Snow-albedo feedback and Swiss spring temperature trends |
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| Authors: | S C Scherrer P Ceppi M Croci-Maspoli C Appenzeller |
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| Institution: | 1. Climate Division, Federal Office of Meteorology and Climatology MeteoSwiss, Z??rich, Switzerland
2. Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA
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| Abstract: | We quantify the effect of the snow-albedo feedback on Swiss spring temperature trends using daily temperature and snow depth measurements from six station pairs for the period 1961?C2011. We show that the daily mean 2-m temperature of a spring day without snow cover is on average 0.4?°C warmer than one with snow cover at the same location. This estimate is comparable with estimates from climate modelling studies. Caused by the decreases in snow pack, the snow-albedo feedback amplifies observed temperature trends in spring. The influence is small and confined to areas around the upward-moving snow line in spring and early summer. For the 1961?C2011 period, the related temperature trend increases are in the order of 3?C7?% of the total observed trend. |
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