Articles | Volume 6, issue 5
Geosci. Model Dev., 6, 1543–1573, 2013
Geosci. Model Dev., 6, 1543–1573, 2013

Model description paper 13 Sep 2013

Model description paper | 13 Sep 2013

The Rock Geochemical Model (RokGeM) v0.9

G. Colbourn1,2, A. Ridgwell1, and T. M. Lenton2 G. Colbourn et al.
  • 1School of Geographical Sciences, University of Bristol, Bristol, UK
  • 2College of Life and Environmental Sciences, University of Exeter, Exeter, UK

Abstract. A new model of terrestrial rock weathering – the Rock Geochemical Model (RokGeM) – was developed for incorporation into the GENIE Earth System modelling framework. In this paper we describe the model. We consider a range of previously devised parameterizations, ranging from simple dependencies on global mean temperature following Berner et al. (1983), to spatially explicit dependencies on run-off and temperature (GKWM, Bluth and Kump, 1994; GEM-CO2, Amiotte-Suchet et al., 2003) – fields provided by the energy-moisture balance atmosphere model component in GENIE. Using long-term carbon cycle perturbation experiments, we test the effects of a wide range of model parameters, including whether or not the atmosphere was "short-circuited" in the carbon cycle; the sensitivity and feedback strength of temperature and run-off on carbonate and silicate weathering; different river-routing schemes; 0-D (global average) vs. 2-D (spatially explicit) weathering schemes; and the lithology dependence of weathering. Included are details of how to run the model and visualize the results.