Modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water CaCO<sub>3</sub> dissolution
The marine aragonite cycle has been included in the global biogeochemical model PISCES to study the role of aragonite in shallow water CaCO<sub>3</sub> dissolution. Aragonite production is parameterized as a function of mesozooplankton biomass and aragonite saturation state of ambient wa...
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2008-07-01
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Series: | Biogeosciences |
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doaj-8b74775fb504453399dbbbd0a933052b2020-11-25T01:06:11ZengCopernicus PublicationsBiogeosciences1726-41701726-41892008-07-015410571072Modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water CaCO<sub>3</sub> dissolutionO. AumontF. JoosL. BoppB. SchneiderM. GehlenR. GangstøThe marine aragonite cycle has been included in the global biogeochemical model PISCES to study the role of aragonite in shallow water CaCO<sub>3</sub> 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 CaCO<sub>3</sub> 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 CaCO<sub>3</sub> dissolution and alkalinity. For the SRES A2 CO<sub>2</sub> 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 CaCO<sub>3</sub> production by 19% relative to pre-industrial. Geographically, the effect from increasing atmospheric CO<sub>2</sub>, 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. http://www.biogeosciences.net/5/1057/2008/bg-5-1057-2008.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
O. Aumont F. Joos L. Bopp B. Schneider M. Gehlen R. Gangstø |
spellingShingle |
O. Aumont F. Joos L. Bopp B. Schneider M. Gehlen R. Gangstø Modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water CaCO<sub>3</sub> dissolution Biogeosciences |
author_facet |
O. Aumont F. Joos L. Bopp B. Schneider M. Gehlen R. Gangstø |
author_sort |
O. Aumont |
title |
Modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water CaCO<sub>3</sub> dissolution |
title_short |
Modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water CaCO<sub>3</sub> dissolution |
title_full |
Modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water CaCO<sub>3</sub> dissolution |
title_fullStr |
Modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water CaCO<sub>3</sub> dissolution |
title_full_unstemmed |
Modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water CaCO<sub>3</sub> dissolution |
title_sort |
modeling the marine aragonite cycle: changes under rising carbon dioxide and its role in shallow water caco<sub>3</sub> dissolution |
publisher |
Copernicus Publications |
series |
Biogeosciences |
issn |
1726-4170 1726-4189 |
publishDate |
2008-07-01 |
description |
The marine aragonite cycle has been included in the global biogeochemical model PISCES to study the role of aragonite in shallow water CaCO<sub>3</sub> 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 CaCO<sub>3</sub> 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 CaCO<sub>3</sub> dissolution and alkalinity. For the SRES A2 CO<sub>2</sub> 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 CaCO<sub>3</sub> production by 19% relative to pre-industrial. Geographically, the effect from increasing atmospheric CO<sub>2</sub>, 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. |
url |
http://www.biogeosciences.net/5/1057/2008/bg-5-1057-2008.pdf |
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