Direct effects of CO 2 and temperature on silicate weathering: Possible implications for climate control

Details Direct effects of CO 2 and temperature on silicate weathering: Possible implications for climate control Direct effects of CO 2 and temperature on silicate weathering: Possible implications for climate control

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.1853b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 7, pp.1853-1856

Physics

22

Scientific paper

A critical uncertainty in models of the global carbon cycle and climate is the combined effect of organic activity, temperature, and atmospheric CO 2 on silicate weathering. Here we present new dissolution rates of anorthite and augite which indicate that silicate weathering in organic-rich solutions is not directly affected by soil CO 2 but is very sensitive to temperature. Apparently CO 2 accelerates silicate weathering indirectly by fertilizing organic activity and the production of corrosive organic acids. The weathering dependencies highlight the ability of silicate weathering to act as a global thermostat and damp out climate change, when used as input in steady-state carbon cycle and climate models.

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