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Cold-air pools mostly form with a night time temperature inversion on clear nights and calm winds. The ground loses energy by radiation and the air in contact with it cools down by conduction until sunrise. When this process occurs on mountain slopes, the cooling air becomes denser than the air
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Because of the stagnant nature of the cold-air pools, they will trap pollutants, causing serious health risks in urban areas. With the temperature inversion, rain produced at altitude by an approaching weather system will become
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Man-made barriers can also promote the formation of a cold-air pools. For example, when railways or roads traverse a slight slope horizontally, embankments can be high enough to capture cold air over a significant area.
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at night along the slopes and sinks down, as it is denser than the surrounding air, settling at the bottom of the depression. The cold dome is trapped by the surrounding higher terrain until a change of
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155:"Risques de gel accru liés à la présence d'ouvrages linéaires en remblai: Le cas des lignes nouvelles du TGV Méditerranée et de la future ligne du TGV Est européen"
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at the surface if the temperature in the pool is below freezing. The stagnation also reduces the electrical production of
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is an accumulation of cold air in a topographic depression, such as a valley or basin. The cold air is produced by
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The air cools down at night and sinks (top) while daytime heating breaks the temperature inversion (bottom).
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Cold-air pools have impacts on vegetation and agriculture by increasing the risk of frost.
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Quenol, Hervé; Beltrando, Gérard; Bridier, Sébastien (2007-06-01).
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Accumulation of cold air in a topographic depression
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198:"Predicting persistent cold pool events"
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130:"Cold-Air Pools in Mountain Valleys"
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