Gangsto R. auteur aut IRD Gehlen M. auteur aut IRD Schneider B. auteur aut IRD Bopp L. auteur aut IRD Aumont Olivier auteur aut IRD Joos F. auteur aut IRD text journalArticle eng text/pdf reformatted digital access 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 almost one third 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. specialized PACIFIQUE ATLANTIQUE 032 5 2 1655-1687 2008 https://www.documentation.ird.fr/hor/fdi:010073884 [F B010073884] https://www.documentation.ird.fr/hor/fdi:010073884 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers18-10/010073884.pdf IRD - Base Horizon / Pleins textes 2009-03-20 2018-11-09 fdi:010073884 fre