DOI: 10.1007/s00382-013-1856-z
Scopus记录号: 2-s2.0-84899962768
论文题名: Influence of PDO on South Asian summer monsoon and monsoon-ENSO relation
作者: Krishnamurthy L. ; Krishnamurthy V.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-09-10 起始页码: 2397
结束页码: 2410
语种: 英语
英文关键词: CCSM4
; ENSO
; Indian monsoon
; Monsoon circulation
; PDO
英文摘要: This study has investigated the possible relation between the Indian summer monsoon and the Pacific Decadal Oscillation (PDO) observed in the sea surface temperature (SST) of the North Pacific Ocean. Using long records of observations and coupled model (NCAR CCSM4) simulation, this study has found that the warm (cold) phase of the PDO is associated with deficit (excess) rainfall over India. The PDO extends its influence to the tropical Pacific and modifies the relation between the monsoon rainfall and El Niño-Southern Oscillation (ENSO). During the warm PDO period, the impact of El Niño (La Niña) on the monsoon rainfall is enhanced (reduced). A hypothesis put forward for the mechanism by which PDO affects the monsoon starts with the seasonal footprinting of SST from the North Pacific to the subtropical Pacific. This condition affects the trade winds, and either strengthens or weakens the Walker circulation over the Pacific and Indian Oceans depending on the phase of the PDO. The associated Hadley circulation in the monsoon region determines the impact of PDO on the monsoon rainfall. We suggest that knowing the phase of PDO may lead to better long-term prediction of the seasonal monsoon rainfall and the impact of ENSO on monsoon. © 2013 Springer-Verlag Berlin Heidelberg. 资助项目: NSF, George Mason University
; NSF, George Mason University
; NOAA, George Mason University
; NASA, George Mason University
; NCAR, George Mason University
; George Mason University
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54348
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Atmospheric, Oceanic and Earth Sciences, George Mason University, Fairfax, VA, United States; Center for Ocean-Land-Atmosphere Studies, Institute of Global Environment and Society, Calverton, MD, United States
Recommended Citation:
Krishnamurthy L.,Krishnamurthy V.. Influence of PDO on South Asian summer monsoon and monsoon-ENSO relation[J]. Climate Dynamics,2014-01-01,42(2017-09-10)