DOI: 10.1007/s00382-013-2026-z
Scopus记录号: 2-s2.0-84891289509
论文题名: Cause of severe droughts in Southwest China during 1951–2010
作者: Feng L. ; Li T. ; Yu W.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 2017-07-08 起始页码: 2033
结束页码: 2042
语种: 英语
英文关键词: Drought
; North Atlantic Oscillation
; Rainfall
; Southwest China
; The tropical Pacific
英文摘要: The cause of severe droughts over the Southwest China (SWC) during the local dry season is investigated based on the station rainfall data and the National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis data during 1951–2010. The droughts are in general consistent with local anomalous descent in the middle troposphere. The diagnosis of the vertical motion (omega) equation indicates that the local descent is primarily maintained by the anomalous cold temperature advection processes. Both the advection of anomalous temperature by mean wind and the advection of mean temperature by anomalous wind contribute to maintaining the anomalous descent over the SWC region. A composite analysis shows that the circulation anomaly over SWC is induced by remote forcing from the tropical Pacific and North Atlantic Oceans. During La Niña years, enhanced heating over the Maritime Continent induces anomalous downward motion over SWC through the connection of local Hadley circulation. Adiabatic warming associated with the downward motion helps to set up and maintain the local anomalous anticyclone. Another possible route is through the North Atlantic-Asia teleconnection, in which downstream Rossby wave energy propagation plays a crucial role. A negative-phase North Atlantic Oscillation may trigger a large-scale wave train pattern that induces an anomalous anticyclone over the subtropical Asia and promotes the dry condition over SWC. © 2013, Springer-Verlag Berlin Heidelberg. 资助项目: MOST, Ministry of Science and Technology of the People's Republic of China
; NSF, National Science Foundation
; NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
; NSF, National Science Foundation
; 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/54415
Appears in Collections: 过去全球变化的重建
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作者单位: Center for Ocean and Climate Research, The First Institute of Oceanography, State Oceanic Administration, Qingdao, China; International Pacific Research Center and Department of Meteorology, University of Hawaii, Honolulu, HI, United States
Recommended Citation:
Feng L.,Li T.,Yu W.. Cause of severe droughts in Southwest China during 1951–2010[J]. Climate Dynamics,2014-01-01,43(2017-07-08)