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Fluctuation of atmospheric C 14 during the last six millennia

1966; American Geophysical Union; Volume: 71; Issue: 4 Linguagem: Inglês

10.1029/jz071i004p01055

2156-2202

Paul E. Damon, Austin Long, Donald C. Grey,

Archaeology and ancient environmental studies

Journal of Geophysical Research (1896-1977)Volume 71, Issue 4 p. 1055-1063 Fluctuation of atmospheric C14 during the last six millennia Paul E. Damon, Paul E. DamonSearch for more papers by this authorAustin Long, Austin LongSearch for more papers by this authorDonald C. Grey, Donald C. GreySearch for more papers by this author Paul E. Damon, Paul E. DamonSearch for more papers by this authorAustin Long, Austin LongSearch for more papers by this authorDonald C. Grey, Donald C. GreySearch for more papers by this author First published: 15 February 1966 https://doi.org/10.1029/JZ071i004p01055Citations: 64AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract The initial C14 contents of dendrochronologically dated tree rings have been determined for samples covering the entire range of the present tree-ring chronology which extends back to 3750 B.C. The initial C14 content is within ±15‰ of the 1850 A.D. value during the Christian era, except for the period between 1500 and 1700 A.D. (T1/2 = 5730 years). During that time Δ fluctuates between about 0 and +30‰. There is a steady increase of about 4 mille per 100 years from 100 B.C. and continuing through the oldest dendrochronologically dated tree rings (California bristlecone, 3755 B.C.). The key date for the Egyptian Middle Kingdom astronomical chronology is the seventh year of the reign of Pharaoh Sesostris III of the Twelfth Dynasty. Wood samples associated with the reign of Sesostris III indicate a Δ value greater than 35‰, which is consistent with the contemporaneous bristlecone pine tree ring Δ value of 67‰. There no longer seems to be reasonable doubt concerning the reality of the fluctuation of the C14 content of the atmosphere during historic time. The extent of variation during prehistoric time has yet to be established and the causal factors remain obscure. There appears to be a correlation between initial C14 and climate. 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