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Tree-ring perspectives on short-term climate variability during the transition during Late Pleistocene to Holocene from the Great Lakes Network of buried timbers
Presented by Dr. Irina PANYUSHKINA on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Session: Poster Session + Reception
Board #: 10
We investigate climate interannual variance and decadal variability in tree rings from the periphery of the retreating Laurentide Ice Sheet to understand how the warming atmosphere affected tree growth and how changes in atmospheric circulation altered high-frequency modes of climate variability. The Great Lakes region provides geological circumstances that favored preservation of ancient wood in glacial, alluvial, organic, aeolian, and lacustrine deposits. Currently the U.S. Great Lakes Network of buried wood counts over 50 sampled tree-ring sites spanning 14,000 BP to 2,000 BP, only about 20% of which produced well-dated, highly-replicated chronologies. Post-glacial tree-ring records of spruce (Two Creekan age and Younger Dryas) have a summer temperature signal with significant ENSO-like modes of interannual and decadal variability, which disappear from the tree-ring records after ca. 9,000 BP. Mid to Late Holocene tree-ring records of cedar, larch, pine and deciduous trees provide evidence of short-term hydrological fluctuations.