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DOI10.1007/s00382-016-3387-x
Indian Ocean and Indian summer monsoon: relationships without ENSO in ocean-atmosphere coupled simulations
Cretat, Julien1; Terray, Pascal1,2; Masson, Sebastien1; Sooraj, K. P.3; Roxy, Mathew Koll3
2017-08-01
发表期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2017
卷号49期号:4
文章类型Article
语种英语
国家France; India
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 Nino 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.


英文关键词Coupled climate model El Nino-Southern Oscillation Indian Ocean (Dipole) Indian summer monsoon Ocean-atmosphere interactions Rainfall
领域气候变化
收录类别SCI-E
WOS记录号WOS:000407247200017
WOS关键词SEA-SURFACE TEMPERATURE ; TROPOSPHERIC BIENNIAL OSCILLATION ; INTERANNUAL VARIABILITY ; DIPOLE MODE ; EL-NINO ; SENSITIVITY EXPERIMENTS ; EQUATORIAL PACIFIC ; ARABIAN SEA ; ZONAL MODE ; RAINFALL
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/35254
专题气候变化
作者单位1.Univ Paris 06, Sorbonne Univ UPMC, CNRS IRD MNHN, LOCEAN Lab,IPSL, Paris, France;
2.IITM, IISc NIO IITM IRD Joint Int Lab, Indo French Cell Water Sci, Pune, Maharashtra, India;
3.Indian Inst Trop Meteorol, Ctr Climate Change Res, Pune, Maharashtra, India
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Cretat, Julien,Terray, Pascal,Masson, Sebastien,et al. Indian Ocean and Indian summer monsoon: relationships without ENSO in ocean-atmosphere coupled simulations[J]. CLIMATE DYNAMICS,2017,49(4).
APA Cretat, Julien,Terray, Pascal,Masson, Sebastien,Sooraj, K. P.,&Roxy, Mathew Koll.(2017).Indian Ocean and Indian summer monsoon: relationships without ENSO in ocean-atmosphere coupled simulations.CLIMATE DYNAMICS,49(4).
MLA Cretat, Julien,et al."Indian Ocean and Indian summer monsoon: relationships without ENSO in ocean-atmosphere coupled simulations".CLIMATE DYNAMICS 49.4(2017).
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