雷达定量测量降水  

Radar Rainfall Estimates in Guilin

作　　者：白先达[1] 王艳兰[1] 孙莹[1] 

机构地区：[1]广西桂林市气象局,桂林541001

出　　处：《气象科技》2011年第1期61-65,共5页Meteorological Science and Technology

基　　金：国家自然科学基金项目(40865001)资助

摘　　要：根据桂林新一代天气雷达实际定义混合扫描面,采用降水回波强度分级,用最优化方法统计Z-I关系中的A、b系数,定量测量降水能力得到了明显的提高,比用天气系统分类确立的Z-I关系准确率提高20%,比直接应用美国提供的Z-I关系准确率提高近40%。利用回波强度分级确定降水定量关系操作方便,容易自动变更定量估测降水的关系及实现降水监测业务自动化。The XINRAD S/B radar was put to use after 2004 in Guilin,and some experiments on radar rainfall estimates were carried out.A mixing scanned plane was defined according to the actual situation of Guilin,by means of the graded radar echo intensity and the optimization method,the coefficients of A and b in Z-I relation are obtained.The capability of measuring rainfall quantitatively is improved obviously.The accuracy increased by 20% in use of our Z-I relation,compared with the method of weather system classification;increased by 40% compared with that by the generally used one developed by US.Using the graded radar echo intensity to set up the Z-I relation for radar rainfall estimates is easy to operate,to change the Z-I relation automatically,and to achieve the automation of rainfall estimates.

关 键 词：天气雷达 定量降水测量 Z-I关系 

分 类 号：P457.6[天文地球—大气科学及气象学]