Browsing Scholarly literature by Author "Naik, S.S."
Now showing items 1-20 of 41
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70 kyr record of denitrification and oxygenation changes in the eastern Arabian Sea
Godad, S.P.; Naik, S.S.; Naidu, P.D. (Geochemical Society of Japan, 2017)A 70 kyr record of ?15N from the eastern Arabian Sea, Core AAS9/21 was investigated. High ?15N values during interglacials and low ?15N values during glacials are documented, which mimics the global ?15N records in the ... -
A 16-kyr Record of Ocean Circulation and Monsoon Intensification From the Central Bay of Bengal
Naik, S.S.; Basak, C.; Goldstein, S.L.; Naidu, P.D.; Naik, S.N. (John Wiley & Sons, 2019)The monsoonal signal dominates most climate records from the Indian Ocean. As a consequence, conventional stable isotope tracers have not been effective at tracking ocean circulation in the Indian Ocean and distinguishing ... -
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 ... -
A comparison of Globigerinoides ruber calcification between upwelling and non-upwelling regions in the Arabian Sea
Naik, S.S.; Godad, S.P.; Naidu, P.D.; Ramaswamy, V. (Indian Academy of Sciences, 2013)Shell weights of planktonic foraminifera species Globigerinoides ruber in the size range of 300–355 mew m were measured from sediment traps in the western and eastern Arabian Sea which represent upwelling and non-upwelling ... -
A comparison of Mg/Ca ratios in Globigerinoides ruber (white): sensu stricto versus a mixture of genotypes
Naik, S.S. (Geological Society of India, 2016)Mg/Ca ratios were measured in core AAS9/21 from the eastern Arabian Sea (EAS), on two sets of planktonic foraminifera, one with a mixture of Globigerinoides ruber genotypes (sensu stricto and sensu lato) and the second ... -
A global synthesis of high-resolution stable isotope data from benthic foraminifera of the last deglaciation
Muglia, J.; Mulitza, S.; Repschlager, J.; Schmittner, A.; Lembke-Jene, L.; Lisiecki, L.; Mix, A.; Saraswat, R.; Sikes, E.; Waelbroeck, C.; Gottschalk, J.; Lippold, J.; Lund, D.; Martinez-Mendez, G.; Michel, E.; Muschitiello, F.; Naik, S.S.; Okazaki, Y.; Stott, L.; Voelker, A.; Zhao, N. (Nature Publishing Group, 2023)We present the first version of the Ocean Circulation and Carbon Cycling (OC3) working group database, of oxygen and carbon stable isotope ratios from benthic foraminifera in deep ocean sediment cores from the Last Glacial ... -
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 ... -
Bacterial response to contrasting geochemistry in the sediments of central Indian Ocean basin
Das, A.; Fernandes, C.E.G.; Naik, S.S.; Nath, B.N.; LokaBharathi, P.A. (Regional Research laboratory, Bhubaneswar, 2005)The latitudinal differences in geochemical and physiographic nature could evoke varied biological/microbiological response in the deep-sea benthic ecosystem of the Central Indian Ocean. Sediment cores have been examined ... -
Bacterial response to contrasting sediment geochemistry in the central Indian Basin
Das, A.; Fernandes, C.E.G.; Naik, S.S.; Nath, B.N.; Suresh, I.; Mascarenhas-Pereira, M.B.L.; Gupta, S.M.; Khadge, N.H.; PrakashBabu, C.; Borole, D.V.; Sujith, P.P.; Valsangkar, A.B.; Mourya, B.S.; Biche, S.U.; Sharma, R.; LokaBharathi, P.A. (International Association of Sedimentologists, 2011)In order to investigate whether geochemical, physiographic and lithological differences in two end-member sedimentary settings could evoke varied microbe-sediment interactions, two 25 cm long sediment cores from contrasting ... -
Boron/calcium ratios in Globigerinoides ruber from the Arabian Sea: Implications for controls on boron incorporation
Naik, S.S.; Naidu, P.D. (Elsevier, 2014)Culture and downcore studies have been used to argue that B/Ca ratios in planktic foraminifera are correlated with seawater pH and may record seawater borate/bicarbonate ratios, although other factors may also control B/Ca. ... -
Calcite dissolution along a transect in the western tropical Indian Ocean: A multiproxy approach
Naik, S.S.; Naidu, P.D. (American Geophysical Union, 2007)Three paleocarbonate ion proxies, size index, planktonic foraminifera shell weight, and calcite crystallinity, have been employed here to a set of core top samples from the western tropical Indian Ocean in the water depth ... -
