Environmental Controls on Snow Cover Thickness and Water Equivalent in Two Sub-Arctic Mountain Catchments

• Main Author: Cosgrove, Christopher
• Format: Bachelor Thesis
• Language: English
• Published: Uppsala universitet, Institutionen för geovetenskaper 2015
• Subjects: Snow; hydrology; sub-Arctic; mountains; climate; landscape; Physical Geography; Naturgeografi; Arctic; Canada; Hemavan; Yukon; Northern Sweden; Tundra
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-253186

The spatial variability of snow cover characteristics (depth, density, and snow water equivalent [SWE]) has paramount importance for the management of water resources in mountain environments. Passive microwave (PM) inference of SWE from space-borne instrumentation is increasingly used but the reliability of this technique remains limited in mountainous areas. Complex topography and the transition between forest and alpine tundra vegetation zones create large spatial heterogeneities in the snowpack in such environments. A better understanding of the factors that control these heterogeneities is therefore needed to improve and extend the use of PM-derived SWE estimation to mountain settings. In this study, two seasonally snow-covered sub-Arctic mountain catchments at comparable latitudes, one in Hemavan, northern Sweden and the other in Wolf Creek, Yukon, Canada, were investigated to evaluate the relative influence of climate vs. landscape factors on the variability of snow cover characteristics. Field measurements of snowpack stratigraphy and SWE were performed at the approximate time of late winter snow depth maximum using various in situ methodologies. Regression analysis was then employed to identify possible relationships between snow depth, density and SWE, and landscape properties (altitude, slope angle and aspect) at both sites, both within and between different vegetation zones. Snow depth, density and SWE were found to be greatest in the alpine tundra zone of both catchments, and were largest in Hemavan, probably on account of the relatively warmer and wetter winter climate of northern Sweden compared to that of the Yukon. Elevation was the only quantifiable landscape property found to show a positive and significant relationship with SWE in both catchments. Notable differences in the spatial variability of snowpack properties were also found between the two study sites. The local variability of snow depth was greatest in the forest-alpine transition zone at Hemavan, but greatest in the alpine zone at ...