Abstract: The improved 5 L mixing cloud chamber (BIGG cloud chamber) was used to measure the atmospheric ice nuclei (IN) at Gutian station and Shitashan station from May to June in 2017, for analyzing the characteristics of IN in Gutian artificial precipitation enhancement experimental area of Fujian Province. The distributions, differences and sources of IN at different altitudes were analyzed in this paper, even about the correlation between IN characteristics and meteorological conditions. The results are shown as follows: (1) The concentration of IN was obviously affected by rain erosion when rainfall intensity was higher than 5 mm·h-1. (2) At diffetent activation temperatures, the mean values of IN concentration measured at afternoon were mainly larger than those measured at morning both in these two stations. (3) At Gutian station, the variation of IN concentration had positive correlation with air temperature and negative correlation with air pressure, but the others had not been associated with it. (4) The concentration of IN transported from southwest was higher than that from the east orientation of Taiwan Strait, and from the same source it was slightly higher at low altitude than that at high altitude. (5) Compared with other observations in China, the concentration of IN in Gutian area was higher when the activation temperature was between -20 and -10 ℃ and it was lower when the activation temperature was between -30 and -25 ℃. (6) At -10 ℃, concentration of IN was extremely low. Therefore, it was reasonable using cold cloud seeding in Gutian area for artificial precipitation enhancement.

Key words: atmospheric ice nuclei, BIGG cloud chamber, artificial precipitation, HYSPLIT

摘要： 为了解福建省古田人工增雨试验区大气冰核特征，2017年5—6月利用5 L便携式混合云室在古田站、石塔山站开展大气冰核观测，对大气冰核在不同海拔的分布特征、差异、来源及其与气象条件的相关性进行分析。结果表明：（1）当降水强度>5 mm·h-1时大气冰核受雨水冲刷影响明显；（2）不同活化温度下，各站下午观测的大气冰核浓度基本上大于上午；（3）古田站大气冰核浓度与温度正相关，与气压负相关，其余相关性不大；（4）西南来源的大气冰核浓度高于东面台湾海峡来源，相同来源下低海拔大气冰核浓度略高于高海拔；（5）相比我国其他城市，古田试验区测到的大气冰核浓度在活化温度为-20～-10 ℃时偏高，-30～-25 ℃时偏低；（6）当活化温度为-10 ℃时冰核浓度极低，古田试验区宜开展冷云催化人工增雨试验。

关键词: 大气冰核, BIGG云室, 人工增雨, HYSPLIT