Collaborative Research: Laminated Lake Sediments from the Canadian High Arctic: Understanding the Climatic Signal for Paleoclimatic Reconstruction

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Abstract ATM-9322768 Retelle, Michael J. Bates College Title: Laminated Lake Sediments from the Canadian High Arctic: Understanding the Climatic Signal for Paleoclimatic Reconstruction Synopsis. Ice core and other paleoclimatic records from the High Arctic suggest that summer temperatures reached minimum levels for the entire Holocene during the last 500 years, but underwent a dramatic reversal in the last 100 years. This award, under the Paleoclimate from Arctic Lakes and Estuaries (PALE) program is designed to study lake sediments from a number of sites to determine if this hypothesis is supported by the sedimentary record. To better understand the paleoclimatic signal in the sediments, a three year process-based study is planned to determine the primary controls on sediments flux and varved sediment formation in Sophia Lake, a High Arctic hypersaline, meromictic lake. Sophia Lake provides a simple topographic environment, which will facilitate efforts to isolate the primary climatic forcing. Sediments from lakes on the margin of Agassiz Ice Cap will also be recovered in order to link the paleoclimatic record of ice cores from the ice cap to sedimentary records from the glacier margin,