GSTDTAP  > 气候变化
DOI10.1002/joc.5228
The interannual sea level variability in the Indian Ocean as simulated by an Ocean General Circulation Model
Deepa, J. S.1,2; Gnanaseelan, C.1; Kakatkar, R.1,2; Parekh, A.1; Chowdary, J. S.1
2018-03-15
发表期刊INTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN0899-8418
EISSN1097-0088
出版年2018
卷号38期号:3页码:1132-1144
文章类型Article
语种英语
国家India
英文摘要

Limited coverage of tide gauge observations and limited length record of altimeter observations remain inadequate for the Indian Ocean sea level variability studies especially for longer periods. This study takes advantage of Ocean General Circulation Model (OGCM) simulations and ocean reanalysis to explore the interannual variability of sea level in the Indian Ocean. The model simulated sea level anomalies display good correlation with altimetry and reanalysis products. This consistency in model simulations with observations and reanalysis highlights the potential use of this OGCM in understanding the sea level variability. Analysis reveals that co-occurrence years (years when Indian Ocean Dipole (IOD) and El Nino events co-occur) contribute significantly towards the interannual variability in the Indian Ocean compared to pure IOD or El Nino events, and are characterized by persistent generation of open ocean downwelling, with maximum signals in the 10 degrees to 5 degrees S region. The OGCM experiments are carried out by modulating the forcing fields over the Pacific and the Indian Ocean to understand the physical mechanisms causing sea level variability. The experiments suggest that the remote forcing from the Pacific Ocean via Indonesian ThroughFlow (ITF) induce significant sea level changes in the southern Indian Ocean only with variability mostly in the decadal time scales and the northern and equatorial Indian Ocean are not affected by ITF. This study also shows that El Nino and IOD-induced variations in zonal wind stress and wind stress curl mainly contribute the interannual sea level variations in the Indian Ocean. The forcing associated with the co-occurrence years are multi-phased with coastal and open ocean forcing. Whereas the pure IOD and El Nino forcing is mainly found only over the open ocean. The decadal variability in the ENSO is primarily responsible for the decadal sea level variability in the Indian Ocean by modulating ITF transport.


英文关键词sea level variability El Nino Indian Ocean Dipole OGCM
领域气候变化
收录类别SCI-E
WOS记录号WOS:000426729300003
WOS关键词EL-NINO ; ROSSBY WAVES ; RISE TRENDS ; DIPOLE ; COASTS ; SST
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/37118
专题气候变化
作者单位1.Indian Inst Trop Meteorol, Climate Variabil & Data Assimilat Res, Pune 411008, Maharashtra, India;
2.Savitribai Phule Pune Univ, Pune, Maharashtra, India
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Deepa, J. S.,Gnanaseelan, C.,Kakatkar, R.,et al. The interannual sea level variability in the Indian Ocean as simulated by an Ocean General Circulation Model[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2018,38(3):1132-1144.
APA Deepa, J. S.,Gnanaseelan, C.,Kakatkar, R.,Parekh, A.,&Chowdary, J. S..(2018).The interannual sea level variability in the Indian Ocean as simulated by an Ocean General Circulation Model.INTERNATIONAL JOURNAL OF CLIMATOLOGY,38(3),1132-1144.
MLA Deepa, J. S.,et al."The interannual sea level variability in the Indian Ocean as simulated by an Ocean General Circulation Model".INTERNATIONAL JOURNAL OF CLIMATOLOGY 38.3(2018):1132-1144.
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