Browsing Institute's contributions by Author "Alagarsamy, R."
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Comparative studies on trace metal geochemistry in Indian and Chinese rivers
Alagarsamy, R.; Zhang, J. (Indian Academy of Sciences, 2005)The trace metal geochemistry in Indian and Chinese rivers in the Asian region was studied to understand its variation on a global scale in terms of climate, geological conditions and anthropogenic impact. The average ... -
Data on heavy metal and magnetic relationships in coastal sediments from South East Coast of Tamilnadu, India
Ravisankar, R.; Harikrishnan, N.; Chandrasekaran, A.; Gandhi, M.S.; Alagarsamy, R. (Elsevier, 2018)In this data, the heavy metal concentration and magnetic susceptibility in coastal sediment samples collected from Periyakalapet to Parangaipettai of East Coast of Tamilnadu using Energy Dispersive X-ray Fluorescence (EDXRF) ... -
Determination of rare earth, major and trace elements in authigenic fraction of Andaman Sea (Northeastern Indian Ocean) sediments by inductively coupled plasma-mass spectrometry
Alagarsamy, R.; You, C.-F.; Nath, B.N.; SijinKumar, A.V. (Elsevier, 2010)Downcore variation of rare earth elements (REEs) in the authigenic Fe-Mn oxides of a sediment core (covering a record of last approx. 40 kyr) from the Andaman Sea, a part of the Indian Ocean shows distinctive positive Ce ... -
Distribution and seasonal variation of trace metals in surface sediments of the Mandovi estuary, west coast of India
Alagarsamy, R. (Elsevier, 2006)The concentration and distribution of selected trace metals in surface sediments of the Mandovi estuary were studied to determine the extent of anthropogenic inputs from mining activities and to estimate the effects of ... -
Environmental magnetism and application in the continental shelf sediments of India
Alagarsamy, R. (Elsevier, 2009)Mineral magnetic and geochemical analyses were carried out on surface sediments from the continental shelf of India. The purpose of this study is to examine the environmental assessment of heavy metal concentrations and ... -
Geochemical characterisation of major and trace elements in the coastal sediments of India
Alagarsamy, R.; Zhang, J. (Springer, 2010)Thirty-five surface sediment samples from the Indian continental shelf were recovered offshore from the mouths of the major rivers (Brahmaputra, Ganges, Narmada, Tapti, Godavari, Krishna and Cauvery) discharging into the ... -
Geochemical variability of copper and iron in Oman margin sediments
Alagarsamy, R. (Elsevier, 2009)An analysis of the geochemical distribution of selected trace metals among various geochemical phases of the sediments in the Oman Margin was carried out using a sequential extraction technique. The present study showed ... -
Hydrographic and productivity characteristics along 45 degrees E longitude in the southwestern Indian Ocean and Southern Ocean during austral summer 2004
Jasmine, P.; Muraleedharan, K.R.; Madhu, N.V.; AshaDevi, C.R.; Alagarsamy, R.; Achuthankutty, C.T.; Jayan, Z.; Sanjeevan, V.N.; Sahayak, S. (Inter-Research, 2009)During the austral summer 2004, an intensive multidisciplinary survey was carried out in the Indian Ocean sector of the Southern Ocean to study the main hydrographic features and the associated productivity processes. This ... -
Major elements, nutrients, and plankton biomass in the ice edge and an offshore region of the Indian Ocean sector of the Southern Ocean
Shirodkar, P.V.; Goes, J.I.; Alagarsamy, R.; Fondekar, S.P. (Cambridge University Press, 1992) -
Metal pollutants in Indian continental coastal marine sediment along a 3700 km transect: An electron paramagnetic resonance spectroscopic study
Alagarsamy, R.; Hoon, S.R. (Elsevier, 2018)We report the analysis and geographical distribution of anthropogenically impacted marine surficial sediments along a 3700 km transect around the continental shelf of India. Sediments have been studied using a mixed ... -
