DOI: | 10.1007/s00382-013-1792-y
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Scopus记录号: | 2-s2.0-84902000442
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论文题名: | The importance of the eastward zonal current for generating extreme El Niño |
作者: | Kim W.M.; Cai W.
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刊名: | Climate Dynamics
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ISSN: | 9307575
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出版年: | 2014
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卷: | 42, 期:2017-11-12 | 起始页码: | 3005
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结束页码: | 3014
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语种: | 英语
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英文关键词: | Asymmetry
; ENSO
; Equatorial zonal current
; Skewness
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英文摘要: | Extreme El Niño (e.g., 1983/1983 and 1997/1998) causes severe weather and climate impacts globally, but the associated dynamics is not fully understood. The present study shows that advection of mean temperature by anomalous eastward zonal current plays an important role in producing such extreme events especially during the early part of the developing period. While the climatological direction of the upper oceanic current in the equatorial Pacific is westward, at times the direction reverses. These eastward current events are well distinguished from the normal, westward conditions. The upper-layer zonal current in the equatorial Pacific is basically in geostrophic balance and forced by wind stress. However, in the case of the eastward zonal current events, persistent westerly winds are observed in the Western Pacific, and the current becomes synchronized with the westerly wind stress above. The advection of the mean temperature by the anomalous zonal current in the early developing period always precedes strong El Niño, though it does not significantly contribute to the growth of La Niña, neutral, and moderate El Niño; and is the major contributor of asymmetry in the early developing phase. © 2013 Springer-Verlag Berlin Heidelberg. |
Citation statistics: |
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资源类型: | 期刊论文
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标识符: | http://119.78.100.158/handle/2HF3EXSE/54592
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Appears in Collections: | 过去全球变化的重建
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作者单位: | CSIRO Marine and Atmospheric Research, Aspendale, VIC, Australia
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Recommended Citation: |
Kim W.M.,Cai W.. The importance of the eastward zonal current for generating extreme El Niño[J]. Climate Dynamics,2014-01-01,42(2017-11-12)
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