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Spatial and tempora...
Spatial and temporal variations of base cation release from chemical weathering on a hillslope scale
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- Erlandsson, M. (författare)
- Uppsala universitet,Uppsala University,Luft-, vatten- och landskapslära
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- Oelkers, E. H. (författare)
- University College London,UCL, Earth Sci, Gower St, London WC1E 6BT, England.
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- Bishop, Kevin (författare)
- Uppsala universitet,Uppsala University,Luft-, vatten- och landskapslära
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- Sverdrup, H. (författare)
- University of Iceland,Univ Iceland, Sch Engn & Nat Sci, Dunhagi 5, IS-107 Reykjavik, Iceland.
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- Belyazid, S. (författare)
- Lund University,Lunds universitet,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Centre for Environmental and Climate Science (CEC),Faculty of Science,Lund Univ, Ctr Environm & Climate Res, Solvegatan 37, S-22362 Lund, Sweden.
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- Ledesma, Jose (författare)
- Sveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för vatten och miljö,Department of Aquatic Sciences and Assessment,Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Box 7050, S-75007 Uppsala, Sweden.
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- Köhler, Stephan (författare)
- Sveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för vatten och miljö,Department of Aquatic Sciences and Assessment,Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Box 7050, S-75007 Uppsala, Sweden.
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(creator_code:org_t)
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- Elsevier BV, 2016
- 2016
- Engelska 13 s.
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Ingår i: Chemical Geology. - : Elsevier BV. - 0009-2541 .- 1872-6836. ; 441, s. 1-13
- Relaterad länk:
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http://dx.doi.org/10...
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https://discovery.uc...
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https://lup.lub.lu.s...
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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
- Cation release rates to catchment runoff from chemical weathering were assessed using an integrated catchment model that included the soil's unsaturated, saturated and riparian zones. In-situ mineral dissolution rates were calculated in these zones as a function of pH, aluminum and dissolved organic carbon (DOC) concentrations along a hillslope in Northern Sweden where soil water was monitored over nine years. Three independent sets of mineral dissolution equations of varying complexity were used: PROFILE, Transition-State Theory (TST), and the Palandri & Kharaka database. Normalization of the rate-coefficients was necessary to compare the equations, as published rate-coefficients gave base cation release rates differing by several orders of magnitude. After normalizing the TST- and Palandri & Kharaka-rate coefficients to match the base cation release rates calculated from the PROFILE-equations, calculated Ca2 + and Mg2 + release rates are consistent with mass balance calculations, whereas those of Na+ and K+ are overestimated. Our calculations further indicate that a significant proportion of base cations are released from the organic soils in the near-stream zone, in part due to its finer texture. Of the three sets of rate equations, the base cation release rates calculated from the normalized TST-equations were more variable than those calculated using the other two sets of equations, both spatially and temporally, due to its higher sensitivity to pH. In contrast, the normalized Palandri & Kharaka-equations were more sensitive to variations in soil temperature.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental 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
- Acidification
- Mineral dissolution kinetics
- PHREEQC
- PROFILE
- Riparian zone
- Transition-State-Theory
- Mineral dissolution kinetics
Publikations- och innehållstyp
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- ref (ämneskategori)
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