摘要
用随机函数的方法，并假定雨滴谱为Ｇａｍｍ分布，模拟并讨论了雨滴谱变化及雨区裹减对普通雷达和双线偏振雷达测雨误差的影响。结果在明：双线偏振雷达测雨精度受雨区衰减及滴谱变化的影响均小于普通雷达。雨区衰减使双线偏振雷达测雨产生小雨高估、大雨影响不大的现象，其主要原因可能是差反射率因子Ｚ＿ＤＲ的测量误差。
Under the assumption that the raindrop size has a Gamma distribution,randomfunction is employed to model and investigate the effects of the variation in the size distribu-tion and rainfall attenuation on the precipitatlon error measured by a common radar and bi-line polarization radar. Results show that the effects of the latter are smaller as opposed tothe former,and the rainfall attenuation causes the polarization measurement to be overesti-mated for light rain and to show no big influence for heavy rainfall.
出处
《南京气象学院学报》
CSCD
1994年第2期255-258,共4页
Journal of Nanjing Institute of Meteorology
关键词
测雨精度
雨区衰减
雨滴谱
雷达
bi-line polarization radar, random function. raindrop size distribution,numericalsimulation
