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Temperature-sensed snow cover
Temperature sensors can be wrapped in plastic wrap and buried 3-5 cm below the soil surface to record diurnal fluctuations in soil temperature. When the temperature reads 0 deg C with no fluctuations, we know that the location is covered with snow.
Reference:
Lundquist, J. D. and F. Lott, 2008 Using inexpensive temperature sensors to monitor the duration and heterogeneity of snow-covered areas in complex terrain. Water Resources Research, special issue on Measurement Methods, 44, W00D16, doi:10.1029/2008WR007035.
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