| Project/Area Number |
21540457
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Japan, Meteorological Research Institute |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
FUJII Yosuke 気象庁気象研究所, 海洋研究部, 部長 (60343894)
MATSUMOTO Satoshi 気象庁気象研究所, 海洋研究部, 研究官 (00414516)
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| Co-Investigator(Renkei-kenkyūsha) |
USUI Norih 気象庁気象研究所, 海洋研究部, 研究官 (50370333)
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| Research Collaborator |
松本 聡 気象庁地球環境, 海洋部
石崎 士郎 気象庁地球環境, 海洋部
杉本 裕之 気象庁地球環境, 海洋部
沢田 謙 気象大学校, 講師
YU Jason 台湾中山大学, 教授
FRANCOIS Xavier le dimet フランスグルノーブル大学, 教授
MAGDALENA Balmaseda ヨーロッパ中期予報センター
JIANG Zhu 中国大気物理学研究所, 教授
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 北太平洋中層水 / 低塩化 / トレンド / アジョイント法 / 逆追跡 / データ同化 / 海洋再解析 / 黒潮続流 / 淡水化 / 長期気候変動 / 随伴逆追跡 / 温暖化 / 黒潮続流域 / 随伴逆探索 |
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| Research Abstract |
A multi-decadal freshening trend is found in the mid-depth layer in a large part of the North Pacific subtropical gyre through the analysis of synthesis data of an ocean model and observations generated by an ocean data assimilation system. In particular, the trend is large in the Kuroshio-Oyashio mixing area east of Japan. The backward tracing of water mass using an adjoint model indicates that freshened water in the mixing intrudes around 160°E into the subtropical gyre after advected by the Kuroshio, and that it results in the freshening of entire the tropical gyre.
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