摘要
为消除北京秋冬季节的过冷雾，采用冷云室对资源丰富、价格低廉、使用安全、方便和没有环境污染的液氮进行了成冰性能的鉴定，实验结果表明：液氮成核率与云雾温度的相关不明显，但与液氮的播撒量有关，当云雾的温度在０～－１７．０℃范围，液氮的适宜播撒量可取２６．３ｍｇ／ｍ３，成核率为１０１１ｇ－１。液氮能使过冷雾迅速冰晶化，播撒液氮２ｍｉｎ后，占总量９０％左右的冰晶生成。
In order to disperse supercooled fogs developed in autumn and winter of Beijing, a performance of liquid nitrogen as ice nucleant was evaluated in a cold chamber. Liquid nitrogen which doesn't pollute environment, has a low price and a rich reservoir. The experimental results show that the relation between the performances of liquid nitrogen as ice nucleant and cloud temperatures is not obvious. During a temperature range from 0℃ to 17.0℃ , 10 11 g -1 represents the performance of liquid nitrogen as ice nucleant which is related to seeding amount. 26.3 mg/m 3 is a suitable seeding amount for liquid nitrogen weight. After two minutes of seeding liquid nitrogen, ice crystals about 90% of the total number will produce. The effective time for producing ice crystals may exceed 4￣5 minutes.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1996年第3期372-378,共7页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
北京市人工影响天气办公室资助项目
关键词
液氮
消雾
成冰核
播撒量
成冰性能
liquid nitrogen
to disperse fogs
ice nucleant
seeding amount
