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An Antarctic view of Beryllium-10 and solar activity for the past millennium

G. Delaygue 1 E. Bard 2
LGGE - Laboratoire de glaciologie et géophysique de l'environnement, CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
Abstract : Beryllium-10 in ice provides a valuable proxy of solar activity. However, complex production pathways, atmospheric transport, and deposition processes impede its quantitative interpretation. Here, we examine the influence of deposition processes on two Be-10 ice core records from Central Antarctica (South Pole and Dome Fuji stations), covering the last millennium. We try to quantify how Be-10 variations in ice relate to variations in Be-10 production, and the bias associated to this relationship. An independent bias estimation is provided by comparing atmospheric radiocarbon variations reconstructed from tree rings and deduced from Be-10 variations. Both techniques suggest an uncertainty of the order of 10% in Be-10 production. This uncertainty estimate does not account for the geographical origin of Be-10, which remains a major issue. Because both Be-10 records are so similar, we propose to average them as a means to decrease the unshared (non solar) variability. This average record provides a new reconstruction of solar modulation parameter Φ and total solar irradiance over the last ~1,300 years. The lowest solar activity is found during the so-called Spörer Minimum (around AD 1450). The highest activities are found during the 8th century and over the last decades: as shown in previous studies, our results suggest that the recent solar activity is not exceptionally high for the last millennium.
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Submitted on : Wednesday, November 30, 2011 - 4:51:36 PM
Last modification on : Saturday, October 3, 2020 - 3:19:54 AM

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G. Delaygue, E. Bard. An Antarctic view of Beryllium-10 and solar activity for the past millennium. Climate Dynamics, Springer Verlag, 2010, 36 (11-12), pp.2201-2218. ⟨10.1007/s00382-010-0795-1⟩. ⟨insu-00646759⟩



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