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An intermediate nepheloid layer associated with high microbial metabolic rates and denitrification in the northwest Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title An intermediate nepheloid layer associated with high microbial metabolic rates and denitrification in the northwest Indian Ocean
 
Creator Naqvi, S.W.A.
DileepKumar, M.
Narvekar, P.V.
DeSousa, S.N.
George, M.D.
DeSilva, C.
 
Subject nepheloid layer
continental margins
offshore
denitrification
turbidity
carbon
bacteria
 
Description Extensive optical, physical chemical, and biochemical measurements made simultaneously in the northwest Indian Ocean reveal the occurrence of an intermediate nepheloid layer (INL) invariably associated with the secondary nitrite maximum. Maxima in particulate protein and the activity of the respiratory electron transport system (ETS) are also found within the INL. Since the INL persists long distances from the continental margin with an offshore intensification, it may not be related to the transport of material resuspended along the continental margin. An apparent correlation of the INL with the previously reported subsurface maximum in bacterial abundance suggests that a local increase in the abundance of bacteria may be responsible for the increased turbidity. positive correlations of the beam attenuation anomaly with nitrite and nitrate deficit suggest that most of these bacteria may be denitrifiers. The organic carbon demand within the denitrifying layer, computed from the observed ETS activity, appears to be severalfold higher than the sinkin carbon fluxes to thedenitrifying layer, requiring additional modes of supply of the biodegradable organic matter. It is proposed that a bacterial maximum could be maintained with efficient utilization of the dissolved organic matter within the denitrifying waters
 
Date 2009-05-06T11:06:27Z
2009-05-06T11:06:27Z
1993
 
Type Journal Article
 
Identifier Journal of Geophysical Research (C: Oceans), Vol.98; 16,469-16,479p.
http://drs.nio.org/drs/handle/2264/2877
 
Language en
 
Rights Copyright [1993]. 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 American Geophysical Union