Formation et développement des talwegs tropicaux-tempérés en Afrique australe.

6533b858fe1ef96bd12b6b09

RESEARCH PRODUCT

Formation et développement des talwegs tropicaux-tempérés en Afrique australe.

Clémence Macron Benjamin Pohl Yves Richard

subject

[SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology perturbation des moyennes latitudes classification [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Afrique australe talweg tropical tempéré [ SDU.STU.CL ] Sciences of the Universe [physics]/Earth Sciences/Climatology

description

6 pages; International audience; Les talwegs tropicaux-tempérés (TTT) sont des systèmes pluviogènes situés d’Afrique australe et faisant intervenirà la fois la convection tropicale et la dynamique des moyennes latitudes. Ils sont responsables en moyenne de 20% des pluiessaisonnières sud-africaines et durent typiquement entre 3 et 5 jours. Leurs mécanismes de formation sont encorepartiellement inconnus. Une classification en k-means est utilisée ici pour identifier la composante convective des TTT d’unepart, et les perturbations des moyennes latitudes, d’autre part. Les résultats indiquent que les perturbations tempérées sontune condition nécessaire au développement des TTT, mais non suffisante. Un excès d'énergie statique humide sur le canal duMozambique, et de fortes advections d'humidité depuis les océans Atlantique et Indien, forment des conditionssupplémentaires favorables à la convection atmosphérique profonde à proximité du continent.

year	journal	country	edition	language
2013-09-03

https://hal.archives-ouvertes.fr/hal-01116991

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