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Impact of atmospheric and physical forcings on biogeochemical cycling of dissolved oxygen and nutrients in the coastal Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Impact of atmospheric and physical forcings on biogeochemical cycling of dissolved oxygen and nutrients in the coastal Bay of Bengal
 
Creator Sarma, V.V.S.S.
Sridevi, B.
Maneesha, K.
Sridevi, T.
Naidu, S.A.
Prasad, V.R.
Venkataramana, V.
Acharya, T.
Bharati, M.D.
Subbaiah, C.V.
Kiran, B.S.
Reddy, N.P.C.
Sarma, V.V.
Sadhuram, Y.
Murty, T.V.R.
 
Subject dissolved oxygen
nutrient cycles
salinity
seasonal variations
water mixing
circulation
 
Description Time-series observations were conducted off Visakhapatnam, central west coast of Bay of Bengal, from October 2007 to April 2009 to examine the influence of physical and atmospheric processes on water column nutrients biogeochemistry. The thermal structure displayed inversions of 0.5 to 1.0 degrees C during winter and were weaker in summer. The water column was vertically stratified during the entire study period and was stronger during October-November 2007 and August-December 2008 compared to other study periods. High concentrations of chlorophyll-a and nutrients were associated with the extreme atmospheric events. The strong relationship of nutrients with salinity indicates that physical processes, such as circulation, mixing and river discharge, have a significant control on phytoplankton blooms in the coastal Bay of Bengal. Phosphate seems to be a controlling nutrient during winter whereas availability of light and suspended matter limits production in summer. Formation of low oxygen conditions were observed in the bottom waters due to enhanced primary production by extreme atmospheric events; however, re-oxygenation of bottom waters through sinking of oxygen-rich surface waters by a warm core (anticyclonic) eddy led to its near recovery. This study reveals that atmospheric and physical processes have significant impacts on the water column biogeochemistry in the coastal Bay of Bengal.
 
Date 2013-04-25T12:09:15Z
2013-04-25T12:09:15Z
2013
 
Type Journal Article
 
Identifier Journal of Oceanography, vol.69(2); 2013; 229-243
http://drs.nio.org/drs/handle/2264/4286
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and ©The Oceanographic Society of Japan and Springer Japan 2013
 
Publisher Springer