Browsing by Author "PrasannaKumar, S."
Now showing items 1-20 of 104
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A decade of physical and biogeochemical measurements in the Northern Indian Ocean.
PrasannaKumar, S.; Sardesai, S.; Ramaiah, N. (ESA Publication, 2010)The northern Indian Ocean consists of two tropical basins (Arabian Sea and Bay of Bengal) and the equatorial region that comes under the influence of monsoonal wind reversal. We present the results from three Indian ... -
A reduction in marine primary productivity driven by rapid warming over the tropical Indian Ocean
Roxy, M.K.; Modi, A.; Murtugudde, R.; Valsala, V.; Panickal, S.; PrasannaKumar, S.; Ravichandran, M.; Vichi, M.; Levy, M. (American Geophysical Union, 2016)Among the tropical oceans, the western Indian Ocean hosts one of the largest concentrations of marine phytoplankton blooms in summer. Interestingly, this is also the region with the largest warming trend in sea surface ... -
A study on the physical and biogeochemical responses of the Bay of Bengal due to cyclone Madi
Chowdhury, R.R.; PrasannaKumar, S.; Chakraborty, Arun (Taylor & Francis, 2022)Madi was a category-2 cyclonic storm formed over the south-western Bay of Bengal (BoB) in December 2013. It formed on 6th December as a depression, and by 8th December it became a very severe cyclonic storm. Some unique ... -
A subsurface cyclonic eddy in the Bay of Bengal
Babu, M.T.; PrasannaKumar, S.; Rao, D.P. (Yale University, 1991)CTD data collected from the Northwestern Bay of Bengal during late July 1984 reveal the existence of a cold core subsurface eddy centred at 17 degrees 40'N and 85 degrees 19'E. The thermal structure observed across the ... -
Acoustic propagation within a surface duct in the western Bay of Bengal
PrasannaKumar, S.; Navelkar, G.S.; Murty, T.V.R.; Murty, C.S. (CSIR-NISCAIR, 1994)Sound speed structure forms a surface duct in the upper 50 m layer in the western Bay of Bengal during late July. A range-dependent acoustic ray computation shows that some rays emanating from a source within the upper 30 ... -
Acoustic propagational characteristics and tomography studies of the northern Indian Ocean
PrasannaKumar, S.; Somayajulu, Y.K.; Murty, T.V.R. (Narosa, New Delhi (India), 1997)The results of the acoustic tomographic studies carried out in five sections of the Northern Indian Ocean is given. The characteristics of the sound speed field of the northern Indian Ocean comprising of the Arabian Sea ... -
Acoustic propagations in the presence of a subsurface cold core eddy in the Bay of Bengal - A case study
PrasannaKumar, S.; Navelkar, G.S.; Murty, T.V.R.; Murty, C.S. (PORSEC-94, Melbourne, Australia, 1994)Acoustic characteristics of a cold core eddy, observed in the Bay of Bengal during southwest monsoon period is studied using CTD data along the western boundary. The presence of eddy brings about a reduction in the ambient ... -
Acoustic tomography experiment in the eastern Arabian Sea
PrasannaKumar, S.; Murty, T.V.R.; Somayajulu, Y.K.; Saran, A.K.; Navelkar, G.S.; Almeida, A.M.; Fernando, V.; Murty, C.S. (European Acoustics Association, 1999)An acoustic transmission experiment was conducted in the eastern Arabian Sea along 12.5 degrees N latitude for a duration of ten days (2-12 May, 1993), with two transceiver systems deployed on deep sea moorings, separated ... -
Acoustic waveguide characteristics of the Indian Ocean - north of equator
PrasannaKumar, S.; Murty, T.V.R.; Somayajulu, Y.K.; Murty, C.S. (PORSEC Committee, Shimizu, Japan, 1992)The acoustic characteristics of the waters of the Arabian Sea and Bay of Bengal, constituting the northern Indian Ocean, are analysed based on a climatological mean sound speed field. In the upper 30-40 m in the Bay of ... -
Acoustical characteristics and simulated tomographic inversion of a cold core eddy in the Bay of Bengal
PrasannaKumar, S.; Navelkar, G.S.; Murty, T.V.R.; Murty, C.S. (European Acoustics Association, 1997)Acoustic characteristics of a subsurface, cold core eddy observed in the Bay of Bengal during southwest monsoon period is presented based on CTD (Conductivity Temperature Depth) data from 42 stations. The effect of the ... -
