Katabatic wind

Coastal polynyas are produced in the Antarctic by katabatic winds

A katabatic wind, from the Greek word κατάβᾰσις katabasis meaning "descending", is the technical name for a drainage wind, a wind that carries high density air from a higher elevation down a slope under the force of gravity. Such winds are sometimes also called fall winds. Katabatic winds can rush down elevated slopes at hurricane speeds, but most are not as intense as that, and many are of the order of 10 knots (18 km/h) or less.

单词	Downslope wind
释义	Downslope wind 英语百科 Katabatic wind A katabatic wind, from the Greek word κατάβᾰσις katabasis meaning "descending", is the technical name for a drainage wind, a wind that carries high density air from a higher elevation down a slope under the force of gravity. Such winds are sometimes also called fall winds. Katabatic winds can rush down elevated slopes at hurricane speeds, but most are not as intense as that, and many are of the order of 10 knots (18 km/h) or less.
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Downslope wind

Katabatic wind