A subsurface cyclonic eddy in the Bay of Bengal

Babu, M.T.; PrasannaKumar, S.; Rao, D.P.

doi:10.1357/002224091784995846

Cited by 72 publications

(38 citation statements)

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“…These two opposite eddy-driven flows are southward from the 21°N and northward from 10°N, and both move eastward at 16°N. As shown in earlier studies (Babu et al, 1991;Durand et al, 2009;Shetye et al, 1990Shetye et al, , 1991Sil & Chakraborty, 2011b), various cyclonic and ACEs are found along the western boundary with an intrusion of Arabian Sea water to the south of Sri Lanka (Vinayachandran et al, 1999) through Summer Monsoon Current (SMC). The surface currents during ISM months from OSCAR, AVISO, and Exp1 show that the model is very efficient in replicating the EICC discontinuity ( Figure 2).…”

Section: Design Of Numerical Experimentssupporting

confidence: 50%

Characteristics of the Discontinuity of Western Boundary Current in the Bay of Bengal

et al. 2019

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The western boundary current in the Bay of Bengal, also known as East India Coastal Current, is northward (southward) and continuous during pre‐ (post‐) Indian Summer Monsoon (ISM) but discontinuous during ISM (June–September). This study investigates the features of this discontinuity and role of eddies, local winds, and southern open boundary lateral forcing using AVISO TOPEX Poseidon, ERS, and Jason1 combined sea surface height anomaly, Ocean Surface Current Analysis Real‐time (OSCAR) surface currents and high‐resolution Regional Ocean Modelling System simulations. The study shows that the discontinuity is governed by westward and southwestward propagating eddies between two opposite facing flows along the boundary, northward of 10°N and southward of 21°N. This northward flow of 10°N is wind driven with lateral influence during September. The southward flow of 21°N is influenced by the Summer Monsoon Current, but the local wind influence starts from July onward. During ISM, about 79% cyclonic and 77% anticyclonic eddies move westward, while 68% cyclonic and 69% anticyclonic eddies move southward. Three highly active eddy genesis areas, having more than 50% activities during ISM, are identified: northern and southwestern bay for cyclonic and off Visakhapatnam (17.68°N, 83.21°E) coast for anticyclonic eddies. The pre‐ISM (post‐ISM) is dominated by anticyclonic (cyclonic) eddies, which are found across the western Bay of Bengal and away from northward (southward) East India Coastal Current. The ISM is dominated by westward and southwestward moving both cyclonic and anticyclonic eddies, which are confined to the boundary, where discontinuity is generally observed.

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Section: Design Of Numerical Experimentssupporting

confidence: 50%

Characteristics of the Discontinuity of Western Boundary Current in the Bay of Bengal

et al. 2019

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“…observations are consistent with the ITE observed by the RV Revelle , as described below. Babu et al 15. also describe a doming of the upper thermocline forming an eddy of relatively cold water between 50 and 300 m with a diameter of 200 km, along the western margin BoB centered at 17°40′N, 85°19′E.…”

Section: Intrathermocline Eddiesmentioning

confidence: 97%

An Intrathermocline Eddy and a tropical cyclone in the Bay of Bengal

Gordon

Murty

2017

Sci Rep

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The Bay of Bengal, subjected to monsoonal forcing and tropical cyclones, displays a complex field of ocean eddies. On 5 December 2013 a sub-surface vortex or Intrathermocline Eddy (ITE) composed of water characteristic of the Andaman Sea was observed within the thermocline of the western Bay of Bengal. We propose that the ITE was the product of Tropical Cyclone Lehar interaction on 27 November 2013 with a westward propagating surface eddy from the eastern Bay of Bengal. While Lehar’s interaction with the ocean initially removes heat from the upper layers of the eddy, air-sea flux is limited as the deeper portions of the eddy was subducted into the stratified thermocline, inhibiting further interaction with the atmosphere. The ITE core from 30 to 150 m is thus isolated from local air-sea fluxes by strong stratification at the mixed layer base, and its periphery is stable to shear instability, suggestive of longevity and the ability to carry water far distances with minimal modification.

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“…The presence of eddies were reported along the western boundary of BoB in the earlier studies. Babu et al () showed the existence of a cold core eddy in northwestern BoB from Conductivity, Temperature and Depth (CTD) observations during late July 1984. The hydrographic survey conducted during March 1993 also indicated the presence of cyclonic and anticyclonic eddies in the poleward flow of EICC between 11 ∘ and 18 ∘ N (Sanilkumar et al, ).…”

Section: Introductionmentioning

confidence: 99%

Variability in Eddy Distribution Associated With East India Coastal Current From High‐Frequency Radar Observations Along Southeast Coast of India

et al. 2018

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Surface current observations from Indian Coastal Ocean Radar Network installed along the Tamil Nadu coast (southeast India) was used to quantify the mesoscale eddies associated with East India Coastal Current (EICC) during 2014–2017. A flow geometry‐based eddy detection algorithm has been applied to the daily averaged surface current maps and was able to detect and track mesoscale eddies of variable temporal and spatial scales. A total of 51 (27 cyclonic and 24 anticyclonic) eddy events, which lasted for more than 4 days, were identified during this period. Total count of cyclonic eddies exceeded the anticyclonic eddies with a clear seasonal pattern concurrent with the mean flow of EICC. The number of anticyclonic eddies leads in southwest monsoon and spring transition period; however, in fall transition and northeast monsoon period number of cyclonic eddies dominates in line with the poleward and equatorward phase of EICC, respectively. Monthly eddy kinetic energy maps showed a seasonal cycle with highest values in November and April. Monthly maps of the surface current vectors provide the broader picture of the seasonal reversal of currents in February and October and low magnitude offshore flow in the summer monsoon period. The Rossby number distribution along a transect perpendicular to the coast was in the order of O(1) shows the presence of strong submesoscale dynamics in the study domain. A case study of an eddy event conferred significant changes in the biological and physical properties of the coastal ocean derived from satellite data.

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A subsurface cyclonic eddy in the Bay of Bengal

Cited by 72 publications

References 0 publications

Characteristics of the Discontinuity of Western Boundary Current in the Bay of Bengal

Characteristics of the Discontinuity of Western Boundary Current in the Bay of Bengal

An Intrathermocline Eddy and a tropical cyclone in the Bay of Bengal

Variability in Eddy Distribution Associated With East India Coastal Current From High‐Frequency Radar Observations Along Southeast Coast of India

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