On the circulation in the Bay of Bengal during Northern spring inter-monsoon (March–April 1987)

Babu, M.T.; Sarma, Y.V.B.; Murty, V. S. N.; Vethamony, P.

doi:10.1016/s0967-0645(02)00609-4

Cited by 88 publications

(44 citation statements)

References 15 publications

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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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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 sediment plume near Kakinada Bay has extended eastward to a distance of about 300 kilometers from the coast. Babu et al [2003] analyzed temperature, salinity, altimeter sea surface height anomaly, wind stress curl (rotational movement of water, with positive wind stress curl generating upward movement of water and negative curl generating downward movement), and advanced very high resolution radiometer (AVHRR) temperature data. Using these observations, they studied the Western Boundary Current (WBC) in the Bay of Bengal during the spring intermonsoon period ( February-April).…”

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confidence: 99%

Seasonal Occurrence of Unique Sediment Plume in the Bay of Bengal

et al. 2008

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The movement of sediment plumes, detectable from ocean color sensors [Klemas et al., 1975; Khorram, 1981; Nezlin and DiGiacomo, 2005], depends primarily on coastal circulation [Fong and Geyer, 2002]. Hence, sediment plumes become tracers for studying circulation patterns. The Indian remote sensing satellite Oceansat 1 carries an ocean color monitor (OCM) sensor along with a microwave sensor. Using the OCM data, we studied the suspended sediment concentrations (SSC) during 1999–2006 and observed a plume coming off the Krishna‐Godavari River Basin (KGB) that is the only plume within the Bay of Bengal whose movement is controlled by prevailing currents. The KGB is located in the central part of the east coast of India between 16°43′, 17°00′N and 82°15′, 82°22′E (Figure 1a). Though high sediment concentration is present all along India's east coast, the offshoot of the plume is present only at the coast of Kakinada. The presence, extent, orientation, and intensity of this plume have both seasonal and interannual variations.

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“…2d-f, 3d-f, 4d-f) but at the same time, a cyclonic eddy is developed at 18.7°N, 87.7°E with CHP *46 9 10 7 J/m 2 . The cyclonic and anticyclonic eddies discussed above are also detected by Babu et al (2003) although there is little difference in the center locations. During May, the cyclonic eddy at 18°N, 86.8°E with CHP 58.4 9 10 7 J/m 2 intensified but completely moved out at the end of summer.…”

Section: Spring Season (March-may)mentioning

confidence: 89%

Movement of seasonal eddies and its relation with cyclonic heat potential and cyclogenesis points in the Bay of Bengal

Kumar

Chakraborty

2011

Nat Hazards

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Movement of seasonal eddies in the Bay of Bengal (BOB) and its relation with cyclonic heat potential (CHP) and cyclogenesis points have been investigated in this study using 6 years (2002-2007) of global ocean monthly analysis datasets based on the Simple Ocean Data Assimilation (SODA) package (SODA v2.0.4) of Carton et al. (2005) andIndian Meteorological Department cyclogenesis points. The region dominated by anticyclonic eddies with CHP greater than 70 9 10 7 J/m 2 as well as good correlations ([0.9) with sea surface height (SSH) and 26°C isothermal depth (D 26 ) can be a potential region of cyclogenesis. The region dominated by cyclonic eddies with CHP greater than 50 9 10 7 J/m 2 and good correlation ([0.9) with both SSH and D 26 can serve as a potential region of highlevel depression. Potential cyclogenesis regions are the southern BOB (5°N-12°N) for the post-monsoon season and the head of BOB (north of 15°N) during southwest monsoon. Seven potential regions are identified for the eddy formation for different seasons, which are consistent with the cyclogenesis points. The CHP distributions alone are able to explain the cyclone tracks for the pre-monsoon and post-monsoon seasons but not for the monsoon season.

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On the circulation in the Bay of Bengal during Northern spring inter-monsoon (March–April 1987)

Cited by 88 publications

References 15 publications

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

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

Seasonal Occurrence of Unique Sediment Plume in the Bay of Bengal

Movement of seasonal eddies and its relation with cyclonic heat potential and cyclogenesis points in the Bay of Bengal

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