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Hartl, Lea; Fischer, Andrea; Olefs, Marc
Global and planetary change, August 2018, 2018-08-00, Volume: 167Journal Article
Ski resorts increasingly rely on snow making to ensure good quality skiing regardless of the variability of the natural snow cover. This study aims to quantify past changes in snow making conditions based on an analysis of long-term wet bulb temperature time series from 20 weather stations in Germany and Austria. The weather stations are located at a range of altitudes from 267 m to 3109 m, in the vicinity of ski resorts. The lengths of the time-series range from 54 to 83 years. Using a threshold mean daily wet bulb temperature of −2 °C we define ‘potential snow making days’ and track changes in the number of snow making days in the months of the early skiing season (October, November, December) by computing linear trends, comparing consecutive 20 year periods, and Mann-Kendall trend testing of overlapping sub-periods. The number of snow making days changes least in October and most in December when averaged over all stations. Very high stations show more change in October and less change in December than the lower stations. Several stations show a significant decrease of snow making days per month, particularly in more recent sub-periods, but trends vary strongly between stations and for different sub-periods. Sub-periods with positive trends are present in earlier phases of the time series at some stations and inter-annual variability is generally 1–2 orders of magnitude greater than detected trends. Detailed microclimatic studies are necessary to determine potential future effects of changes in snow making conditions on the scale of a ski resort. •We use daily wet bulb temperature time series as a measure for snow making conditions.•Inter-annual variability is large compared to detected trends.•Significant trends for snowmaking days are largely negative in recent years, varying with altitude and location.
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