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Climate change has the potential to affect the boreal forest of Canada. Forest fires are a crucial component of the boreal ecosystem and climate change may substantially alter the fire regime. Statistical relations between climate and forest fire were obtained by regression for three fire subdistricts (Old Crow, Mayo and Watson Lake) of Yukon Territory. The relations were derived from fire and climate records, available, in general, since 1960. Summer temperature was found to be positively correlated to forest fire occurrence, area burned, the Fire Weather Index and Seasonal Severity Rating. In most cases, summer precipitation and relative humidity were negatively correlated with these variables. Climate change...
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This thesis investigates snow-pack development and frost penetration in the Blackstone Uplands, Y.T. The purpose is to assess the use of an accessible reference site as an index of these conditions throughout the area. The project responds to local interest in improving management of snowmobile access to the region. Sixteen transects were monitored for snow depth in fall and winter 2006-07. Active-layer temperature was monitored by data logger during freeze-up. Below-normal snowfall permitted examination of snow-pack development with marginal conditions for snowmobile traffic. Prior to snow redistribution by wind, snow depth was controlled by elevation and the reference site had more snow than all valley-bottom...
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The White River ash is one of the most distinct and widely dispersed pyroclastic deposits in Yukon-Alaska. It was produced from volcanic eruptions ca. 1887 (north lobe; Lerbekmo et al. 1975) and 1147 years B.P. (east lobe; Clague et al. 1995). The source of the deposit, Mount Churchill, is an ice-covered stratovolcano located 25 km west of the Yukon-Alaska border (61°25'N, 141°70'W). Distal deposits of ash occur as primary airfall over much of Alaska, Yukon, and Northwest Territories. Locally resedimented deposits of ash are common closer to the volcanic source and occur in highly glaciated regions. Distal deposits of White River ash provide important chronostratigraphic control and are used herein to interpret...
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A water balance study was carried out during summer 2003 to determine the rate of seepage from the sewage lagoon at Mayo, central Yukon Territory. The lagoon is largely dry, with over 85% of the total area covered by vegetation or bare soil. Measurements of precipitation, inflow, and pond water level, and estimates of evaporation were made to determine the rate of seepage from the lagoon. Precipitation was measured in a network of rain gauges, inflow at the Mayo lift station, and pond water level with staff gauges. Evaporation was estimated by a modified form of the Priestley-Taylor method, and from an evaporation pan placed in an infiltration pond. Daily estimates of seepage from two infiltration ponds at the lagoon...
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Climate change has the potential to affect the boreal forest of Canada. Forest fires are a crucial component of the boreal ecosystem and climate change may substantially alter the fire regime. Statistical relations between climate and forest fire were obtained by regression for three fire subdistricts (Old Crow, Mayo and Watson Lake) of Yukon Territory. The relations were derived from fire and climate records, available, in general, since 1960. Summer temperature was found to be positively correlated to forest fire occurrence, area burned, the Fire Weather Index and Seasonal Severity Rating. In most cases, summer precipitation and relative humidity were negatively correlated with these variables. Climate change...
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