Browsing Institute's contributions by Author "Thamban, M."
Now showing items 1-20 of 26
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A century of climate variability in central Dronning Maud Land, East Antarctica, and its relation to Southern Annular Mode and El Nino-Southern Oscillation
Naik, S.S.; Thamban, M.; Laluraj, C.M.; Redkar, B.L.; Chaturvedi, A. (American Geophysical Union, 2010)Stable isotope records of oxygen and hydrogen were studied from a 65 m long ice core retrieved from central Dronning Maud Land, East Antarctica, in order to reconstruct the coastal Antarctic climate variability during the ... -
Antarctic climate variability during the past few centuries based on ice core records from coastal Dronning Maud Land and its implications on the Recent warming
Thamban, M.; Naik, S.S.; Laluraj, C.M.; Chaturvedi, A.; Ravindra, R. (Springer-Verlag, 2012)Analysis of the available instrumental records revealed that Antarctica has undergone complex and significant temperature changes during the recent decades, with a substantial warming in most parts of the West Antarctica ... -
Changing depositional environments during the Late Quatrnary along the western continental margin of India
Thamban, M. (Indian Association of Sedimentologists, 1998)Sedimentalogical and palaeoceanographic studies were carried out on two sediment cores collected within the Oxygen Minimum Zone (OMZ - between 150 to 1200 m water depth) along the western continental margin of India. The ... -
Clay minerals as palaeomonsoon proxies: Evaluation and relevance to the late Quaternary records from SE Arabian Sea
Thamban, M.; Rao, V.P. (NCAOR, Goa, 2005)Palaeoclimatic studies are largely dependent on the quality of records and a prudent use of environmental proxy indicators. In this study, the factors affecting the detrital clay minerals in marine environment and their ... -
Controls on organic carbon distribution in sediments from the eastern Arabian Sea margin
Thamban, M.; Rao, V.P.; Raju, S.V. (Springer, 1997)Sediment cores from the upper continental slope of the eastern Arabian Sea have high organic carbon (OC), CaCO sub(3), and sand content at the top. The values decrease with increasing depth in the Holocene and Upper ... -
Distribution and composition of verdine and glaucony facies from the sediments of the western continental margin of India
Thamban, M.; Rao, V.P. (Society for Sedimentary Geology, Tulsa, USA, 2000)Investigations on green grains from sediments of the western continental margin of India, between Ratnagiri and Cape Comorin, (water depth 37-330 m) indicate the presence of verdine and glaucony facies. Verdine facies ... -
Dune associated calcretes, Rhizoliths and Paleosols from the western continental shelf of India
Rao, V.P.; Thamban, M. (Geological Society of India, 1997)The calcareous deposits on the western continental shelf of India, off Bhatkal (water depths 50 to 58 m) occur as crusts, sheets, cylinders and reddish brown mudstones. The outer layers of the crusts are micrite-dominated ... -
Ecology of coccolithophores in the Indian sector of the Southern Ocean
Mohan, R.; Mergulhao, L.P.; Guptha, M.V.S.; Rajakumar, A.; Thamban, M.; AnilKumar, N.; Sudhakar, M.; Ravindra, R. (Elsevier, 2008)The ecology of coccolithophores (including species’ absolute abundance) in the water column (0-200 m) was studied in the Indian sector of the Southern Ocean, along the 45 degrees E meridian south of Madagascar to Antarctica, ... -
Evidences of late quaternary neotectonic activity and sea-level changes along the western continental margin of India
Rao, V.P.; Veerayya, M.; Thamban, M.; Wagle, B.G. (Current Science Association, Bangalore, India, 1996)The offshore data on sea-level changes along the western margin of India have been reviewed and evidences of Late Quaternary neotectonic activity and subsidence are documented, based on the diagenetic textures of limestones ... -
Glacial to Holocene fluctuations in hydrography and productivity along the southwestern continental margin of India
Thamban, M.; Rao, V.P.; Schneider, R.R.; Grootes, P.M. (Elsevier, 2001)Oxygen isotope and sedimentological records of a sediment core from the southwestern continental margin of India are used to reconstruct the fluctuations in sea surface hydrography and productivity during the last deglaciation. ... -
High resolution climate reconstructions of recent warming using instrumental and ice core records from coastal Antarctica
