title: One million years of glaciation and denudation history in west Greenland.
abstract: The influence of major Quaternary climatic changes on growth and decay of the Greenland Ice Sheet, and associated erosional impact on the landscapes, is virtually unknown beyond the last deglaciation. Here we quantify exposure and denudation histories in west Greenland by applying a novel Markov-Chain Monte Carlo modelling approach to all available paired cosmogenic10Be-26Al bedrock data from Greenland. We find that long-term denudation rates in west Greenland range from >50 m Myr-1in low-lying areas to ∼2 m Myr-1at high elevations, hereby quantifying systematic variations in denudation rate among different glacial landforms caused by variations in ice thickness across the landscape. We furthermore show that the present day ice-free areas only were ice covered ca. 45% of the past 1 million years, and even less at high-elevation sites, implying that the Greenland Ice Sheet for much of the time was of similar size or even smaller than today.
authors.affiliation: Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus 8000, Denmark.
authors.forename: Astrid
authors.identifier: 0000-0002-3785-2405
authors.initials: A
authors.lastname: Strunk
authors.affiliation: Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus 8000, Denmark.
authors.forename: Mads Faurschou
authors.initials: MF
authors.lastname: Knudsen
authors.affiliation: Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus 8000, Denmark.
authors.forename: David L
authors.initials: DL
authors.lastname: Egholm
authors.affiliation: Institute of Earth and Environmental Science, University of Potsdam, Karl-Liebknecht-Str 24, Potsdam 14476, Germany.
authors.forename: John D
authors.initials: JD
authors.lastname: Jansen
authors.affiliation: Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus 8000, Denmark.
authors.forename: Laura B
authors.initials: LB
authors.lastname: Levy
authors.affiliation: Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus 8000, Denmark.
authors.forename: Bo H
authors.initials: BH
authors.lastname: Jacobsen
authors.affiliation: Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus 8000, Denmark.|Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, Copenhagen K 1350, Denmark.
authors.forename: Nicolaj K
authors.initials: NK
authors.lastname: Larsen