Elucidating mechanisms of intermediate layer warming in the Sea of Okhotsk and North Pacific.

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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.