A5075731458- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Geological formations and processes
- Marine and environmental studies
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Geological and Geophysical Studies
- Pleistocene-Era Hominins and Archaeology
- Oceanographic and Atmospheric Processes
- earthquake and tectonic studies
- Paleontology and Stratigraphy of Fossils
- Maritime and Coastal Archaeology
- Marine and fisheries research
- Pacific and Southeast Asian Studies
- Geomagnetism and Paleomagnetism Studies
- Archaeology and ancient environmental studies
- Coastal wetland ecosystem dynamics
- Mercury impact and mitigation studies
- Hydrocarbon exploration and reservoir analysis
- Cryospheric studies and observations
- Seismic Imaging and Inversion Techniques
- Geochemistry and Elemental Analysis
- Geophysics and Gravity Measurements
- Drilling and Well Engineering
National Institute of Oceanography
2015-2024
Indian Institute of Science Bangalore
2023
Santa Paula Hospital
2009
Centre of Advanced Studies
2008
University of Delhi
2008
American Dairy Science Association
1974
Cambridge University Press
1974
Bentley (Germany)
1974
Abstract In the Arabian Sea, South Asian monsoon (SAM)-induced high surface water productivity coupled with poor ventilation of intermediate results in strong denitrification within oxygen minimum zone (OMZ). Despite significance we have no long-term record its evolution spanning past several million years. Here, present first since Late Miocene (~10.2 Ma) Eastern where SAM generates moderate productivity, based on samples retrieved during International Ocean Discovery Program (IODP)...
Sea surface temperature (SST) for the central equatorial Indian Ocean, has been reconstructed over last ∼137 kyr, from Mg/Ca of planktonic foraminiferal species Globigerinoides ruber . According to our record Ocean SST was ∼2.1°C colder during glacial maximum as compared present times. The data further shows that comparatively warmer isotopic stage 5e than at (∼29.9 vs ∼28.5°C). Comparison with Antarctic δD and Greenland δ 18 O records, major high‐latitude cooling/warming events are also in...
Abstract We present the first version of Ocean Circulation and Carbon Cycling (OC3) working group database, oxygen carbon stable isotope ratios from benthic foraminifera in deep ocean sediment cores Last Glacial Maximum (LGM, 23-19 ky) to Holocene (<10 with a particular focus on early last deglaciation (19-15 ky BP). It includes 287 globally distributed coring sites, metadata, isotopic chronostratigraphic information, age models. A quality check was performed for all data models, sites at...
Among the most important environments of coastal zone are estuaries where fresh water from land mixes with sea creating one biologically productive regions on earth. A wide range human activities affect and endanger their biodiversity due to unchecked development in many areas across world. large fluctuation is observed pH different parts estuaries. In view ocean acidification, it delineate tolerance organisms thriving this study, we assess effect distribution diversity benthic foraminifera...
Abstract. Data on marine microfossil assemblage composition have multiple applications. Initially, they were primarily used for (chrono)stratigraphy and palaeoecology, but these data are now also widely to study evolutionary ecological processes, such as past biodiversity its links with environmental dynamics, or provide a basis conservation efforts biomonitoring. The large range of potential applications renders abundance ideal reuse. However, the complexity inherent in taxonomic data,...
Live specimens of benthic foraminiferal species Rosalina leei were subjected to a combination temperature (25°C, 30°C and 35°C) salinity (25‰, 30‰ 35‰) assess its differential response the annual range seawater reported at sampling site. A total 216 used for experiment. Within salinity, which R. as part present experiment, growth increased with increasing whereas increase in resulted retarded growth. Maximum was kept 25°C 35‰ while rest maintained 25‰ saline water, showed comparatively less...
Abstract Paired stable oxygen isotope and Mg/Ca analyses in calcite tests of the mixed‐layer‐dwelling planktic foraminifer Globigerinoides ruber has been used to reconstruct equatorial Indian Ocean δ 18 O seawater (δ sw ) over last ∼137 thousand years. On basis ice‐volume‐corrected sw–ivc ), relative changes sea surface salinity (SSS) have estimated. The SSS estimates suggest three episodes higher (131–113 years before present (kyr BP), 62–58 kyr BP, 30–24 BP) within glacial period as...
Abstract We reconstruct centennial scale quantitative changes in surface seawater temperature (SST), evaporation-precipitation (from Mg/Ca and δ 18 O of dwelling planktic foraminifera), productivity relative abundance Globigerina bulloides ), carbon burial %CaCO 3 organic [%C org ]) dissolved oxygen at sediment-water interface, covering the entire Holocene, from a core collected eastern Arabian Sea. From multi-proxy record, we define timing, consequences possible causes mid-Holocene climate...
Abstract International Ocean Discovery Program Expedition 355 drilled Sites U1456 and U1457 in Laxmi Basin (eastern Arabian Sea) to document the impact of South Asian monsoon on weathering erosion Himalaya. We revised chronostratigraphic framework for these sites using a combination biostratigraphy, magnetostratigraphy strontium isotope stratigraphy. The sedimentary section at two is similar we divided it into six units bounded by unconformities or emplaced as mass-transport deposit (MTD)....