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| Titel |
Simulation of anthropogenic CO2 uptake in the CCSM3.1 ocean circulation-biogeochemical model: comparison with data-based estimates |
| VerfasserIn |
S. Wang, J. K. Moore, F. W. Primeau, S. Khatiwala |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2012-04-11), S.1321-1336 |
| Datensatznummer |
250006945
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| Publikation (Nr.) |
 copernicus.org/bg-9-1321-2012.pdf |
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| Zusammenfassung |
| The global ocean has taken up a large fraction of the CO2 released by
human activities since the industrial revolution. Quantifying the oceanic
anthropogenic carbon (Cant) inventory and its variability is important
for predicting the future global carbon cycle. The detailed comparison of
data-based and model-based estimates is essential for the validation and
continued improvement of our prediction capabilities. So far, three global
estimates of oceanic Cant inventory that are "data-based" and
independent of global ocean circulation models have been produced: one based
on the Δ C* method, and two that are based on constraining
surface-to-interior transport of tracers, the TTD method and a maximum
entropy inversion method (GF). The GF method, in particular, is capable of
reconstructing the history of Cant inventory through the industrial
era. In the present study we use forward model simulations of the Community
Climate System Model (CCSM3.1) to estimate the Cant inventory and
compare the results with the data-based estimates. We also use the
simulations to test several assumptions of the GF method, including the
assumption of constant climate and circulation, which is common to all the
data-based estimates. Though the integrated estimates of global Cant
inventories are consistent with each other, the regional estimates show
discrepancies up to 50 %. The CCSM3 model underestimates the total
Cant inventory, in part due to weak mixing and ventilation in the North
Atlantic and Southern Ocean. Analyses of different simulation results
suggest that key assumptions about ocean circulation and air-sea
disequilibrium in the GF method are generally valid on the global scale, but
may introduce errors in Cant estimates on regional scales. The GF
method should also be used with caution when predicting future oceanic
anthropogenic carbon uptake. |
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