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| Titel |
Modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water CaCO3 dissolution |
| VerfasserIn |
R. Gangstø, M. Gehlen, B. Schneider, L. Bopp, O. Aumont, F. Joos |
| 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 ; 5, no. 4 ; Nr. 5, no. 4 (2008-07-28), S.1057-1072 |
| Datensatznummer |
250002678
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| Publikation (Nr.) |
 copernicus.org/bg-5-1057-2008.pdf |
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| Zusammenfassung |
| The marine aragonite cycle has been included in the global biogeochemical
model PISCES to study the role of aragonite in shallow water CaCO3
dissolution. Aragonite production is parameterized as a function of
mesozooplankton biomass and aragonite saturation state of ambient waters.
Observation-based estimates of marine carbonate production and dissolution
are well reproduced by the model and about 60% of the combined CaCO3
water column dissolution from aragonite and calcite is simulated above 2000
m. In contrast, a calcite-only version yields a much smaller fraction. This
suggests that the aragonite cycle should be included in models for a
realistic representation of CaCO3 dissolution and alkalinity. For the
SRES A2 CO2 scenario, production rates of aragonite are projected to
notably decrease after 2050. By the end of this century, global aragonite
production is reduced by 29% and total CaCO3 production by 19%
relative to pre-industrial. Geographically, the effect from increasing
atmospheric CO2, and the subsequent reduction in saturation state, is
largest in the subpolar and polar areas where the modeled aragonite
production is projected to decrease by 65% until 2100. |
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