Studies on the variability of sea ice and its effects on ocean circulation

• Ohshima Kay I.

  Institute of Low Temperature Science, Hokkaido University

Bibliographic Information

Other Title

• 海氷域の変動とその海洋循環に与える影響に関する研究
• 2015年度日本海洋学会賞受賞記念論文 海氷域の変動とその海洋循環に与える影響に関する研究
• 2015ネンド ニホン カイヨウ ガッカイショウ ジュショウ キネン ロンブン カイヒョウイキ ノ ヘンドウ ト ソノ カイヨウ ジュンカン ニ アタエル エイキョウ ニ カンスル ケンキュウ

Abstract

Global thermohaline and material circulations originate from dense water formation through sea-ice production in the polar and ice-covered oceans. Due to difficulties associated with in situ observations, sea-ice production and deep/intermediate water formation were not well understood until recently. Methods for estimating sea-ice production on large scales have been developed using the thin-ice algorithm of satellite microwave radiometer data and heat flux calculation. Mapping of sea-ice production in the Southern Ocean has shown that the Cape Darnley polynya is the second highest ice production area after the Ross Ice Shelf polynya. Furthermore, direct observations have revealed that this polynya is the missing (fourth) source of Antarctic Bottom Water. The Okhotsk Northwestern polynya exhibits the highest ice production in the Northern Hemisphere, and the resultant dense water formation leads to overturning in the North Pacific, that extends to the intermediate layer. The dense water is transported southward by the East Sakhalin Current, which is the western boundary current of the Okhotsk Sea. The polynya ice production has shown a significant decrease over the past 30-50 years, likely causing the weakening of the North Pacific overturning. These studies demonstrate the strong linkage between variabilities of sea-ice production and bottom/intermediate water formation.

Journal

• Oceanography in Japan

  Oceanography in Japan 27 (2), 75-96, 2018

  The Oceanographic Society of Japan

Keywords

• thermohaline circulation
• Antarctic Bottom Water
• dense shelf water
• coastal polynya
• sea-ice production
• satellite microwave radiometer
• Sea of Okhotsk
• East Sakhalin Current

Details

• CRID: 1390282679356941440
• NII Article ID: 130006549589
• NII Article ID: 40021543635
• NII Book ID: AN10382760
• DOI: 10.5928/kaiyou.27.2_75
• ISSN: 21863105
• ISSN: 09168362
• NDL BIB ID: 028986194
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I028986194
• Web Site: https://www.jstage.jst.go.jp/article/kaiyou/27/2/27_75/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed