A 600-year annual Be-10 record from the NGRIP ice core, Greenland

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2009 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 36, article id L11801Article in journal (Refereed) Published

Abstract [en]

Despite the extensive use of Be-10 as the most significant information source on past solar activity, there has been only one record (Dye-3, Greenland) providing annual resolution over several centuries. Here we report a new annual resolution Be-10 record spanning the period 1389-1994 AD, measured in an ice core from the NGRIP site in Greenland. NGRIP and Dye-3 Be-10 exhibits similar long-term variability, although occasional short term differences between the two sites indicate that at least two high resolution Be-10 records are needed to assess local variations and to confidently reconstruct past solar activity. A comparison with sunspot and neutron records confirms that ice core Be-10 reflects solar Schwabe cycle variations, and continued Be-10 variability suggests cyclic solar activity throughout the Maunder and Sporer grand solar activity minima. Recent Be-10 values are low; however, they do not indicate unusually high recent solar activity compared to the last 600 years. Citation: Berggren, A.-M., J. Beer, G. Possnert, A. Aldahan, P. Kubik, M. Christl, S. J. Johnsen, J. Abreu, and B. M. Vinther (2009), A 600-year annual Be-10 record from the NGRIP ice core, Greenland, Geophys. Res. Lett., 36, L11801, doi: 10.1029/2009GL038004.

Place, publisher, year, edition, pages

2009. Vol. 36, article id L11801

Keywords [en]

solar-activity maunder minimum antarctica climate model firn Geology

Research subject

SWEDARCTIC 1997, NordGRIP 1997; SWEDARCTIC 1998, NordGRIP 1998; SWEDARCTIC 1999, NordGRIP 1999; SWEDARCTIC 2000, NordGRIP 2000; SWEDARCTIC 2001, NordGRIP 2001; SWEDARCTIC 2002, NordGRIP 2002; SWEDARCTIC 2003, NordGRIP 2003; SWEDARCTIC 2004, NordGRIP 2004

Identifiers

URN: urn:nbn:se:polar:diva-1886DOI: 10.1029/2009gl038004OAI: oai:DiVA.org:polar-1886DiVA, id: diva2:810836

Note

ISI Document Delivery No.: 455ES Times Cited: 46 Cited Reference Count: 26 Berggren, A. -M. Beer, J. Possnert, G. Aldahan, A. Kubik, P. Christl, M. Johnsen, S. J. Abreu, J. Vinther, B. M. Swedish Research Council; Swiss National Science Foundation; Denmark (FNU); Belgium (FNRS-CFB); France (IPEV and INSU/CNRS); Germany (AWI); Iceland (RannIs); Japan (MEXT); Sweden (SPRS); Switzerland (SNF); USA (NSF, Office of Polar Programs) We acknowledge the financial support from the Swedish Research Council and the Swiss National Science Foundation. NGRIP is directed and organized by the Ice and Climate research group, Niels Bohr Institute, University of Copenhagen. It is supported by funding agencies in Denmark (FNU), Belgium (FNRS-CFB), France (IPEV and INSU/CNRS), Germany (AWI), Iceland (RannIs), Japan (MEXT), Sweden (SPRS), Switzerland (SNF) and the USA (NSF, Office of Polar Programs). We thank Irene Brunner for preparing the Zurich samples. Anonymous reviewers provided useful comments on earlier versions of the manuscript. 46 Amer geophysical union Washington Geosciences, Multidisciplinary

Available from: 2015-05-08 Created: 2015-05-06 Last updated: 2017-12-04Bibliographically approved

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