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Pomeroy, J. W.

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This study considers the effects of spatial variability of driving variables on upscaling point estimates of snowmelt infiltration to frozen soil to the basin scale. Previous research led to the development of a parametric relationship between infiltration to frozen soil and soil temperature and moisture (water + ice) content at the onset of melt, and infiltration opportunity time (period of application of meltwater to soil). Reasonable success was achieved in field-testing the parametric relationship in forest, shrub and tundra sites in a mountainous, sub-arctic watershed in southern Yukon, Canada. It was determined that the primary governing parameters of snowmelt infiltration into frozen ground in this environment...
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Accurate representations of subsurface flow in hydrologic models of permafrost terrain during spring thaw require an understanding of soil thaw and soil thaw rates. Field data, including daily photographs for snowcover estimation and meteorological measurements, and measurements of soil thaw depth, soil temperature and soil moisture content, were acquired on an organic-covered hillslope in Granger Basin, Yukon Territory, to quantify relationships between net radiation and soil thaw energy. The infiltration and freezing of meltwater into the soil likely contributes to pre-thaw warming. When this energy (1.82 MJ m super(-2)d super(-1)) is taken into consideration, the daily mean contribution to soil thaw from net...
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