2014年3月12日利用机载粒子探头(DMT)对我国宜昌及周边地区的非降水云系进行了探测时发现了少量的飞机积冰,本文分析了积冰云层中云微物理量的分布特征.垂直平均分布表明,CAS、CIP和PIP粒子数浓度分别大于300个·cm-3、1个·cm-3和10-5个·cm-3,粒子中值直径最大值分别为3μm、89 μm和1389 μm.谱分布表明,3650m高度重力碰并和凇附过程使得CIP和PIP粒子谱较宽,3650 m以下谱宽较窄,粒子以凝结增长为主,大粒子和冰晶粒子主要是由高层下落造成.平飞观测统计表明,3350 m的CAS和CIP粒子平均数浓度均大于3650 m的值,但PIP粒子数浓度、粒子平均和最大中值直径则相反.平飞时间变化表明,3350m高度CAS粒子数浓度和直径大致呈反相关,3650m大云滴和冰雪晶粒子的数浓度和中值直径随时间波动较大.%By using the probe of DMT (Droplet Measurement Technologies),the aircraft icing in nonprecipitation clouds on 12 April in 2014 over Yichang and its surrounding areas were probed.The vertical distributions show that the number concentrations of CAS (Cloud Aerosol Spectrometer),CIP (Cloud Imaging Probe) and PIP (Precipitation Imaging Probe) are greater than 300 cm 3,1 cm-3 and 10-5 cm-3,respectively.The maximum median diameters are 3 μm,89 μm and 1389 μm,respectively.The spectral distribution shows that the gravitational collision and riming processes result in forming a wider spectra at 3650 m,while relatively narrow below 3650 m,where particles grow mainly depend on condensation process,big cloud particles and ice crystals are dropping from upper levels.The horizontal probe shows that the number concentrations of CAS and CIP at 3350 m are greater than those at 3650 m,while the number concentration of PIP,the median diameter and the maximum median diameter are opposite.The time series of horizontal probe show that the number concentration and the median diameter at 3350 m have an inverse relationship,and the number concentration and the median diameter of big cloud particles and ice crystals are fluctuant.
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