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| Titel |
An assessment of the Atlantic and Arctic sea–air CO2 fluxes, 1990–2009 |
| VerfasserIn |
U. Schuster, G. A. McKinley, N. Bates, F. Chevallier, S. C. Doney, A. R. Fay, M. González-Dávila, N. Gruber, S. Jones, J. Krijnen, P. Landschützer, N. Lefèvre, M. Manizza, J. Mathis, N. Metzl, A. Olsen, A. F. Ríos, C. Rödenbeck, J. M. Santana-Casiano, T. Takahashi, R. Wanninkhof, A. J. Watson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 1 ; Nr. 10, no. 1 (2013-01-29), S.607-627 |
| Datensatznummer |
250017492
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| Publikation (Nr.) |
 copernicus.org/bg-10-607-2013.pdf |
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| Zusammenfassung |
| 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 modeling 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 estimate of the
contemporary sea–air flux of CO2 (sum of anthropogenic and natural
components) by the Atlantic between 40° S and 79° N is
−0.49 ± 0.05 Pg C yr−1,
and by the Arctic it is −0.12 ± 0.06 Pg C yr−1, leading to a combined sea–air flux of −0.61 ± 0.06 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 southern
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 southern
subtropics. |
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