CGRG Bibliography of Canadian Geomorphology
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Author : Francus, P.; and Bradley, R.S.
Date : 2004.
Title : An annually resolved 2500 yr long record of rain events in a polar desert.
Publication : American Geophysical Union Fall Meeting. December 13-17, 2004. San Francisco, California.
Issue :
Page(s) :
Abstract
Varved sediments of Sawtooth lake, Nunavut Canada contain a ~2500 years long record of past environments. Sediment accumulation is mainly due to spring snowmelt that forms silty laminations grading into clay. However, coarser non-erosive sand beds frequently interrupt this regular sedimentation. Field observation and evidences from the analysis of the sediment, mainly from thin-sections, point out that these coarse beds are due to summer rain events. Results from the analysis of the occurrence of these events are presented. We investigate both short (interannual) and long (centennial) scale variability. We also investigate the possibility of geomorphic influences on the delivery of sediment to the lake basin. Our preliminary data reveal that the so-called medieval period might have been characterized by rainy summers in this part of the Arctic.
Bibliography of Canadian Geomorphology