South American tree rings show declining δ13C trend

S. W. Leavitt, A. Lara

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

A composite, 290-year tree-ring δ13C chronology was developed from a site in Chile where 5 Fitzroya cupressoides (alerce) trees were sampled. This chronology shows a decreasing δ13C trend of approximately 1.2‰, primarily since the turn of this century. This is the first evidence for any interhemispheric reproducibility of tree-ring δ13C chronologies, and furthermore, the Fitzroya δ13C trend conforms well to that of δ13C of atmospheric CO2 determined from ice cores and direct measurements. This correspondence suggests the alerce δ13C trend has not been substantially influenced by systematic changes in environmental factors such light, relative humidity and soil moisture or by changing atmospheric CO2 concentration, all of which are, in theory, capable of altering Ci/Ca ratios and obscuring the atmospheric δ13C record contained in the tree rings. -from Authors

Original languageEnglish (US)
Pages (from-to)152-157
Number of pages6
JournalTellus, Series B
Volume46 B
Issue number2
StatePublished - Jan 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Atmospheric Science

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