【摘要】 利用塔克拉玛干沙漠大气环境观测试验站2010年6~8月风廓线雷达探测资料,在前期研究基础上,进一步分析了沙尘天气的雷达回波强度以及沙漠夏季晴空湍流发展演变特征。研究表明:1在具有一定湍流脉动和大气湿度的前提下,风廓线雷达可以在沙尘天气进行有效探测,浮尘、扬沙、沙尘暴天气现象在雷达回波强度时间—高度图上有清晰的印记和表现,浮尘、扬沙、沙尘暴发生时间段与回波强度大值区对应一致,从回波强度图上可以大致识别沙尘输送高度,沙尘天气的雷达等效回波强度约在-18~10dBZe范围变化;2塔克拉玛干沙漠夏季典型晴空湍流旺盛区域发展高度可达到3 500~4 000m,湍流平均以0.13~0.16m/s的上升速度向高空发展,下午15:00以后,湍流强度最大区域不在近地边界层,而在大气边界层顶附近;C2n时间—高度变化在一定程度上反映了大气边界层的演变特征,沙漠夏季晴天边界层高度有可能达到3 500~4 000m。更多还原

【Abstract】 The Urumqi Institute of Desert Meteorology of China Meteorological Administration(CMA)carried out an atmospheric scientific experiment on the detection of dust weather and Clear-air Turbulence using a wind-profiling radar in the hinterland of the Taklimakan Desert in June-August 2010.Based on the wind-profiling data obtained from this experiment,this paper analyzes the characteristics of vertical intensity distribution of dust weather and desert summer clear air turbulence evolutionary characteristics.Studies show that:1 Under the premise of a certain turbulence and atmospheric humidity,A wind-profiling radar can effectively detect dust weather,the echo intensity of dust weather in Taklimakan is about-18~10dBZe,indicates that the dust echo intensity is significantly weaker than that of precipitation.2 The clear air turbulence development in Taklimakan Desert can reach 3 500~4 000 maltitude in summer,the turbulence is about 0.13 to 0.16m/s lift velocity to upper air,Taklimakan Desert summer boundary layer height can reach about 3 500~4 000 m.更多还原