Chemical dynamics and weathering rates of a carbonate basin Bow River,southern Alberta |
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| Institution: | 1. Department of Geotechnical Engineering and Geosciences, Universitat Politècnica de Catalunya, c/ Jordi Girona 18, Barcelona 08034, Spain;2. Associated Unit: Hydrogeology Group (UPC-CSIC);1. Czech Geological Survey, Klárov 3, 118 21 Prague 1, Czech Republic;2. Department of Geology, Faculty of Science, Palacký University, 17. listopadu 12, 771 46 Olomouc, Czech Republic;3. Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic;1. Indian Institute of Tropical Meteorology, Prof. Ram Nath Vij Marg, New Delhi 110 060, India;2. Department of Environmental Science and Analytical Chemistry, Stockholm University, 10691, Sweden;3. Aryabhatta Research Institute of Observational Sciences, Nainital 263 001, India;4. Clarkson University, Box 5708, Potsdam, NY 13699-5708, USA;5. Washington University in St. Louis, MO 6313, USA;1. Northern Appalachian Research Laboratory, USGS Leetown Science Center, Wellsboro, PA 16901, USA;2. Department of Medical Biometry, University of Bonn, Sigmund-Freud-Strasse 25, 53105 Bonn, Germany;3. Tunison Laboratory of Aquatic Science, USGS Great Lakes Science Center, Cortland, NY 13045, USA |
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| Abstract: | Discharge is the dominant control on the TDS load of the Bow River; TDS varies inversely with discharge. Although discharge is the dominant control on concentration, the sources of ions in the river are atmospheric deposition and water/rock interaction. Atmospheric loading can be a significant source of some ions in the pristine headwaters of the river (e.g., 50% of K, 17% of SO4, 16% of Cl). In terms of water/rock interaction, the input of ions to the river is largely controlled by dissolution of carbonate and evaporite minerals.The chemical denudation rate for the Bow River at Banff is 678 kg/ha/a, or 1.50×108 kg of rock that is removed as dissolved load each year, in the low range for an alpine carbonate basin. An additional 11 kg/ha/a are removed as suspended load. A rock volume of 5.45×104 m3 is carried by the Bow River from Banff National Park each year. |
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