DOI: 10.1007/s00382-012-1427-8
Scopus记录号: 2-s2.0-84879554554
论文题名: A new paradigm for the predominance of standing Central Pacific Warming after the late 1990s
作者: Xiang B. ; Wang B. ; Li T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2 起始页码: 327
结束页码: 340
语种: 英语
英文关键词: Central Pacific Warming
; Convection
; La Niña-like mean state change
; Low-level convergence feedback
英文摘要: Canonical El Niño has a warming center in the eastern Pacific (EP), but in recent decades, El Niño warming center tends to occur more frequently in the central Pacific (CP). The definitions and names of this new type of El Niño, however, have been notoriously diverse, which makes it difficult to understand why the warming center shifts. Here, we show that the new type of El Niño events is characterized by: 1) the maximum warming standing and persisting in the CP and 2) the warming extending to the EP only briefly during its peak phase. For this reason, we refer to it as standing CP warming (CPW). Global warming has been blamed for the westward shift of maximum warming as well as more frequent occurrence of CPW. However, we find that since the late 1990s the standing CPW becomes a dominant mode in the Pacific; meanwhile, the epochal mean trade winds have strengthened and the equatorial thermocline slope has increased, contrary to the global warming-induced weakening trades and flattening thermocline. We propose that the recent predominance of standing CPW arises from a dramatic decadal change characterized by a grand La Niña-like background pattern and strong divergence in the CP atmospheric boundary layer. After the late 1990s, the anomalous mean CP wind divergence tends to weaken the anomalous convection and shift it westward from the underlying SST warming due to the suppressed low-level convergence feedback. This leads to a westward shift of anomalous westerly response and thus a zonally in-phase SST tendency, preventing eastward propagation of the SST anomaly. We anticipate more CPW events will occur in the coming decade provided the grand La Niña-like background state persists. © 2012 Springer-Verlag. 资助项目: ONR, Office of Naval Research
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54870
Appears in Collections: 过去全球变化的重建
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作者单位: International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii, 1680 East-West Rd., Honolulu, HI, 96822, United States; Department of Meteorology, School of Ocean and Earth Science and Technology, University of Hawaii, 2525 Correa Rd., Honolulu, HI, 96822, United States
Recommended Citation:
Xiang B.,Wang B.,Li T.. A new paradigm for the predominance of standing Central Pacific Warming after the late 1990s[J]. Climate Dynamics,2013-01-01,41(2)