ナショナルジオグラフィックのインスタグラム(natgeo) - 12月30日 22時54分

Iphone photo by @gabrielegalimbertiphoto.
Hoar frost in Tuscany, Italy. - Hoar frost refers to white ice crystals, deposited on the ground or loosely attached to exposed objects such as wires or leaves. They form on cold, clear nights when conditions are such that heat radiates out to the open sky faster than it can be replaced from nearby sources such as wind or warm objects. Under suitable circumstances, objects cool to below the frost point of the surrounding air, well below the freezing point of water. Such freezing may be promoted by effects such as flood frost or frost pocket. These occur when ground-level radiation losses cool air till it flows downhill and accumulates in pockets of very cold air in valleys and hollows. Hoar frost may freeze in such low-lying cold air even when the air temperature a few feet above ground is well above freezing
#tuscany #hoarfrost #ice #cold #winter #italy #nature #trees

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