DOI: 10.1002/joc.5228
论文题名: The interannual sea level variability in the Indian ocean as simulated by an ocean general circulation model
作者: Deepa J.S. ; Gnanaseelan C. ; Kakatkar R. ; Parekh A. ; Chowdary J.S.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 3 起始页码: 1132
结束页码: 1144
语种: 英语
英文关键词: El Niño
; Indian Ocean Dipole
; OGCM
; Sea level variability
Scopus关键词: Glacial geology
; Rain
; Tide gages
; Wind stress
; Equatorial Indian Ocean
; Indian Ocean dipole
; Indonesian throughflow
; Interannual variability
; Ocean general circulation models
; OGCM
; Sea level variability
; Southern indian ocean
; Sea level
; altimeter
; annual variation
; El Nino
; El Nino-Southern Oscillation
; general circulation model
; Indian Ocean Dipole
; sea level change
; tide gauge
; wind stress
; Indian Ocean
; Pacific Ocean
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 Niño events co-occur) contribute significantly towards the interannual variability in the Indian Ocean compared to pure IOD or El Niño events, and are characterized by persistent generation of open ocean downwelling, with maximum signals in the 10° to 5°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 Niño 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. © 2017 Royal Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117129
Appears in Collections: 气候减缓与适应
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作者单位: Climate Variability and Data Assimilation Research, Indian Institute of Tropical Meteorology, Pune, India; Savitribai Phule Pune University, Pune, India
Recommended Citation:
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,2018-01-01,38(3)