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<p>Since the first measurements of beryllium 10 (<sup>10</sup>Be) in ice, in the seventies, numerous profiles of this cosmogenic isotope have been obtained both in Antarctica and Greenland. In this article, we focus on Antarctic data, available at nine different sites, covering a significant part of the Holocene, from 237 to 7101 yr BP. We show that correlating their <sup>10</sup>Be profiles allows to synchronize these ice cores with an excellent accuracy and to document the spatial variability of <sup>10</sup>Be concentration and flux. We then examine how this variability is taken into account by a simulation of <sup>10</sup>Be fallout recently performed with the ECHAM6.3-HAM2.3 model. Except for a systematic underestimation of <sup>10</sup>Be fluxes at high accumulation sites, these simulations are overall very satisfying. Finally the excellent accuracy of synchronisation based on <sup>10</sup>Be profiles allows us to derive an Antarctic stack record over the last seven millennia. The reliability of the new <sup>10</sup>Be stack is demonstrated by its superior correspondence with the accurately dated IntCal20 record based on <sup>14</sup>C in tree rings.</p>

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Beryllium 10 in Antarctica over the last seven millennia

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月10日

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  • Jean Jouzel,
  • Alexandre Cauquoin,
  • Edouard Bard,
  • Li Zhang,
  • Shugui Hou,
  • Zhenkun Wu,
  • Weijian Zhou,
  • Volodya Lipenkov,
  • Jean-Robert Petit,
  • Grant Raisbeck,
  • Françoise Yiou

摘要

Since the first measurements of beryllium 10 (10Be) in ice, in the seventies, numerous profiles of this cosmogenic isotope have been obtained both in Antarctica and Greenland. In this article, we focus on Antarctic data, available at nine different sites, covering a significant part of the Holocene, from 237 to 7101 yr BP. We show that correlating their 10Be profiles allows to synchronize these ice cores with an excellent accuracy and to document the spatial variability of 10Be concentration and flux. We then examine how this variability is taken into account by a simulation of 10Be fallout recently performed with the ECHAM6.3-HAM2.3 model. Except for a systematic underestimation of 10Be fluxes at high accumulation sites, these simulations are overall very satisfying. Finally the excellent accuracy of synchronisation based on 10Be profiles allows us to derive an Antarctic stack record over the last seven millennia. The reliability of the new 10Be stack is demonstrated by its superior correspondence with the accurately dated IntCal20 record based on 14C in tree rings.