Excursions in the 14C record at AD 774-775 from tree rings from Russia and America
Author
Panyushkina, IrinaJull, A. J. Timothy
Lange, Todd E.
Kukarskih, Vladimir V.
Myglan, Vladimir S.
Clark, Kelley J.
Salzer, Matthew W.
Burr, George S.
Leavitt, Steven W.
Affiliation
Laboratory of Tree-Ring Research, University of ArizonaIssue Date
2014
Metadata
Show full item recordPublisher
AGU PublicationsCitation
Jull A.J.T., Panyushkina I.P., Lange T.E., Kukarskih V.V., Clark K.J., Myglan V.S., Salzer M., Burr G.S., Leavitt S.L. 2014. Excursions in the 14C record at AD 774-775 from tree rings from Russia and America. Geophysical Research Letters 41 (8): 3004–3010. 10.1002/2014GL059874Journal
Geophysical Research LettersRights
© 2014. American Geophysical Union. All Rights Reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
he calibration of radiocarbon dates by means of a master calibration curve has been invaluable to Earth, environmental and archeological sciences, but the fundamental reason for calibration is that atmospheric radiocarbon content varies because of changes in upper atmosphere production and global carbon cycling. Improved instrumentation has contributed to high-resolution (interannual) radiocarbon activity measurements, which have revealed sudden and anomalous activity shifts previously not observed at the common resolution of 5–10 years of most of the calibration scale. One such spike has been recently reported from tree rings from Japan and then again in Europe at A.D. 774–775, for which we report here our efforts to both replicate its existence and determine its spatial extent using tree rings from larch at high latitude (northern Siberia) and bristlecone pine from lower latitude (the White Mountains of California). Our results confirm an abrupt ~ 15‰ 14C activity increase from A.D. 774 to 776, the size and now the hemispheric extent of which suggest that an extraterrestrial influence on radiocarbon production is most likely responsible.Note
6 month embargo; published online: 25 April 2014ISSN
0094-8276EISSN
1944-8007Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1002/2014GL059874