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Consistency in <i>Z</i>-<i>R</i>Relationship Variability Regardless Precipitating Systems, Climatic Zones Observed from Two Types of Disdrometer

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Atmospheric and Climate Sciences 2014年第5期4卷 941-955页

作者： Bakary Bamba Abé Delfin Ochou Eric-Pascal Zahiri Modeste Kacou Laboratory of Atmospheric Physics and Fluid Mechanics University Félix Houphouet-Boigny Abidjan Cote d’Ivoire Geosciences Environment Toulouse (GET) University Paul Sabatier of Toulouse III Toulouse France

Data from rain Drop Size Distributions gathered on five sites in Africa as well as those of the pilot site in Kourou (French Guyana, South America), located in different climatic zones, and collected by two types of disdrometer (the impact JW RD-69 disdrometer and the Optical spectro-pluviometer, OSP) are used to study the consistency of the reflectivity factor-rain rate at the ground (Z-R) relationship variability. The results clearly confirm that the relationship Z-R knows a large spatial variability, from a type of precipitation to another and within the same precipitation regardless the type of disdrometer used for DSD measurements. Base on the similarity of the relations reflectivity factor-rain rate and ratio median volume diameter over the total number of drops-rain rate, the variability of the Z-R coefficients (A, b) through the simultaneously implication of the size and number of drops which characterize the DSD was exhibited. It was shown that the relationships A-α and b-β designed to understand the involvement of parameters D0 and NT of DSD in the variability of the relationship Z-R are similar regardless the types of disdrometer used. However, the relations A-α in the Sahelian region appear to deviate from those of Guinean, equatorial and Soudanian zones. The plausible reasons were discussed.

关键词： Drop Size Distributions Consistency in Z-R Relationship Variability Squall Lines Thunderstorm Stratiform Rain JW RD-69 Disdrometer Optical spectro-pluviometer OSP

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