DOI: 10.1007/s00382-011-1153-7
Scopus记录号: 2-s2.0-84861797807
论文题名: Intraseasonal oscillations of the monsoon circulation over South Asia
作者: Krishnamurthy V. ; Achuthavarier D.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-11-12 起始页码: 2335
结束页码: 2353
语种: 英语
英文关键词: Intraseasonal oscillation
; Monsoon circulation
; South Asian monsoon
英文摘要: The space-time structure of the three-dimensional circulation over the South Asian monsoon region has been studied using the ERA-40 reanalysis of the European Centre for Medium-Range Weather Forecasts. Applying multi-channel singular spectrum analysis on combined daily values of horizontal winds and pressure vertical velocity at ten vertical levels for the period 1958-2001, two leading intraseasonal nonlinear oscillations were extracted. The first oscillation has an average period of 50 days and propagates northeastward from the Indian Ocean to the Indian subcontinent. The second oscillation has a period of 30 days and propagates northwestward from the West Pacific to the Indian region. Both the oscillations exhibit the oscillatory and propagation features at all vertical levels from 1,000 to 100 hPa. The two oscillations correspond well with similar oscillations found in outgoing longwave radiation and precipitation in earlier studies. The wind oscillations also account for the active and break phases of the Indian monsoon. The vertical structures and propagation of specific humidity and temperature are found to be consistent with those of the winds in each oscillation. The structure and movement of regional Hadley and Walker circulations have also been described. The analyses provide further strong evidence for the existence of two distinct monsoon intraseasonal oscillations. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55285
Appears in Collections: 过去全球变化的重建
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作者单位: Center for Ocean-Land-Atmosphere Studies, Institute of Global Environment and Society, 4041 Powder Mill Road, Suite 302, Calverton, MD 20705, United States; Department of Atmospheric, Oceanic and Earth Sciences, George Mason University, Fairfax, VA, United States
Recommended Citation:
Krishnamurthy V.,Achuthavarier D.. Intraseasonal oscillations of the monsoon circulation over South Asia[J]. Climate Dynamics,2012-01-01,38(2017-11-12)