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Ocean acidification and marine trace gas emissions

Hopkins, Frances E and Turner, Suzanne M and Nightingale, Philip D and Steinke, Michael and Bakker, Dorothee and Liss, Peter S (2010) 'Ocean acidification and marine trace gas emissions.' Proceedings of the National Academy of Sciences, 107 (2). pp. 760-765. ISSN 0027-8424

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Abstract

<jats:p> The oceanic uptake of man-made CO <jats:sub>2</jats:sub> emissions is resulting in a measureable decrease in the pH of the surface oceans, a process which is predicted to have severe consequences for marine biological and biogeochemical processes [Caldeira K, Wickett ME (2003) <jats:italic>Nature</jats:italic> 425:365; The Royal Society (2005) <jats:italic>Policy Document 12/05</jats:italic> (Royal Society, London)]. Here, we describe results showing how a doubling of current atmospheric CO <jats:sub>2</jats:sub> affects the production of a suite of atmospherically important marine trace gases. Two CO <jats:sub>2</jats:sub> treatments were used during a mesocosm CO <jats:sub>2</jats:sub> perturbation experiment in a Norwegian fjord (present day: ∼380 ppmv and year 2100: ∼750 ppmv), and phytoplankton blooms were stimulated by the addition of nutrients. Seawater trace gas concentrations were monitored over the growth and decline of the blooms, revealing that concentrations of methyl iodide and dimethylsulfide were significantly reduced under high CO <jats:sub>2.</jats:sub> Additionally, large reductions in concentrations of other iodocarbons were observed. The response of bromocarbons to high CO <jats:sub>2</jats:sub> was less clear cut. Further research is now required to understand how ocean acidification might impact on global marine trace gas fluxes and how these impacts might feed through to changes in the earth's future climate and atmospheric chemistry. </jats:p>

Item Type: Article
Uncontrolled Keywords: dimethylsulfide; halocarbons; atmospheric chemistry; climate
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 09 Oct 2011 07:21
Last Modified: 14 Mar 2022 18:18
URI: http://repository.essex.ac.uk/id/eprint/979

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