Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-017-3956-7 |
Intrinsic precursors and timescale of the tropical Indian Ocean Dipole: insights from partially decoupled numerical experiment | |
Cretat, Julien1; Terray, Pascal1,2; Masson, Sebastien1; Sooraj, K. P.3 | |
2018-08-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 51期号:4页码:1311-1332 |
文章类型 | Article |
语种 | 英语 |
国家 | France; India |
英文摘要 | The intrinsic precursors and timescale of the tropical Indian Ocean Dipole (IOD) are examined with the help of a partially coupled global experiment with decoupled SST over the tropical Pacific. The IOD does exist in the absence of sea surface temperature interannual variability in the tropical Pacific in our modeling framework, but has weaker amplitude and damped Bjerknes feedback. However, IOD variability is much more biennial in the absence than presence of El Nio Southern Oscillation, especially in the eastern equatorial Indian Ocean (IO). Such biennial rhythm results mainly from two mechanisms internal to the IO. The tropical ocean dynamics play a key role in the biennial anomalies during boreal winter with a sudden reversal of thermocline anomalies in the eastern equatorial IO forced by intraseasonal disturbances reminiscent of the Madden-Julian Oscillation (MJO). However, this preconditioning is not sufficient for triggering IOD events in the next boreal spring per se. The main trigger for pure IODs relates to tropical-extratropical interactions within the IO. Convection and diabating heating associated with negative IODs promote a Gill-type tropical response, excite mid-latitude wave-trains and subtropical blocking in the Southern Hemisphere that trigger positive subtropical IOD events during boreal winter. The latter promotes cold SST and anticyclonic circulation anomalies over the southeast IO that persist and migrate northeastward, triggering positive IOD events during the next boreal spring. Accounting for the complementary influence of tropical ocean dynamics coupled to MJO and tropical-extratropical ocean-atmosphere interactions may thus help improving IOD predictability. |
英文关键词 | Biennial variability Coupled climate model Indian Ocean Dipole MJO Ocean dynamics Tropical-extratropical interactions |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439440200003 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; GENERAL-CIRCULATION MODEL ; EL-NINO ; INTERANNUAL VARIABILITY ; CLIMATE VARIABILITY ; LEVEL VARIATIONS ; COUPLED MODEL ; SHORT RAINS ; ZONAL MODE ; ENSO |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36160 |
专题 | 气候变化 |
作者单位 | 1.Univ Paris 06, Sorbonne Univ, LOCEAN Lab, UPMC,CNRS,IRD,MNHN, Paris, France; 2.IITM, Indo French Cell Water Sci, IISc, NIO,IRD Joint Int Lab, Pune, Maharashtra, India; 3.Indian Inst Trop Meteorol, Ctr Climate Change Res, Pune, Maharashtra, India |
推荐引用方式 GB/T 7714 | Cretat, Julien,Terray, Pascal,Masson, Sebastien,et al. Intrinsic precursors and timescale of the tropical Indian Ocean Dipole: insights from partially decoupled numerical experiment[J]. CLIMATE DYNAMICS,2018,51(4):1311-1332. |
APA | Cretat, Julien,Terray, Pascal,Masson, Sebastien,&Sooraj, K. P..(2018).Intrinsic precursors and timescale of the tropical Indian Ocean Dipole: insights from partially decoupled numerical experiment.CLIMATE DYNAMICS,51(4),1311-1332. |
MLA | Cretat, Julien,et al."Intrinsic precursors and timescale of the tropical Indian Ocean Dipole: insights from partially decoupled numerical experiment".CLIMATE DYNAMICS 51.4(2018):1311-1332. |
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