Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Modeled natural and excess radiocarbon: Sensitivities to the gas exchange formulation and ocean transport strength
Ist Teil von
Global biogeochemical cycles, 2008-09, Vol.22 (3), p.GB3011-n/a
Ort / Verlag
Washington, DC: American Geophysical Union
Erscheinungsjahr
2008
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Observation‐based surface ocean Δ14C distributions and regional inventories for excess, bomb‐produced radiocarbon are compared with results of two ocean models of intermediate complexity. By applying current descriptions of the air‐sea gas exchange the models produce similar column inventories for excess 14C among all basins. This result is robust across a wide range of transport parameter settings, but inconsistent with data‐based inventories. In the absence of evidence of fundamentally different gas exchange mechanisms in the North Atlantic than in the other basins, we infer regional North Atlantic 14C inventories which are considerably smaller than previous estimates. The results further suggest that the gas exchange velocity field should be reduced by (19 ± 16)%, which corresponds to a global mean air‐sea gas transfer rate for CO2 in seawater of 17.1 ± 3.3 cm h−1, to find good agreement of simulated quantities with a range of data‐based metrics.