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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2019-38
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-38
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Reviews and syntheses 18 Feb 2019

Reviews and syntheses | 18 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Biogeosciences (BG).

Reviews and syntheses: Weathering of silicate minerals in soils and watersheds: Parameterization of the weathering kinetics module in the PROFILE and ForSAFE models

Harald Ulrik Sverdrup1, Eric Oelkers5, Martin Erlandsson Lampa2, Salim Belyazid3, Daniel Kurz4, and Cecilia Akselsson6 Harald Ulrik Sverdrup et al.
  • 1Industrial Engineering, University of Iceland, Reykjavik, Iceland
  • 2Institute of Hydrology, University of Uppsala, Uppsala, Sweden
  • 3Physical Geography, Stockholm University, Stockholm, Sweden
  • 4EKG Geoscience, Bern, Switzerland
  • 5Earth Sciences, University College London, Gower Street, WC1E 6BT, London, UK
  • 6Earth Sciences, University of Lund, Lund, Sweden

Abstract. The PROFILE model, now incorporated in the ForSAFE model can accurately reproduce the chemical and mineralogical evolution of the soil unsaturated zone. However, in deeper soil layers and in groundwater systems, it appears to overestimate weathering rates. This overestimation has been corrected by improving the kinetic expression describing mineral dissolution by adding or upgrading breaking functions. The base cation and aluminium brakes have been strengthened, and an additional silicate brake has been developed, improving the ability to describe mineral-water reactions in deeper soils. These brakes are developed from a molecular-level model of the dissolution mechanisms. Equations, parameters and constants describing mineral dissolution kinetics have now been obtained for 102 different minerals from 12 major structural groups, comprising all types of minerals encountered in most soils. The PROFILE and ForSAFE weathering sub-model was extended to cover two-dimensional catchments, both in the vertical and the horizontal direction, including the hydrology. Comparisons between this improved model and field observations is available in Erlandsson Lampa et al. (2019, This special issue). The results showed that the incorporation of a braking effect of silica concentrations was necessary and helps obtain more accurate descriptions of soil evolution rates at greater depths and within the saturated zone.

Harald Ulrik Sverdrup et al.
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Harald Ulrik Sverdrup et al.
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Short summary
The present publication documents the kinetic parameterisation of the related PROFILE (steady state) and ForSAFE (integrated dynamics) models. It gives the full coefficient database for about 100 minerals occurring in most soils. The text outlines the principles and methods used in setting the coefficient values. It outlines how the models with the parameterisation based on laboratory kinetics, is successful in estimating field weathering rates similar to what is being observed.
The present publication documents the kinetic parameterisation of the related PROFILE (steady...
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