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利用NCEP/NCAR、JRA-55、ERA-Interim再分析资料,对遂宁至广汉航段一次飞机积冰个例的天气系统、环流形势、温度、水汽含量、水汽输送等特征进行分析。结果表明:“3.7”积冰个例是槽前水汽充足导致的,空中存在稳定的逆温层和水汽在近地面辐合为积冰产生提供有利条件。通过本文研究发现,对短途飞行训练中积冰个例进行数值分析时,采用ERA-Interim再分析资料更为合适,且对短途中低空通航飞行训练的积冰预报更为准确。
Based on the NCEP / NCAR, JRA-55 and ERA-Interim reanalysis data, the weather system, circulation situation, temperature, water vapor content, water vapor transport and other characteristics of a single ice accretion from Suining to Guanghan were analyzed. The results show that the “3.7” ice accretion case is caused by the sufficient water vapor in front of the tank, and the existence of stable inversion layer and water vapor in the air are favorable for the ice accretion near the ground surface. Through the research in this paper, it is found that ERA-Interim reanalysis data is more suitable for numerical analysis of ice accretion in short-haul flight training, and the ice accretion prediction is more accurate for short-haul low-altitude flight training.