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Influence of the upwelling events on the delta super(13)C and delta super(18)O of the benthic bivalve shells of the South Western Continental Margin of India
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Influence of the upwelling events on the delta super(13)C and delta super(18)O of the benthic bivalve shells of the South Western Continental Margin of India
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Influence of the upwelling events on the delta super(13)C and delta super(18)O of the benthic bivalve shells of the South Western Continental Margin of India
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Journal Article
Influence of the upwelling events on the delta super(13)C and delta super(18)O of the benthic bivalve shells of the South Western Continental Margin of India
2016
Overview
In this study, the influence of the spatial and temporal variability of upwelling intensity and the associated biological productivity observed during different phases of summer monsoon along the southwestern continental margin of India (SWCMI) on the delta super(13)C and delta super(18)O of the inorganic biogenic carbonate shells was investigated. Multispecies benthic bivalve shells (1-5 mm) separated from ten surface sediment samples of SWCMI (off 12 degree N, 10 degree N and 9 degree N) collected during the onset (OSM) and peak (PSM) phase of the summer monsoon of 2009 were analysed for delta super(13)C and delta super(18)O. Sea surface temperature along the study region indicates prominent upwelling in PSM than in OSM. A comparison of analytical and predicted values for delta super(18)O in the bivalve shells confirmed their in situ origin during both the sampling periods. During PSM, the delta super(13)C values in the benthic bivalve shells were more depleted in super(13)C than during OSM which recorded lower values of delta super(13)C in dissolved inorganic carbon of bottom waters expected in the study region in PSM due to the upwelled waters, high surface productivity and the associated high degradation of the organic matter in the subsurface and bottom waters. However, this depletion of delta super(13)C was not observed in benthic bivalve shells obtained from 10 degree N, since it is influenced by high export fluxes of carbon from the Cochin estuary since early monsoon months.
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