An Impact of SST Anomalies in the Indian Ocean in Acceleration of the El Nino to La Nina Transition
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- OHBA Masamichi
- Graduate School of Life and Environmental Sciences, University of Tsukuba
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- UEDA Hiroaki
- Graduate School of Life and Environmental Sciences, University of Tsukuba
Bibliographic Information
- Other Title
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- An impact of SST anomalies in the Indian Ocean in acceleration of the El Niño to La Niña transition
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Abstract
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.
Journal
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- Journal of the Meteorological Society of Japan. Ser. II
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Journal of the Meteorological Society of Japan. Ser. II 85 (3), 335-348, 2007
Meteorological Society of Japan
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Details 詳細情報について
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- CRID
- 1390282681479882752
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- NII Article ID
- 110006318050
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- NII Book ID
- AA00702524
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- ISSN
- 21869057
- 00261165
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- NDL BIB ID
- 8781491
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- Abstract License Flag
- Disallowed