Air-Sea Coupling Over The Equatorial Indian Ocean
Gopika, N. (2007)The present work aims at understanding the upper ocean variability of the EIO on a seasonal scale and then to explore the atmospheric forcing responsible for it.To achieve the objective, the Equatorial Indian Ocean between ... -
Analysis of chlorophyll pigment concentration in the northern Arabian Sea using remote sensing and GIS
Thapa, S. (2007)The phytoplankton in the ocean plays an important role not only because it produces food that sustains the marine life, but also it is capable of regulating CO2 and there by influencing the climate of the earth system. It ... -
Application of remote sensing and GIS in the analysis of environment of Bay of Bengal
Patidar, B. (2006)The Bay of Bengal is a northern extended arm of the Indian Ocean, situated in eastern part between equator and 220N latitude and 800E and 1000E longitude. It is a tropical basin, landlocked in the north by the landmasses ... -
Arabian Sea upwelling - A comparison between coastal and open ocean regions
Muraleedharan, P.M.; PrasannaKumar, S. (Current Science Association, Bangalore, India, 1996)The response of the eastern Arabian Sea to prevailing winds during an upwelling event, in the peak of southwest monsoon, was studied at both coastal and open ocean environment based on the data collected as a part of the ... -
Are eddies nature’s trigger to enhance biological productivity in the Bay of Bengal?
PrasannaKumar, S.; Nuncio, M.; Kumar, A.; Sardessai, S.; DeSouza, S.N.; Gauns, M.; Ramaiah, N.; Madhupratap, M. (American Geophysical Union, 2004)The Bay of Bengal is traditionally considered to be a less productive basin compared to the Arabian Sea. Despite the contrasting chlorophyll and primary productivity pattern, sediment trap data shows that annual fluxes of ... -
Back-to-Back Occurrence of Tropical Cyclones in the Arabian Sea During October-November 2015: Causes and Responses
Chowdhury, R.R.; PrasannaKumar, S.; Narvekar, J.; Chakraborty, A. (American Geophysical Union (AGU), 2020)In the Arabian Sea, two extremely severe cyclonic storms occurred back to back during October-November 2015. Using a suite of ocean and atmospheric data, we examined the upper ocean responses of tropical cyclones Chapala ... -
Bay of Bengal Process Studies (BOBPS) Final Report
PrasannaKumar, S.; Sardessai, S.; Ramaiah, N.; Bhosle, N.B.; Ramaswamy, V.; Ramesh, R.; Sharada, M.K.; Sarin, M.M.; Sarupria, J.S.; Muraleedharan, U. (Department of Ocean Development, New Delhi, 2007)The Bay of Bengal Process Studies (BOBPS) was conceived in early 1997 as a sequel to the JGOFS (Joint Global Ocean Flux Study) India - Arabian Sea Process Study. Soon after the completion of the JGOFS field experiments ... -
Bio-physical coupling and ocean dynamics in the central equatorial Indian Ocean during 2006 Indian Ocean Dipole
PrasannaKumar, S.; David, T.D.; Byju, P.; Narvekar, J.; Yoneyama, K.; Nakatani, N.; Ishida, A.; Horii, T.; Masumoto, Y.; Mizuno, K. (American Geophysical Union, 2012)The high-frequency times-series data collected during 28th October to 21st November 2006 onboard R/V Mirai provided the first evidence of short-term bio-physical coupling in the central equatorial Indian Ocean (EIO). The ... -
Biogeochemistry of the Bay of Bengal: Physical, chemical and primary productivity characteristics of the central and western Bay of Bengal during summer monsoon 2001
Madhupratap, M.; Gauns, M.; Ramaiah, N.; PrasannaKumar, S.; Muraleedharan, P.M.; DeSousa, S.N.; Sardessai, S.; Muraleedharan, U.D. (Elsevier, 2003)Reliable data on biological characteristics from the Bay of Bengal are elusive. In this paper, we present results on physics, chemistry and biology simultaneously measured during the summer monsoon, 2001 from open ocean ... -
Canonical sound speed profile for the central Bay of Bengal
Murty, T.V.R.; PrasannaKumar, S.; Somayajulu, Y.K.; Sastry, J.S.; De Figueiredo, R.J.P. (Indian Academy of Sciences, Bangalore, 1989)Following Munk's canonical theory, an algorithm has been presented for computing sound channel parameters in the western and southern Bay of Bengal. The estimated canonical sound speed profile using these parameters has ...