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Carbon and oxygen isotope time series records of planktonic and benthic foraminifera from the Arabian Sea: Implications on upwelling processes

DRS at CSIR-National Institute of Oceanography

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Title Carbon and oxygen isotope time series records of planktonic and benthic foraminifera from the Arabian Sea: Implications on upwelling processes
 
Creator Naidu, P.D.
Niitsuma, N.
 
Subject carbon isotopes
oxygen isotopes
palaeo studies
foraminifera
upwelling
palaeoclimate
radiocarbon dating
 
Description Oxygen and carbon isotopic analyses have been performed on the tests of Globigerina bulloides and Pulleniatina obliquiloculata (planktonic foraminifera) and Uvigerina excellens (benthic foraminifer) to study the evolution of surface and bottom water hydrographic changes associated with summer monsoon upwelling process at the Oman Margin over the last 19 kyr. G. bulloides, P. obliquiloculata and U. excellens show sharp depleted delta super(18)O excursions around 9 ka, ascribed to the distribution of melt water flux of Termination IB in this region. A synchronous delta super(18)O shift in surface, subsurface and bottom water-living foraminifera around 9 ka reveals a rapid transfer of the Termination IB signal through the vertical circulation of the Arabian Sea in response to peak monsoon intensity. A steep increase in delta super(13)C values of U. excellens between 9 and 8 ka reveals advection of Red Sea intermediate water into the Arabian Sea during peak monsoon intensity. For the first time a drastic climatic shift at approx. 4 ka is noticed in the Arabian Sea as evidenced by the lowest delta super(18)O values of both P. obliquiloculata (-1.10 ppt) and G. bulloides (-2.29 ppt). This points to reduced upwelling strength. Both planktonic foraminifer speciesdelta super(18)O records suggest the establishment of modern surface water conditions after 3 ka at the Oman Margin.
 
Date 2008-07-18T05:45:17Z
2008-07-18T05:45:17Z
2003
 
Type Journal Article
 
Identifier Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.202; 85-95p.
http://drs.nio.org/drs/handle/2264/1253
 
Language en
 
Rights Copyright [2003]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher Elsevier