TY - Generic T1 - Untangling Climate and Wildfire Influences from Snow Water Equivalent Measurements on the Deer Park, Washington Snow Course T2 - 76th Annual Western Snow Conference Y1 - 2008 A1 - Drake, E. A1 - DeSisto, C. A1 - McDonald, S. A1 - Evans, S. A1 - Barry, D. A1 - Baccus, B. KW - Deer Park fire, Olympic National Park, snow course, SWE, PDO, ENSO, snowpack decline AB - In 1988, the Deer Park Fire burned 170 acres within Olympic National Park, WA. The wildfire burned up to the southern end of the NRCS/NPS Deer Park Snow Course. The burn eliminated a forest stand downwind and down-slope of the snow course; this study reports on a potential decline in snow water equivalent (SWE) measured by the course as a result of this adjacent change in forest cover. Regional climate trends based on Pacific Decadal Oscillation (PDO) and El NiƱo Southern Oscillation (ENSO) were incorporated into the evaluation, allowing the wildfire's impacts to be isolated from climatic variability. A comparison of mean SWE values before (1949-1988) and after (1989-2007) the wildfire for every reporting month in every climate cycle showed a clear trend of a decline after the wildfire; these differences are statistically significant in April and May for all climate cycles except for positive PDO+negative ENSO. Overall, estimates of effect size of the difference between means were uniformly negative and as low as 2.9 for February 1 snowpack in warm, dry climate cycles and as high as 17.1 for May 1 snowpack in cool, wet climate cycles. JF - 76th Annual Western Snow Conference T3 - Proceedings of the 76th Annual Western Snow Conference PB - Western Snow Conference CY - Hood River, OR UR - sites/westernsnowconference.org/PDFs/2008Drake.pdf ER -