DOI: 10.1007/s00382-013-1666-3
Scopus记录号: 2-s2.0-84894931001
论文题名: Epochal changes in the seasonal evolution of tropical Indian Ocean warming associated with El Niño
作者: Chakravorty S. ; Chowdary J.S. ; Gnanaseelan C.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-03-04 起始页码: 805
结束页码: 822
语种: 英语
英文关键词: Climate shift
; ENSO
; Indian Ocean Dipole
; Rossby waves
; Thermocline-SST coupling
; Tropical Indian Ocean
英文摘要: The epochal changes in the seasonal evolution of El Niño induced tropical Indian Ocean (TIO) warming in the context of mid-1970s regime shift is investigated in this study. El Niño induced warming is delayed by one season in the northern TIO during epoch-2 (post mid-1970) and southern TIO during epoch-1 (pre mid-1970). Significant spatiotemporal changes in TIO (especially in the north) warming are apparent during the developing phase of El Niño. The ocean dynamics is the major driver in the basin wide warming during epoch-2 whereas heat fluxes are the dominant processes during epoch-1. Strong coupling between thermocline and sea surface temperature (SST) in epoch-2 indicates that El Niño induced oceanic changes are very significant in the seasonal evolution of basin-wide warming. The thermocline-SST coupling is strengthened by the upward propagating subsurface warming in epoch-2. The westward propagating barrier layer over southern TIO supports persistence of warm SST (over southwest TIO in epoch-2), which in turn induce spring asymmetric mode in winds and precipitation. The asymmetric wind pattern and persistent subsidence over maritime continent are primarily responsible for stronger spring warming in epoch-2. The strong east equatorial Indian Ocean cooling in epoch-2 is mainly driven by coastal upwelling over Java-Sumatra coast, whereas in epoch-1 the weak cooling is controlled by the latent heat flux. The spatiotemporal changes in TIO SST warming and their evolution have strong impact on atmospheric circulation and rainfall distribution over the Indian Oceanic rim through local air-sea interaction. © 2013 Springer-Verlag Berlin Heidelberg. 资助项目: CSIR, Council for Scientific and Industrial Research
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54302
Appears in Collections: 过去全球变化的重建
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作者单位: Indian Institute of Tropical Meteorology, Pune, 411008, India
Recommended Citation:
Chakravorty S.,Chowdary J.S.,Gnanaseelan C.. Epochal changes in the seasonal evolution of tropical Indian Ocean warming associated with El Niño[J]. Climate Dynamics,2014-01-01,42(2017-03-04)