GEOCLIM reloaded (v 1.0): a new coupled earth system model for past climate change

S. Arndt (1) , Pierre Régnier (2) , Y. Godderis (1) , Yannick Donnadieu (3)

1 LMTG - Laboratoire des Mécanismes et Transfert en Géologie
2 ULB - Université libre de Bruxelles
3 CLIM - Modélisation du climat

We present a new version of the coupled Earth system model GEOCLIM. The new release, GEOCLIM reloaded (v 1.0), links the existing atmosphere and weathering modules to a novel, temporally and spatially resolved model of the global ocean circulation, which provides a physical framework for a mechanistic description of the marine biogeochemical dynamics of carbon, nitrogen, phosphorus and oxygen. The ocean model is also coupled to a fully formulated, vertically resolved diagenetic model. GEOCLIM reloaded is thus a unique tool to investigate the short- and long-term feedbacks between climatic conditions, continental inputs, ocean biogeochemical dynamics and diagenesis. A complete and detailed description of the resulting Earth system model and its new features is first provided. The performance of GEOCLIM reloaded is then evaluated by comparing steady-state simulation under present-day conditions with a comprehensive set of oceanic data and existing global estimates of bio-element cycling in the pelagic and benthic compartments.

Domaines: Climatologie

S. Arndt, Pierre Régnier, Y. Godderis, Yannick Donnadieu. GEOCLIM reloaded (v 1.0): a new coupled earth system model for past climate change. Geoscientific Model Development, 2011, 4 (2), pp.451-481. ⟨10.5194/gmd-4-451-2011⟩. ⟨hal-02902765⟩