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The Stable Isotope Record of Tropical Hurricanes in Southwestern Ontario – A Test Of Concept
Presented by Ze'ev GEDALOF on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Session: Poster Session + Reception
Board #: 1
Cedars (Thuja occidentalis) that grow on the Niagara Escarpment cliff face provide a unique opportunity to examine the paleoclimate of eastern North America: they are the oldest trees east of the Rockies, they bisect Canada’s population centre, and transect the northwestern limit of tropically originating hurricane tracks – which reach southwestern Ontario approximately once per decade. These storms bring anomalously isotopically-depleted precipitation. We test the hypothesis that the oxygen isotopic composition of alpha-cellulose of cliff cedar rings formed in the year following severe tropical storms is also anomalously low. We present an annually resolved record of cellulose d18O derived from trees from three sites in Southwestern Ontario, for the period 1900–1996. If we detect a tropical storm signal in this record, we will evaluate whether these storms were more common during the Medieval Warm Period, or less common during the Little Ice Age, questions of key importance to predicting important consequences of global climatic change.
Room: Salon E