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Oxygen isotopic analyses of individual planktic foraminifera species: Implications for seasonality in the western Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Oxygen isotopic analyses of individual planktic foraminifera species: Implications for seasonality in the western Arabian Sea
 
Creator Naidu, P.D.
Niitsuma, N.
Naik, S.S.
 
Subject PALAEO-STUDIES
GEOLOGY AND GEOPHYSICS
AQUATIC ECOLOGY, PRODUCTIVITY
METEOROLOGY AND CLIMATOLOGY
PALAEO-STUDIES
 
Description The variation of stable isotopes between individual shells of planktic foraminifera of a given species and size may provide short-term seasonal insight on Paleoceanography. In this context, oxygen isotope analyses of individual Globigerinoides sacculifer and Neogloboquadrina dutertrei were carried out from the Ocean Drilling Program Site 723A in the western Arabian Sea to unravel the seasonal changes for the last 22 kyr. delta 18O values of single shells of G. sacculifer range from of 0.54 to 2.09‰ at various depths in the core which cover a time span of the last 22 kyr. Maximum inter-shell delta 18O variability and high standard deviation is noticed from 20 to 10 kyr, whereas from 10 kyr onwards the inter shell delta 18O variability decreased. The individual contribution of sea surface temperature (SST) and sea surface salinity (SSS) on the inter shell delta 18O values of G. sacculifer were quantified. Maximum seasonal SST between 20 and 14 ka was caused due to weak summer monsoon upwelling and strong cold winter arid continental winds. Maximum SSS differences between 18 and 10 ka is attributed to the increase of net evaporation minus precipitation due to the shift of ITCZ further south. Overall, winter dominated SST signal in Greenland would be responsible to make a teleconnection between Indian monsoon and Greenland temperature. Thus the present study has wider implications in understanding wether the forcing mechanisms of tropical monsoon climate lies in high latitudes or in the tropics
 
Date 2016-03-18T09:48:05Z
2016-03-18T09:48:05Z
2014
 
Type Journal Article
 
Identifier Climate of the Past Discussions, vol.10; 2014; 3661-3688
http://drs.nio.org/drs/handle/2264/4936
 
Language en
 
Rights © Author(s) 2014. CC Attribution 3.0 License (CC BY-NC-SA 3.0)
 
Publisher Copernicus Publications