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Denitrification processes in the Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Denitrification processes in the Arabian Sea
 
Creator Naqvi, S.W.A.
 
Contributor Lal, D.
 
Subject Chemistry and Biogeochemistry
denitrification
nitrogen cycle
organic matter
ISW, Arabian Sea
 
Description Special Issue: Biogeochemistry of the Arabian Sea: Present information and gaps
Recent information on some consequences of the acute mid-water oxygen deficiency in the Arabian Sea, especially on carbon-nitrogen cycling, is reviewed. An evaluation of published estimates of water column denitrification rate suggests an overall rate in the vicinity of 30 Tg Ny@u-1@@, but the extent of benthic contribution remains unknown. A decoupling of denitrification from primary production, unique to the Arabian Sea, is revealed by nitrite, Electron Transport System (ETS) activity and bacterial production data. Results of both enzymatic and microbiological investigations strongly point to a major role of organic carbon other than that sinking from surface layers in supporting denitrification. Although denitrification is associated with an intermediate nepheloid layer, it seems unlikely that the excess carbon comes with particles re-suspended along the continental margins and transported quasi-horizontally into the ocean interior, instead, the particle maximum may directly reflect a higher bacterial abundance. It is proposed that denitrification may be predominantly fuelled by the dissolved organic matter
 
Date 1995-01-17T10:06:29Z
2017-09-30T02:52:23Z
1995-01-17T10:06:29Z
2017-09-30T02:52:23Z
1994
 
Type Journal Article
 
Identifier Proceedings of the Indian Academy of Sciences (Earth and Planetary Sciences), vol.103(2); 1994; 279-300
0253-4126
http://drs.nio.org/drs/handle/2264/7495
 
Language en
 
Relation P Indian As-Earth
SCI
 
Publisher Indian Academy of Sciences, Bangalore