Tree-Ring Isotopic Composition as a Proxy for Isotopic Composition of Paleoprecipitation and Paleoclimate in the American Southwest

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Abstract ATM-9421041 Leavitt, Steven University of Arizona Title: Tree-Ring Isotopic Composition as a Proxy for Isotopic Composition of Paleoprecipitation and Paleoclimate in the American Southwest This study is intended to define relationships between isotopic composition (delD, del18O, del13C) measured in tree-rings with instrumental climate data and actual isotopic measurements of precipitation. Stable-isotopic measurements will be made on cellulose of ponderosa pine from southeastern Arizona and southern New Mexico. The delD and del18O of the trees will be calibrated with respect to a long record (12 years) of isotopic composition of precipitation from nearby Tucson, extended with other precipitation isotopic data from the IAEA network. In the long term, the connection between the tree-ring measurements and climate/source-water variables established in this study can be used to explore periods preceding the instrumental period to determine the spatial and temporal variability and strength of precipitation sources.