Quantifying the impact of former glaciation on catchment‐wide denudation rates derived from cosmogenic 10Be |
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| Authors: | Christoph Glotzbach Markus Röttjer Andrea Hampel Ralf Hetzel Peter W Kubik |
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| Institution: | 1. Institut für Geologie, Leibniz Universit?t Hannover, , Callinstra?e 30, Hannover, 30167 Germany;2. Institut für Geologie und Pal?ontologie, Westf?lische Wilhelms‐Unversit?t Münster, , Corrensstra?e 24, Münster, 48149 Germany;3. Laboratory of Ion Beam Physics, ETH Zurich, , Schafmattstra?e 20, Zurich, 8093 Switzerland |
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| Abstract: | Glacial denudation can significantly perturb terrestrial cosmogenic nuclide depth profiles and, if this is not corrected for, derived apparent denudation rates will overestimate the actual denudation rates. Here we determine how much 10Be‐derived denudation rates – calculated under the assumption of steady state – deviate from actual denudation rates as a function of three parameters: (1) the total amount of glacial denudation, (2) the post‐glacial denudation rate and (3) the time elapsed since deglaciation. We provide correction lines for the full parameter space explored (glacial denudation: 0.01–100 m; post‐glacial denudation rate: 1–1000 mm/ka; deglaciation: 1–100 ka before present), to evaluate and, if necessary, correct denudation rates for the impact of glacial denudation. Applied to 10Be‐derived catchment‐averaged denudation rates for formerly glaciated catchments in the Black Forest, Germany, we find that uncorrected denudation rates overestimate actual rates by up to a factor of three. |
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