DOI: 10.1007/s00382-012-1544-4
Scopus记录号: 2-s2.0-84871919031
论文题名: Real-time multivariate indices for the boreal summer intraseasonal oscillation over the Asian summer monsoon region
作者: Lee J.-Y. ; Wang B. ; Wheeler M.C. ; Fu X. ; Waliser D.E. ; Kang I.-S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-01-02 起始页码: 493
结束页码: 509
语种: 英语
英文关键词: Asian summer monsoon
; Boreal summer intraseasonal oscillation
; Madden-Julian Oscillation
; Monsoon onset
; Northward propagation
; Real-time multivariate index
英文摘要: The boreal summer intraseasonal oscillation (BSISO) of the Asian summer monsoon (ASM) is one of the most prominent sources of short-term climate variability in the global monsoon system. Compared with the related Madden-Julian Oscillation (MJO) it is more complex in nature, with prominent northward propagation and variability extending much further from the equator. In order to facilitate detection, monitoring and prediction of the BSISO we suggest two real-time indices: BSISO1 and BSISO2, based on multivariate empirical orthogonal function (MV-EOF) analysis of daily anomalies of outgoing longwave radiation (OLR) and zonal wind at 850 hPa (U850) in the region 10°S-40°N, 40°-160°E, for the extended boreal summer (May-October) season over the 30-year period 1981-2010. BSISO1 is defined by the first two principal components (PCs) of the MV-EOF analysis, which together represent the canonical northward propagating variability that often occurs in conjunction with the eastward MJO with quasi-oscillating periods of 30-60 days. BSISO2 is defined by the third and fourth PCs, which together mainly capture the northward/northwestward propagating variability with periods of 10-30 days during primarily the pre-monsoon and monsoon-onset season. The BSISO1 circulation cells are more Rossby wave like with a northwest to southeast slope, whereas the circulation associated with BSISO2 is more elongated and front-like with a southwest to northeast slope. BSISO2 is shown to modulate the timing of the onset of Indian and South China Sea monsoons. Together, the two BSISO indices are capable of describing a large fraction of the total intraseasonal variability in the ASM region, and better represent the northward and northwestward propagation than the real-time multivariate MJO (RMM) index of Wheeler and Hendon. © 2012 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55053
Appears in Collections: 过去全球变化的重建
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作者单位: International Pacific Research Center, University of Hawaii, POST Bldg, 409A, 1680 East-West Road, Honolulu, HI, 96822, United States; Centre for Australia Weather and Climate Research (CAWCR), Bureau of Meteorology, Melbourne, Australia; JIFRESSE, University of California, Los Angeles, United States; Jet Propulsion Laboratory, Caltech, Pasadena, United States; Seoul National University, Seoul, South Korea; Department of Meteorology, University of Hawaii, Honolulu, HI, United States
Recommended Citation:
Lee J.-Y.,Wang B.,Wheeler M.C.,et al. Real-time multivariate indices for the boreal summer intraseasonal oscillation over the Asian summer monsoon region[J]. Climate Dynamics,2013-01-01,40(2017-01-02)