关键词: 雨凇, 气候特征, 天气分型, 吉林省

Abstract: Based on the conventionally observed data at 11 weather stations from 1980 to 2007 in Jilin province, the spatial and temporal distributions of 100 glaze cases were analyzed by a statistical analysis method. The results indicate that the glaze weather often appears in the south of Jilin province, especially in hill area and the windward slope of Changbai Mountain and seldom in the north of Jilin province. The glaze weather mainly appears in the early winter and early spring, and the frequency of glaze is reducing. The structure of vertical temperature stratification under glaze weather in Jilin province differs from that in other provinces in  southern China where the melt layer and inversion layer for glaze weather occurred in Jilin province do not exist. By analysis of the ground situation, glaze weather was divided into four main patterns, i.e. the rear of low pressure, the front of high pressure, the south of low pressure and low pressure center. A deep backward-tilting trough at upper level moves over Jilin province, and temperature trough is behind the height trough. Temperature increases firstly and then decreases near ground layer. The relative humidity reaches about 70% at 850 hPa and 80% near the ground, respectively. Strong glaze weather often occurs in the southeastern region of Jilin province and its ground and upper situations are similar to the situations of general glazes, while its relative humidity is 10% more than that of the general glaze both at 850 hPa and near the ground.

Key words: Glaze, Climatic features, Synoptic patterns, Jilin province