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Convection causes it to rise, causing a valley breeze. At night, the process is reversed. During the night the slopes get cooled and the dense air descends into the valley as the mountain wind. [4] These breezes occur mostly during calm and clear weather. Mountain and valley breezes are other examples of local winds caused by an area's geography.
Cierzo (cool north/northwesterly wind on Ebro Valley in Spain) Crivăț (strong, very cold north-easterly wind in Moldavia, Dobruja, and the Bărăgan Plain parts of Romania.) Etesian (Greek name) or Meltem (Turkish name) (northerly across Greece and Turkey) Euro (a warm and usually moderate wind from Africa that reaches the Ionian coast of Italy)
At night, the sides of the hills cool through radiation of the heat. The air along the hills becomes cooler and denser, blowing down into the valley, drawn by gravity. This is known a mountain breeze. If the slopes are covered with ice and snow, the mountain breeze will blow during the day, carrying the cold dense air into the warmer, barren ...
Examples of katabatic winds include the downslope valley and mountain breezes, the piteraq winds of Greenland, the moderate Bora in the Adriatic, [2] the Bohemian Wind or Böhmwind in the Ore Mountains, the Santa Ana in southern California, the oroshi in Japan, or "the Barber" in New Zealand [3].
A: Sea breeze (occurs at daytime), B: Land breeze (occurs at nighttime) In coastal regions, sea breezes and land breezes can be important factors in a location's prevailing winds. The sea is warmed by the sun more slowly because of water's greater specific heat compared to land. As the temperature of the surface of the land rises, the land ...
These winds typically occur during the daytime in calm sunny weather. A hill or mountain top will be radiatively warmed by the Sun which in turn heats the air just above it. Air at a similar altitude over an adjacent valley or plain does not get warmed so much because of the greater distance to the ground below it.
This page was last edited on 16 December 2024, at 21:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Usually, within the lower atmosphere (the troposphere) the air near the surface of the Earth is warmer than the air above it, largely because the atmosphere is heated from below as solar radiation warms the Earth's surface, which in turn then warms the layer of the atmosphere directly above it, e.g., by thermals (convective heat transfer). [3]
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