DOI: 10.1007/s00382-014-2303-5
Scopus记录号: 2-s2.0-85027950550
论文题名: The impact of South Pacific extratropical forcing on ENSO and comparisons with the North Pacific
作者: Ding R. ; Li J. ; Tseng Y.-H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-07-08 起始页码: 2017
结束页码: 2034
语种: 英语
英文关键词: ENSO
; Quadrapole SST pattern
; The Pacific–South American (PSA) pattern
英文摘要: Previous studies suggest that North Pacific extratropical atmospheric variability influences ENSO via the seasonal footprinting mechanism (SFM). This study confirms that quadrapole sea surface temperature (SST) variability in the extratropical South Pacific triggered by mid-latitude South Pacific atmospheric variability may also have an additional influence on ENSO. The response of the evolution of the ENSO-related zonal wind and SST anomalies in the tropics to the South Pacific extratropical forcing is consistent with the SFM hypothesis. That is, the Pacific–South American (PSA) pattern of the South Pacific extratropical sea level pressure (SLP) anomalies imparts an SST footprint (i.e., a quadrapole SST pattern) onto the ocean during austral summer. This SST footprint subsequently forces the zonal wind anomalies along the equator in the following austral winter that ultimately result in ENSO events during the following austral summer via ocean–atmosphere coupling in the tropics. The present study demonstrates that the influences of extratropical atmospheric variability in the South Pacific and North Pacific on ENSO are different and relatively independent. It is possible that they may, together or separately, influence the occurrence of ENSO events, and the importance of the South Pacific forcing in initiating ENSO events is comparable with that of the North Pacific forcing. An empirical model was established to predict the Niño3.4 index based on the combined South Pacific and North Pacific signals, and results show that it can be used to produce skillful forecasts of the Niño3.4 index with a leading time of up to 1 year. © 2014, Springer-Verlag Berlin Heidelberg. 资助项目: NSFC, National Natural Science Foundation of China
; CAS, Chinese Academy of Sciences
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54200
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, Beijing, China; College of Global Change and Earth System Science (GCESS), Beijing Normal University, Beijing, China; Joint Center for Global Change Studies, Beijing, China; Climate and Global Dynamics Division, NCAR, Boulder, CO, United States
Recommended Citation:
Ding R.,Li J.,Tseng Y.-H.. The impact of South Pacific extratropical forcing on ENSO and comparisons with the North Pacific[J]. Climate Dynamics,2015-01-01,44(2017-07-08)