摘要
利用Parsivel激光降水粒子谱与地面雨量计对2008年9月9号山西的一次混合降水天气过程进行分析,根据汾阳、介休两站的雨滴谱资料,利用最小二乘法拟合出反射率因子Z与雨强I的关系Zott=159Iott1.5,利用最优化关系法计算出地面雨量计与雷达反射率因子的关系Zrad=200Irain1.2,WSR_88D中默认的关系ZDef=300I1.4,然后分别利用3种Z-I关系对此次降水过程进行估测,计算过程累计雨量,并将估测降水结果与地面雨量计实测结果进行对比。结果表明:利用雨滴谱关系的估测降水效果最好,利用雨量计关系的估测降水结果次之,默认关系计算结果最差;第一者相对第二者提高4%左右,相对第三者则提高近18%左右。
A mixed precipitation weather process by using Parsivel laser raindrops spectrometer system （OTT Parsivel Co., Germany） and a ground rain gauge on 9 September 2008, in Shanxi Province, China, was analysed. With the least squares method, spectrum data of Fenyang and Jiexiu stations were used to determine the first Z--I relationship Z_ott= 159 I_ott^1.5. With optimization Z-I relationships, the data of the ground rain gauge and radar reflectivity is used to calculate the second Z-I relationship Z_rad = 200 I_rain^1.2 the third is the WSR_88D default Z-I relationship Z_Def = 300 1l 4. The pre- cipitation process by using these three types of Z--I relationships was estimated, the accumulated rainfall was calculated, and the results of precipitation were compared with the ground rain gauge measured results. The results show that the precipitation estimation of the rain spectrum Zoo-fort relationship had the best effect; using the rain gauge Z_rad-I_rain rela- tionship to estimate precipitation provided the second-best effect; and the default Z_Def-I relationship calculation showed the worst results. The first method is nearly promoted 4% in contrast with the second method and nearly 18% in contrast with the third method.
出处
《气候与环境研究》
CSCD
北大核心
2012年第6期740-746,共7页
Climatic and Environmental Research
关键词
自动激光雨滴谱仪
估测降水
Automatic laser raindrops spectrometer, Precipitation estimation
