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- W1975905624 abstract "Airborne microphysical measurements and ground-based radar-reflectivity observations, collected at the near of a narrow cold frontal rainband during the FRONTS 87 experiment, are used to infer some characteristics of the precipitation: size-distribution, liquid or ice-water content, mass-weighted fallspeed, radar-reflectivity and relationships between pairs of these quantities. In the ice phase region, two different methods are proposed to calculate the radar reflectivity from the aircraft data. The influence of the choice of the ice particle type on the calculated quantities is discussed from the results of the first method. The second method is new: it is based upon the use of a roughness parameter estimated from the analysis of the two-dimensional particle images of ice precipitation. Although this method is tentative, it gives conclusive results for the two different flight levels studied here. Lors de l'expérience FRONTS 87, des mesures microphysiques aéroportées et des observations de réflectivité fournies par un radar basé au sol ont été collectées à l'arrière d'une bande étroite de front froid. Ces mesures sont utilisées pour déduire différentes caractéristiques des particules précipitantes: distribution dimensionnelle, contenu en glace ou en eau liquide, vitesse de chute pondérée par la masse, reflectivité radar et relations entre ces différentes quantités. Dans la zone où ont été échantillonnées des précipitations en phase glace, deux méthodes sont proposées pour calculer la réflectivité radar à partir des données aéroportées. L'influence du type de cristaux de glace choisi sur les quantités calculées est discutée à partir des résultats de la première méthode. La seconde méthode est nouvelle: elle est basée sur l'utilisation d'un paramètre de rugosité estimé à partir de l'analyse des images bidimensionnelles des particules précipitantes en phase glace. Cette méthode fournit des résultats concluants pour les données des deux niveaux d'altitude considérés ici." @default.
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- W1975905624 date "1993-05-01" @default.
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- W1975905624 title "Airborne microphysical measurements and radar reflectivity observations near a cold frontal rainband observed during the FRONTS 87 experiment" @default.
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- W1975905624 doi "https://doi.org/10.1016/0169-8095(93)90003-7" @default.
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