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The Rock Geochemical Model (Rokgem) V0.9 : Volume 6, Issue 5 (13/09/2013)

By Colbourn, G.

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Book Id: WPLBN0003975948
Format Type: PDF Article :
File Size: Pages 31
Reproduction Date: 2015

Title: The Rock Geochemical Model (Rokgem) V0.9 : Volume 6, Issue 5 (13/09/2013)  
Author: Colbourn, G.
Volume: Vol. 6, Issue 5
Language: English
Subject: Science, Geoscientific, Model
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: copernicus

Description
Description: School of Geographical Sciences, University of Bristol, Bristol, UK. 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.

Summary
The Rock Geochemical Model (RokGeM) v0.9

Excerpt
Amiotte-Suchet, P., Probst J. L.,, and Ludwig, W.: Worldwide distribution of continental rock lithology: Implications for the atmospheric/soil CO2 uptake by continental weathering and alkalinity river transport to the oceans, Global Biogeochem. Cy., 17, 1038–1051, doi:10.1029/2002GB001891, 2003.; Amiotte Suchet, P. and Probst, J. L.: A global model for present-day atmospheric/soil CO2 consumption by chemical erosion of continental rocks (GEM-CO2), Tellus B, 47, 273–280, doi:10.1034/j.1600-0889.47.issue1.23.x, 1995.; Annan, J. D. and Hargreaves, J. C.: Efficient identification of ocean thermodynamics in a physical/biogeochemical ocean model with an iterative Importance Sampling method, Ocean Modell., 33, 205–215, 2010.; Archer, D.: Modeling the calcite Lysocline, J. Geophys. Res., 96, 17037–17050, doi:10.1029/91JC01812, 1991.; Archer, D.: Fate of fossil fuel CO2 in geologic time, J. Geophys. Res. (Oceans), 110, 9–14, doi:10.1029/2004JC002625, 2005.; Archer, D. and Ganopolski, A.: A movable trigger: Fossil fuel CO2 and the onset of the next glaciation, Geochem. Geophy. Geosy., 6, 5003, doi:10.1029/2004GC000891, 2005.; Archer, D., Kheshgi, H., and Maier-Reimer, E.: Multiple timescales for neutralization of fossil fuel CO2, Geophys. Res. Lett., 24, 405–408, doi:10.1029/97GL00168, 1997.; Archer, D., Eby, M., Brovkin, V., Ridgwell, A., Cao, L., Mikolajewicz, U., Caldeira, K., Matsumoto, K., Munhoven, G., Montenegro, A., and Tokos, K.: Atmospheric Lifetime of Fossil Fuel Carbon Dioxide, Annu. Rev. Earth Planet. Sci., 37, 117–134, doi:10.1146/annurev.earth.031208.100206, 2009.; Beaulieu, E., Goddéris, Y., Labat, D., Roelandt, C., Oliva, P., and Guerrero, B.: Impact of atmospheric CO2 levels on continental silicate weathering, Geochem. Geophy. Geosy., 11, Q07007, doi:10.1029/2010GC003078, 2010.; Beaulieu, E., Goddéris, Y., Donnadieu, Y., Labat, D., and Roelandt, C.: High sensitivity of the continental-weathering carbon dioxide sink to future climate change, Nature Climate Change, 2, 346–349, doi:10.1038/nclimate1419, 2012.; Bergman, N. M., Lenton, T. M., and Watson, A. J.: COPSE: A new model of biogeochemical cycling over phanerozoic time, Am. J. Sci., 304, 397–437, 2004.; Berner, R. A.: A model for atmospheric CO2 over phanerozoic time, Am. J. Sci., 291, 339–376, doi:10.1126/science.249.4975.1382, 1991.; Berner, R. A., Lasaga, A. C., and Garrels, R. M.: The Carbonate-Silicate Geochemical Cycle and its Effect on Atmospheric Carbon Dioxide over the past 100 Million Years, Am. J. Sci., 283, 641–683, 1983.; Berner, R. A.: Atmospheric carbon dioxide levels over Phanerozoic time, Science, 249, 1382–1386, doi:10.1126/science.249.4975.1382, 1990.; Berner, R. A.: GEOCARB II; a revised model of atmospheric CO2 over Phanerozoic time, Am. J. Sci., 294, 56–91, 1994.; Berner, R. A. and Kothavala, Z.: Geocarb III: A Revised Model of Atmospheric CO2 over Phanerozoic Time, Am. J. Sci., 301, 182–204, doi:10.2475/ajs.301.2.182, 2001.; Bluth, G.

 

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