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- Title
Millennial scale variability of denudation rates for the last 15 kyr inferred from the detrital <sup>10</sup>Be record of Lake Stappitz in the Hohe Tauern massif, Austrian Alps.
- Authors
Grischott, Reto; Kober, Florian; Lupker, Maarten; Reitner, Juergen M.; Drescher-Schneider, Ruth; Hajdas, Irka; Christl, M.; Willett, Sean D.
- Abstract
Reconstructing paleo-denudation rates over Holocene timescales in an Alpine catchment provides a unique opportunity to isolate the climatic forcing of denudation from other tectonic or anthropogenic effects. Cosmogenic 10Be on two sediment cores from Lake Stappitz (Austrian Alps) were measured yielding a 15-kyr-long catchment-averaged denudation record of the upstream Seebach Valley. The persistence of a lake at the outlet of the valley fixed the baselevel, and the high mean elevation minimizes anthropogenic impacts. The 10Be record indicates a decrease in the proportion of paraglacial sediments from 15 to 7 kyr cal. BP after which the 10Be concentrations are considered to reflect hillslope erosion and thus can be converted to denudation rates. These ones significantly fluctuated over this time period: lower hillslope erosion rates of ca. 0.4 mm/year dated between 5 and 7 kyr cal. BP correlate with a stable climate, sparse flooding events and elevated temperatures that favoured the widespread growth of stabilizing soils and vegetation. Higher hillslope erosion rates of ca. 0.8 mm/year over the last ~4 kyr correlate with a variable, cooler climate where frequent flooding events enhance denudation of less protected hillslopes. Overall, our results suggest a tight coupling of climate and hillslope erosion in alpine landscapes as it has been observed in other parts of the Alps.
- Subjects
AUSTRIAN Alps (Austria); CHEMICAL denudation; COSMOGENIC nuclides; GLACIERS; LAKE sediments
- Publication
Holocene, 2017, Vol 27, Issue 12, p1914
- ISSN
0959-6836
- Publication type
Article
- DOI
10.1177/0959683617708451