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Snow Donald Alford
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accumulation adaptation Alaska alpine areas alpine regions Alps altitude Amer arctic and alpine Arctic Ocean arctic tundra Baffin Island basin birds Canada cent cold Colorado density deposits distribution Ecology ecosystems ecotone effects Ellesmere Island energy Ennadai Lake environment environmental factors fallout fellfield flora forest Front Range frost Geogr Geol glaciation glacier Greenland growth habitat heat ice sheet increase krummholz Lake latitude Laurentide ice sheet layer lemming lichens limit mammals maximum mean annual melting moisture moraines North America northern nunatak occur patterns peat periglacial period permafrost photosynthesis plants Pleistocene polar pollen polyploid populations postglacial precipitation processes production Queen Elizabeth Islands radiation radiocarbon radiocarbon dates result rock Rocky Mountains sea level season sediment slopes snow cover snowline soil solifluction species studies subalpine summer surface temperature thickness timberline Univ vegetation vole water pipit weathering wind winter zone