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Anaerobic carbon mineralisation through sulphate reduction in the inner shelf sediments of eastern Arabian sea

DRS at CSIR-National Institute of Oceanography

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Title Anaerobic carbon mineralisation through sulphate reduction in the inner shelf sediments of eastern Arabian sea
 
Creator Naik, R.
Naqvi, S.W.A.
Araujo, J.
 
Subject Geology and geophysics
Chemistry and biogeochemistry
Geology and geophysics
 
Description Monsoon-induced coastal upwelling, land run-off, benthic and atmospheric inputs make the western Indian shelf waters biologically productive that is expected to lead to high rates of mineralisation of organic matter (OM) in the sediments. Dissimilatory sulphate reduction (SR) is a major pathway of OM mineralisation in near-shore marine sediments owing to depletion of other energetically more profitable electron acceptors (O2, NO3-, Mn and Fe oxides) within few millimetres of the sediment-water interface. We carried out first ever study to quantify SR rates in the inner shelf sediments off Goa (central west coast of India) using the 35S radiotracer technique. The highest rates were recorded in the upper 10 cm of the sediment cores and decreased gradually thereafter below detection. Despite significant SR activity in the upper ~12 to 21 cm at most of the sites, pore water sulphate concentrations generally did not show much variation with depth. The depth integrated SR rate (0.066-0.46 mol m-2 year-1) decreased with increasing water depth. Free sulphide was present in low concentrations (0-3 Mu M) in pore waters at shallow stations (depth
 
Date 2017-03-01T08:56:15Z
2017-03-01T08:56:15Z
2017
 
Type Journal Article
 
Identifier Estuar. Coast., vol.40(1); 2017; 134-144
yes
http://drs.nio.org/drs/handle/2264/5078
 
Language en
 
Relation Estuar_Coast_40_134.jpg
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2016] Springer.
 
Publisher Springer