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A climate regime around Lake Ontario – a seesaw between freeze and melt at the end of the Younger Dryas
Presented by Carol GRIGGS on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Session: Poster Session + Reception
Board #: 41
In central New York State, southeast of Lake Ontario, the relationship between summer temperature and relative humidity recorded in tree rings and their 13C isotope content indicate oscillations between a dry-cold regime and a wet-cool regime at the end of the Younger Dryas. This record corroborates with that found in boreal environments today, with the exception of frequency - the seesaw in the YD appears to have occurred much less frequently over time. New del-18O data indicate that while the 13C levels changed significantly over the 284-year represented period, the source of humidity remains the same. The variability in the three data sets suggest a steady anticyclonic pressure system from the North Atlantic region with ground-level temperature affected by the re-advance and recession of the ice sheet margin, adiabiatic winds, and the melting / freezing cycles caused by meltwater transport from the ice sheet at the end of the Younger Dryas.