激光与光电子学进展, 2012, 49 (12): 120103, 网络出版: 2012-11-26
利用激光降水粒子谱仪观测北京夏季雨滴谱特征
Summer Drop Size Distribution Characteristics in Beijing from Laser-Based Optical Disdrometer
大气光学 雨滴谱 降水强度 雷达反射率因子 质量加权平均直径 atmospheric optics drop size distribution rainfall rate radar reflectivity factor mass-weighted mean diameter
摘要
雨滴谱(DSD)反映了云及降水物理学特性,是推导降水强度、雷达反射率因子等物理参量的基本要素，取决于水凝物由冰晶或云水转化为地面降水这一复杂微物理过程。为更好地了解北京地区夏季降水雨滴谱特征，利用Parsivel激光降水粒子谱仪于2007年7月至8月间在北京市观象台进行观测，得出不同降水类型的雨滴谱分布以及雨滴质量加权平均直径、最大直径和降水强度等微物理参量，对观测数据进行拟合确定不同降水类型M-P谱分布函数参数值。结果表明北京夏季降水过程中直径在0.2~1.5 mm之间的小雨滴对雨滴数密度贡献均大于直径超过2.0 mm的大雨滴，对流云降水的雨滴谱比层云的更宽，大雨滴所占比例更大。并在此基础上计算得出不同降水类型雷达反射率因子与降水强度的关系参数。
Abstract
Drop size distribution (DSD) observed at the ground depends on complex microphysical processes that progressively transform ice or water clouds particles aloft into rain below. DSD reflects the physics of rain and is the fundamental property for radar rainfall remote sensing, because it rules the relationship between the radar reflectivity factor Z and rainfall rate R. To better understand the microphysics of the summer precipitation, DSD measurements collected with Parsivel disdrometer are carried out at Beijing Weather Observatory in July to August 2007. The DSD characteristics and the relations among the radar reflectivity factor Z, rainfall rate R and mass-weighted mean diameter Dm are investigated. Specific Z-R relationship is derived for the whole data set.
徐文静, 苏德斌, 伽丽丽, 于丽萍, 许仕清, 李栋. 利用激光降水粒子谱仪观测北京夏季雨滴谱特征[J]. 激光与光电子学进展, 2012, 49(12): 120103. Xu Wenjing, Su Debin, Qie Lili, Yu Liping, Xu Shiqing, Li Dong. Summer Drop Size Distribution Characteristics in Beijing from Laser-Based Optical Disdrometer[J]. Laser & Optoelectronics Progress, 2012, 49(12): 120103.
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