An impact of SST anomalies in the Indian Ocean in acceleration of the El Niño to La Niña transition

• OHBA Masamichi

  Graduate School of Life and Environmental Sciences, University of Tsukuba

• UEDA Hiroaki

  Graduate School of Life and Environmental Sciences, University of Tsukuba

書誌事項

タイトル別名

• An Impact of SST Anomalies in the Indian Ocean in Acceleration of the El Nino to La Nina Transition

抄録

One possible impact of sea surface temperature (SST) anomalies in the Indian Ocean (IO) on the ongoing El Niño is investigated using an air-sea coupled general circulation model (CGCM). A suite of CGCM experiments by imposing the IO basin-wide warming (BW) and IO dipole/zonal mode (IODZM) are conducted to assess the feedback effects of the El Niño-related SST anomalies on the Pacific. While the IODZM during boreal fall does not have a significant impact on the Pacific sector, the BW during boreal winter enhances the surface easterlies over the equatorial Western Pacific (WP) during the maturedecay phase of El Niño. The strengthened easterlies act to enhance the SST cooling over the WP, thereby the zonal gradient of SST between the IO and WP is greater than the climatology. These enhanced WP easterlies induce an advanced transition to the La Niña phase, which is caused by the upwelling ocean Kelvin waves. These results imply that the BW in the IO, to some extent, can be hastening the El Niño to La Niña transition.

収録刊行物

• 気象集誌. 第2輯

  気象集誌. 第2輯 85 (3), 335-348, 2007

  公益社団法人 日本気象学会

キーワード

• Atmospheric Science

詳細情報

• CRID: 1390282681479882752
• NII論文ID: 110006318050
• NII書誌ID: AA00702524
• DOI: 10.2151/jmsj.85.335
• ISSN: 21869057
• ISSN: 00261165
• NDL書誌ID: 8781491
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8781491
• Web Site: http://www.jstage.jst.go.jp/article/jmsj/85/3/85_3_335/_pdf
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10612832
• 本文言語コード: en
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