographic research topics and potentially for related fields such as climate study, meteorology and fisheries. |
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