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| Titel |
Simulated anthropogenic CO2 storage and acidification of the Mediterranean Sea |
| VerfasserIn |
J. Palmieri, J. C. Orr, J.-C. Dutay, K. Béranger, A. Schneider, J. Beuvier, S. Somot |
| 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 ; 12, no. 3 ; Nr. 12, no. 3 (2015-02-10), S.781-802 |
| Datensatznummer |
250117804
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| Publikation (Nr.) |
 copernicus.org/bg-12-781-2015.pdf |
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| Zusammenfassung |
| Constraints on the Mediterranean Sea's storage of anthropogenic
CO2 are limited, coming only from data-based approaches that
disagree by more than a factor of two. Here we simulate this
marginal sea's anthropogenic carbon storage by applying
a perturbation approach in a high-resolution regional model. Our
model simulates that, between 1800 and 2001, basin-wide CO2
storage by the Mediterranean Sea has increased by 1.0 Pg C,
a lower limit based on the model's weak deep-water ventilation, as
revealed by evaluation with CFC-12. Furthermore, by testing a
data-based approach (transit time distribution) in our model,
comparing simulated anthropogenic CO2 to values computed from
simulated CFC-12 and physical variables, we conclude that the
associated basin-wide storage of 1.7 Pg, published previously, must
be an upper bound. Out of the total simulated storage of
1.0 Pg C, 75% comes from the air–sea flux into the
Mediterranean Sea and 25% comes from net transport from the
Atlantic across the Strait of Gibraltar. Sensitivity tests indicate
that the Mediterranean Sea's higher total alkalinity, relative to
the global-ocean mean, enhances the Mediterranean's total inventory
of anthropogenic carbon by 10%. Yet the corresponding average
anthropogenic change in surface pH does not differ significantly
from the global-ocean average, despite higher total alkalinity. In
Mediterranean deep waters, the pH change is estimated to be between
−0.005 and −0.06 pH units. |
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