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Rapid decline of the CO2 buffering capacity in the North Sea and implications for the North Atlantic Ocean
Authors
A. E. Friederike Prowe
Alberto V. Borges
+60 more
Anderson
Anderson
Bates
Borges
Bozec
Bozec
Corbière
de Haas
Delille
Dilling
Doney
Doney
Doney
Doney
Dore
Feely
Frankignoulle
Fung
Gruber
Hein J. W. de Baar
Helmuth Thomas
Inoue
Intergovernmental Panel on Climate Change (IPCC)
Ivan D. Lima
Johnson
Kim Suykens
Körtzinger
Lambert
Laure-Sophie Schiettecatte
Le Quéré
Lefèvre
Lenhart
Mathieu Koné
Mikaloff-Fletcher
Moore
Olsen
Omar
Orr
Polyakov
Revelle
Riebesell
Sabine
Sarmiento
Sarmiento
Schiettecatte
Scott C. Doney
Steven van Heuven
Takahashi
Takahashi
Takahashi
Thomas
Thomas
Thomas
Thomas
Thomas
Tsunogai
Winn
Wollast
Yann Bozec
Yeager
Publication date
1 January 2007
Publisher
'American Geophysical Union (AGU)'
Doi
Cite
Abstract
Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 21 (2007): GB4001, doi:10.1029/2006GB002825.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.S. Doney and I. Lima were supported by NSF/ONR NOPP (N000140210370) and NASA (NNG05GG30G)
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