The African easterly jet, is a region of the lower troposphere over West Africa where the seasonal mean wind speed is maximum and easterly. Forming due to the temperature contrast between the Sahara Desert and the Gulf of Guinea, maximum wind speeds are located at a height of 3 kilometres (1.9 mi) to the north of the monsoon trough. The jet marches northward from its southern location in January, reaching its most northerly latitude in August, and its strongest winds in September while shifting back towards the equator. Within the easterly jet, tropical waves form. Convective complexes associated with these waves can form tropical cyclones. If the feature is suppressed south of its normal location during August and September, tropical cyclogenesis is suppressed. If desertification continue

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  • Le courant-jet africain d'Est est une zone de vent fort continu aux altitudes 600, 700 hectopascals (environ 4 kilomètres) Il se situe à environ 7,8° de latitude Nord, et est orienté d'est en ouest. Il a pour origine un fort gradient de température et d'humidité. En été, le golfe de Guinée, victime des remontées de l'hiver Austral reste assez frais, alors que l'Afrique nord tropicale, et les côtes de Guinée, jusqu'au Sahel connaît sa mousson et prend donc des caractéristiques chaudes et humides, et que le Sahara reste chaud, mais extrêmement sec. Il se crée alors un courant-jet orienté est-ouest. Le courant jet est impliqué, par son instabilité, dans la formation des ondes tropicales de mai à octobre. Un lien avec l’oscillation atlantique multidécennale est probable. Lorsque l'Atlantique nord se rafraîchit au profit de l'Atlantique sud, la mousson en Afrique nord tropicale s'affaiblit, provoquant des sécheresses périodiques jusqu'au Sahel. Le courant jet est alors affaibli. (fr)
  • The African easterly jet, is a region of the lower troposphere over West Africa where the seasonal mean wind speed is maximum and easterly. Forming due to the temperature contrast between the Sahara Desert and the Gulf of Guinea, maximum wind speeds are located at a height of 3 kilometres (1.9 mi) to the north of the monsoon trough. The jet marches northward from its southern location in January, reaching its most northerly latitude in August, and its strongest winds in September while shifting back towards the equator. Within the easterly jet, tropical waves form. Convective complexes associated with these waves can form tropical cyclones. If the feature is suppressed south of its normal location during August and September, tropical cyclogenesis is suppressed. If desertification continues across Sub-Saharan Africa, the strength of this feature would increase, though tropical wave generation is expected to decrease which could decrease the number of tropical cyclones in the Atlantic basin. (en)
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http://purl.org/linguistics/gold/hypernym
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  • The African easterly jet, is a region of the lower troposphere over West Africa where the seasonal mean wind speed is maximum and easterly. Forming due to the temperature contrast between the Sahara Desert and the Gulf of Guinea, maximum wind speeds are located at a height of 3 kilometres (1.9 mi) to the north of the monsoon trough. The jet marches northward from its southern location in January, reaching its most northerly latitude in August, and its strongest winds in September while shifting back towards the equator. Within the easterly jet, tropical waves form. Convective complexes associated with these waves can form tropical cyclones. If the feature is suppressed south of its normal location during August and September, tropical cyclogenesis is suppressed. If desertification continue (en)
  • Le courant-jet africain d'Est est une zone de vent fort continu aux altitudes 600, 700 hectopascals (environ 4 kilomètres) Il se situe à environ 7,8° de latitude Nord, et est orienté d'est en ouest. Il a pour origine un fort gradient de température et d'humidité. En été, le golfe de Guinée, victime des remontées de l'hiver Austral reste assez frais, alors que l'Afrique nord tropicale, et les côtes de Guinée, jusqu'au Sahel connaît sa mousson et prend donc des caractéristiques chaudes et humides, et que le Sahara reste chaud, mais extrêmement sec. Il se crée alors un courant-jet orienté est-ouest. (fr)
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  • African easterly jet (en)
  • Courant-jet africain d'Est (fr)
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