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Diurnal cycle of the intertropical discontinuity over West Africa analysed by remote sensing and mesoscale modelling / Bernhard Pospichal in Quarterly Journal of the Royal Meteorological Society, vol 136 n° S1 (January 2010)
[article]
Titre : Diurnal cycle of the intertropical discontinuity over West Africa analysed by remote sensing and mesoscale modelling Type de document : Article/Communication Auteurs : Bernhard Pospichal, Auteur ; Diana Bou Karam, Auteur ; Susanne Crewell, Auteur ; Cyrille Flamant, Auteur ; Anja Hünerbein, Auteur ; Olivier Bock , Auteur ; Frédérique Saïd, Auteur Année de publication : 2010 Projets : AMMA & AMMA-2 / Janicot, Serge Article en page(s) : pp 92 - 106 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Afrique occidentale
[Termes IGN] Bénin
[Termes IGN] données météorologiques
[Termes IGN] humidité de l'air
[Termes IGN] image Météosat
[Termes IGN] meso échelle
[Termes IGN] mousson
[Termes IGN] température au solRésumé : (auteur) The diurnal cycle of the Intertropical discontinuity (ITD), i.e. the interface at the ground between moist monsoon air and dry Harmattan air, is an important factor in the West African monsoon system. During the whole of 2006, high‐resolution ground‐based remote‐sensing measurements were performed in the area of Djougou, Benin, which made it possible to observe the ITD and the associated sharp gradient of temperature and humidity in detail. In order to extend the point measurements to a three‐dimensional view of the ITD and to enhance the knowledge of the related processes, the mesoscale atmospheric model Meso‐NH was run for a case study (84 h period) in April 2006. In addition Meteosat infrared observations were used to determine the ITD position and its movement. From these observations a northward propagation of the moist air front (ITD) of 8–12 m s−1 was calculated. The propagation speed of the front evaluated from the satellite observations was replicated by the model and the time of the front arrival over Djougou was simulated with a maximum error of 1 hour. With respect to the ground‐based observations, the model was able to reproduce the dynamics and thermodynamics of the front as well as the diurnal cycle of the planetary boundary layer over the study area. This agreement suggests the use of the model to further describe processes in the lower atmosphere at high resolution. Numéro de notice : A2010-643 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1002/qj.435 Date de publication en ligne : 11/03/2010 En ligne : https://doi.org/10.1002/qj.435 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90735
in Quarterly Journal of the Royal Meteorological Society > vol 136 n° S1 (January 2010) . - pp 92 - 106[article]Documents numériques
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