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Unexpected consequences of increasing CO2 and ocean acidity on marine production of DMS and CH2ClI: Potential climate impacts
Geophysical Research Center and Department of Chemistry, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
Geophysical Research Center and Department of Chemistry, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
Geophysical Research Center and Department of Chemistry, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
Department of Chemistry, University of California, Irvine, California, USA
Department of Chemistry, University of California, Irvine, California, USA
Climate Change Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, New Hampshire, USA
Institute for Biology, University of Bergen, Bergen, Norway
Institute for Biology, University of Bergen, Bergen, Norway
Institute for Biology, University of Bergen, Bergen, Norway
Leibniz Institute for Marine Sciences at University of Kiel, Kiel, Germany
Leibniz Institute for Marine Sciences at University of Kiel, Kiel, Germany
Leibniz Institute for Marine Sciences at University of Kiel, Kiel, Germany
Increasing atmospheric mixing ratios of CO2 have already lowered surface ocean pH by 0.1 units compared to preindustrial values and pH is expected to decrease an additional 0.3 units by the end of this century. Pronounced physiological changes in some phytoplankton have been observed during previous CO2 perturbation experiments. Marine microorganisms are known to consume and produce climate-relevant organic gases. Concentrations of (CH3)2S (DMS) and CH2ClI were quantified during the Third Pelagic Ecosystem CO2 Enrichment Study. Positive feedbacks were observed between control mesocosms and those simulating future CO2. Dimethyl sulfide was 26% (±10%) greater than the controls in the 2x ambient CO2 treatments, and 18% (±10%) higher in the 3xCO2 mesocosms. For CH2ClI the 2xCO2 treatments were 46% (±4%) greater than the controls and the 3xCO2 mesocosms were 131% (±11%) higher. These processes may help contribute to the homeostasis of the planet.
Received 2 October 2006; accepted 6 February 2007; published 7 March 2007.
Citation: (2007), Unexpected consequences of increasing CO2 and ocean acidity on marine production of DMS and CH2ClI: Potential climate impacts, Geophys. Res. Lett., 34, L05710, doi:10.1029/2006GL028139.
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