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4270947 
Journal Article 
Global peak in atmospheric radiocarbon provides a potential definition for the onset of the anthropocene epoch in 1965 
Turney, CSM; Palmer, J; Maslin, MA; Hogg, A; Fogwill, CJ; Southon, J; Fenwick, P; Helle, G; Wilmshurst, JM; Mcglone, M; Bronk Ramsey, C; Thomas, Z; Lipson, M; Beaven, B; Jones, RT; Andrews, O; Hua, Q 
2018 
Yes 
Scientific Reports
EISSN: 2045-2322 
3293 
English 
Anthropogenic activity is now recognised as having profoundly and permanently altered the Earth system, suggesting we have entered a human-dominated geological epoch, the 'Anthropocene'. To formally define the onset of the Anthropocene, a synchronous global signature within geological-forming materials is required. Here we report a series of precisely-dated tree-ring records from Campbell Island (Southern Ocean) that capture peak atmospheric radiocarbon (14C) resulting from Northern Hemisphere-dominated thermonuclear bomb tests during the 1950s and 1960s. The only alien tree on the island, a Sitka spruce (Picea sitchensis), allows us to seasonally-resolve Southern Hemisphere atmospheric14C, demonstrating the 'bomb peak' in this remote and pristine location occurred in the last-quarter of 1965 (October-December), coincident with the broader changes associated with the post-World War II 'Great Acceleration' in industrial capacity and consumption. Our findings provide a precisely-resolved potential Global Stratotype Section and Point (GSSP) or 'golden spike', marking the onset of the Anthropocene Epoch. 
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