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New Single-Year Radiocarbon Measurements Based on Danish oak Covering the Periods AD 692–790 and 966–1057

Part of: IntCal 20

Published online by Cambridge University Press:  12 December 2019

Sabrina G K Kudsk ,
Bente Philippsen Open the ORCID record for Bente Philippsen [Opens in a new window] ,
Claudia Baittinger ,
Alexandra Fogtmann-Schulz Open the ORCID record for Alexandra Fogtmann-Schulz [Opens in a new window] ,
Mads F Knudsen ,
Christoffer Karoff  and
Jesper Olsen Open the ORCID record for Jesper Olsen [Opens in a new window]
Sabrina G K Kudsk
Affiliation:
Institute for Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
Bente Philippsen
Affiliation:
Aarhus AMS Centre (AARAMS), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark Centre for Urban Networks Evolutions (UrbNet), Aarhus University, Moesgård Allé 20, DK-8270 Højbjerg, Denmark
Claudia Baittinger
Affiliation:
Environmental Archaeology and Materials Science, National Museum of Denmark, IC Modewegs Vej, Brede, DK-2800 Kgs. Lyngby, Denmark
Alexandra Fogtmann-Schulz
Affiliation:
Institute for Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
Mads F Knudsen
Affiliation:
Institute for Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
Christoffer Karoff
Affiliation:
Institute for Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
Jesper Olsen*
Affiliation:
Aarhus AMS Centre (AARAMS), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark Centre for Urban Networks Evolutions (UrbNet), Aarhus University, Moesgård Allé 20, DK-8270 Højbjerg, Denmark
*
*Corresponding author. Email: jesper.olsen@phys.au.dk.
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Abstract

Single-year measurements of radiocarbon (14C) in tree rings have led to the discovery of rapid cosmic-ray events as well as longer lasting anomalies, which have given new insights into the Sun’s behavior in the past. Here, we present two new single-year 14C records based on Danish oak that span the periods AD 692–790 and 966–1057, respectively, and consequently include the two rapid cosmic-ray events in AD 775 and 994. The new data are presented along with relevant information on the dendrochronological dating of the wood pieces, implying that these new measurements may contribute towards generating the next international calibration curve. The new data covering the AD 966–1057 period suggest that the increase in atmospheric 14C associated with the cosmic-ray event in AD 994 actually occurred in AD 993, i.e. one year earlier than the year reported in Fogtmann-Schulz et al. (2017) based on oak from southern Denmark. Careful reanalysis of the dendrochronology that underpins the new 14C records based on oak material from southern Denmark reveals that the cosmic-ray event reported in Fogtmann-Schulz et al. (2017) actually took place in AD 993.

Keywords

annual datacalibration curveradiocarbon datingtree rings
Type
Conference Paper
Information
Radiocarbon , Volume 62 , Issue 4: IntCal20: Calibration Issue , August 2020 , pp. 969 - 987
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© 2019 by the Arizona Board of Regents on behalf of the University of Arizona

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