人为引发的下沉气流可以抑制对流云的发展，这一现象已在试验中得到验证。用“人工下沉气流法”实施人工消云试验时，需在云顶大剂量的播撒粉剂催化剂。北京市人工影响天气办公室研制了能完成此类大剂量播撤任务的设备，并通过外场飞行试验对设备进行检验和改进。这是国内人工影响天气领域首个采用空投播撒法的粉剂催化剂播撤设备；可减少催化剂对飞机和播撤设备的污染。分析发现，新设备能够满足人工消云作业中播撒大剂量粉剂催化剂的需要。该设备在北京奥运会、残奥会开闭幕式当日的消云试验作业中投入使用，共实施消云飞行作业9架次，累计利用新设备播撒吸湿性粉剂催化剂34吨。%The methods to destroy developing convective clouds, using artificially generated downdrafts, were theoretically justified and thoroughly tested under laboratory and field conditions. It is based on arti- ficial initiation of downdrafts in convective clouds by releasing large doses of powdered agents into their tops. Beijing Weather Modification Office developed a new seeding device to release large doses of pow- dered agents in field experiments. This is the first device that seeds powdered agents by airdropping in the weather modification field experiments of China. Pollution to the aircraft could be relieved when releasing powdered agents with the device. The powdered agents should be packaged with special box before air- drop. The new device was used at Beijing Olympic Games and Paralympic Games opening and closing days. The total 34 tons of hygroscopic powdered agents were released in 9 flights.
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