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<p>This study reconstructs sediment accumulation rates in two lakes of the Vosges Mountains (northeastern France): Gérardmer (urban catchment) and Longemer (forested catchment). Sediment cores collected in 2013 were dated using <sup>210</sup>Pb, <sup>137</sup>Cs, and <sup>241</sup>Am, with the CRS model validated by fallout markers from 1963 to 1986. Results show a rise in mass accumulation rates from 0.02 ± 0.013 g&#xa0;cm<sup>−2</sup>&#xa0;yr<sup>−1</sup> in the late nineteenth century to nearly 0.200 ± 0.028 g&#xa0;cm<sup>−2&#xa0;</sup>yr<sup>−1</sup> by 2020, with synchronous fluctuations linked to regional climate but different amplitudes due to catchment conditions. Gérardmer shows sharper peaks caused by urbanisation, while Longemer records smoother variations under forest cover. These findings underline the combined influence of climate forcing and land use on lake sedimentation and confirm the value of a multi-isotope approach for recent environmental reconstructions.</p>

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Comparative analysis of recent sedimentation histories for Longemer and Gérardmer lakes in Vosges, France: a geochronological study using 210Pb, 137Cs and 241Am

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Dalil Boumala,
  • Ahmed Tedjani,
  • Mounir Souici,
  • Abdelfettah Belafrites,
  • Nabil Ounoughi,
  • Christophe Mavon,
  • J.-E. Groetz

摘要

This study reconstructs sediment accumulation rates in two lakes of the Vosges Mountains (northeastern France): Gérardmer (urban catchment) and Longemer (forested catchment). Sediment cores collected in 2013 were dated using 210Pb, 137Cs, and 241Am, with the CRS model validated by fallout markers from 1963 to 1986. Results show a rise in mass accumulation rates from 0.02 ± 0.013 g cm−2 yr−1 in the late nineteenth century to nearly 0.200 ± 0.028 g cm−2 yr−1 by 2020, with synchronous fluctuations linked to regional climate but different amplitudes due to catchment conditions. Gérardmer shows sharper peaks caused by urbanisation, while Longemer records smoother variations under forest cover. These findings underline the combined influence of climate forcing and land use on lake sedimentation and confirm the value of a multi-isotope approach for recent environmental reconstructions.