The AgI Seeding Cloud Impact Investigation (ASCII) campaign 2012: overview and preliminary results
The AgI Seeding Cloud Impact Investigation (ASCII) campaign 2012: overview and preliminary results
复制标题
DOI：
10.54782/jwm.v45i1.121
复制
发表时间：
2013-03
期刊：
影响因子：
--
通讯作者：
B. Geerts;B. Pokharel;K. Friedrich;D. Breed;R. Rasmussen;Yang Yang-Yang;Q. Miao;S. Haimov;B. Boe;E. Kalina
中科院分区：
文献类型：
--
作者：
B. Geerts;B. Pokharel;K. Friedrich;D. Breed;R. Rasmussen;Yang Yang-Yang;Q. Miao;S. Haimov;B. Boe;E. Kalina
ASCII活动于2012年初在怀俄明州的Sierra Madre（大陆分水岭）上进行，以检查从地面向浅地形云中注入银（AgI）所导致的云微物理变化。这次活动包括在山口安装一台双偏振多普勒车载雷达，怀俄明州大学的空中国王飞机，配备有毫米波剖面雷达和偏振后向散射激光雷达，两台Ka波段剖面雷达，一台在碘化银发生器的上游，一台在碘化银发生器的下游，以及地面上用于确定云液态水含量和现场雪粒子特征的一些仪器。实验设计支持同时（上游/下游）和非同时（之前/期间）的比较，以梳理出的云和降水的冰川播种的影响。不幸的是，合适的冷云底温度在战役期间很少出现。然而，在一个没有播种期，然后播种期，以及同时基于地面的廓线雷达数据的飞行上收集的廓线雷达数据表明，在适当的条件下，碘化银播种可以显着增加雷达反射率在边界层，从而在地面附近的降雪率。
The ASCII campaign was conducted in early 2012 over the Sierra Madre, a Continental Divide range in Wyoming, to examine cloud microphysical changes resulting from the ground-based injection of silver iodide (AgI) into shallow orographic clouds. The campaign included a dual-polarization Doppler-On-Wheels radar on the mountain pass, the University of Wyoming King Air aircraft with profiling mm-wave radar and polarization backscatter lidar, two Ka-band profiling radars, one upstream of the AgI generators, and one downstream, and a number of instruments on the ground to characterize the cloud liquid water content and the in situ snow particle characteristics. The experimental design supported both simultaneous (upstream/ downstream) and non-simultaneous (before/ during) comparisons, in order to tease out the impact of glaciogenic seeding on cloud and precipitation. Unfortunately, suitably cold cloud base temperatures rarely occurred during the campaign. Nevertheless, profiling radar data collected on flights with a no-seeding period followed by a seeding period, as well as simultaneous ground-based profiling radar data, indicate that under suitable conditions AgI seeding can significantly increase radar reflectivity in the boundary layer, and thus snowfall rate near the ground.