Journal ArticleDOI
Temperature dependence of silicate weathering in nature: How strong a negative feedback on long-term accumulation of atmospheric CO2 and global greenhouse warming?
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In this paper, the temperature dependence of natural feldspar weathering in two catchments at different elevations yields an apparent Arrhenius activation energy of 18.4 kcal/mol (77.0 kJ/mol), much higher than most laboratory values.Abstract:
Estimation of the temperature dependence of natural feldspar weathering in two catchments at different elevations yields an apparent Arrhenius activation energy of 18.4 kcal/mol (77.0 kJ/mol), much higher than most laboratory values. This finding supports recent suggestions that hydrolytic weathering of silicate minerals may consume carbonic acid and thereby remove atmospheric carbon dioxide more rapidly with increasing temperature than previously thought. This result provides a stronger negative feedback on long-term greenhouse warming than has been assumed in most models of global carbon cycling. The present estimate was determined from the ratio of feldspar weathering rates (determined by geochemical mass balance) in the southern Blue Ridge Mountains of North Carolina, United States. Temperature (a function of elevation) is the only factor that differs between the two catchments; parent rock type, aspect, hillslope hydrology, and vegetation type and successional stage are the same in both.read more
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Journal ArticleDOI
Effects of climate on chemical_ weathering in watersheds
Art F. White,Alex E. Blum +1 more
TL;DR: In this paper, the authors evaluated the effect of weathering on chemical weathering by correlating variations on solute concentrations and fluxes with temperature, precipitation, runoff, and evapotranspiration (ET) for a worldwide distribution of sixty-eight watersheds underlain by granitoid rock types.
Journal ArticleDOI
Basalt weathering laws and the impact of basalt weathering on the global carbon cycle
TL;DR: In this paper, the chemical weathering of basalts and the flux of carbon transferred from the atmosphere to the ocean during this major process at the surface of the Earth were investigated.
Journal ArticleDOI
Chemical weathering ,a tmospheric co 2 , and climate
TL;DR: There has been considerable controversy concerning the role of chemical weathering in the regulation of the atmospheric partial pressure of carbon dioxide, and thus the strength of the greenhouse effect and global climate.
Book ChapterDOI
Effects of climate on chemical weathering in watersheds
Art F. White,Alex E. Blum +1 more
TL;DR: In this article, the authors evaluated the effect of climate on chemical weathering by correlating variations in solute con- centrations and fluxes with temperature, precipitation, runoff, and evapotranspiration (ET) for a worldwide distribution of sixty-eight watersheds underlain by granitoid rock types.
Journal ArticleDOI
Terrestrial-marine teleconnections in the Devonian: links between the evolution of land plants, weathering processes, and marine anoxic events
TL;DR: This model provides a framework for understanding links between early land plant evolution and coeval marine anoxic and biotic events, but further testing of Devonian terrestrial-marine teleconnections is needed.
References
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Book ChapterDOI
Hydrogeochemical Constraints on Mass Balances in Forested Watersheds of the Southern Appalachians
TL;DR: In this paper, parent rock type and flushing rate control the long-term average dissolved load of streams in forested watersheds of southwestern North Carolina, U.S.A. The same variables explain qualitative stability relations, as shown by stability field diagrams which are consistent with the hydrology and kaolinite-gibbsite clay mineralogy of the profiles.