GSTDTAP  > 气候变化
DOI10.1007/s00382-019-04885-z
Natural decadal sea-level variability in the Indian Ocean: lessons from CMIP models
Nidheesh, A. G.1,2; Lengaigne, Matthieu2,3; Vialard, Jerome2; Izumo, Takeshi2,3; Unnikrishnan, A. S.4; Krishnan, R.1
2019-11-01
发表期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2019
卷号53页码:5653-5673
文章类型Article
语种英语
国家India; France
英文摘要

Indian Ocean decadal sea-level variability is an active research area, with many unresolved questions due to inadequate observational coverage. In this study, we analyse 26 Coupled Model Intercomparison Project (CMIP) pre-industrial simulations and isolate two consistent modes of Indian Ocean variability, which collectively explain about 50% of the total decadal sea-level variance. With opposite sea-level signals in the southwestern and eastern Indian Ocean, the first mode is related to decadal modulation of the Indian Ocean Dipole (DIOD) and equatorial wind-driven dynamics. Though IOD is more independent of the El Nino-Southern Oscillation (ENSO) at decadal (r similar to 0.4) than interannual (r similar to 0.6) timescales, the DIOD-ENSO co-variability yields sea-level signals along the west coast of Australia, transmitted from the western Pacific via the Indonesian Throughflow. The second mode encompasses variability in the south Indian Ocean (SIODV), exhibiting a broad monopolar sea-level pattern east of Madagascar. In about half of the models, the SIODV is largely independent from DIOD (and decadal ENSO) and driven by south Indian Ocean wind-stress curl associated with meridional shifts in the Mascarene High (MH). In the other models, the SIODV lags the DIOD about 3 years. In those models, in addition to MH forcing, the DIOD-related alongshore wind stress off the northwest Australian coast triggers Rossby waves that also contribute to the SIODV, further west. The DIOD and MH forcing are mutually independent (r similar to 0.2). The results are broadly consistent with sea-level variations derived from the short altimeter data, despite an underestimation of the Oceanic bridge signals in CMIP models.


英文关键词Natural decadal climate variability Sea level Indian Ocean Indian Ocean Dipole (IOD) El Nino Southern Oscillation (ENSO) CMIP
领域气候变化
收录类别SCI-E
WOS记录号WOS:000493469900029
WOS关键词WESTERN TROPICAL PACIFIC ; INTERNAL VARIABILITY ; HEAT-CONTENT ; ENSO ; INTENSIFICATION ; OSCILLATION ; DYNAMICS ; PATTERNS ; IMPACTS ; DIPOLE
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/187917
专题气候变化
作者单位1.Indian Inst Trop Meteorol, Ctr Climate Change Res, Pune 401008, Maharashtra, India;
2.Univ Paris 06, UPMC, Sorbonne Univ, CNRS,IRD,MNHN,IPSL,LOCEAN Lab, Paris, France;
3.NIO, IISc NIO IITM IRD Joint Int Lab, Indo French Cell Water Sci, Panaji, Goa, India;
4.CSIR, Natl Inst Oceanog, Panaji, Goa, India
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Nidheesh, A. G.,Lengaigne, Matthieu,Vialard, Jerome,et al. Natural decadal sea-level variability in the Indian Ocean: lessons from CMIP models[J]. CLIMATE DYNAMICS,2019,53:5653-5673.
APA Nidheesh, A. G.,Lengaigne, Matthieu,Vialard, Jerome,Izumo, Takeshi,Unnikrishnan, A. S.,&Krishnan, R..(2019).Natural decadal sea-level variability in the Indian Ocean: lessons from CMIP models.CLIMATE DYNAMICS,53,5653-5673.
MLA Nidheesh, A. G.,et al."Natural decadal sea-level variability in the Indian Ocean: lessons from CMIP models".CLIMATE DYNAMICS 53(2019):5653-5673.
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