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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

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

Earth and planetary science letters, 2015-02, Vol.411, p.290 [Periódico revisado por pares]

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  • Título:
    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
  • Autor: Guettler, D. ; Adolphi, Florian ; Beer, J. ; Bleicher, N. ; Boswijk, G. ; Christl, M. ; Hogg, A. ; Palmer, J. ; Vockenhuber, C. ; Wacker, L. ; Wunder, J.
  • Assuntos: AD 775 ; AMS ; C-14 ; carbon cycle ; Earth and Related Environmental Sciences ; Geologi ; Geology ; Geovetenskap och miljövetenskap ; modeling ; Natural Sciences ; Naturvetenskap
  • É parte de: Earth and planetary science letters, 2015-02, Vol.411, p.290
  • Descrição: 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.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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