2005 Salt Lake City Annual Meeting (October 16–19, 2005)

Paper No. 24
Presentation Time: 8:00 AM-12:00 PM


KRAWIEC, Anne C.1, WILES, Gregory C.1 and D'ARRIGO, Rosanne D.2, (1)Geology, The College of Wooster, 1189 Beall Ave, Wooster, OH 44691, (2)Tree Ring Lab, Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, akrawiec@wooster.edu

The Pacific-North American (PNA) teleconnection pattern is significantly link to moisture variability in the Midwest. Here we investigate the possibility of combining temperature sensitive tree-ring series from the North Pacific with moisture-sensitive series from the Midwest and their potential to reconstruct hydrometeorological series including Ohio stream flow and Lake Erie levels. The North Pacific tree-ring series have been used to reconstruct the North Pacific index (NPI), a Pacific basin sea level pressure index that is highly correlated to the PNA. Midwest tree-rings are used in drought reconstructions.

Preliminary results show strong correlations between spring Lake Erie Levels and coastal North Pacific tree-ring records with a combination of North Pacific series explaining over 50% of the variation in lake levels. Coastal Alaska tree-ring series alone are significantly correlated (r = 0.41), with streamflow for October in Northeast Ohio. The NPI correlates well (r = 0 .48) with streamflow in January, whereas correlations with Midwestern tree ring chronologies are their strongest for August (r = 0 .40). These preliminary results show the complex seasonal variability of climate and tree growth and the potential to reconstruct hydrometeorological variables for the Midwest. Recent tree-ring work in Alaska and Ohio is aimed at extending the chronologies from these areas to produce reconstructions of precipitation and drought in Ohio.