DOI: 10.1007/s00382-016-3387-x
Scopus记录号: 2-s2.0-84991054894
论文题名: Indian Ocean and Indian summer monsoon: relationships without ENSO in ocean–atmosphere coupled simulations
作者: Crétat J. ; Terray P. ; Masson S. ; Sooraj K.P. ; Roxy M.K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 4 起始页码: 1429
结束页码: 1448
语种: 英语
英文关键词: Coupled climate model
; El Niño-Southern Oscillation
; Indian Ocean (Dipole)
; Indian summer monsoon
; Ocean–atmosphere interactions
; Rainfall
英文摘要: The relationship between the Indian Ocean and the Indian summer monsoon (ISM) and their respective influence over the Indo-Western North Pacific (WNP) region are examined in the absence of El Niño Southern Oscillation (ENSO) in two partially decoupled global experiments. ENSO is removed by nudging the tropical Pacific simulated sea surface temperature (SST) toward SST climatology from either observations or a fully coupled control run. The control reasonably captures the observed relationships between ENSO, ISM and the Indian Ocean Dipole (IOD). Despite weaker amplitude, IODs do exist in the absence of ENSO and are triggered by a boreal spring ocean–atmosphere coupled mode over the South-East Indian Ocean similar to that found in the presence of ENSO. These pure IODs significantly affect the tropical Indian Ocean throughout boreal summer, inducing a significant modulation of both the local Walker and Hadley cells. This meridional circulation is masked in the presence of ENSO. However, these pure IODs do not significantly influence the Indian subcontinent rainfall despite overestimated SST variability in the eastern equatorial Indian Ocean compared to observations. On the other hand, they promote a late summer cross-equatorial quadrupole rainfall pattern linking the tropical Indian Ocean with the WNP, inducing important zonal shifts of the Walker circulation despite the absence of ENSO. Surprisingly, the interannual ISM rainfall variability is barely modified and the Indian Ocean does not force the monsoon circulation when ENSO is removed. On the contrary, the monsoon circulation significantly forces the Arabian Sea and Bay of Bengal SSTs, while its connection with the western tropical Indian Ocean is clearly driven by ENSO in our numerical framework. Convection and diabatic heating associated with above-normal ISM induce a strong response over the WNP, even in the absence of ENSO, favoring moisture convergence over India. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53109
Appears in Collections: 过去全球变化的重建
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作者单位: Sorbonne Universités (UPMC, Univ Paris 06)-CNRS-IRD-MNHN, LOCEAN Laboratory, IPSL, Paris, France; Indo-French Cell for Water Sciences, IISc-NIO-IITM–IRD Joint International Laboratory, IITM, Pune, India; Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India
Recommended Citation:
Crétat J.,Terray P.,Masson S.,et al. Indian Ocean and Indian summer monsoon: relationships without ENSO in ocean–atmosphere coupled simulations[J]. Climate Dynamics,2017-01-01,49(4)