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GEOREF RECORD

Interpreting paleoclimate from (super 18) O and (super 2) H in plant cellulose; comparison with evidence from fossil insects and relict permafrost in southwestern Ontario

T. W. D. Edwards, R. O. Aravena, Peter Fritz and A. V. Morgan
Interpreting paleoclimate from (super 18) O and (super 2) H in plant cellulose; comparison with evidence from fossil insects and relict permafrost in southwestern Ontario
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (November 1985) 22 (11): 1720-1726

Abstract

The O-isotope content of terrestrial plant cellulose is related to that of the source waters by a two-step process involving evapo-transpirative leaf-water enrichment and equilibrium isotopic exchange between leaf-water and atmospheric CO (sub 2) . A combination of two models that describe these steps yields consistent agreement between measured and predicted climatic and isotopic data. The value of the combined model for palaeoclimatic reconstruction has been tested using fossil wood from a late glacial site at Brampton, Ontario. Estimates of past relative humidity were derived from the divergence between measured delta (super 18) O values of fossil wood cellulose and environmental water isotopic compositions inferred from the C-bound deuterium contents of the cellulose. Growing conditions were apparently substantially drier than those present between approx 11 500 and 8700 yr BP, at a time when coniferous forests predominated in SW Ontario. A shift in the inferred meteoric water composition over this period suggests a gradual increase in mean annual T of approx 2 or 3 degrees C, in agreement with estimates of T change based on palaeo-entomological data.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 22
Serial Issue: 11
Title: Interpreting paleoclimate from (super 18) O and (super 2) H in plant cellulose; comparison with evidence from fossil insects and relict permafrost in southwestern Ontario
Affiliation: Univ. Waterloo, Dep. Earth Sci., Waterloo, ON, Canada
Pages: 1720-1726
Published: 198511
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 38
Accession Number: 1986-011178
Categories: Quaternary geologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Quat. Entomol. Lab.; Contrib. No. 78
Illustration Description: illus. incl. 2 tables
N43°45'00" - N43°45'00", W79°40'00" - W79°40'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1986
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