HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

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

G. Delaygue 1 E. Bard 2
1 CLIPS
LGGE - Laboratoire de glaciologie et géophysique de l'environnement, CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
2 Chaire Evolution du climat et de l'océan
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.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-00646759
Contributor : Aurore Gayraud Connect in order to contact the contributor
Submitted on : Wednesday, November 30, 2011 - 4:51:36 PM
Last modification on : Tuesday, February 8, 2022 - 8:26:59 AM

Links full text

Identifiers

Citation

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⟩

Share

Metrics

Record views

198