Ocean acidification and marine trace gas emissions
- 22 December 2009
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 107 (2), 760-765
- https://doi.org/10.1073/pnas.0907163107
Abstract
The oceanic uptake of man-made CO(2) 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) Nature 425:365; The Royal Society (2005) Policy Document 12/05 (Royal Society, London)]. Here, we describe results showing how a doubling of current atmospheric CO(2) affects the production of a suite of atmospherically important marine trace gases. Two CO(2) treatments were used during a mesocosm CO(2) perturbation experiment in a Norwegian fjord (present day: approximately 380 ppmv and year 2100: approximately 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(2.) Additionally, large reductions in concentrations of other iodocarbons were observed. The response of bromocarbons to high CO(2) 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.Keywords
This publication has 33 references indexed in Scilit:
- Impact of anthropogenic atmospheric nitrogen and sulfur deposition on ocean acidification and the inorganic carbon systemProceedings of the National Academy of Sciences of the United States of America, 2007
- Unexpected consequences of increasing CO2 and ocean acidity on marine production of DMS and CH2ClI: Potential climate impactsGeophysical Research Letters, 2007
- Climate sensitivity to ocean dimethylsulphide emissionsGeophysical Research Letters, 2006
- Anthropogenic ocean acidification over the twenty-first century and its impact on calcifying organismsNature, 2005
- Air–sea exchange of halocarbons: the influence of diurnal and regional variations and distribution of pigmentsDeep Sea Research Part II: Topical Studies in Oceanography, 2004
- Production of methyl iodide in the tropical Atlantic OceanGeophysical Research Letters, 2004
- Biogenic iodine emissions and identification of end‐products in coastal ultrafine particles during nucleation burstsJournal of Geophysical Research: Atmospheres, 2002
- On the role of iodine in ozone depletionJournal of Geophysical Research: Solid Earth, 1994
- Photochemical production of methyl iodide in seawaterJournal of Geophysical Research: Atmospheres, 1994
- A comparison of the equilibrium constants for the dissociation of carbonic acid in seawater mediaDeep Sea Research Part A. Oceanographic Research Papers, 1987