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| Titel |
Wind-driven changes in the ocean carbon sink |
| VerfasserIn |
N. C. Swart, J. C. Fyfe, O. A. Saenko, M. Eby |
| 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 ; 11, no. 21 ; Nr. 11, no. 21 (2014-11-13), S.6107-6117 |
| Datensatznummer |
250117669
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| Publikation (Nr.) |
 copernicus.org/bg-11-6107-2014.pdf |
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| Zusammenfassung |
| We estimate changes in the historical ocean carbon sink and their uncertainty
using an ocean biogeochemical model driven with wind forcing from six
different reanalyses and using two different eddy parameterization schemes.
First, we quantify wind-induced changes over the extended period from 1871 to
2010 using the 20th Century Reanalysis winds. Consistent with previous
shorter-term studies, we find that the wind changes act to reduce the ocean
carbon sink, but the wind-induced trends are subject to large uncertainties.
One major source of uncertainty is the parameterization of mesoscale eddies
in our coarse resolution simulations. Trends in the Southern Ocean residual
meridional overturning circulation and the globally integrated surface carbon
flux over 1950 to 2010 are about 2.5 times smaller when using a variable eddy
transfer coefficient than when using a constant coefficient in this
parameterization. A second major source of uncertainty arises from
disagreement on historical wind trends. By comparing six reanalyses
over 1980 to 2010, we show that there are statistically significant differences in
estimated historical wind trends, which vary in both sign and magnitude
amongst the products. Through simulations forced with these reanalysis winds,
we show that the influence of historical wind changes on ocean carbon uptake
is highly uncertain, and the resulting trends depend on the choice of surface
wind product. |
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