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dc.contributor.authorPanyushkina, Irina
dc.contributor.authorJull, A. J. Timothy
dc.contributor.authorLange, Todd E.
dc.contributor.authorKukarskih, Vladimir V.
dc.contributor.authorMyglan, Vladimir S.
dc.contributor.authorClark, Kelley J.
dc.contributor.authorSalzer, Matthew W.
dc.contributor.authorBurr, George S.
dc.contributor.authorLeavitt, Steven W.
dc.date.accessioned2018-09-06T23:33:47Z
dc.date.available2018-09-06T23:33:47Z
dc.date.issued2014
dc.identifier.citationJull 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. 10.1002/2014GL059874en_US
dc.identifier.issn0094-8276
dc.identifier.doi10.1002/2014GL059874
dc.identifier.urihttp://hdl.handle.net/10150/628657
dc.description.abstracthe 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.en_US
dc.language.isoenen_US
dc.publisherAGU Publicationsen_US
dc.rights© 2014. American Geophysical Union. All Rights Reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleExcursions in the 14C record at AD 774-775 from tree rings from Russia and Americaen_US
dc.typeArticleen_US
dc.identifier.eissn1944-8007
dc.contributor.departmentLaboratory of Tree-Ring Research, University of Arizonaen_US
dc.identifier.journalGeophysical Research Lettersen_US
dc.description.note6 month embargo; published online: 25 April 2014en_US
dc.description.collectioninformationThis 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.en_US
dc.eprint.versionFinal published versionen_US
refterms.dateFOA2014-10-03T00:00:00Z


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