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Indian contributions in the field of marine micropaleontology (2010-2015)

DRS at CSIR-National Institute of Oceanography

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Title Indian contributions in the field of marine micropaleontology (2010-2015)
 
Creator Singh, A.D.
Naidu, P.D.
Saraswat, R.
 
Subject Palaeo-studies
Palaeo-studies
Geology and geophysics
Palaeo-studies
 
Description An overview of the research contributions made during the last five years by the Indian scientists in the field of marine micropaleontology is presented. Large scale micropaleontological studies employing assemblages of various microfossil groups (mainly foraminifera, pteropods, ostracodes and nannoplanktons) and their geochemical proxies have been carried out on deep sea sediment cores from the Indian Ocean. These integrated studies provided better insights to our understanding of past changes in surface and deep ocean circulations on different time scales and their relationships to seasonal variations of monsoon climate. It was observed that the foraminiferal abundances and diversity in the Arabian Sea are mainly driven by the variation in monsoonal intensity. Within the present day oxygen minimum zone (OMZ), benthic diversity increased during the cold stadials when the monsoon circulation was weak, the productivity was low resulting to a weak OMZ. The enhanced inflow of Antarctic Intermediate Water (AAIW) ventilated the deep water column during this period. In the southern Bay of Bengal, the contribution of southern ocean deep water increased during the last glacial maximum, as compared to the Holocene with greater influence of North Atlantic Deep Water (NADW). For the first time boron isotope based pCO2 of seawater was reconstructed from the eastern Arabian Sea. The results obtained have major implications in understanding the effect of monsoon on the efficiency of carbon pump in geological records. Numerous studies have reconstructed the variability of the Indian monsoon by using several parameters suggest a significant spatial variability of the Indian monsoon rainfall triggered by natural and anthropogenic perturbations over different time scales
 
Date 2016-10-13T12:27:10Z
2016-10-13T12:27:10Z
2016
 
Type Journal Article
 
Identifier Proceedings of the Indian National Science Academy, vol.82(3); 2016; 663-673
http://drs.nio.org/drs/handle/2264/5022
 
Language en
 
Rights This is an open access article under © Indian National Science Academy 2016.
 
Publisher Indian National Science Academy