Preprints
https://doi.org/10.5194/gchron-2023-27
https://doi.org/10.5194/gchron-2023-27
09 Jan 2024
 | 09 Jan 2024
Status: a revised version of this preprint is currently under review for the journal GChron.

Local Beryllium-10 production rate for the mid-elevation mountainous regions in Central Europe, deduced from a multi-method study of moraines and lake sediments in the Black Forest

Felix Martin Hofmann, Claire Rambeau, Lukas Gegg, Melanie Schulz, Martin Steiner, Alexander Fülling, Laëtitia Léanni, Frank Preusser, and the ASTER Team

Abstract. Beryllium-10 cosmic-ray (CRE) exposure dating has revolutionised our understanding of glacier fluctuations around the globe. A key prerequisite for the successful application of this dating method is a thorough understanding of local production rates of in-situ accumulated 10Be, usually inferred from independently dated regional reference sites. For the mid-elevation (Variscan) mountain ranges of central Europe, no production rate reference site has been available so far. We fill this gap by determining in-situ 10Be concentrations in large boulders on moraines and by applying radiocarbon and luminescence dating to stratigraphically younger lake sediments in the southern Black Forest, SW Germany. The dating methods yielded concordant results and, based on age-depth modelling with 14C ages, we deduced a local 10Be production rate. The resulting Black Forest (BF) production rate is ~11 % lower than both those at the nearest reference site in the Alps and the canonical global 10Be production rate. A stronger weathering and snow cover bias and a higher impact of soil, moss and shrub cover at the stud site likely explain this discrepancy. Due to its internal robustness, we suggest applying the BF production rate in future CRE dating studies in Central Europe and for revising existing age estimates which will have crucial implications for understanding past atmospheric circulation patterns.

Felix Martin Hofmann, Claire Rambeau, Lukas Gegg, Melanie Schulz, Martin Steiner, Alexander Fülling, Laëtitia Léanni, Frank Preusser, and the ASTER Team

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Review of gchron-2023-27', Anonymous Referee #1, 24 Jan 2024
    • AC1: 'Reply on RC1', Felix Martin Hofmann, 23 Feb 2024
  • RC2: 'Comment on gchron-2023-27', Anonymous Referee #2, 04 Feb 2024
    • AC2: 'Reply on RC2', Felix Martin Hofmann, 23 Feb 2024
Felix Martin Hofmann, Claire Rambeau, Lukas Gegg, Melanie Schulz, Martin Steiner, Alexander Fülling, Laëtitia Léanni, Frank Preusser, and the ASTER Team
Felix Martin Hofmann, Claire Rambeau, Lukas Gegg, Melanie Schulz, Martin Steiner, Alexander Fülling, Laëtitia Léanni, Frank Preusser, and the ASTER Team

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Short summary
We present a new 10Be production rate for the mid-elevation mountain ranges of central Europe. Beryllium-10 surface exposure dating of moraines and radiocarbon dating of presumably younger lake sediments allowed for determining the accumulation rate of 10Be in the surfaces of large boulders on moraines. The accumulation of 10Be was slower at most European reference sites. The estimated rate will not only be useful for future age determinations but also for revising existing age estimates.