基于机载探测的内蒙古飞机积冰环境要素与云微物理特征OA

This study used in situ airborne detection data from 39 MA60-aircraft sorties over the central-western region of Inner Mongolia,China,from 2018 to 2022,to analyze temperature,relative humidity,altitude,and cloud microphysical characteristics associated with aircraft icing events.Stratified random sampling was em-ployed to derive the 75th percentile thresholds of various physical parameters under different icing intensities,which were subsequently validated using an independent test set.The results showed that icing predominantly oc-curred under environmental conditions characterized by temperatures ranging from −10℃to 0℃,relative humid-ity exceeding 70%,and altitudes between 4 and 6.5 km.Icing intensity exhibited a negative correlation with tem-perature and a positive correlation with relative humidity.The liquid water content(LWC)varied considerably:75%of the samples had LWC values below 0.25 g·m−3,while the maximum observed value reached 1.8 g·m−3.Notably,LWC did not follow the expected traditional positive correlation with icing intensity.In contrast,the con-centration of small cloud droplets showed a strong positive correlation with icing intensity,with peak values reaching 2000 cm−3 under moderate icing conditions.Furthermore,the effective diameter and degree of dispersion of small droplets tended to increase with icing intensity.For large cloud droplets and precipitation particles,both the concentration and width of the particle size distribution increased significantly with icing intensity.Specifical-ly,the concentration of large cloud droplets was mostly<160 cm−3,while that of precipitation particles was gener-ally<25 cm−3,with particle sizes predominantly ranging from 200 to 4000 μm.The probability of icing across dif-ferent particle size intervals exhibited a multipeak pattern.Based on these analyses,a preliminary set of thresh-olds for cloud microphysical characteristic parameters applicable to the central-western region of Inner Mongolia was proposed.These thresholds are intended to serve as a scientific reference for monitoring and identifying air-craft icing events to ensure aviation flight safety.