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John Risley, Hamid Moradkhani, Lauren Hay, and Steve Markstrom

1. Introduction Findings from Bernstein et al. ( Bernstein et al. 2007 ) describe how climate change resulting from increasing anthropogenic greenhouse-gas concentrations in the atmosphere will cause spatial and temporal alterations in the distribution of water resources in river drainage basins during the twenty-first century. To analyze potential shifts in water resources, climate output from general circulation models (GCMs) has often been input to hydrologic models that are used to simulate

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Mark C. Mastin, Katherine J. Chase, and R. W. Dudley

River basin is on the lee side of the Cascade Range, and the highest elevations of the basin are along its western margin, which continues to maintain a spring snowpack even for warmer 2090 conditions. The lower, arid parts on the eastern side of the basin, as well as the valley bottoms in the center of the basin, did not have a spring snowpack even in 2006; thus, the greatest change in SCA occurs in the middle, mid-elevation portion of the basin on the valley slopes and ridge tops. Figure 2

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Lauren E. Hay, Steven L. Markstrom, and Christian Ward-Garrison

temperature and precipitation to estimate the daily variation in solar radiation at the surface and daily temperature of the evaporation surfaces. The JH method does not explicitly account for daily variation in relative humidity and assumes complete mixing of the atmosphere above the evaporation surface and hence does not explicitly account for variation in the near-surface vapor pressure gradient and mass transfer of vapor into the atmosphere. 3.1.2. PRMS calibration and evaluation The PRMS models used

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