A 300 year record of environmental change from Lake Tuborg, Ellesmere Island, Nunavut, Canada |
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| Authors: | Sheldon V Smith Raymond S Bradley Mark B Abbott |
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| Institution: | (1) Woodard & Curran, 41 Hutchins Drive, Portland, ME 04102, USA;(2) Climate System Research Center, Department of Geosciences, University of Massachusetts, Amherst, MA 01003–9297, USA;(3) Department of Geology and Planetary Science, University of Pittsburgh, 4107 O’Hara Street, Room 200 SRCC, Pittsburgh, PA 15260, USA |
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| Abstract: | Lamination thickness measurements in sediments from Lake Tuborg, northern Ellesmere Island, Canada document an increase in high-energy hydrologic discharge events from ∼1865 to 1962. The timing of these events corresponds with evidence for an increase in the amount of melt on the adjacent Agassiz Ice Cap, as recorded in ice cores. There appears to have been a non-linear change in depositional energy resulting from a dramatic increase in Agassiz meltwater discharge, particularly after ∼1908. A strong correlation between the Lake Tuborg varve thickness record, the amount of melting on the Agassiz Ice Cap and Eureka 900 mb air temperature records suggests that changes in the height of the freezing level in the atmosphere have affected the extent of summer melting on the Agassiz Ice Cap, leading to high volume discharge events and associated sediment flux to Lake Tuborg. |
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| Keywords: | Arctic Paleoclimate Paleohydrology Paleolimnology Varves |
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