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Anthropogenic CO2 accumulation rates in the North Atlantic Ocean from changes in the 13C/12C of dissolved inorganic carbon

AuthorsQuay, P.; Sonnerup, R.; Stutsman, J.; Maurer, J.; Körtzinger, Arne; Padín, X. A. ; Robinson, Carol
Issue Date2007
PublisherAmerican Geophysical Union
CitationGlobal Biogeochemical Cycles 21: GB1009 (2007)
AbstractThe anthropogenic CO2 accumulation rate for the North Atlantic Ocean was estimated on the basis of the decrease in the δ 13C of the dissolved inorganic carbon measured between cruises in 1981 (Transient Tracers in the North Atlantic), 1993 (OACES) and 2003 (Repeat Hydrography). A mean depth-integrated δ 13C change of −15.0 ± 3.8‰ m yr−1 was estimated by applying a multiple linear regression approach to determine the anthropogenic δ 13C decrease at 22 stations where δ 13C depth profiles were compared. The largest and deepest anthropogenic δ 13C decreases occurred in the subpolar ocean and, in contrast, the smallest and shallowest decreases occurred in the tropical ocean. A mean anthropogenic CO2 accumulation rate of 0.63 ± 0.16 mol C m−2 yr−1 (0.32 ± 0.08 Pg C yr−1) in the North Atlantic Ocean over the last 20 years was determined from the mean depth-integrated δ 13C change and a ratio of anthropogenic δ 13C to DIC change of −0.024‰ (μmol kg−1)−1. Only half of the accumulated anthropogenic CO2 in the North Atlantic during the last 20 years was the result of air-sea CO2 uptake, based on a comparison of the air-sea 13CO2 flux to the DIC13 inventory change, with the other half likely a result of northward advective transport.
Description15 páginas, 11 figuras, 1 tabla
Publisher version (URL)http://dx.doi.org/10.1029/2006GB002761
Appears in Collections:(IIM) Artículos
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