『Abstract
　Understanding the controls on chemical weathering, especially of silicate minerals, remains a major challenge, despite its importance in controlling the evolution of the Earth's surface. In particular, it has proved hard to distinguish the temperature sensitivity of silicate weathering rates from other factors. Here we present a new compilation of chemical and physical erosion rates in small catchments and show that silicate weathering rates are not governed by any single parameter but require consideration i multiple dimensions. The overall variation in silicate weathering rates with physical erosion rates, rainfall, and temperature can be quantitatively described by a parameterization based on considering their limiting relationships. At lower erosion rates mineral supply limits weathering. At higher erosion rates there is abundant material but kinetic and therefore climatic factors limit weathering. A predictive model describing the field data based o transport and weathering (kinetically) cations from weathering is directly proportional to the supply of material by erosion, consistent with complete leaching of cations from fresh regolith. In the kinetically limited case, weathering scales directly with runoff, as the square root of erosion rate, and with an activation energy of 74±29 kJ/mol, consistent with expected values in the Earth's surface settings.

Keywords: weathering; erosion; CO2; climate change; feedback; transport-limited』

1. Introduction
2. Methods of data compilation and analysis
　2.1. Data source
　2.2. Setting
　2.3. Calculation of weathering fluxes
　2.4. Calculation of physical erosion fluxes
3. Results
4. Discussion
　4.1. Limits on silicate weathering rates: transport limitation
　4.2. Limits on silicate weathering rates: kinetic limitation
　4.3. Variability of kinetic thresholds and time scale of weathering
5. Conclusions
Acknowledgements
Appendix A. Least-squares fitting
References