Atlantic and Arctic sea-air CO2 fluxes, 1990–2009

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Author(s) Schuster, U., et al., Gruber, Nicolas
Publication Type Journal Items, Publication Status: Published
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Title Atlantic and Arctic sea-air CO2 fluxes, 1990–2009
Author(s) Schuster, U.
et al.
Gruber, Nicolas
Journal or Series Title Biogeosciences discussions
Volume Number 9
Issue Number 8
Start Page 10669
End Page 10724
ISSN 1810-6285
Publisher Copernicus
Publication Place Katlenburg-Lindau
Publication Date 2012
Abstract The Atlantic and Arctic oceans are critical components of the global carbon cycle. Here we quantify the net sea-air CO2 flux, for the first time, across different methodologies for consistent time and space scales, for the Atlantic and Arctic basins. We present the long-term mean, seasonal cycle, interannual variability and trends in sea-air CO2 flux for the period 1990 to 2009, and assign an uncertainty to each. We use regional cuts from global observations and modelling products, specifically a pCO2-based CO2 flux climatology, flux estimates from the inversion of oceanic and atmospheric data, and results from six ocean biogeochemical models. Additionally, we use basin-wide flux estimates from surface ocean pCO2 observations based on two distinct methodologies. Our best estimate of the contemporary sea-to-air flux of CO2 (sum of anthropogenic and natural components) by the Atlantic between 40° S and 79° N is −0.49 ± 0.11 Pg C yr−1 and by the Arctic is −0.12 ± 0.06 Pg C yr−1, leading to a combined sea-to-air flux of −0.61 ± 0.12 Pg C yr−1 for the two decades (negative reflects ocean uptake). We do find broad agreement amongst methodologies with respect to the seasonal cycle in the subtropics of both hemispheres, but not elsewhere. Agreement with respect to detailed signals of interannual variability is poor; and correlations to the North Atlantic Oscillation are weaker in the North Atlantic and Arctic than in the equatorial region and South Subtropics. Linear trends for 1995 to 2009 indicate increased uptake and generally correspond between methodologies in the North Atlantic, but there is disagreement amongst methodologies in the equatorial region and South Subtropics.
DOI 10.5194/bgd-9-10669-2012
Additional Notes Received 25 June 2012, Accepted 28 June 2012, Published 9 August 2012
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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Source Database ID FORM-1359382257
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@article{Schstr2012,
  author = "Schuster, U. and et al. and Gruber, Nicolas",
  title = "{A}tlantic and {A}rctic sea-air {C}{O}2 fluxes, 1990{\textendash}2009",
  journal = "Biogeosciences discussions",
  year = 2012,
  volume = "9",
  number = "8",
  pages = "10669--10724",
}


E-Citations record created: Mon, 28 Jan 2013, 14:11:02 CET