福建省古田试验区云系回波特征与人工增雨作业条件分析
投稿时间: 2014-08-05  最后修改时间: 2014-08-05  点此下载全文
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作者单位E-mail
林长城 福建省气象科学研究所 changcheng_lin@163.com 
基金项目:科技部公益性行业科研专项(GYHY201406033)、中国气象局气象关键技术集成与应用(CMAGJ2013M24)和福建省气象局开放式气象科学研究基金(2013K03)
中文摘要:利用2008-2012年4-6月份古田试验区的新一代天气雷达、探空及地面雨量观测等资料,结合天气形势分析,探讨古田试验区云系的回波特征与人工增雨作业条件,结果表明:影响古田试验区的主要天气系统分别为低涡切变、暖区辐合、高空槽和大陆高压;降水云系以积层混合云为主,其次为积状云;天气系统所对应的云系回波类型及降水情况有明显差异,积层混合云的结构配置有利降水;积层混合云大于25dBz的回波面积明显比积状云大,且平均回波顶高和最大回波顶高均比积状云低;积状云的垂直液态水含量明显比积层混合云大;积状云和积层混合云的负温层厚度超2Km;积层混合云的最大回波强度、大于25dBz的回波面积和负温层厚度与区域平均日雨量有着明显的对应关系。古田试验区积层混合云的作业指标为回波强度>25dBz,S>25dBz要大于400Km2,回波顶高大于5.5Km,负温层厚度大于1.5Km,垂直液态水含量大于1 Kg/m2。
中文关键词:福建古田,雷达回波特征,作业条件
 
Analysis On Characteristics of Cloud Echoes and Conditions for Precipitation Enhancement Operations in Gutian of Fujian
Abstract:The cloud echo characteristic and indexes of precipitation enhancement operations in Gutian experiment area are analyzed combining with the weather pattern analysis,based on the new generation weather radar data during April and June in the years 2008-2012,the sounding data,the surface precipitation data and other observation data. The results show that:the chief weather systems that influence the Gutian experiment area include low vortex shear 、warm-sector convergence、upper trough and continental high;the precipitation cloud systems are mainly mixed clouds,the next are cumuliform clouds; there are obvious differences in the cloud echo characteristic and precipitation features in different weather systems and the structure configuration of stratus-cumulus mixed clouds can provide advantages for the rainfall;the strong echo area S>25dBz (S>25dBz means area of which the echo intensity is larger than 25dBz)of stratus-cumulus mixed clouds are obviously larger than that of cumuliform clouds,while the average echo height and the echo top of stratus-cumulus mixed clouds are both lower;the vertical integrated liquid water in cumuliform clouds is much more than that in stratus-cumulus mixed clouds;the depth of negative temperature layer of stratus-cumulus mixed clouds and cumuliform clouds both exceed 2km;the maximum echo intensity、the strong echo area S>25dBz and the depth of negative temperature layer of stratus-cumulus mixed clouds all correspond well to the regional mean daily rainfall. The indexes of stratus-cumulus mixed clouds in Gutian experiment area are: the echo intensity should be larger than 25dBz, S>25dBz should be larger than 400 Km2, the echo should be higher than 5.5 Km, the depth of negative temperature layer should be larger than 1.5Km,the vertical integrated liquid water should be more than 1 Kg/m2.
keywords:Gutian in Fujian Province,Radar echo characteristic,Operation condition
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