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Warming and oxygen decrease of intermediate water in the northwestern North Pacific, originating from the Sea of Okhotsk, 1955-2004

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Title: Warming and oxygen decrease of intermediate water in the northwestern North Pacific, originating from the Sea of Okhotsk, 1955-2004
Authors: Nakanowatari, Takuya Browse this author →KAKEN DB
Ohshima, Kay I. Browse this author →KAKEN DB
Wakatsuchi, Masaaki Browse this author →KAKEN DB
Keywords: intermediate
warming
North Pacific
Issue Date: 17-Feb-2007
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 34
Issue: 4
Start Page: L04602
Publisher DOI: 10.1029/2006GL028243
Abstract: On the basis of all available data, it is found that intermediate water temperature on the 26.8–27.4σθ isopycnals in the northwestern North Pacific has significantly increased during the past 50 years. The largest warming area exists in the western part of the Sea of Okhotsk with a 0.68°C/50-yr temperature increase observed at 27.0σθ. The warming in the Pacific is found over the Oyashio and Subarctic Current regions, where the Okhotsk water extends along the subarctic gyre. This suggests that the warming originates from the Sea of Okhotsk. The warming trend is also accompanied by the significant decreasing trend of dissolved oxygen content, suggesting the weakening of overturning in the northwestern North Pacific. We propose that these trends of the water mass property are caused by a decrease in dense shelf water production in the northwestern shelf of the Sea of Okhotsk, which is a sensitive area to the current global warming.
Rights: An edited version of this paper was published by AGU. Copyright 2007, American Geophysical Union, Geophysical Research Letters, Vol. 34-4.
Type: article (author version)
URI: http://hdl.handle.net/2115/20028
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中野渡 拓也

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