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Does carbonate ion control planktonic foraminifera shell calcification in upwelling regions?

DRS at CSIR-National Institute of Oceanography

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Title Does carbonate ion control planktonic foraminifera shell calcification in upwelling regions?
 
Creator Naik, S.S.
Godad, S.P.
Naidu, P.D.
 
Subject calcification
foraminifera
surface water
Globigerina bulloides
 
Description 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 understand whether shell weights truly reflect surface water [CO sup(=) sub(3)]. We utilize shell weights of Globigerina bulloides and Globigerinoides ruber in the size range of 300 to 355 mu m from a sediment core recovered from above the lysocline in the upwelling region of western Arabian Sea. Shell weights of G. ruber and G. bulloides show significant correlation with their shell size from recent to 16 kyr, which suggests that shell calcification was controlled by optimum growth conditions. On the other hand, during 16 to 22 kyr, there is no correlation between shell weights and shell size. However, shell weights of G. bulloides exhibit significant negative correlation with annual sea surface temperature which suggests that G. bulloides calcification might have been controlled by surface water [CO sup(=) sub(3)]. Therefore it is suggested here that shell weights of G. ruber and G. bulloides cannot be utilized to reconstruct surface water [CO sup(=) sub(3)] in this region.
 
Date 2011-12-08T07:37:35Z
2011-12-08T07:37:35Z
2011
 
Type Journal Article
 
Identifier Current Science, vol.101(10); 2011; 1370-1375
http://drs.nio.org/drs/handle/2264/3970
 
Language en
 
Rights Copyright [2011]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Current Science Association