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Paper No. 5
Presentation Time: 9:05 AM


LUNDEEN, Zachary, Geography, University of Utah, 260 S. Central Campus Dr.-Rm 270, Salt Lake City, UT 84112, BRUNELLE, Andrea, Department of Geography, University of Utah, 260 S. Central Campus Dr. Room 270, Salt Lake City, UT 84112, BURNS, Stephen J., Department of Geosciences, Univ of Massachusetts Amherst, 611 N. Pleasant St, Amherst, MA 01002, ASMEROM, Yemane, Earth & Planetary Sciences, University of New Mexico, Albuquerque, NM 87131 and POLYAK, Victor J., Earth & Planetary Sciences, Univ of New Mexico, 200 Yale Blvd., Northrop Hall, Albuquerque, NM 87131,

A paired speleothem isotope record from Minnetonka Cave and a lacustrine pollen and charcoal record from Plan B Pond are presented from the Bear River Range, Southeast Idaho. These records show significant hydroclimatic variability and ecological response through the Holocene and provide data points from a dominant hydroclimatic transition zone that divides western North America into oppositely responding north and south regions. Spatiotemporal variations in hydroclimates across the American West have been correlated with large-scale Pacific climate indices such as ENSO and PDO. The relatively consistent opposing north-south response in winter precipitation to ENSO and PDO phases provides predictive insight to understanding the water resource availability in a region dependent on snowpack to support its water needs. However, within the transition zone between these well-defined northern and southern hydroclimatic response regions, predictive capabilities are much diminished due to a weaker correlation with the large-scale climate indices. Paleoclimate timeseries from this transition zones serve to inform about the transition zone location and relative climate sensitivity over time.
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