Interannual variability and characteristics of the East India Coastal Current associated with Indian Ocean Dipole events using a high resolution regional ocean model

Dandapat, Sumit; Chakraborty, Arun; Kuttippurath, J.

doi:10.1007/s10236-018-1201-5

Cited by 21 publications

(12 citation statements)

References 32 publications

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“…The EICC often flows southward during the NE monsoon and northward during the SW monsoon [36,59]. It is however strongly impacted by remote forcing through Kelvin waves, which causes it to occasionally oppose local winds and flow in unexpected directions [12,19,36,51]. In addition, westwardtraveling Rossby waves, forced by variable winds in the interior of the BoB, impact the EICC [22,36,59].…”

Section: Sss In the Northern Indian Oceanmentioning

confidence: 99%

“…In addition, westwardtraveling Rossby waves, forced by variable winds in the interior of the BoB, impact the EICC [22,36,59]. A study by [12] suggests that the EICC is most unstable, disorganized, and weak during PIOD events. Furthermore, a modeling study by [2] and satellite study by [19] suggest that PIOD events tend to generate large-scale sea level anomalies and anticyclonic flows near the coastal areas of the western BoB.…”

Section: Sss In the Northern Indian Oceanmentioning

confidence: 99%

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Impacts of the 2019 Strong IOD and Monsoon Events on Indian Ocean Sea Surface Salinity

Nyadjro

2021

Remote Sens Earth Syst Sci

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The impact of the 2019 super positive Indian Ocean Dipole (PIOD) event, the strongest in the last four decades, which also cooccurred with an El Niño and a strong summer monsoon, on Indian Ocean sea surface salinity (SSS) is examined using the Soil Moisture Active Passive satellite measurements. Salt budget estimation suggests a predominant, nearly ocean-wide influence by surface freshwater flux and horizontal advective terms. Subsurface ocean influence on the salt budget occurs mainly in the southeastern tropical Indian Ocean (SETIO). The PIOD event suppressed the influence of the El Niño, thereby causing anomalous high precipitation in western India, and leading to an unusual freshening in the southeastern Arabian Sea (AS), which is subsequently advected towards the equatorial Indian Ocean (EIO). In the western Bay of Bengal (BoB), following the waning of monsoon-influenced precipitation in the fall, SSS becomes anomalously salty and traverses towards the AS against the flow of anomalous surface currents. During the peak of the summer monsoon in August-September and the peak of the PIOD event in September-November, SSS in the EIO exhibited tendency for freshening, mainly driven by westward advection of freshwater from the eastern BoB. Conversely, in the SETIO, there was tendency for salinification due to suppression of precipitation, enhanced upwelling of high subsurface salinity, and northward advection of salty water. During December to January of the following year, these salinity tendencies reversed, with salinification in the EIO and freshening in the SETIO.

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Section: Sss In the Northern Indian Oceanmentioning

confidence: 99%

Section: Sss In the Northern Indian Oceanmentioning

confidence: 99%

Impacts of the 2019 Strong IOD and Monsoon Events on Indian Ocean Sea Surface Salinity

Nyadjro

2021

Remote Sens Earth Syst Sci

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“…The Regional Ocean Modelling System (ROMS_AGRIF Version 3.1), which is extensively used to study the circulation pattern in the BOB (Dandapat et al, ; Jana et al, ; Sil & Chakraborty, , ), is used in the study. It is a general class of free surface, terrain following numerical model that solves the three‐dimensional Reynolds averaged Navier‐Stokes equations using the hydrostatic and Boussinesq approximations (Haidvogel et al, , ; Shchepetkin & McWilliams, , ).…”

Section: Model Descriptionmentioning

confidence: 99%

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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“…The East India Coastal Current (EICC), also known as the western boundary current of the Bay of Bengal 38 – 42 flows along the east coast of India. The impact of the transient monsoon system alters the EICC direction twice a year 43 , 44 , flowing northward during February–May and southward during October–December. During the Indian Summer Monsoon period (June–September), the boundary current is not consistent as the western BoB is also dominated by high eddy activity significantly at northern and southwestern BoB and offshore Visakhapatnam, which are responsible for the discontinuity observed in EICC during Indian Summer Monsoon period 45 .…”

Section: Introductionmentioning

confidence: 99%

Extraction of persistent lagrangian coherent structures for the pollutant transport prediction in the Bay of Bengal

Trinadha Rao,

Suneel,

Gulakaram

et al. 2024

Sci Rep

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Lagrangian Coherent Structures (LCS) are the hidden fluid flow skeletons that provide meaningful information about the Lagrangian circulation. In this study, we computed the monthly climatological LCSs (cLCS) maps utilizing 24 years (1994–2017) of HYbrid Coordinate Ocean Model (HYCOM) currents and ECMWF re-analysis winds in the Bay of Bengal (BoB). The seasonal reversal of winds and associated reversal of currents makes the BoB dynamic. Therefore, we primarily aim to reveal the cLCSs associated with seasonal monsoon currents and mesoscale (eddies) processes over BoB. The simulated cLCS were augmented with the complex empirical orthogonal functions to confirm the dominant lagrangian transport pattern features better. The constructed cLCS patterns show a seasonal accumulation zone and the transport pattern of freshwater plumes along the coastal region of the BoB. We further validated with the satellite imagery of real-time oil spill dispersion and modelled oil spill trajectories that match well with the LCS patterns. In addition, the application of cLCSs to study the transport of hypothetical oil spills occurring at one of the active oil exploration sites (Krishna-Godavari basin) was described. Thus, demonstrated the accumulation zones in the BoB and confirmed that the persistent monthly cLCS maps are reasonably performing well for the trajectory prediction of pollutants such as oil spills. These maps will help to initiate mitigation measures in case of any occurrence of oil spills in the future.

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Interannual variability and characteristics of the East India Coastal Current associated with Indian Ocean Dipole events using a high resolution regional ocean model

Cited by 21 publications

References 32 publications

Impacts of the 2019 Strong IOD and Monsoon Events on Indian Ocean Sea Surface Salinity

Impacts of the 2019 Strong IOD and Monsoon Events on Indian Ocean Sea Surface Salinity

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

Extraction of persistent lagrangian coherent structures for the pollutant transport prediction in the Bay of Bengal

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