Modeling and Simulation; Earth and Planetary Sciences (all); coral reefs
Abstract :
[en] Coral reef development is intricately linked to both climate and the concentration of atmospheric CO2, specifically through temperature and carbonate chemistry in the upper ocean. In turn, the calcification of corals modifies the concentration of dissolved inorganic carbon (DIC) and total alkalinity in the ocean, impacting air–sea gas exchange, atmospheric CO2 concentration, and ultimately the climate. This feedback between atmospheric conditions and coral biogeochemistry can only be accounted for with a coupled coral–carbon–climate model. Here we present the implementation of a coral reef calcification module into an Earth system model. Simulated coral reef production of the calcium carbonate mineral aragonite depends on photosynthetically active radiation, nutrient concentrations, salinity, temperature, and the aragonite saturation state. An ensemble of 210 parameter perturbation simulations was performed to identify carbonate production parameter values that optimize the simulated distribution of coral reefs and associated carbonate production. The tuned model simulates the presence of coral reefs and regional-to-global carbonate production values in good agreement with data-based estimates, despite some limitations due to the imperfect simulation of climatic and bio-geochemical fields driving the simulation of coral reef development. When used in association with methods accounting for bathymetry changes resulting from different sea levels, the model enables assessment of past and future coral–climate coupling on seasonal to millennial timescales, highlighting how climatic trends and variability may affect reef development and the resulting climate–carbon feedback.
Research Center/Unit :
SPHERES - ULiège
Disciplines :
Earth sciences & physical geography
Author, co-author :
Bouttes, Nathaelle ; Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France
Kwiatkowski, Lester ; LOCEAN Laboratory, Sorbonne Université-CNRS-IRD-MNHN, Paris, France
Berger, Manon; Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France ; LMD-IPSL, CNRS, École Normale Supérieure, PSL Res. Univ, École Polytechnique, Sorbonne Université, Paris, France
Brovkin, Victor ; Max Planck Institute for Meteorology, Hamburg, Germany ; CEN, University of Hamburg, Hamburg, Germany
Munhoven, Guy ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Language :
English
Title :
Implementing the iCORAL (version 1.0) coral reef CaCO3 production module in the iLOVECLIM climate model
The Interglacial CO2 mystery — TICMY SEdiment REsponse to NATural and Anthropogenic carbon cycle perturbations — SERENATA
Funders :
ANR - Agence Nationale de la Recherche F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding number :
ANR-23-CE01-0005-01; CDR J.0123.19
Funding text :
This research has been supported by the Belgian Fund for Scientific Research, F.R.S.-FNRS (project SERENATA, grant no. CDR J.0123.19) and by the French National Research Agency ANR (project TICMY, grant no. ANR-23-CE01-0005-01). Guy Munhoven is a Research Associate with the Belgian Fund for Scientific Research, F.R.S.-FNRS.
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