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Methane and nitrous oxide fluxes in the polluted Adyar River and estuary, SE India

Lookup NU author(s): Dr Jonathan Barnes, Professor Robert Upstill-GoddardORCiD


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We measured dissolved N2O, CH4, O-2, NH4+, NO3- and NO2- on 7 transects along the polluted Adyar River-estuary, SE India and estimated N2O and CH4 emissions using a gas exchange relation and a floating chamber. High NO2- implied some nitrification of a large anthropogenic NH4+ pool. In the lower catchment CH4 was maximal (6.3+/-4.3 x 10(4) nM), exceeding the ebullition threshold, whereas strong undersaturation of N2O and O-2 implied intense denitrification. Emissions fluxes for the whole Adyar system similar to 2.5 x 10(8) g CH4 yr(-1) and similar to 2.4 x 10(6) g N2O yr(-1) estimated with a gas exchange relation and similar to 2 x 10(9) g CH4 yr(-1) derived with a floating chamber illustrate the importance of CH4 ebullition. An equivalent CO2 flux similar to 1-10 x 10(10) g yr(-1) derived using global warming potentials is equivalent to total Chennai motor vehicle CO2 emissions in one month. Studies such as this may inform More effective waste management and future compliance with international emissions agreements. (C) 2008 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Rajkumar AN, Barnes J, Ramesh R, Purvaja R, Upstill-Goddard RC

Publication type: Article

Publication status: Published

Journal: Marine Pollution Bulletin

Year: 2008

Volume: 56

Issue: 12

Pages: 2043-2051

ISSN (print): 0025-326X

ISSN (electronic): 1879-3363

Publisher: Elsevier Ltd


DOI: 10.1016/j.marpolbul.2008.08.005


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