DRS at CSIR-National Institute of Oceanography: Recent submissions
Now showing items 6821-6840 of 9429
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Mid-ocean ridges, InRidge and the future
(Indian Academy of Sciences, 2003)In this article, we chronicle the events that lead to the creation of a global scientific network for midoceanic ridge research, identify areas where Indian researchers could participate and built a case to support and ... -
Structure, tectonic and petrology of mid-oceanic ridges and the Indian scenario
(Indian Academy of Sciences, 2003)We examine and synthesize the existing information about the structure, tectonic and petrology of the 70,000 km long mid-oceanic ridges and focus on similar studies made of the Carlsberg–Central Indian Ridges. The potential ... -
IMD's model for forecasting monsoon in India
(Indian Academy of Sciences, 2003)A few comments are presented on IMD's model for forecasting mean seasonal rainfall for India in the context of its failure during 2002. From published data it is pointed out that seasonal (summer) rainfalls are normally ... -
Dominance of dinoflagellates in micro-zooplankton community in the oceanic regions of the Bay of Bengal and the Andaman Sea
(Indian Academy of Sciences, 2003)Studies on microzooplankton, phytoplankton biomass (chlorophyll a) and production were conducted at five oceanic stations in the Bay of Bengal and Andaman sea onboard FORV Sagar Sampada during intermonsoon (March 2001). ... -
The odds of a seismic source near Dwarka, NW Gujarat: An evaluation based on proxies
(Indian Academy of Sciences, 2003)The Kachchh–Saurashtra region is part of an old rift basin, featuring a number of linear structures, some of them holding potential for occasional M > 7 earthquakes. A challenging question is to identify probable sources ... -
Marine biodiversity and ecosystem functioning: A perspective
(Indian Academy of Sciences, 2003)Biodiversity and community structure are now recognized to be important determinants of ecosystem functioning. In this regard the marine ecosystem has been studied to a much lesser extent compared to the terrestrial. This ... -
Past 20,000-year history of Himalayan aridity: Evidence from oxygen isotope records in the Bay of Bengal
(Indian Academy of Sciences, 2003)Late Quaternary climate history of the Himalayas is inferred from sea surface salinity (SSS) changes determined from the oxygen isotope in planktonic foraminifers, in a turbidity-free, 14C-dated core from the Bay of Bengal. ... -
Evidence of fault reactivation off Pondicherry coast from marine geophysical data
(Indian Academy of Sciences, 2002)The present study mainly focuses on the northern part of the Cauvery offshore basin, between latitudes 10 degrees and 14 degrees N, and longitudes 80 degrees and 82 degrees E, over which the bathymetry, gravity and magnetic ... -
Origin of ash in the Central Indian Ocean Basin and its implication for the volume estimate of the 74,000 year BP Youngest Toba eruption
(Indian Academy of Sciences, 2002)A controversy exists about the origin of ash in the Central Indian Ocean Basin (CIOB). In situ silicic volcanism and Indonesian arc volcanism have been proposed as sources of ash in the basin. We present here the detailed ... -
Marine bioinvasion: Concern for ecology and shipping
(Indian Academy of Sciences, 2002)Marine bioinvasion - introduction of marine organisms alien to local ecosystem through ship hulls and ballast water - has serious consequences to native biota, fishery and general coastal ecosystem. Over 80% of the world ... -
Enhanced biological production off Chennai triggered by October 1999 super cyclone (Orissa)
(Indian Academy of Sciences, 2002)The results of physical forcings on primary production, its variation and associated hydrography of the southwestern Bay of Bengal during the southwest monsoon (July) and post-cyclone period (November) of 1999 were studied ... -
Indian marine bivalves: Potential source of antiviral drugs
(Indian Academy of Sciences, 2002)Extracts prepared from economically important marine bivalves such as green mussel (Perna viridis), estuarine oyster (Crassostrea madrasensis), giant oyster (Crassostrea gryphoides), estuarine clam (Meretrix casta), black ... -
Variations in nearshore processes along Nagapattinam coast, India
(Indian Academy of Sciences, 2002)Directional wave data collected at 10 m water depth, at 2 km distance off Nagore from March 1998 to February 1999, were used to estimate the longshore currents and longshore sediment transport rate considering the sea and ... -
Cultural sequence of Bet Dwarka Island based on thermoluminescence dating
(Indian Academy of Sciences, 2002)Earlier studies on the onshore and inter-tidal zone explorations in Bet Dwarka island had revealed the presence of a large number of potsherds and other antiquities that correspond to the protohistoric (2000-1500 BC), ... -
Geomorphological and petrological observations along a segment of slow-spreading Carlsberg Ridge
(Indian Academy of Sciences, 2002)A 120-km-long section of the Carlsberg Ridge has been mapped with multi-beam bathymetry system (MBS). High-resolution bathymetric contour map generated with the MBS data shows well-defined axial valley bordered by steep ... -
The plight of Indian sea horses: Need for conservation and management
(Indian Academy of Sciences, 2002)The increasing demand for seahorses in Asian traditional medicines, tonic food aphrodisiacs, as aquarium fishes, souvenirs and curios are concomitant with a decline in capture fisheries and destruction of habitats. The ... -
Role of nematodes as bioindicators in marine and freshwater habitats
(Indian Academy of Sciences, 2002)Nematodes as bioindicator of water quality and ecosystem function has been emphasized. The behaviour of a nematode parasite Rostellascaris sp. As a biological tag and useful discriminant of habitats and in fishery exploitation ... -
Geotechnical properties of siliceous sediments from the Central Indian Basin
(Indian Academy of Sciences, 2002)Indian Deep-Sea Environment Experiment (INDEX) was carried out in a pre-selected area with low nodule abundance and uniform sediment type, for the purpose of environmental impact assessment of future deep-sea mining ... -
Occurrence of pockmarks and gas seepages along the central western continental margin of India
(Indian Academy of Sciences, 2002)High-resolution seismic reflection profiling has revealed the occurrence of acoustic masking, pockmarks, gas seepages and plumes on the inner shelf, middle shelf and upper continental slope of western India, between 20 and ... -
A synthesis of sedimentary geochemical processes in and around Carlsberg Ridge
(Indian Academy of Sciences, 2001)The geochemical sedimentation processes active in and around the Carlsberg ridge area of the Indian Ocean have been synthesized. From the available information it is evident that hydrogenetic sedimentation process is most ...