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The Rock Geochemical Model (Rokgem) V0.9 : Volume 5, Issue 3 (30/07/2012)

By Colbourn, G.

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Book Id: WPLBN0004009364
Format Type: PDF Article :
File Size: Pages 76
Reproduction Date: 2015

Title: The Rock Geochemical Model (Rokgem) V0.9 : Volume 5, Issue 3 (30/07/2012)  
Author: Colbourn, G.
Volume: Vol. 5, Issue 3
Language: English
Subject: Science, Geoscientific, Model
Collection: Periodicals: Journal and Magazine Collection
Subcollection: Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description
Description: School of Geographical Sciences, University of Bristol, Bristol, UK. A new model of terrestrial rock weathering – The Rock Geochemical Model (RokGeM) – is 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 runoff 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 runoff 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. 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.; 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.; 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 Model., 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. Geophys. Geosyst., 6, Q05003, 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, Ann. Rev. Earth Planet. Sci., 37, 117–134, doi:10.1146/annurev.earth.031208.100206, 2009.; 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.: Atmospheric carbon dioxide levels over Phanerozoic time, Science, 249, 1382–1386, doi:10.1126/science.249.4975.1382, 1990.; 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.: GEOCARB II; a revised model of atmospheric CO2 over Phanerozoic time, Am. J. Sci., 294, 56–91, available at: http://www.ajsonline.org/cgi/content/abstract/294/1/56, 1994.; Berner, R. A. and Caldeira, K.: The need for mass balance and feedback in the geochemical carbon cycle, Geology, 25, 955–956, doi:2.3.CO;2>10.1130/0091-7613(1997)025<0955:TNFMBA>2.3.CO;2, 1997.; 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.30

 

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