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First assessment of water and carbon cycles in two tropical coastal rivers of south-west India: an isotopic approach

Tripti, Mondal and Lambs, Luc and Otto, Thierry and Gurumurthy, G. P. and Teisserenc, Roman and Moussa, Issam and Balakrishna, Keshava and Probst, Jean-Luc First assessment of water and carbon cycles in two tropical coastal rivers of south-west India: an isotopic approach. (2013) Rapid Communications in Mass Spectrometry, 27 (15). 1681-1689. ISSN 0951-4198

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Official URL: http://dx.doi.org/10.1002/rcm.6616

Abstract

Fluvial systems play a distinct role in monitoring the global carbon budget in the biosphere, because they not only act as the carbon carriers from the terrestrial source to the marine environment, but also stimulate various in situ processes that could significantly affect the carbon content. The carbon concentration, including its form, could be altered by natural processes such as gas exchange with the atmosphere (particularly the degassing of CO2), storage as river-bottom sediments (by microbial degradation of organic matter) and higher plankton production mainly by anthropogenic activities leading to higher nutrient input from sources such as agricultural land, domestic sewage and industry. In freshwater river systems, dissolved organic carbon (DOC), mainly originating from plant decomposition, is a very dynamic and reactive fraction of the whole carbon cycle on Earth. In contrast, the dissolved inorganic carbon (DIC) is derived from atmospheric CO2 through weathering of silicate and carbonate rock, and soil organic matter consumption. To determine the sources of inorganic carbon in river water, it is essential to estimate the amount of CO2 consumed from the atmosphere during rock weathering and to understand the biogeochemical cycling of carbon. One of the more reliable methods adopted to understand the different sources of DIC in rivers is the measurement of carbon isotopes in DIC,because the fractionation factors between the different carbonate species in dissolved river water and gaseous CO2 are well established.[1–3] The stable isotope ratios of oxygen (d18O values) and hydrogen (d2Η values) in river water are well established for determining the sources of these waters in the river basins. This would also determine the signatures of carbon in the river water accurately.

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The definitive version is available at http://onlinelibrary.wiley.com/doi/10.1002/rcm.6616/abstract
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Manipal University (INDIA)
Laboratory name:
Funders:
European Commission - CNRS-INEE PICS project - Manipal Centre for European Studies (MCES)
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Deposited By: Jean-luc PROBST
Deposited On:08 Jul 2013 12:39

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