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Old Crow Flats is a 5600 km2 glaciolacustrine plain that straddles the forest-tundra ecotone in northern Yukon. Continuous taiga corridors occur in the entrenched river valleys, where annual mean ground temperatures (Tg) at the depth of zero annual amplitude at two locations were ?3.1 and ?4.0ºC in 2013. On the Flats, the vegetation cover is patchy, and Tg varied between ?5.1 and ?2.6ºC. Annual mean near-surface permafrost temperatures (Tps) measured on the Flats between 2008 and 2011 in patches of taiga, tall shrubs and low shrubs were correlated with local snow depth. Snow depth was controlled by vegetation height if the snow supply was not limited, for example, where low shrubs and large lakes dominate the landscape....
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RÉSUMÉ. On a calculé des rapports statistiques afin de décrire l'association qui existe entre les feux de forêt et le climat pour les districts de prévention des incendies de [Dawson] et de Mayo, dans le centre du Yukon. On a comparé la fréquence annuelle des feux, la surface brûlée et l'indice saisonnier de gravité d'incendie avec les observations estivales de la température moyenne, de la précipitation totale, de l'humidité relative moyenne et de la vitesse moyenne du vent. Les rapports ont été établis par régression multiple et combinés à des scénarios du futur climat dans la région, scénarios tirés de modèles de circulation généraux. Les associations statistiques dominantes relatives à la fréquence des feux...
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The vegetation in a retrogressive thaw slump, first surveyed and documented in 1987, was revisited 10 years later to investigate its subsequent development and to test a chronosequence-based successional model. The thaw slump stabilized in 1994, when the headwall became covered by organic and mineral debris. As a result, the meltwater supply from headwall ablation ceased. Alteration of environmental conditions due to stabilization of the headwall diverted the vegetation succession from the chronosequence determined in 1987. Areas that were marshy in 1987 dried up, and an area dominated by Polygonum alaskanum [Alaska wild rhubarb] appeared close to the headwall. Much of the thaw slump was dominated by Salix spp....
    map background search result map search result map Natural Hazards in Forests: Glacier and Permafrost Effects as Related to Climate Variability and change in the Canadian cryosphere Vegetation-Permafrost Relations within the Forest-Tundra Ecotone near Old Crow, Northern Yukon, Canada Lake-bottom thermal regime in thermokarst terrain near Mayo, Yukon Territory, Canada Permafrost conditions near shorelines of oriented lakes in Old Crow Flats, Yukon Territory    Cryostratigraphy of the Klondike "muck" deposits, west-central Yukon Territory The thermal regime of a retrogressive thaw slump near Mayo, Yukon Territory Relations between air and surface temperature in discontinuous permafrost terrain near Mayo, Yukon Territory Climate Change in Central Yukon Geometry of oriented lakes in Old Crow Flats, northern Yukon Topography of drained thermokarst lake basins in Old Crow Flats, northern Yukon Development of vegetation communities in a retrogressive thaw slump near Mayo, Yukon Territory: a 10-year assessment Potential Alteration by Climate Change of the Forest-Fire Regime in the Boreal Forest of Central Yukon Territory Development of Vegetation Communities in a Retrogressive Thaw Slump near Mayo, Yukon Territory: A 10-Year Assessment Thermal state of permafrost in North America: a contribution to the international polar year  Lake-bottom thermal regime in thermokarst terrain near Mayo, Yukon Territory, Canada The thermal regime of a retrogressive thaw slump near Mayo, Yukon Territory Relations between air and surface temperature in discontinuous permafrost terrain near Mayo, Yukon Territory Development of vegetation communities in a retrogressive thaw slump near Mayo, Yukon Territory: a 10-year assessment Permafrost conditions near shorelines of oriented lakes in Old Crow Flats, Yukon Territory    Topography of drained thermokarst lake basins in Old Crow Flats, northern Yukon Cryostratigraphy of the Klondike "muck" deposits, west-central Yukon Territory Geometry of oriented lakes in Old Crow Flats, northern Yukon Climate Change in Central Yukon Vegetation-Permafrost Relations within the Forest-Tundra Ecotone near Old Crow, Northern Yukon, Canada Potential Alteration by Climate Change of the Forest-Fire Regime in the Boreal Forest of Central Yukon Territory Thermal state of permafrost in North America: a contribution to the international polar year  Natural Hazards in Forests: Glacier and Permafrost Effects as Related to Climate Variability and change in the Canadian cryosphere