Persistent Link:
http://hdl.handle.net/10150/251653
Title:
¹⁴C Bomb Effect in Tree Rings of Tropical and Subtropical Species of Brazil
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
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.
Keywords:
Dendrochronology; Tree rings
ISSN:
2162-4585; 1536-1098
Additional Links:
http://www.treeringsociety.org

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.title¹⁴C Bomb Effect in Tree Rings of Tropical and Subtropical Species of Brazilen_US
dc.contributor.authorLisi, Claudio S.en_US
dc.contributor.authorPessenda, Luiz C. R.en_US
dc.contributor.authorTomazello, Marioen_US
dc.contributor.authorRozanski, Kazimiersen_US
dc.contributor.department¹⁴C Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Picacicaba, Brazilen_US
dc.contributor.departmentTree-Ring Laboratory, Department of Forest Sciences, University of São Paulo, Piracicaba, Brazilen_US
dc.contributor.departmentUniversity of Mining and Metallurgy, Faculty of Physics and Nuclear Techniques, Krakow, Polanden_US
dc.date.issued2001-
dc.rightsCopyright © Tree-Ring Society. All rights reserved.en_US
dc.description.collectioninformationThis 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.en_US
dc.publisherTree-Ring Societyen_US
dc.identifier.journalTree-Ring Researchen_US
dc.identifier.citationLisi, 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.en_US
dc.description.abstractAtmospheric 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.en_US
dc.subjectDendrochronologyen_US
dc.subjectTree ringsen_US
dc.identifier.citationLisi, 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.en_US
dc.identifier.issn2162-4585-
dc.identifier.issn1536-1098-
dc.identifier.urihttp://hdl.handle.net/10150/251653-
dc.identifier.journalTree-Ring Researchen_US
dc.typeArticleen_US
dc.relation.urlhttp://www.treeringsociety.orgen_US
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