2009 Fiscal Year Final Research Report
Elucidating mechanisms of intermediate layer warming in the Sea of Okhotsk and North Pacific.
| Project/Area Number |
19340131
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Hokkaido University |
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Principal Investigator |
MITSUDERA Humio Hokkaido University, 低温科学研究所, 教授 (20360943)
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| Co-Investigator(Kenkyū-buntansha) |
OHSHIMA Keiichiro 北海道大学, 低温科学研究所, 教授 (30185251)
NAKAMURA Tomohiro 北海道大学, 低温科学研究所, 講師 (60400008)
ONO Kazuya 北海道大学, 低温科学研究所, 技術職員 (40396320)
ONO Tsuneo 水産総合研究センター, 北海道区水産研究所, 室長 (40371786)
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| Project Period (FY) |
2007 – 2009
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| Keywords | オホーツク海 / 熱塩循環 / 中層水 / 温暖化 |
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| Research Abstract |
This study is aimed at elucidating characteristics of intermediatelayer warming in the Sea of Okhotsk and western subarctic gyre of the North Pacific, and its mechanisms from a point of view of thermohaline circulation. Dense shelf water (DSW) produced over the northern shelves in the Okhotsk has freshened about 0.1 PSU in the last 50 years, causing warming in the 26.8-27.0σ_θ. isopycnals Numerical experiments indicate that air temperature rise (which causes decrease in sea ice production), increase of fresh water precipitation and wind variations are responsible for the warming.
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