摘要
2014年8月19日23时~20日2时黑龙江省嫩江出现单站短时强降水,最大雨强为46mm/h。本文通过对环境特征、雷达回波演变并利用中尺度分析方法分析强降水成因,结果发现：（1）前倾槽结构及850h Pa暖脊发展使得不稳定条件增强;低层西南气流增加了水汽和不稳定能量的输送,地面冷锋是触发条件,特殊地形也是强降水产生的原因。（2）强降水是在列车效应下产生的,强对流出现在地面冷锋前,并沿冷锋发展加强。（3）中尺度分析方法综合利用表征大气稳定性、水汽、动力条件的物理量可以判断强对流的特征。相对湿度、比湿和水汽通量散度的综合应用可以判断对流的性质和强度。
In August 19,2014 23,- 20,2,Nenjiang Province,Heilongjiang Province,province,a single station short-term heavy rainfall,the largest rain intensity is 46 mm / h. Based on environmental characteristics of radar echo,the evolution and the mesoscale analysis method to analyze the causes of strong precipitation. The results showed that：（ 1） forward trough structure and 850 h Pa warm ridge development makes the unstable conditions enhanced; low- level southwest flow increases the water vapor and unstable energy transport,ground cold front is trigger conditions,due to the special terrain,rainfall is also a strong reasons.（ 2） the heavy rainfall is produced in the train under the effect of strong convection,on the ground in front of the cold front,and strengthen the development along the cold front.（ 3） the mesoscale analysis method is used to characterize the atmospheric stability,water vapor,and dynamic conditions of the physical quantities which can be used to determine the characteristics of strong convection. The comprehensive application of relative humidity,humidity and moisture flux divergence can determine the nature and intensity of convection.
出处
《林业勘查设计》
2016年第1期101-104,共4页
Forest Investigation Design
关键词
孤站短时强降水
雷达特征
物理量
short-time strong rainfall
radar signature
physical quantity
