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13-17 May 2013
Tucson, Arizona
US/Arizona timezone
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Assessing the potential of Paraná pine (Araucaria angustifolia) for high precision Southern Hemisphere 14C calibration

Presented by Dr. Guaciara M. SANTOS on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Board #: 57

Content

Araucaria angustifolia is a native subtropical coniferous species of southern Brazil. Previously published 14C measurements on selected annual growth rings confirmed the overall profile of the Southern Hemisphere (SH) of the “bomb-pulse”, suggesting that using an annual resolution of this long-lived species for the construction of a calibration chronology curve was promising. This work reports the first high-precision 14C-AMS dating of holocellulose from 71 rings (from 1927-1997). The tree-rings analyzed here were from a single tree growing at Camamducaia, Minas Gerais. A slight depletion of atmospheric 14C after 1927 was observed, in agreement with the expected Suess effect. Our 14C results also showed the rise and rapid decrease of atmospheric 14C concentrations associated with the detonations of nuclear weapons during the late 50’s, and its subsequent uptake by other large C sinks. The agreement between this record and the SH compilation 14C data shows the potential of this tree species for older chronologies.

Place

Location: DoubleTree
Room: Salon E

Primary authors

  • Dr. Guaciara M. SANTOS Earth System Science, University of California, Irvine, B321 Croul Hall, Irvine CA 92697-3100, USA
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Co-authors

  • Dr. Claudio LISI Laboratório de Botânica: anatomia vegetal e dendroecologia, Departamento de Biologia, Universidade Federal de Sergipe, 49900-000, São Cristóvão, Sergipe, Brazil
  • Dr. Mario TOMAZELLO FILHO Escola Superior de Agricultura Luiz de Queiroz, Departamento de Ciências Florestais, Universidade de São Paulo, 13418-900, Piracicaba, SP, Brasil
  • Dr. Roberto LINARES Instituto de Física, Universidade Federal Fluminense, 24210-340, Niterói, RJ, Brazil
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