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  • Integrated Watershed-Scale Response to Climate Change in Selected Basins across the United States x
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Mark C. Mastin, Katherine J. Chase, and R. W. Dudley

, with western Canada and coastal Alaska showing the most change ( Stewart et al. 2005 ; Stewart 2009 ). Recent studies in the northeastern United States have demonstrated strong and consistent evidence of hydrologic changes over the last 30–150 years that is consistent with warming winter–spring air temperatures, including significant changes toward earlier winter/spring snowmelt runoff, decreasing duration of ice on rivers and lakes, decreasing ratio of snowfall to total precipitation, and denser

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David M. Bjerklie, Thomas J. Trombley, and Roland J. Viger

thresholds that control the balance of snow- and rain-dominated hydrological responses. Several authors have pointed out that various hydrologic states in snow-dominated regions of the United States and Canada are sensitive to climate change, including the phase of precipitation (e.g., Huntington et al. 2004 ; Knowles et al. 2006 ), snowpack trends ( Hamlet et al. 2005 ), frozen soil ( Cherkauer and Lettenmaier 2003 ), winter–spring streamflows ( Hodgkins and Dudley 2006 ), lake ice-out dates

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