液氮消雾成冰性能的实验研究

北京大学学报（自然科学版）

液氮消雾成冰性能的实验研究

张铮¹, 任婕², 韩光²

¹北京大学地球物理系，北京，100871; ²北京市人工影响天气办公室，北京，100081

收稿日期:1995-05-12 出版日期:1996-05-20 发布日期:1996-05-20

An Experimental Investigation on Liquid Nitrogen as Ice Nucleant for Artificial Dispersal of Supercooled Fogs

ZHANG Zheng¹, REN Jie², HAN Guang²

¹Department of Geophysics, Peking University, Beijing, 100871; ²Beijing Municipal Weather Modification Office, Beijing, 100081

Received:1995-05-12 Online:1996-05-20 Published:1996-05-20

摘要/Abstract

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，冰晶生成的有效时间可延续到4min或5min以后。

关键词: 液氮, 消雾, 成冰核, 播撒量

Abstract: 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℃, 10¹¹g^-1 represents the performance of liquid nitrogen as ice nucleant which is related to seeding amount. 26.3mg/m³ 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.

Key words: liquid nitrogen, to disperse fogs, ice nucleant, seeding amount

中图分类号:

张铮, 任婕, 韩光 . 液氮消雾成冰性能的实验研究[J]. 北京大学学报（自然科学版）.

ZHANG Zheng,REN Jie,HAN Guang. An Experimental Investigation on Liquid Nitrogen as Ice Nucleant for Artificial Dispersal of Supercooled Fogs[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

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https://xbna.pku.edu.cn/CN/Y1996/V32/I3/372