The statistic characteristics of 127 PIREPs (pilot reports)including icing type,cloud classifica-tion,temperature and supercooled liquid water content are investigated based on the CloudSat data.The results indicate that most of the aircraft icing events happened in the environment with temperature above-20℃,only four appeared below -20℃.Clear ice mainly occurs between -5~0℃,rime ice between-20~-10℃,and mixed ice between -15~-5℃.Most aircraft icing happens in the stratocumulus (Sc),altostratus (As),and nimbostratus (Ns).The supercooled liquid water content and its distribution decrease with decreasing temperature.2B-CWC-RO product can identify the supercooled liquid water in the Sc,As and Ns,but it can't identify the supercooled liquid water in cirriform cloud and convective cloud when temperature is below -20℃.%利用CloudSat资料对127次积冰报告的积冰类型、云类、温度和过冷水含量进行统计分析,结果表明:大多数积冰发生在-20℃以上的温度环境中,-20℃以下只发生了4次.明冰主要发生在-5~0℃;毛冰主要发生在-20~-10℃;混合冰主要发生在-15~-5℃.大多数积冰发生在层积云、雨层云和高层云中.过冷水含量随着温度降低而减少,并且过冷水含量的分布范围随着温度降低而变窄.2B-CWC-RO产品垂直剖面上水凝物含量数据能较好地识别出层积云、高层云和雨层云中的过冷水,但未能识别-20℃以下卷状云和对流云的过冷水.
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