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利用东胜、延安、平凉、西安4站1990年1月—2009年12月每天08时和20时1 000～100hPa标准等压面探空资料,选用国际民航组织建议的WAFS积冰指数Ic作为诊断依据,计算、分析陕西秦岭以北地区逐月飞机积冰率的垂直和水平分布特征,结果表明:该地区具有丰富的积冰试飞气象资源;在垂直高度上,700hPa及以下高度,飞机积冰主要发生在春季和冬季,700hPa高度以上,飞机积冰主要发生在夏半年;飞机积冰多发期间,850hPa及以下高度积冰率水平分布表现为南北少、中部多的特点;850hPa高度以上,飞机积冰率呈现出南部多、北部少的特点。
Using the data of ISSOP at Dongsheng, Yan’an, Pingliang and Xi’an from January 1990 to December 2009 daily at 8:00 and 20:00 1 000 ~ 100 hPa, the WAFS ice accretion index Ic recommended by ICAO was selected as The results show that there are abundant meteorological resources for ice-test flight in this region. At the vertical altitude, the altitude of 700 hPa and below, Ice mainly occurred in the spring and winter, with an altitude of more than 700 hPa. The ice accretion occurred mainly in the summer half of the year. During the frequent ice accretion, the horizontal distribution of ice accretion at 850 hPa and below was characterized by a small number of north and south, Aircraft ice accumulation rate showed more southern and less northern features.