中文摘要：

为了揭示西藏雷暴的雷达回波特征，利用雷暴观测资料和新一代多普勒雷达资料，采用统计分析方法对西藏地区2010、2011年6-9月108个雷暴个例进行了研究，结果表明：西藏高原地区雷暴类型多样，时空分布不均匀，雷暴生命史较短，与平原雷暴有明显的区别。西藏雷暴天气雷达回波源地、移动等有一定的规律性。西藏地区雷暴的回波形状多表现为团块状，其次是孤立的对流云回波；日喀则热力雷暴雷达回波强度大部分在40-50dBz，次之是50-70dBz，动力雷暴回波强度主要在40-60dBz，拉萨热力雷暴和动力雷暴回波强度均主要在30-50dBz；日喀则热力雷暴回波顶高平均5．07km，拉萨热力雷暴回波顶高平均4．79km，日喀则和拉萨地区动力雷暴回波顶高主要集中在6-10km；西藏地区热力雷暴和动力雷暴的垂直液态含水量较低，大部分在30kgm^-2以下。

英文摘要：

Studies have been done to reveal the characteristics of the radar echo over Tibet Plateau by statistical analyz- ing 108 thunderstorms using conventional data and Doppler radar data from June to September in 2010 and 2011. Re- sults indicate that： There are kinds of thunderstorms over Tibet plateau, which have asymmetry distribution in spa- tial and temporal and shorter lifetime compared with the thunderstorms over the flatland. There is a certain regularity of source and path of the thunderstorm radar echo over Tibet. Echo of thunderstorms over Tibetan areas shows bulk shape more and then isolated convection; the intensity of most radar echo of thermodynamic thunderstorms is 40 - 50dBz in Xigaze, followed by the level of 50 - 70dBz, and the intensity of the echo of the dynamic thunderstorms mainly remains in 40 - 60dBz; the intensity of thunderstorm echo of thermodynamic and dynamic is mainly in the level of 30- 50dBz over Lhasa. There is an average echo top of 5.07km which thermodynamic thunderstorms could reach over Xigaze, while over Lhasa it is 4.79kin. The height of echo top of dynamic thunderstorms over Xigaze and Lhasa are mainly within 6 - 10km; The vertical liquid water （VIL） level is lower in both type of thunderstorms, mostly less than 30kgm^-2 over Tibet.