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dc.contributor.advisorMacLeod, Kenneth G., 1964-eng
dc.contributor.authorLepley, Scotteng
dc.coverage.spatialMissourieng
dc.coverage.temporal1900-1999eng
dc.date.issued2009eng
dc.date.submitted2009 Summereng
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on September 15, 2010).eng
dc.descriptionThe entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.eng
dc.descriptionDissertation advisor: Dr. Kenneth MacLeod.eng
dc.descriptionVita.eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionPh. D. University of Missouri--Columbia 2009.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Geological sciences.eng
dc.description.abstractA 504-year tree ring carbon isotopic time series was generated using samples from living and subfossil white oak trees from northern Missouri. Over the interval from 1931-2002 [delta]¹³C is significantly correlated with summer (June-August) precipitation. The 504-year long record suggests that that numerous past summers had precipitation extremes (wet and dry) larger and longer than any 20th century events, including the 1993 Great Flood and the 1930s Dust Bowl period. These results suggest that precipitation extremes larger than have been seen in the past century are part of the "natural" variability of the Midwest, regardless of any effects resulting from anthropogenic related climate changes. An oxygen isotope pilot study from 1975-2002 shows higher correlations to summer drought (PDSI) and precipitation than carbon isotopes over the same interval. Results from this study demonstrate that tree ring [delta]¹³C and [delta]¹⁸O measurements can provide a detailed annual isotopic record of climate variability beyond instrumental records in the central Midwest and more importantly beyond human induced anthropogenic influences.eng
dc.format.extentxi, 164 pageseng
dc.identifier.oclc696650248eng
dc.identifier.urihttps://hdl.handle.net/10355/9677
dc.identifier.urihttps://doi.org/10.32469/10355/9677eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcommunityUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.subject.lcshClimatology -- Historyeng
dc.subject.lcshPrecipitation anomalieseng
dc.subject.lcshDendrochronologyeng
dc.subject.lcshTrees -- Age determinationeng
dc.titleMidwestern climate records from tree ring [delta]¹³C and [delta]¹⁸O valueseng
dc.typeThesiseng
thesis.degree.disciplineGeological sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelDoctoraleng
thesis.degree.namePh. D.eng


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