Anthropogenic carbon accumulation in the subtropical North Atlantic

Brown, Peter J., Bakker, Dorothee C. E., Schuster, Ute and Watson, Andrew J. (2010) Anthropogenic carbon accumulation in the subtropical North Atlantic. Journal of Geophysical Research C: Oceans, 115 (4).

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Abstract

Recent data suggest the accumulation of anthropogenic carbon dioxide (?Canth) in the subtropical North Atlantic is not occurring at a steady rate throughout the water column. Carbon measurements from three transatlantic cruises along 24.5°N in 1992, 1998, and 2004 were investigated for changes in Canth using both a back-calculation shortcut technique and extended multiple linear regression. For three time periods (1992-1998, 1998-2004, and 1992-2004) we observed spatial and vertical changes in Canth storage, along with a general increase in total concentration. In the surface layers, total dissolved inorganic carbon (TCO 2) and Canth concentrations increased in line with atmospheric CO2 levels: TCO2 +8.8 ± 0.5 µmol kg-1 for 1992-1998 and +8.6 ± 0.5 µmol kg-1 for 1998-2004 and Canth +8.0 ± 0.2 µmol kg-1 for 1992-1998 and +6.8 ± 0.3 mmol kg-1 for 1998-2004. In deeper waters, ?Canth was significantly different than zero for all depths above 5000 dbar between 1992 and 2004, while on a subdecadal timescale, significant variability was observed for ?Canth at a depth range of 800-1000 dbar. Evidence is presented for the arrival at 24.5°N at depth of freshly ventilated Labrador Sea Water from the subpolar North Atlantic between 1992 and 1998, as well as consistent smaller ?Canth signals alongside the Mid-Atlantic Ridge. This is in addition to low-level, stable increases identified in the deep eastern basin between 1992 and 2004, the first time that ?Canth has been detected and confirmed by new measurements of carbon tetrachloride and CFC-11 from 2004. These results highlight the importance of the subtropics as a site for long-term C anth storage away from the surface.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups:	Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017)
Depositing User:	Rosie Cullington
Date Deposited:	28 Jan 2011 14:29
Last Modified:	06 Feb 2025 01:58
URI:	https://ueaeprints.uea.ac.uk/id/eprint/20249
DOI:	10.1029/2008JC005043

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