Carbonate preservation during the 'mystery interval' in the northern Indian Ocean
Naik, S.S.; Naidu, P.D. (Terra Scientific Publishing Company, 2016)To understand carbonate dissolution and/or preservation on the sea floor since the Last Glacial Maximum (LGM), we measured shell weights of planktonic foraminifera Globigerinoides ruber from four sediment cores retrieved ... -
Contrasts in calcium carbonate dissolution above the lysocline in the equatorial Indian Ocean over the last ~40 ka
Yadav, Ramanand; Naik, S.S.; Naidu, P.D. (Elsevier, 2022)Understanding calcite dissolution above the lysocline is crucial to comprehend the oceanic calcium carbonate cycle. To understand past calcite dissolution in sediments from above the lysocline, we use multiple dissolution ... -
Coupling of thermocline depth and strength of the Indian summer monsoon during deglaciation
Naik, S.S.; Naidu, P.D. (Springer India, 2019)We investigated the variations in thermocline depth using the difference in δ18Oc values between the two species of planktonic foraminifera, surface dwelling Globigerinoides ruber (s.s.) and thermocline dwelling Neogloboqudrina ... -
Developing community-based scientific priorities and new drilling proposals in the southern Indian and southwestern Pacific oceans
Mckay, R.; Exon, N.; M�ller, D.; Gohl, K.; Gurnis, M.; Shevenell, A.; Henrys, S.; Inagaki, F.; Pandey, D.; Whiteside, J.; Van De Flierdt, T.; Naish, T.; Heuer, V.; Morono, Y.; Coffin, M.; Godard, M.; Wallace, L.; Kodaira, S.; Bijl, P.; Collot, J.; Dickens, G.; Dugan, B.; Dunlea, A.G.; Hackney, R.; Ikehara, M.; Jutzeler, M.; Mcneill, L.; Naik, S.S.; Noble, T.; Opdyke, B.; Pecher, I.; Stott, L.; Uenzelmann-Neben, G.; Yatheesh, V.; Wortmann, U.G. (Copernicus Gesellschaft MBH, Gottingen, Germany, 2018)An International Ocean Discovery Program (IODP) workshop was held at Sydney University, Aus-tralia, from 13 to 16 June 2017 and was attended by 97 scientists from 12 countries. The aim of the workshop was to investigate ... -
Does carbonate ion control planktonic foraminifera shell calcification in upwelling regions?
Naik, S.S.; Godad, S.P.; Naidu, P.D. (Current Science Association, 2011)Planktonic foraminifera shell weights have been recognized as possible proxy for surface water carbonate ion concentration [CO sup(=) sub(3)] and atmospheric CO sub(2). However, to utilize this proxy, it is important to ... -
Early- to late-Holocene contrast in productivity, OMZ intensity and calcite dissolution in the eastern Arabian Sea
Naik, S.S.; Godad, S.P.; Naidu, P.D.; Tiwari, M.; Paropkari, A.L. (SAGE Publications, 2014)The Oxygen Minimum Zone (OMZ) is a potential source of CO<sup>2</sup> to the atmosphere, and the extensive OMZ spread to 1.37 × 10<sup>6</sup> km<sup>2</sup> in the Northern Arabian Sea would be an important contributor ... -
Eastern Arabian Sea CO2 outgassing during the last deglaciation and Holocene related to deep-water carbonate chemistry
Naik, S.N.; Naik, S.S.; Rosenthal, Y.; Clementi, V. (Elsevier, 2023)Glacial to interglacial changes in atmospheric CO2 are an intriguing part of carbon reorganization in the climate system and are estimated by investigating deep-water carbonate ion concentrations ([CO32−]). The scarcity ... -
Effect of varying frontal systems on stable oxygen and carbon isotopic compositions of modern planktic foraminifera of Southern Ocean
Tiwari, M.; Mohan, R.; Meloth, T.; Naik, S.S.; Sudhakar, M. (Current Science Association, 2011)Studies have been carried out in the Atlantic and Pacific sectors of the Southern Ocean regarding the movement of its fronts (water-masses boundaries) with changing climate and other oceanic parameters. But the Indian ... -
Evaluation of the CaCO3 dissolution proxies in sediment cores from above the lysocline
Naik, S.S.; Naidu, P.D. (Elsevier, 2010)Calcium carbonate analyses were carried out from two size fractions (less than 63 mu m and more than 63 mu m) from the Ocean Drilling Program Sites 752 and 715 collected from above the lysocline depth in the Indian Ocean, ...