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    ¹⁴C Bomb Effect in Tree Rings of Tropical and Subtropical Species of Brazil

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    Author
    Lisi, Claudio S.
    Pessenda, Luiz C. R.
    Tomazello, Mario
    Rozanski, Kazimiers
    Affiliation
    ¹⁴C Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Picacicaba, Brazil
    Tree-Ring Laboratory, Department of Forest Sciences, University of São Paulo, Piracicaba, Brazil
    University of Mining and Metallurgy, Faculty of Physics and Nuclear Techniques, Krakow, Poland
    Issue Date
    2001
    Keywords
    Dendrochronology
    Tree rings
    
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    Rights
    Copyright © Tree-Ring Society. All rights reserved.
    Collection Information
    This item is part of the Tree-Ring Research (formerly Tree-Ring Bulletin) archive. It was digitized from a physical copy provided by the Laboratory of Tree-Ring Research at The University of Arizona. For more information about this peer-reviewed scholarly journal, please email the Editor of Tree-Ring Research at editor@treeringsociety.org.
    Publisher
    Tree-Ring Society
    Journal
    Tree-Ring Research
    Citation
    Lisi, C.S., Pessenda, L.C.R., Tomazello F, M., Rozanski, K. 2001. 14C bomb effect in tree rings of tropical and subtropical species of Brazil. Tree-Ring Research 57(2):191-196.
    Abstract
    Atmospheric nuclear tests in the early 1960s introduced large amounts of radiocarbon into the atmosphere, which resulted in an increase of tropospheric ¹⁴CO₂ concentration by nearly 100% during the years 1964-1965. The bomb-produced ¹⁴C was then gradually incorporated within the global carbon cycle. The history of ¹⁴C concentration in the troposphere is preserved within annual growth layers of trees and can be reconstructed for those areas where direct measurements of 14C in the atmosphere were not performed. The paper presents results of ¹⁴C activity measurements in tree rings of tropical and subtropical species from Brazil, for the period 1945-1997. We investigated two species ( Araucaria angustifolia and Parkia sp.) growing at three sites covering the latitudinal band between 7 °S and 24 °S. The results indicate that the maximum ¹⁴C activity in the Southern Hemisphere occurred in 1965, with the Δ¹⁴C values reaching around 700%. Significant differences in Δ¹⁴C were recorded among the studied sites for the period of maximal ¹⁴C levels in the atmosphere, with the highest level observed at the tropical site and lowest in the subtropical zone. This reflects the dynamics of interhemispheric transport of ¹⁴C during the years of high spatial and temporal gradients of this isotope in the atmosphere.
    ISSN
    2162-4585
    1536-1098
    Additional Links
    http://www.treeringsociety.org
    Collections
    Tree-Ring Research, Vol. 57, No. 2 (2001)

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