I am attending a meeting of the Carbon Cycle Science Steering Group (CCSSG). We are a group of scientists who advise the Carbon Cycle Interagency Working Group (CCIWG), a body of program managers from several agencies that fund carbon cycle science. We are having a briefing this afternoon about ocean carbon cycling and I have two pieces of information.
First, in response to the question last week, the ability of CO2 to dissolve in water is lower at warmer temperatures (see figure at bottom of this post). So, as it gets warmer, we might expect the net flux of CO2 into the ocean to decrease. A speaker here just mentioned two recent papers (Khatiwal et al. 2013; Wanninkhof et al. 2013) that have investigated this. The papers suggest that this has been happening.
Second, another recent paper published in Nature Geoscience (Regnier et al. 2013) suggests that human activities have substantially increased fluxes of C from the terrestrial biosphere to the oceans as dissolved inorganic carbon. Here is a summary figure:
Khatiwala, S., T. Tanhua, S. M. Fletcher, M. Gerber, S. C. Doney, H. D. Graven, N. Gruber, G. A. McKinley, A. Murata, A. F. Rios, and C. L. Sabine. 2013. Global ocean storage of anthropogenic carbon. Biogeosciences 10:2169-2191.
Wanninkhof, R., G. H. Park, T. Takahashi, C. Sweeney, R. Feely, Y. Nojiri, N. Gruber, S. C. Doney, G. A. McKinley, A. Lenton, C. Le Quere, C. Heinze, J. Schwinger, H. Graven, and S. Khatiwala. 2013. Global ocean carbon uptake: magnitude, variability and trends. Biogeosciences 10:1983-2000.
First, in response to the question last week, the ability of CO2 to dissolve in water is lower at warmer temperatures (see figure at bottom of this post). So, as it gets warmer, we might expect the net flux of CO2 into the ocean to decrease. A speaker here just mentioned two recent papers (Khatiwal et al. 2013; Wanninkhof et al. 2013) that have investigated this. The papers suggest that this has been happening.
Second, another recent paper published in Nature Geoscience (Regnier et al. 2013) suggests that human activities have substantially increased fluxes of C from the terrestrial biosphere to the oceans as dissolved inorganic carbon. Here is a summary figure:
Khatiwala, S., T. Tanhua, S. M. Fletcher, M. Gerber, S. C. Doney, H. D. Graven, N. Gruber, G. A. McKinley, A. Murata, A. F. Rios, and C. L. Sabine. 2013. Global ocean storage of anthropogenic carbon. Biogeosciences 10:2169-2191.
Wanninkhof, R., G. H. Park, T. Takahashi, C. Sweeney, R. Feely, Y. Nojiri, N. Gruber, S. C. Doney, G. A. McKinley, A. Lenton, C. Le Quere, C. Heinze, J. Schwinger, H. Graven, and S. Khatiwala. 2013. Global ocean carbon uptake: magnitude, variability and trends. Biogeosciences 10:1983-2000.
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