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Oxygen isotope records of Globigerina bulloides across a north-south transect in the south-western Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Oxygen isotope records of Globigerina bulloides across a north-south transect in the south-western Indian Ocean
 
Creator Khare, N.
Chaturvedi, S.K.
Saraswat, R.
 
Subject palaeo studies
oxygen isotopes
oceanic fronts
foraminifera
 
Description Along a north-south transect (9.69 degrees N to 55.01 degrees S) in the southwestern Indian Ocean during the Indian Pilot Expedition to Southern Ocean (PESO), the oxygen isotopic analysis of planktic foraminifera (Globigerina bulloides) from 23 surface sediment samples was carried out to assess the relationship between isotopic composition of G. bulloides and the prevailing physical (seawater temperature and salinity) conditions of the ambient seawater. An increasing trend in the delta sup(18)O value is noticed towards higher latitude. Apparently such an increase in delta sup(18)O values is inversely related to the temperature changes along the transect. However, slight mismatch is observed at a few stations due to calcification out of optimum conditions or due to the salinity changes. The preliminary results of the present study, if extended to the subsurface sediments coupled with other parameters, may contribute to the reconstruction of the paleohydrography of the region, especially the position of various seawater fronts during the geologic past albeit with areal limitation
 
Date 2009-11-10T11:28:49Z
2009-11-10T11:28:49Z
2009
 
Type Journal Article
 
Identifier Ocean Science Journal, vol.44(2); 117-123
http://drs.nio.org/drs/handle/2264/3429
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D pupose and Copyright [2009] Springer.
 
Publisher Springer