安庆地区一次飞机积冰的气象条件分析  

A Case Study of Aircraft Icing Conditions in Anqing Area

作　　者：孙晶[1] 蔡淼[1] 王飞[1] 史月琴[1] SUN Jing;CAI Miao;WANG Fei;SHI Yueqin(Weather Modification Centre of CMA,Chinese Academy of Meteorological Sciences,Beijing 100081)

机构地区：[1]中国气象科学研究院中国气象局人工影响天气中心

出　　处：《气象》2019年第10期1341-1351,共11页Meteorological Monthly

基　　金：国家重点研发计划(2018YFC1507901、2016YFA0601702);中国气象科学研究院基本科研业务项目(2014R004);公益性行业(气象)科研专项(GYHY20120625)共同资助

摘　　要：利用卫星、雷达、探空、飞机等观测资料和NCEP再分析资料,以及数值模拟结果,对2016年3月8—9日我国安庆地区的云系特征和飞机积冰气象条件进行了分析,并对比了几种积冰指数算法的计算结果。结果表明,此次飞机积冰发生在寒潮天气背景下,强冷空气造成锋面逆温。实测飞机积冰现象出现在对流降雨结束后的层积云层顶部,积冰高度对应高空锋区逆温层底部,云顶高度约为3.4 km,云顶温度为-10℃,无降水和雷达回波,云中主要为过冷水,丰沛时段飞机观测过冷水平均值为0.36 g m^-3,基本无冰相粒子。当云顶高度再度抬升,冰相粒子增多时,过冷水含量减少,不利于积冰现象发生。多种积冰指数对比分析表明,CIP初始积冰潜势算法较好体现了此次层积云飞机积冰特征。CPEFS模式模拟出了与实测比较一致的云宏微观结构。Aircraft icing observation test was conducted in 8-9 March 2016 in Anqing Area of China.The icing conditions for the test are studied in this paper using observations of satellite,radar,soundings,aircraft,NCEP reanalysis data and simulations of the CPEFS model.The multi-scale structure about icing cloud is discussed and the results of several icing indexes are compared.The results show that large-scale weather system of the icing case was the cold wave on the surface.Strong cold air induced frontal temperature inversion.On the top of stratiform cloud after the convective rainfall,icing was detected by the aircraft.The height of the icing was under the layer of the front inversion.The cloud top height was about 3.4 km and the cloud top temperature was-10℃.There was no precipitation and radar reflectivity at this time.The cloud was composed of large number of supercooled water without ice particles.The average supercooled water during the icing time was 0.36 g m^-3.When the cloud top lifted again and ice particles increased to snow,the aircraft icing was not observed because of the poor supercooled water.The CIP initial icing potential results described this aircraft icing well.The cloud structure simulated by CPEFS model was basically consistant with observations.

关 键 词：飞机积冰 过冷水 寒潮 积冰指数 

分 类 号：P426[天文地球—大气科学及气象学] P416