Rapid decline of the CO2buffering capacity in the North Sea and implications for the North Atlantic Ocean.

Thomas, Helmuth, Prowe, A.E. Friederike , van Heuven, Steven, Bozec, Yann, de Baar, Hein J. W., Schiettecatte, Laure-Sophie, Suykens, Kim, Koné, Mathieu, Borges, Alberto V., Lima, Ivan D. and Doney, Scott C. (2007) Rapid decline of the CO2buffering capacity in the North Sea and implications for the North Atlantic Ocean. Open Access Global Biogeochemical Cycles, 21 (4). GB4001. DOI 10.1029/2006GB002825.

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New observations from the North Sea, a NW European shelf sea, show that between 2001 and 2005 the CO2 partial pressure (pCO2) in surface waters rose by 22 μatm, thus faster than atmospheric pCO2, which in the same period rose approximately 11 μatm. The surprisingly rapid decline in air‐sea partial pressure difference (ΔpCO2) is primarily a response to an elevated water column inventory of dissolved inorganic carbon (DIC), which, in turn, reflects mostly anthropogenic CO2 input rather than natural interannual variability. The resulting decline in the buffering capacity of the inorganic carbonate system (increasing Revelle factor) sets up a theoretically predicted feedback loop whereby the invasion of anthropogenic CO2 reduces the ocean's ability to uptake additional CO2. Model simulations for the North Atlantic Ocean and thermodynamic principles reveal that this feedback should be stronger, at present, in colder midlatitude and subpolar waters because of the lower present‐day buffer capacity and elevated DIC levels driven either by northward advected surface water and/or excess local air‐sea CO2 uptake. This buffer capacity feedback mechanism helps to explain at least part of the observed trend of decreasing air‐sea ΔpCO2 over time as reported in several other recent North Atlantic studies.

Document Type: Article
Keywords: anthropogenic CO2; Revelle factor; North Sea
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2006GB002825
ISSN: 0886-6236
Date Deposited: 14 Dec 2018 09:00
Last Modified: 14 Dec 2018 09:00
URI: http://oceanrep.geomar.de/id/eprint/45011

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