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- W2550653710 abstract "Abstract We report concentrations of cosmogenic 10 Be and 36 Cl used to determine erosion depths in the recently deglaciated bedrock at Goldbergkees in the Eastern Alps. The glacier covered the sampling sites during the Little Ice Age (LIA) until c . 1940. The youngest ages calculated from these concentrations match the known exposure time after the post‐LIA exposure of <100 years. The apparent age (no cover, no erosion) of most samples, however, is significantly older. We show that the measured nuclide concentrations represent subglacial erosion depths, rather than exposure times. In particular, erosion depths calculated using 10 Be and 36 Cl concentrations of individual samples match well, whereas apparent 36 Cl ages are consistently older than 10 Be ages. The bedrock at the ‘youngest’ surfaces was deeply eroded (≥ 297 cm) by the Goldbergkees during the late Holocene. In contrast, bedrock at the margin of the LIA ice extent was eroded ≤35 cm. These values convert to subglacial erosion rates on the order of 0.1 mm/a to >5 mm/a. While modeled erosion rates depend on the duration of glacial cover and erosion intrinsic to the different exposure scenarios used for calculation (700–3300 years), modeled total erosion depths are insensitive (5–20% change). Analysis of erosion depths on the transverse valley profile shows a general trend of greatest erosion part way up the valley side and less erosion under thin ice at the lateral margin. A second profile along the valley axis indicates depth of erosion is greatest where the ice abuts the foot of the investigated bedrock riegel and at its lee side just beyond the crest. Copyright © 2016 John Wiley & Sons, Ltd." @default.
- W2550653710 created "2016-11-30" @default.
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- W2550653710 date "2017-01-13" @default.
- W2550653710 modified "2023-10-16" @default.
- W2550653710 title "Subglacial abrasion rates at Goldbergkees, Hohe Tauern, Austria, determined from cosmogenic<sup>10</sup>Be and<sup>36</sup>Cl concentrations" @default.
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- W2550653710 doi "https://doi.org/10.1002/esp.4093" @default.
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