Seasonal-to-Interannual Time-Scale Dynamics of the Equatorial Undercurrent in the Indian Ocean
Chen, Gengxin; Han, Weiqing; Li, Yuanlong; Wang, Dongxiao; McPhaden, Michael J.; dxwang@scsio.ac.cn
2015
发表期刊JOURNAL OF PHYSICAL OCEANOGRAPHY
卷号45期号:6页码:1532-1553
文章类型0022-3670
摘要This paper investigates the structure and dynamics of the Equatorial Undercurrent (EUC) of the Indian Ocean by analyzing in situ observations and reanalysis data and performing ocean model experiments using an ocean general circulation model and a linear continuously stratified ocean model. The results show that the EUC regularly occurs in each boreal winter and spring, particularly during February and April, consistent with existing studies. The EUC generally has a core depth near the 20 degrees C isotherm and can be present across the equatorial basin. The EUC reappears during summer-fall of most years, with core depth located at different longitudes and depths. In the western basin, the EUC results primarily from equatorial Kelvin and Rossby waves directly forced by equatorial easterly winds. In the central and eastern basin, however, reflected Rossby waves from the eastern boundary play a crucial role. While the first two baroclinic modes make the largest contribution, intermediate modes 3-8 are also important. The summer-fall EUC tends to occur in the western basin but exhibits obvious interannual variability in the eastern basin. During positive Indian Ocean dipole (IOD) years, the eastern basin EUC results largely from Rossby waves reflected from the eastern boundary, with directly forced Kelvin and Rossby waves also having significant contributions. However, the eastern basin EUC disappears during negative IOD and normal years because westerly wind anomalies force a westward pressure gradient force and thus westward subsurface current, which cancels the eastward subsurface flow induced by eastern boundary-reflected Rossby waves. Interannual variability of zonal equatorial wind that drives the EUC variability is dominated by the zonal sea surface temperature (SST) gradients associated with IOD and is much less influenced by equatorial wind associated with Indian monsoon rainfall strength.
部门归属[Chen, Gengxin; Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Han, Weiqing; Li, Yuanlong] Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA; [McPhaden, Michael J.] NOAA, Pacific Marine Environm Lab, Seattle, WA 98115 USA ; LTO
关键词Circulation Dynamics Dynamics Kelvin Waves Ocean Circulation Ocean Dynamics Rossby Waves
学科领域Oceanography
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15082
专题热带海洋环境国家重点实验室(LTO)
通讯作者dxwang@scsio.ac.cn
推荐引用方式
GB/T 7714
Chen, Gengxin,Han, Weiqing,Li, Yuanlong,et al. Seasonal-to-Interannual Time-Scale Dynamics of the Equatorial Undercurrent in the Indian Ocean[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2015,45(6):1532-1553.
APA Chen, Gengxin,Han, Weiqing,Li, Yuanlong,Wang, Dongxiao,McPhaden, Michael J.,&dxwang@scsio.ac.cn.(2015).Seasonal-to-Interannual Time-Scale Dynamics of the Equatorial Undercurrent in the Indian Ocean.JOURNAL OF PHYSICAL OCEANOGRAPHY,45(6),1532-1553.
MLA Chen, Gengxin,et al."Seasonal-to-Interannual Time-Scale Dynamics of the Equatorial Undercurrent in the Indian Ocean".JOURNAL OF PHYSICAL OCEANOGRAPHY 45.6(2015):1532-1553.
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