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Publication Detail
Does runoff or temperature control chemical weathering rates?
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Eiriksdottir ES, Gislason SR, Oelkers EH
  • Publication date:
    01/06/2011
  • Journal:
    Applied Geochemistry
  • Volume:
    26
  • Issue:
    SUPPL.
  • Status:
    Published
  • Print ISSN:
    0883-2927
Abstract
The rate of chemical denudation is controlled by both temperature and runoff. The relative role of these two factors in the rivers of NE Iceland is determined through the rigorous analysis of their water chemistry over a 5-a period. River catchments are taken to be analogous to laboratory flow reactors; like the fluid in flow reactors, the loss of each dissolved element in river water is the sum of that of the original rainwater plus that added from kinetically controlled dissolution and precipitation reactions. Consideration of the laboratory determined dissolution rate behaviour of basalts and measured water chemistry indicates that the maximum effect of changing temperature on chemical denudation in the NE Icelandic rivers was 5-25% of the total change, whereas that of runoff was 75-95%. The bulk of the increased denudation rates with runoff appear to stem from an increase in reactive surface area for chemical weathering of catchment solids. © 2011 Elsevier Ltd.
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