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Origins of Eddy Kinetic Energy in the Bay of Bengal
Chen, Gengxin1; Li, Yuanlong2,3; Xie, Qiang1,4; Wang, Dongxiao1
AbstractBy 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).
Keywordeddy kinetic energy ocean internal instability remote equatorial wind local wind Bay of Bengal
Funding ProjectNSFC[41476011] ; NSFC[41776001] ; NSFC[41676010] ; NSFC[41521005] ; State Key Laboratory of Tropical Oceanography SCSIO[LTOZZ1702] ; Youth Innovation Promotion Association CAS[2017397] ; Guangzhou Science and Technology Foundation[201804010133]
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000430918500030
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Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorWang, Dongxiao
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China
4.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Chen, Gengxin,Li, Yuanlong,Xie, Qiang,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, Gengxin,Li, Yuanlong,Xie, Qiang,&Wang, Dongxiao.(2018).Origins of Eddy Kinetic Energy in the Bay of Bengal.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,123(3),2097-2115.
MLA Chen, Gengxin,et al."Origins of Eddy Kinetic Energy in the Bay of Bengal".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 123.3(2018):2097-2115.
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