Cold-air damming (original) (raw)
Le blocage d'air froid est un phénomène météorologique qui consiste au blocage et au refroidissement d'une masse d'air au pied d'une chaîne de montagnes. La création d'un blocage d'air froid implique généralement un système de haute pression situé entre le pôle et une chaîne de montagnes. Le système de haute pression amène de l'air froid du nord et l'emprisonne dans une mince couche d'air au pied des montagnes.
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| dbo:abstract | Cold air damming, or CAD, is a meteorological phenomenon that involves a high-pressure system (anticyclone) accelerating equatorward east of a north-south oriented mountain range due to the formation of a barrier jet behind a cold front associated with the poleward portion of a split upper level trough. Initially, a high-pressure system moves poleward of a north-south mountain range. Once it sloshes over poleward and eastward of the range, the flow around the high banks up against the mountains, forming a barrier jet which funnels cool air down a stretch of land east of the mountains. The higher the mountain chain, the deeper the cold air mass becomes lodged to its east, and the greater impediment it is within the flow pattern and the more resistant it becomes to intrusions of milder air. As the equatorward portion of the system approaches the cold air wedge, persistent low cloudiness, such as stratus, and precipitation such as drizzle develop, which can linger for long periods of time; as long as ten days. The precipitation itself can create or enhance a damming signature, if the poleward high is relatively weak. If such events accelerate through mountain passes, dangerously accelerated mountain-gap winds can result, such as the Tehuantepecer and Santa Ana winds. These events are seen commonly in the northern Hemisphere across central and eastern North America, south of the Alps in Italy, and near Taiwan and Korea in Asia. Events in the southern Hemisphere have been noted in South America east of the Andes. (en) Le blocage d'air froid est un phénomène météorologique qui consiste au blocage et au refroidissement d'une masse d'air au pied d'une chaîne de montagnes. La création d'un blocage d'air froid implique généralement un système de haute pression situé entre le pôle et une chaîne de montagnes. Le système de haute pression amène de l'air froid du nord et l'emprisonne dans une mince couche d'air au pied des montagnes. (fr) |
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| gold:hypernym | dbr:Phenomenon |
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| rdfs:comment | Le blocage d'air froid est un phénomène météorologique qui consiste au blocage et au refroidissement d'une masse d'air au pied d'une chaîne de montagnes. La création d'un blocage d'air froid implique généralement un système de haute pression situé entre le pôle et une chaîne de montagnes. Le système de haute pression amène de l'air froid du nord et l'emprisonne dans une mince couche d'air au pied des montagnes. (fr) Cold air damming, or CAD, is a meteorological phenomenon that involves a high-pressure system (anticyclone) accelerating equatorward east of a north-south oriented mountain range due to the formation of a barrier jet behind a cold front associated with the poleward portion of a split upper level trough. Initially, a high-pressure system moves poleward of a north-south mountain range. Once it sloshes over poleward and eastward of the range, the flow around the high banks up against the mountains, forming a barrier jet which funnels cool air down a stretch of land east of the mountains. The higher the mountain chain, the deeper the cold air mass becomes lodged to its east, and the greater impediment it is within the flow pattern and the more resistant it becomes to intrusions of milder air. (en) |
| rdfs:label | Cold-air damming (en) Blocage d'air froid (fr) |
| rdfs:seeAlso | dbr:Tehuantepecer |
| owl:sameAs | freebase:Cold-air damming yago-res:Cold-air damming wikidata:Cold-air damming dbpedia-fr:Cold-air damming https://global.dbpedia.org/id/2hWPJ |
| prov:wasDerivedFrom | wikipedia-en:Cold-air_damming?oldid=1117639997&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/Santa_ana_winds.jpg wiki-commons:Special:FilePath/SmokeCeilingInLochcarron.jpg wiki-commons:Special:FilePath/Stratus-Opacus-Uniformis.jpg wiki-commons:Special:FilePath/Cold_air_damming_US_location_map.png wiki-commons:Special:FilePath/Cold_air_damming_spectrum,_Appalachian_US.png wiki-commons:Special:FilePath/Surface_stations_for_...r_damming_detection_algorithm,_US.png wiki-commons:Special:FilePath/Tehuan1216001315Z.jpg wiki-commons:Special:FilePath/Cold2dam.png |
| foaf:isPrimaryTopicOf | wikipedia-en:Cold-air_damming |
| is dbo:wikiPageDisambiguates of | dbr:Cad_(disambiguation) |
| is dbo:wikiPageRedirects of | dbr:Cold_air_damming |
| is dbo:wikiPageWikiLink of | dbr:Virginia dbr:Geography_of_Atlanta dbr:Climate_of_New_York_(state) dbr:Tornadoes_of_2017 dbr:Cold_air_damming dbr:North_Carolina dbr:Greensboro,_North_Carolina dbr:Freezing_rain dbr:Cad_(disambiguation) dbr:Siberian_High |
| is rdfs:seeAlso of | dbr:Climate_of_New_York_(state) |
| is foaf:primaryTopic of | wikipedia-en:Cold-air_damming |
