オホーツク海の海氷面積と冬の大気循環との相互作用

• 山崎 孝治

  北海道大学 大学院地球環境科学研究科 地球フロンティア研究システム・国際北極圏研究センター

書誌事項

タイトル別名

• Interaction between the wintertime atmospheric circulation and the variation in the sea ice extent of the Sea of Okhotsk.
• オホーツクカイ ノ カイヒョウ メンセキ ト フユ ノ タイキ ジュンカン ト ノ ソウゴ サヨウ

抄録

The sea-ice extent of the Sea of Okhotsk varies according to the wintertime atmospheric circulation. On the other hand, the variation of the sea-ice extent influences on atmospheric circulation. The interaction between the wintertime atmospheric circulation and the variation in the sea ice extent of the Sea of Okhotsk is investigated by correlation analyses between the January-February mean atmospheric circulation and the sea ice extent including lag correlations.<BR>The sea ice tends to expand when winds have westerly anomalies over the Sea of Okhotsk and the low-altitude temperature is low at the upstream side of the Sea. From the atmospheric conditions around the Sea of Okhotsk and the sea ice extent in early January, a multiple regression equation can predict the January-February mean sea-ice extent with good accuracy. A tendency for warm climate over Japan south of Tohoku is seen when the sea-ice extent becomes large. In this relationship, the correlation becomes better when the sea-ice extent leads the temperature. This suggests influence of sea ice on climate in Japan. The sea-ice extent has correlations with the hemispheric-scale atmospheric circulation such as the North Atlantic Oscillation/Arctic Oscillation. A correlation with the Western Pacific pattern is also found.<BR>In order to extract the signal of the influence of the sea ice on the atmospheric circulation, we define a 4-point index for 500hPa geopotential height. The points of the index are located over Japan, Kamchatka, Alaska and North America. When the sea ice and the index are simultaneous or sea ice lags the index, the correlation becomes maximum. Then, a 2-point index which consists only of the Alaska and North America points is defined. For the 2-point index, the maximum correlation occurs when the sea ice leads the atmosphere by one month. Considering this lag, the variation in the sea ice extent of the Sea of Okhotsk affects the atmospheric circulation over the Alaska and North America.

収録刊行物

• 雪氷

  雪氷 62 (4), 345-354, 2000

  公益社団法人 日本雪氷学会

キーワード

• オホーツク海の海氷
• 海氷・大気相互作用
• 北大西洋振動
• 西太平洋パターン

詳細情報

• CRID: 1390282681438200832
• NII論文ID: 10004644921
• NII書誌ID: AN00131221
• DOI: 10.5331/seppyo.62.345
• ISSN: 18836267
• ISSN: 03731006
• ISSN: http://id.crossref.org/issn/03731006
• NDL書誌ID: 5415757
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5415757
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可