Origins of Eddy Kinetic Energy in the Bay of Bengal

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Origins of Eddy Kinetic Energy in the Bay of Bengal
	Chen, GX; Li, YL; Xie, Q; Wang, DX
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2018
卷号	123 期号:3 页码:2097-2115
关键词	eddy kinetic energy ocean internal instability remote equatorial wind local wind Bay of Bengal
通讯作者	dxwang@scsio.ac.cn
英文摘要	By analyzing satellite observational data and ocean general circulation model experiments, this study investigates the key processes that determine the spatial distribution and seasonality of intraseasonal eddy kinetic energy (EKE) within the Bay of Bengal (BOB). It is revealed that a complicated mechanism involving both local and remote wind forcing and ocean internal instability is responsible for the generation and modulation of EKE in this region. High-level EKE mainly resides in four regions: east of Sri Lanka (Region 1), the western BOB (Region 2), northwest of Sumatra (Region 3), and the coastal rim of the BOB (Region 4). The high EKE levels in Regions 1 and 2 are predominantly produced by ocean internal instability, which contributes 90% and 79%, respectively. Prominent seasonality is also observed in these two regions, with higher EKE levels in boreal spring and fall due to enhanced instability of the East Indian Coast Current and the Southwest Monsoon Current, respectively. In contrast, ocean internal instability contributes 49% and 52% of the total EKE in Regions 3 and 4, respectively, whereas the atmospheric forcing of intraseasonal oscillations (ISOs) also plays an important role. ISOs produce EKE mainly through wind stress, involving both the remote effect of equatorial winds and the local effect of monsoonal winds. Equatorial-origin wave signals significantly enhance the EKE levels in Regions 3 and 4, in the form of reflected Rossby waves and coastal Kelvin waves, respectively. The local wind forcing effect through Ekman pumping also has a significant contribution in Regions 3 and 4 (24% and 22%, respectively).
学科主题	Oceanography
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17089]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Chen, GX,Li, YL,Xie, Q,et al. Origins of Eddy Kinetic Energy in the Bay of Bengal[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2018,123(3):2097-2115.
APA	Chen, GX,Li, YL,Xie, Q,&Wang, DX.(2018).Origins of Eddy Kinetic Energy in the Bay of Bengal.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,123(3),2097-2115.
MLA	Chen, GX,et al."Origins of Eddy Kinetic Energy in the Bay of Bengal".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 123.3(2018):2097-2115.