Thamban, M.; Naik, S.S.; Laluraj, C.M.; Ravindra, R. (India Meteorological Department, 2011)In-situ observational record of Antarctic surface temperatures is rather sparse. Proxy based ice core studies are thus critical for reconstructing the past climate change on centennial and decadal time scales. The present ... -
Indian summer monsoon variability during the Holocene as recorded in sediments of the Arabian Sea: Timing and implications
Thamban, M.; Kawahata, H.; Rao, V.P. (TERRAPUB, 2007)Indian monsoon precipitation fluctuated significantly during the Holocene and a reliable reconstruction of the timing of the events and their implications is of great benefit to our understanding of the effect and response ... -
Instrumental, terrestrial and marine records of the climate of South Asia during the Holocene: Present status, unresolved problems and societal aspects
Singhvi, A.K.; Rupakumar, K.; Thamban, M.; Gupta, A.K.; Kale, V.S.; Yadav, R.R.; Bhattacharya, A.; Phadtare, N.R.; Roy, P.D.; Chauhan, M.S.; Chauhan, O.S.; Chakravorty, S.; Sheikh, M.M.; Manzoor, N.; Adnan, M.; Ashraf, J.; Khan, A.M.; Quadir, D.A.; Devkota, L.P.; Shrestha, A.B. (Capital Publishing Co., 2010)A key societal aspect is to recognize the factors controlling the spatial variability and the distribution patterns of rainfall in a season, and its long as well as short term variability due to natural factors. We archive ... -
Microbial communities associated with Antarctic snow pack and their biogeochemical implications
Antony, R.; Sanyal, A.; Kapse, N.; Dhakephalkar, P.K.; Thamban, M.; Nair, S. (Urban & Fischer, 2016)Snow ecosystems represent a large part of the Earth's biosphere and harbour diverse microbial communities. Despite our increased knowledge of snow microbial communities, the question remains as to their functional potential, ... -
Molecular Insights on Dissolved Organic Matter Transformation by Supraglacial Microbial Communities
Antony, R.; Willoughby, A.S.; Grannas, A.M.; Catanzano, V.; Sleighter, R.L.; Thamban, M.; Hatcher, P.G.; Nair, S. (American Chemical Society, 2017)Snow overlays the majority of Antarctica and is an important repository of dissolved organic matter (DOM). DOM transformations by supraglacial microbes are not well understood. We use ultrahigh resolution mass spectrometry ... -
New stable isotope records of sediment cores from the SE Arabian Sea - Inferences on the variations in monsoon regime during the late Quaternery
Thamban, M.; Rao, V.P. (Indian Academy of Sciences, 2001)We reconstruct here the changes in regional hydrography related to the fluctuations in Indian monsoons during the late Quaternary based on the stable isotope composition of the foraminifers and organic matter in three ... -
Nitrate records of a shallow ice core from East Antarctica: Atmospheric processes, preservation and climatic implications
Laluraj, C.M.; Thamban, M.; Naik, S.S.; Redkar, B.L.; Chaturvedi, A.; Ravindra, R. (SAGE Publications, 2011)High-resolution records of nitrate (NO sub(3) sup(-)), oxygen isotope (delta sup(18) O) and non-sea salt sulphate (nssSO sub(4) sup(2-)) were studied using an ice core collected from central Dronning Maud Land in East ... -
Organic carbon in Antarctic snow: spatial trends and possible sources
Antony, R.; Mahalinganathan, K.; Thamban, M.; Nair, S. (American Chemical Society, 2011)Organic carbon records in Antarctic snow are sparse despite the fact that it is of great significance to global carbon dynamics, snow photochemistry, and air–snow exchange processes. Here, surface snow total organic carbon ... -
Origin and significance of high-grade phosphorite in a sediment core from the continental slope off Goa, India
Rao, V.P.; Rao, Ch.M.; Thamban, M.; Natarajan, R.; Rao, B.R. (Current Science Association, Bangalore, India, 1995)A phosphorite crust was found at 380-390 cm depth interval of a sediment core collected from the topographic high occurring on the continental slope off Goa. This crust is fragile and grey to light brown in colour. Carbonate ... -
Paleoclimatic and diagenetic history of the Late Quaternary sediments in a core from the southeastern Arabian Sea: Geochemical and magnetic signals
Rao, V.P.; Kessarkar, P.M.; Thamban, M.; Patil, S.K. (The Oceanographic Society of Japan, 2010)Geochemical and rock-magnetic investigations were carried out on a sediment core collected from the SE Arabian Sea at 1420 m depth in oxygenated waters below the present-day oxygen minimum zone. The top 250 cm of the core ...