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Dynamics of Eddy Generation in the Central Bay of Bengal
Cheng, Xuhua1; McCreary, Julian P.; Qiu, Bo3; Qi, Yiquan; Du, Yan4; Chen, Xiao
AbstractEddy activity in the central Bay of Bengal (BoB) is revealed using satellite observations and hydrographic data. Altimetric data show that eddies are generated near the eastern boundary, propagate southwestward, and have periods predominantly in the 30- to 120-day band. Temperature profiles from the Research Moored Array for African-Asian-Australian Monsoon Analysis and Prediction (RAMA) buoy at 90 degrees E, 15 degrees N, have their highest amplitude in the depth range of the thermocline, indicating that the eddies are associated with a vertical motion of the thermocline (a first-baroclinic-mode response). To investigate the cause of the eddies, we obtained a suite of solutions to nonlinear and linear versions of a 11/2-layer (reduced-gravity) model. They demonstrate that equatorial wind forcing, Myanmar bump and Andaman Island, and nonlinearity are all essential for eddy formation. Among the nonlinear terms, the advection terms are the primary cause. This study combines observations and model to understand eddy generation in the central Bay of Bengal. When equatorial wind-driven downwelling (upwelling) Kelvin waves propagate to the tip of the Irrawaddy Delta off Myanmar, anticyclonic (cyclonic) eddies are generated there that subsequently propagate southwestward. The eddies are mainly driven by equatorial zonal winds, with both nonlinearity and coastline geometry essential for eddy generation.
KeywordBay of Bengal mesoscale eddy reduced-gravity model
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Hohai Univ, Coll Oceanog, Nanjing, Jiangsu, Peoples R China
2.Hohai Univ, Minist Educ, Key Lab Coastal Disaster & Def, Nanjing, Jiangsu, Peoples R China
3.Cheng, Xuhua; McCreary, Julian P.] Univ Hawaii Manoa, Int Pacific Res Ctr, Honolulu, HI 96822 USA
4.Univ Hawaii Manoa, Dept Oceanog, Honolulu, HI 96822 USA
5.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Cheng, Xuhua,McCreary, Julian P.,Qiu, Bo,et al. Dynamics of Eddy Generation in the Central Bay of Bengal[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2018,123(9):6861, 6875.
APA Cheng, Xuhua,McCreary, Julian P.,Qiu, Bo,Qi, Yiquan,Du, Yan,&Chen, Xiao.(2018).Dynamics of Eddy Generation in the Central Bay of Bengal.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,123(9),6861.
MLA Cheng, Xuhua,et al."Dynamics of Eddy Generation in the Central Bay of Bengal".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 123.9(2018):6861.
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