University of Colorado: 1970 Summer Field Season in East Baffin Island
Keywords:Mustelidae, Predation, Winter ecology
Abstract... Field work continued on [the late glacial and neoglacial chronology and recent crustal movements] program with the main emphasis being shifted to Narpaing Fiord and outer Okoa Bay. Marine limits were measured at many localities in the two areas and some samples of marine shells were collected for dating ... Studies continued on the task of subdividing the glacial deposits on the basis of a number of weathering criteria such as: depth of pitting, surface texture of boulders, soil development, X-ray analysis for clay minerals and Free-iron content. The combined results suggest several episodes of glaciation with a general decrease of glacier area and volume throughout the Wisconsin. ... A tentative lichen growth-curve is being developed based on a variety of evidence, and it is considered that the graph may usefully be extended back to 8,000 or 10,000 years ago. Work on a series of corrie moraines at the heads of Narpaing and Quajon fiords suggests that the outermost south-facing moraines at 600 m.a.s.l. may be 15,000 years old whereas the north-facing moraines at 550 m.a.s.l. are 8,000 to 10,000 years old. ... A series of 7 weather stations were established at different exposures and elevations in the area between the head of Quajon and Narpaing fiords. ... Mass budgets were measured in early June and mid-August using a variety of methods. Stakes, probing and pits were used to detail the progress of melting during the ablation season. In early June the specific net budget was + 0.42 cm ± 0.06 and in mid-August was + 0.38 ± 0.06 cm water equivalent. In complete contrast to 1969, no ice was showing on the glacier and the summer melt had been compensated by snowfalls throughout the "ablation" season. Surface lowering amounted to about 45 cm of snow and this was nearly identical to the mass added in the growth of superimposed ice. Because of low temperatures the glacier was acting nearly as a closed system. ...