Δ14C PEAKS APPEARING IN EARLYWOOD AND LATEWOOD TREE RINGS (AD 770–780) IN NORTHEASTERN ARIZONA

The AD 775 peak in Δ14C (henceforth, M12) was first measured by Miyake et al. and has since been confirmed globally. Here we present earlywood and latewood Δ14C values from tree rings of pinyon pine (Pinus edulis) from Mummy Cave, Canyon de Chelly National Monument, Chinle, Arizona, USA, for the per...

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Bibliographic Details
Published inRadiocarbon Vol. 63; no. 1; pp. 223 - 228
Main Authors Park, J H, Southon, J, Seo, JW, Creasman, P P, Hong, W, Park, G, Sung, K H
Format Journal Article
LanguageEnglish
Published New York, USA Cambridge University Press 01.02.2021
Subjects
Cosmic rays
Gamma rays
National monuments
Nuclear tests
Stratosphere
Tree rings
Canyon de Chelly
Northern Hemisphere
United States > US
Arizona
subannual tree ring
Δ14C in AD 775
earlywood and latewood
M12
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Summary:The AD 775 peak in Δ14C (henceforth, M12) was first measured by Miyake et al. and has since been confirmed globally. Here we present earlywood and latewood Δ14C values from tree rings of pinyon pine (Pinus edulis) from Mummy Cave, Canyon de Chelly National Monument, Chinle, Arizona, USA, for the period AD 770–780. These data reconfirm the timing of M12 and show a small rise in Δ14C in AD 774 latewood. Allowing for the delay in lateral transfer of radiocarbon produced at high latitude, this suggests that 14C peak production occurred in late winter or spring of AD 774. Additionally, Δ14C decreased slightly in the earlywood of AD 775 and increased in the latewood of AD 775 to a higher level than that observed in AD 774.
ISSN:0033-8222
1945-5755
DOI:10.1017/RDC.2020.108