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Evidence for climate modulation of the 10Be solar activity proxy


Pedro, JB and van Ommen, TD and Curran, MAJ and Morgan, VI and Smith, A and McMorrow, AJ, Evidence for climate modulation of the 10Be solar activity proxy, Journal of Geophysical Research, 111, (21) pp. 1-6. ISSN 0148-0227 (2006) [Refereed Article]

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Copyright Statement

Copyright 2006 by the American Geophysical Union

DOI: doi:10.1029/2005JD006764


We used a snow pit record in conjunction with detailed snow accumulation data and oxygen isotope records to examine atmospheric transport and deposition effects on 10Be at Law Dome, Antarctica. Data from an adjacent automatic weather station was used to date the record at snowfall event-scale resolution. In contrast to prior ice core studies in Antarctica, the snow pit record is of a sufficiently short duration (∼1 year) that 10Be fluctuations reflect mainly atmospheric transport processes rather than solar modulation of production. Elevated concentrations of 10Be were found in the late austral summer and early autumn snow, synchronous with the seasonal increase in stratospheric aerosols at Antarctic stations. A significant (P < 0.01) anticorrelation of 10Be with δ18O occurs at the snowfall event scale. Fractionation of water isotopes at Law Dome is controlled by local and regional processes, specifically transport and local temperature. The anticorrelation seen here implies that 10Be concentration was reduced in snow from warmer air masses (characterized by less negative δ18O). There is potential for confounding solar modulation with climatic modulation if at sites such as this one, warmer meteorological influences may be associated with reduced 10Be concentrations. Quantification of the significance of this effect for the longer-term 10Be record will require analysis of longer 10Be records from different sites.

Item Details

Item Type:Refereed Article
Keywords:climate modulation, cimate change, solar activity, beryllium-10, cosmic ray, radionuclide, Law Dome, Antarctica, palaeoclimate reconstructions
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Glaciology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Pedro, JB (Dr Joel Pedro)
UTAS Author:van Ommen, TD (Dr Tas van Ommen)
UTAS Author:Curran, MAJ (Dr Mark Curran)
UTAS Author:Morgan, VI (Mr Vincent Morgan)
UTAS Author:McMorrow, AJ (Ms Alison McMorrow)
ID Code:42052
Year Published:2006
Web of Science® Times Cited:27
Deposited By:IASOS
Deposited On:2006-08-01
Last Modified:2012-10-23
Downloads:1 View Download Statistics

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