Climate Dynamics

, Volume 36, Issue 11, pp 2201–2218

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


DOI: 10.1007/s00382-010-0795-1

Cite this article as:
Delaygue, G. & Bard, E. Clim Dyn (2011) 36: 2201. doi:10.1007/s00382-010-0795-1


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.


Beryllium-10Solar activityIce coresAntarcticaPaleoclimate

Supplementary material

382_2010_795_MOESM1_ESM.csv (5 kb)
Supplementary material (CSV 6 kb)

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Université Aix-Marseille III/CNRS/IRD/Collège de France, CEREGEAix-en-Provence Cedex4France
  2. 2.Université Joseph Fourier-Grenoble I/CNRS, LGGESaint-Martin-d’Hères CedexFrance