A Case Study of Aircraft Icing Conditions in Anqing Area
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.