Nitrogen transformations as inferred from the activities of key enzymes in the Arabian Sea oxygen minimum zone
Shailaja, M.S.; Narvekar, P.V.; Alagarsamy, R.; Naqvi, S.W.A. (Elsevier, 2006)Vertical distributions of the potential activities of some key enzymes mediating nitrification and denitrification were investigated within the oxygen (O2) minimum zone of the Arabian Sea at a number of locations between ... -
Observations of post tsunami reconnaissance investigations along eastern coastal tract of India following the devastating tsunami of 26th December 2004
Bhattacharya, G.C.; Ilangovan, D.; Jayakumar, S.; ManiMurali, R.; Kocherla, M.; Alagarsamy, R.; Gowthaman, R.; Naik, K.A. (National Inst. of Oceanography, 2005)Many coastal regions of India were affected by the tsunami caused by a magnitude 9 earthquake off Sumatra on 26th December 2004. This report presents the observations of post-tsunami reconnaissance survey conducted by the ... -
Organic carbon in the sediments of Mandovi estuary, Goa
Alagarsamy, R. (NISCAIR, New Delhi, 1991)Total organic carbon (TOC) in surficial sediments in Mandovi Estuary, Goa, India varies widely from 0.1 to 3% (av. 1.05%). Highest values of TOC (2.4-3%) lie close to the mouth region and indicate no definite trend in its ... -
Organic matter composition in sediments of the Oman margin
Alagarsamy, R. (Taylor and Francis, 2003)The quantity and biochemical composition of organic matter (OM) in the sediments underlying and below oxygen minimum zone (OMZ) in the Arabian Sea were studied to provide information on the diagenetic processes of organic ... -
Partitioning and speciation of trace metal diagenesis in differing depositional environments in the sediments of the Oman margin
Alagarsamy, R.; Wolff, G.A.; Chester, R. (Springer, 2005)Organic-rich sediment samples collected from a transect within, and below, the Oman Margin oxygen minimum zone (OMZ)were analysed using a sequential leaching technique to characterise the diagenetic behaviour and speciation ... -
Petroleum hydrocarbon contamination along oil tanker routes in the Arabian Sea
Fondekar, S.P.; Alagarsamy, R. (CSIR-NISCAIR, 1984)Concentration of petroleum hydrocarbons in seawater from the oil tanker route region between 0-25 N and 45-75 E were estimated using UV-absorbance and fluoroscence techniques. Concentrations in surface waters averaged 9.2 ... -
Sediment fluxes and the littoral drift along northeast Andhra Pradesh Coast, India: Estimation by remote sensing
Kunte, P.D.; Alagarsamy, R.; Hursthouse, A.S. (Springer, 2013)The littoral drift regime along the northeastern coast of India was investigated by analyzing coastal drift indicators and shoreline changes based on multitemporal satellite images. The study of offshore turbidity patterns ... -
State of oil pollution in the northern Arabian Sea after the 1991 Gulf oil spill
Sengupta, R.; Fondekar, S.P.; Alagarsamy, R. (Pergamon, 1993)Following the enormous oil spills resulting from the 1990-91 military conflict in the Gulf, fears were expressed concerning dissipation of oil from the Gulf into the Arabian Sea and Indian Ocean. To investigate contamination ... -
Statistical assessment to magnetic susceptibility and heavy metal data for characterizing the coastal sediment of East coast of Tamilnadu, India
Harikrishnan, N.; Chandrasekaran, A.; Ravisankar, R.; Alagarsamy, R. (Pergamon, 2018)A rapid urbanization and industrialization enhances the significant heavy metal pollution in the sediments of coastal area and introduced a serious threat to the human health. In the present study, concentration of heavy ... -
Studies on the nutrient distribution in the Southern Ocean waters along the 45 degrees E transect
Rajakumar, A.; Alagarsamy, R.; Khare, N.; Saraswat, R.; Subramaniam, M.M. (NISCAIR, India, 2008)Seawater samples from the surface as well as at different depths of the water column were collected from 30 stations during the Pilot Expedition to Southern Ocean (PESO). The sampling stations were along a transect between ...