Gruber, Nicolas , Clement, Dominic, Carter, Brendan R. , Feely, Richard A. , van Heuven, Steven , Hoppema, Mario , Ishii, Masao , Key, Robert M., Kozyr, Alex, Lauvset, Siv K., Lo Monaco, Claire , Mathis, Jeremy T. , Murata, Akihiko , Olsen, Are , Perez, Fiz F. , Sabine, Christopher L. , Tanhua, Toste and Wanninkhof, Rik (2019) The oceanic sink for anthropogenic CO2 from 1994 to 2007. Science, 363 (6432). pp. 1193-1199. DOI 10.1126/science.aau5153.

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Abstract

We quantify the oceanic sink for anthropogenic carbon dioxide (CO 2 ) over the period 1994 to 2007 by using observations from the global repeat hydrography program and contrasting them to observations from the 1990s. Using a linear regression–based method, we find a global increase in the anthropogenic CO 2 inventory of 34 ± 4 petagrams of carbon (Pg C) between 1994 and 2007. This is equivalent to an average uptake rate of 2.6 ± 0.3 Pg C year −1 and represents 31 ± 4% of the global anthropogenic CO 2 emissions over this period. Although this global ocean sink estimate is consistent with the expectation of the ocean uptake having increased in proportion to the rise in atmospheric CO 2 , substantial regional differences in storage rate are found, likely owing to climate variability–driven changes in ocean circulation.

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