The western boundary current of the seasonal subtropical gyre in the Bay of Bengal

Shetye, S.R.; Gouveia, A.D.; Shenoi, S. S. C.; Sundar, D.; Michael, G. S.; Nampoothiri, G.

doi:10.1029/92jc02070

Cited by 218 publications

(115 citation statements)

References 14 publications

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“…During the early northeast monsoon in November the large-scale flow pattern in the bay is cyclonic, and the western boundary current, the East Indian Coastal Current (EICC), flows southward from the Bengal Shelf north of 20øN to the east coast of Sri Lanka. In February the EICC reverses and flows northward along the Indian coast, reaching its maximum strength during the early southwest monsoon in April/May [Shetye et al, 1993]. In the interior of the Bay of Bengal the large-scale flow is anticyclonic during this time.…”

Section: Introductionmentioning

confidence: 97%

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Seasonal variability of the Bay of Bengal circulation inferred from TOPEX/Poseidon altimetry

Eigenheer¹,

Quadfasel²

2000

J. Geophys. Res.

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Abstract. The circulation in the interior of the Bay of Bengal and of its western boundary current, the East Indian Coastal Current, is inferred from historical ship drift data and from TOPEX/Poseidon altimeter data. The boundary current shows a strong seasonal variability with reversals twice per year that lead the reversal of the local monsoon wind field by several months. On the basis of model simulations it has been suggested that this unusual behavior can be explained by the influence of remotely forced planetary waves. Our data analysis confirms and refines this view by showing the role of topography in the northern bay. We also give an estimate of the relative importance of the different contributions.

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Section: Introductionmentioning

confidence: 97%

“…In contrast, the western boundary current in the Bay of Bengal appears to lead the wind field, and the EICC flows against the local winds at the end of both monsoon seasons [Shetye et al, 1991[Shetye et al, , 1993.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variability of the Bay of Bengal circulation inferred from TOPEX/Poseidon altimetry

Eigenheer¹,

Quadfasel²

2000

J. Geophys. Res.

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“…This cold-core eddy was found to enhance the biological productivity by more than double. Though the existence of eddies in the Bay of Bengal has been documented by several authors (Ramasastry and Balaramamurty, 1957;Rao and Sastry, 1981;Legeckis, 1987;Babu et al, 1991;Murty et al, 1993;Shetye et al, 1993;Sanilkumar et al, 1997;Babu et al, 2003;Madhusoodhanan and James, 2003;Prasanna Kumar et al, 2004) their role in the context of biological production is yet to be explored fully. An attempt towards this was made by Prasanna Kumar et al (2004) using data collected during summer monsoon.…”

Section: Introductionmentioning

confidence: 99%

Eddy-mediated biological productivity in the Bay of Bengal during fall and spring intermonsoons

Kumar

Murukesh

Ramaiah

et al. 2007

Deep Sea Research Part I: Oceanographic Research Papers

181

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The signature of cold-core eddies and their role in altering the biological productivity of the Bay of Bengal was examined using two recent sets of hydrographic data collected along the central and western Bay of Bengal during fall (14 September -12 October, 2002) and spring (12 April -7 May, 2003) intermonsoons under the Bay of Bengal Process Studies (BOBPS) programme. Based on the thermohaline structure and the satellite-derived sea-level anomaly maps 9 cyclonic eddies were identified. Out of this, 4 cyclonic eddies -2 each along the central Bay and along the western boundary -occurred during fall intermonsoon 2002, while 5 occurred -3 along the central Bay and 2 along the western boundary -during spring intermonsoon. The eddy depressed the temperature, which varied from 3 o C to 7 o C at 120 m depth. Maximum depression of temperature was associated with spring-time eddies in the northern Bay, where subsurface stability was low. The reduced water column stability in spring leads to greater eddypumping, thereby cooling the water to a greater extent. However, the cyclonic eddies were unable to break the stratification of the top 20m layer, thereby curtailing their effects below this depth during both seasons. Eddypumping not only cooled the water column but also enhanced the nutrient concentrations. This in turn increased the biological productivity of the Bay to 1½-2 times. In addition, the subsurface chlorophyll maximum (SCM), which is generally located between 40 and 70 m in fall and 60 and 90 m in spring intermonsoons, shallowed under the influence of the eddies and also enhanced the chlorophyll concentration in the SCM to more than double. Thus, eddy-pumping of nutrients controls the biological productivity of the Bay of Bengal during both the seasons. In the fall intermonsoon, however, the riverine input of nutrients and sediments in the northern Bay also plays a role in altering the biological productivity. This has an overall implication to the basin-wide new production and export flux and, at least partly, resolves the reason for the comparable annual fluxes of organic carbon

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“…During the blooming period, the study area experiences seasonal winds and the wind is in the northeast direction during winter and at the end of winter, in February, when the winds are still northeasterly, the current along the western boundary reverses and flows northward. The East India Coastal current (EICC) peaks during March-April, when the winds are weak (Shetye et al,1993) and in May, prior to the intensification of summer monsoon, the EICC gets weaken and reverses to a southward flow in the northern part (Shetye et al, 1991). Along the East Coast of India, the water flow reverses its direction to north seasonally from January with the East Indian Coastal Current (EICC) and East Indian Winter Jet to south in the rest of the months (Choudhury et al, 1989).…”

Section: Seasonal Distribution Of Chlorophyll-amentioning

confidence: 99%

Seasonal variability of phytoplankton blooms in the coastal waters along the East coast of India

Latha

Rao

Amminedu

et al. 2014

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Bay of Bengal (BOB) is a semi enclosed tropical basin located in the north eastern part of the Indian Ocean with high influence of fresh water discharge from major rivers and rainfall. Bay of Bengal (BOB) is highly influenced by monsoons and represents a natural laboratory to study the effect of fresh water fluxes on the marine ecosystem. Bay of Bengal (BOB) is very low in productivity often with the observations of Phytoplankton Blooms. Phytoplankton blooms are one of the prominent features of biological variability in the coastal ecosystems such as estuaries, lagoons, bays, and tidal rivers with rapid production and accumulation of phytoplankton biomass in the ocean. These blooms usually respond to changing physical forcings originating in the coastal ocean like tides, currents and river runoff and to the atmospheric forcing like wind. These physical forcings have different timescales of variability, so algal blooms can be short-term episodic events, recurrent seasonal phenomena, or rare events associated with exceptional climatic or hydrologic conditions. Bloom events and their variability on spatial & temporal scales monitoring through field measurements is difficult. Based on this key hypothesis an effort is made to understand the seasonal and spatial variability of Phytoplankton Blooms along the East Coast of India. In this paper we present the bloom dynamics in their context to the chlorophyll concentration along with species composition and abundance in estuarine and near shore coastal waters of Godavari basin using Oceansat-2 Ocean Colour Monitor (OCM). The initial results revealed that the quasi permanent phytoplankton blooms initiates in the month of midFebruary and evolves for a period of two months and then slowly starts decaying by the mid of May month. The results also stand as a base for the study of influence of Phytoplankton Blooms on the carbon flux estimations and bio-geo-chemical processes in the Bay of Bengal.

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The western boundary current of the seasonal subtropical gyre in the Bay of Bengal

Cited by 218 publications

References 14 publications

Seasonal variability of the Bay of Bengal circulation inferred from TOPEX/Poseidon altimetry

Seasonal variability of the Bay of Bengal circulation inferred from TOPEX/Poseidon altimetry

Eddy-mediated biological productivity in the Bay of Bengal during fall and spring intermonsoons

Seasonal variability of phytoplankton blooms in the coastal waters along the East coast of India

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