Consistency in Z-R Relationship Variability Regardless Precipitating Systems, Climatic Zones Observed from Two Types of Disdrometer
Consistency in Z-R Relationship Variability Regardless Precipitating Systems, Climatic Zones Observed from Two Types of Disdrometer
复制标题
无论从两种类型的测速仪观测到的降水系统、气候带，Z-R 关系变化的一致性
DOI：
10.4236/acs.2014.45083
复制
发表时间：
2014
影响因子：
0.6
通讯作者：
Modeste Kacou
中科院分区：
文献类型：
--
作者：
B. Bamba;A. D. Ochou;E. Zahiri;Modeste Kacou
利用JW RD-69型雨滴谱仪和OSP型光谱雨量计两种不同气候带的雨滴谱仪在非洲5个站点和南美洲法属圭亚那库鲁试验站点收集的雨滴谱分布资料，研究了地面反射率因子-降雨率（Z-R）关系变率的一致性。结果清楚地证实，关系Z-R知道一个大的空间变异性，从一种类型的降水到另一种降水，并在同一降水，无论用于DSD测量的disdrometer的类型。基于反射率因子-降雨率和体积中值直径与雨滴总数之比-降雨率关系的相似性，揭示了表征雨滴谱的雨滴大小和数量同时隐含的Z-R系数（A，B）的变异性。结果表明，设计用于理解DSD的参数D 0和NT在Z-R关系的可变性中的参与的关系A-α和B-β是相似的，而与所使用的disdrometer的类型无关。然而，萨赫勒地区的A-α关系似乎偏离几内亚、赤道和南部地区的关系。讨论了可能的原因。
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.