~ New refraction technique suggests that snow on ground behaves exactly as on sea ice which is :
Top of wide span 100% snow layer T*** is always colder or equal than surface Temperature
(A snow layer is not freshly fallen snow, it is a layer on ground more than several days old)
~ Taken on a wider Global scale we can identify where the areas with most snow cover lay.
Confused? Just where are the areas with most snow cover? If we go by a simple gathered by optical refraction rule:
It means that all places with important thick cover will be cooler than normal, because the sun, although weaker by low elevation, would warm the ground more if bare, which was heated up by the summer. So we look for places with cooler temperature anomalies, given that even with warm or cold air advection, time will bring out the cooler locations: