Snow Cover Patterns and Evolution at Basin Scale: GEOtop Model Simulations and Remote Sensing Observations
نویسندگان
چکیده
Remote sensing data can provide images of snow covered areas and, therefore, it is possible to follow the time evolution of snow melting spatial patterns with increasing spatial and temporal resolution. Snow cover patterns are dominated by the complex interplay of topography, radiation forcings and atmospheric turbulent transfer processes. The snow cover evolution in an alpine basin in Trentino (Italy) is here studied, comparing the simulations of the distributed hydrological model GEOtop with remotely sensed data. GEOtop describes the soil-snow-atmosphere energy and mass exchanges, taking into account the snow physics and the topographic effects of elevation, slope and aspect on solar radiation and air temperature. the Snow cover extent has been provided by MODIS 8-day composite maps with a resolution of 500 metres. The model reproduces the physical features of snow melting reasonably and shows a fair agreement with the data. The relative importance of precipitation, solar radiation, and temperature to control the snow accumulation and melting processes is also investigated.
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