オホーツク海とベーリング海の海氷分布についての研究

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We investigated interannual variations of sea ice cover over the Sea of Okhotsk and the Bering Sea based upon the sea ice data compiled by the National Ice Center, U.S.A. for 1972-1994. We found that, for the entire analysis period, there was no significant correlation between the interannual variation of accumulated sea ice area in the Sea of Okhotsk and that in the Bering Sea although similar variations were seen in both of them in late 1980s and early 1990s and out-of-phase variations were observed during 1970s. Decreasing trends were appeared in the sea ice area over the whole sea ice regions of the Northern Hemisphere and that in the Sea of Okhotsk. Year to year change of seasonal variations of the sea ice area in the both seas were analyzed. The seasonal variation during a particular year was categorized into two types, i.e., the typical growth and the slowly growth years. In the slowly growth year, maximum sea ice area in the Sea of Okhotsk is smaller than that in the typical growth year. The Aleutian low in the slowly growth year shifts to the east of its position in the typical growth year and relative high covers over the Sea of Okhotsk, resulting in weakened northwesterly winds that may cause retreat of sea ice extent in the slowly growth year. On the other hand, maximum sea ice area in the Bering Sea in the slowly growth year is larger than that in the typical growth year. In the slowly growth year, the Aleutian low located far to the east of its climatological position and is more intense, resulting in anomalous northerly winds over the Bering Sea that may extend the sea ice area.
社団法人日本航海学会の論文
2003-03-25

オホーツク海とベーリング海の海氷分布についての研究

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