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Intensified oxygen minimum zone on the western shelf of Bay of Bengal during summer monsoon: Influence of river discharge

DRS at CSIR-National Institute of Oceanography

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Title Intensified oxygen minimum zone on the western shelf of Bay of Bengal during summer monsoon: Influence of river discharge
 
Creator Sarma, V.V.S.S.
Krishna, M.S.
Viswanadham, R.
Rao, G.D.
Rao, V.D.
Sridevi, B.
Kumar, B.S.K.
Prasad, V.R.
Subbaiah, Ch.V.
Acharyya, T.
Bandopadhyay, D.
 
Subject oxygen minimum layer
river discharge
stratification
phytoplankton
 
Description A study on biogeochemical cycling in the west coastal Bay of Bengal was undertaken during the peak discharge period to understand the influence of enhanced stratification and primary production on the possible intensification of the oxygen minimum zone (OMZ). Our study reveals that oxygen concentrations were below the detection limits in the northwestern (NW) coastal Bay of Bengal between 100 and 500 m associated with strong stratification and high phytoplankton biomass. Such low oxygen concentrations have never been reported so far from the coastal Bay of Bengal. Despite the existence of an environment conducive to denitrification in the coastal Bay of Bengal, accumulation of neither secondary nitrite nor nitrous oxide (N sub(2)O) was observed. The absence of denitrification was reported to be caused by faster scavenging of organic matter and low bacterial respiration rates; in contrast, our results suggest that neither of these factors are potential reasons for the absence of denitrification in the coastal Bay of Bengal.
 
Date 2013-03-05T07:30:45Z
2013-03-05T07:30:45Z
2013
 
Type Journal Article
 
Identifier Journal of Oceanography, vol.69(1); 2013; 45-55
no
http://drs.nio.org/drs/handle/2264/4260
 
Language en
 
Relation J_Oceanogr_69_45.jpg
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2012] Springer.
 
Publisher Springer