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資料對(duì)127次積冰報(bào)告的積冰類型、云類、溫度和過冷水含量進(jìn)行統(tǒng)計(jì)分析,結(jié)果表明:大多數(shù)積冰發(fā)生在-20℃以上的溫度環(huán)境中,-20℃以下只發(fā)生了4次.明冰主要發(fā)生在-5~0℃;毛冰主要發(fā)生在-20~-10℃;混合冰主要發(fā)生在-15~-5℃.大多數(shù)積冰發(fā)生在層積云、雨層云和高層云中.過冷水含量隨著溫度降低而減少,并且過冷水含量的分布范圍隨著溫度降低而變窄.2B-CWC-RO產(chǎn)品垂直剖面上水凝物含量數(shù)據(jù)能較好地識(shí)別出層積云、高層云和雨層云中的過冷水,但未能識(shí)別-20℃以下卷狀云和對(duì)流云的過冷水.
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