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A global estimate of the full oceanic 13 C Suess effect since the preindustrial
Author(s) -
Eide Marie,
Olsen Are,
Ninnemann Ulysses S.,
Eldevik Tor
Publication year - 2017
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1002/2016gb005472
Subject(s) - ocean gyre , oceanography , northern hemisphere , environmental science , subtropics , water mass , geology , climatology , atmospheric sciences , fishery , biology
Abstract We present the first estimate of the full global ocean 13 C Suess effect since preindustrial times, based on observations. This has been derived by first using the method of Olsen and Ninnemann (2010) to calculate 13 C Suess effect estimates on sections spanning the world ocean, which were next mapped on a global 1° × 1° grid. We find a strong 13 C Suess effect in the upper 1000 m of all basins, with strongest decrease in the subtropical gyres of the Northern Hemisphere, where δ 13 C of dissolved inorganic carbon has decreased by more than 0.8‰ since the industrial revolution. At greater depths, a significant 13 C Suess effect can only be detected in the northern parts of the North Atlantic Ocean. The relationship between the 13 C Suess effect and the concentration of anthropogenic carbon varies strongly between water masses, reflecting the degree to which source waters are equilibrated with the atmospheric 13 C Suess effect before sinking. Finally, we estimate a global ocean inventory of anthropogenic CO 2 of 92 ± 46 Gt C. This provides an estimate that is almost independent of and consistent, within the uncertainties, with previous estimates.