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| Titel |
The role of ocean transport in the uptake of anthropogenic CO2 |
| VerfasserIn |
L. Cao, M. Eby, A. Ridgwell, K. Caldeira, D. Archer, A. Ishida, F. Joos, K. Matsumoto, U. Mikolajewicz, A. Mouchet, J. C. Orr, G.-K. Plattner, R. Schlitzer, K. Tokos, I. Totterdell, T. Tschumi, Y. Yamanaka, A. Yool |
| 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 ; 6, no. 3 ; Nr. 6, no. 3 (2009-03-16), S.375-390 |
| Datensatznummer |
250003532
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| Publikation (Nr.) |
 copernicus.org/bg-6-375-2009.pdf |
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| Zusammenfassung |
| We compare modeled oceanic carbon uptake in response to pulse CO2
emissions using a suite of global ocean models and Earth system models. In
response to a CO2 pulse emission of 590 Pg C (corresponding to an
instantaneous doubling of atmospheric CO2 from 278 to 556 ppm), the
fraction of CO2 emitted that is absorbed by the ocean is: 37±8%,
56±10%, and 81±4% (model mean ±2σ ) in year 30,
100, and 1000 after the emission pulse, respectively. Modeled oceanic uptake
of pulse CO2 on timescales from decades to about a century is strongly
correlated with simulated present-day uptake of chlorofluorocarbons (CFCs)
and CO2 across all models, while the amount of pulse CO2 absorbed
by the ocean from a century to a millennium is strongly correlated with
modeled radiocarbon in the deep Southern and Pacific Ocean. However,
restricting the analysis to models that are capable of reproducing
observations within uncertainty, the correlation is generally much weaker.
The rates of surface-to-deep ocean transport are determined for individual
models from the instantaneous doubling CO2 simulations, and they are
used to calculate oceanic CO2 uptake in response to pulse CO2 emissions of
different sizes pulses of 1000 and 5000 Pg C. These results are compared
with simulated oceanic uptake of CO2 by a number of models simulations
with the coupling of climate-ocean carbon cycle and without it. This
comparison demonstrates that the impact of different ocean transport rates
across models on oceanic uptake of anthropogenic CO2 is of similar
magnitude as that of climate-carbon cycle feedbacks in a single model,
emphasizing the important role of ocean transport in the uptake of
anthropogenic CO2. |
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