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Primary weathering ...
Primary weathering rates, water transit times, and concentration-discharge relations : A theoretical analysis for the critical zone
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- Ameli, Ali A. (författare)
- Uppsala universitet,Luft-, vatten- och landskapslära,Univ Saskatchewan, Global Inst Water Secur, Saskatoon, SK, Canada.;Western Univ, Dept Biol, London, ON, Canada
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- Beven, Keith (författare)
- Uppsala universitet,Luft-, vatten- och landskapslära,Univ Lancaster, Lancaster Environm Ctr, Lancaster, England.
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- Erlandsson, Martin (författare)
- Stockholms universitet,Institutionen för naturgeografi,Stockholm University,Stockholm Univ, Dept Phys Geog, Stockholm, Sweden.
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- Creed, Irena F. (författare)
- Western Univ, Dept Biol, London, ON, Canada.
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- McDonnell, Jeffrey J. (författare)
- Univ Saskatchewan, Global Inst Water Secur, Saskatoon, SK, Canada.;Univ Aberdeen, Sch Geosci, Aberdeen, Scotland.;Oregon State Univ, Dept Forest Engn Resources & Management, Corvallis, OR 97331 USA.
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- Bishop, Kevin (författare)
- Uppsala universitet,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för vatten och miljö,Department of Aquatic Sciences and Assessment,Uppsala University,Luft-, vatten- och landskapslära,Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
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(creator_code:org_t)
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- AMER GEOPHYSICAL UNION, 2017
- 2017
- Engelska.
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Ingår i: Water resources research. - : AMER GEOPHYSICAL UNION. - 0043-1397 .- 1944-7973. ; 53:1, s. 942-960
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://res.slu.se/i...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- The permeability architecture of the critical zone exerts a major influence on the hydrogeochemistry of the critical zone. Water flow path dynamics drive the spatiotemporal pattern of geochemical evolution and resulting streamflow concentration-discharge (C-Q) relation, but these flow paths are complex and difficult to map quantitatively. Here we couple a new integrated flow and particle tracking transport model with a general reversible Transition State Theory style dissolution rate law to explore theoretically how C-Q relations and concentration in the critical zone respond to decline in saturated hydraulic conductivity (K-s) with soil depth. We do this for a range of flow rates and mineral reaction kinetics. Our results show that for minerals with a high ratio of equilibrium concentration ( Ceq) to intrinsic weathering rate ( Rmax), vertical heterogeneity in K-s enhances the gradient of weathering-derived solute concentration in the critical zone and strengthens the inverse stream C-Q relation. As CeqRmax decreases, the spatial distribution of concentration in the critical zone becomes more uniform for a wide range of flow rates, and stream C-Q relation approaches chemostatic behavior, regardless of the degree of vertical heterogeneity in K-s. These findings suggest that the transport-controlled mechanisms in the hillslope can lead to chemostatic C-Q relations in the stream while the hillslope surface reaction-controlled mechanisms are associated with an inverse stream C-Q relation. In addition, as CeqRmax decreases, the concentration in the critical zone and stream become less dependent on groundwater age (or transit time).
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Nyckelord
- chemical weathering
- conductivity profile
- stream C-Q relation
- saturated-unsaturated flow and transport
- transit time
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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