DOI: 10.1007/s00382-017-3965-6
Scopus记录号: 2-s2.0-85033466249
论文题名: Why rainfall response to El Niño over Maritime Continent is weaker and non-uniform in boreal winter than in boreal summer
作者: Jiang L. ; Li T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期: 4 起始页码: 1465
结束页码: 1483
语种: 英语
英文关键词: El Niño
; Maritime Continent
; Rainfall
; Topographic lifting
Scopus关键词: air-sea interaction
; anticyclone
; El Nino
; La Nina
; marine atmosphere
; precipitation intensity
; rainfall
; seasonal variation
; topographic mapping
; Walker circulation
; Indian Ocean
; Indonesia
; Indonesian seas
; Java Sea
; Pacific Ocean
; West Kalimantan
英文摘要: Why rainfall response to El Niño is uniform and stronger over the Maritime Continent (MC) during El Niño developing summer and fall but is weaker and non-uniform during El Niño mature winter is investigated through the diagnosis of anomalous large-scale circulation patterns and a local moisture budget analysis. It is found that when anomalous Walker cells across the equatorial Pacific and Indian Ocean are strengthened toward El Niño mature winter, a low-level ascending motion anomaly starts to develop over western MC in northern fall due to topographic lifting (near Sumatra) and anomalous wind convergence (near west Kalimantan). Easterly anomalies, as a part of an anomalous anticyclone in South China Sea (SCS) that is developed during El Niño and a part of the south-easterly from Java Sea associated with anomalous Walker Circulation, bump into the mountain ridge of Sumatra and induce ascending motion anomalies near Sumatra. Meanwhile, the anomalous north-easterly in the southern flank of the anomalous anticyclone over SCS and south-easterly over Java Sea converge into west Kalimantan, leading to ascending motion there. The anomalous ascending motion tend to advect mean moisture upward to moisten lower troposphere in situ. This low-level moistening eventually sets up a convectively unstable stratification and induces a positive precipitation anomaly in the western MC. How the mechanism discussed here is relevant to previous hypotheses and how processes during El Niño might differ during La Niña are discussed. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109203
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Joint International Research Laboratory of Climate and Environmental Change (ILCEC), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, China; Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu, HI, United States
Recommended Citation:
Jiang L.,Li T.. Why rainfall response to El Niño over Maritime Continent is weaker and non-uniform in boreal winter than in boreal summer[J]. Climate Dynamics,2018-01-01,51(4)