Rapid increase in cosmogenic C-14 in AD 775 measured in New Zealand kauri trees indicates short-lived increase in C-14 production spanning both hemispheres

D. Guettler, Florian Adolphi, J. Beer, N. Bleicher, G. Boswijk, M. Christl, A. Hogg, J. Palmer, C. Vockenhuber, L. Wacker, J. Wunder

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

69 Citeringar (SciVal)

Sammanfattning

In 2012, Miyake et al. reported a sudden and strong increase of the atmospheric radiocarbon (C-14) content in Japanese cedar trees of 1.2% between AD 774 and 775. While their findings were quickly confirmed by a German oak chronology for the Northern Hemisphere (NH), the question remained if the effect was seen in both hemispheres. Here we present the first annually resolved Southern Hemisphere (SH) C-14 record spanning the interval AD 760-787, using New Zealand kauri (Agathis australis) chronology wood. An almost identical distinct increase compared to Northern Hemisphere data was observed, suggesting a cosmic event with globally uniform impact as a potential cause for the increase. Deploying a carbon cycle box model a worldwide averaged net C-14 production of 2.2 x 10(8) C-14 atoms cm(-2) was estimated, which is 3.7 times higher than the average annual C-14 production. The immediate appearance of the event in tree rings on both hemispheres suggests a short duration event of significantly less than 1 yr.
Originalspråkengelska
Sidor (från-till)290-297
TidskriftEarth and Planetary Science Letters
Volym411
DOI
StatusPublished - 2015

Ämnesklassifikation (UKÄ)

  • Geologi

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