临汾市冰雹气候特征分析

Analysis on the Climatic Characteristics of Hail in Linfen City

为了进一步了解临汾市冰雹的气候特征，从而提出相应的防雹减灾对策与方法，以减少冰雹灾害带来的损失，利用临汾地区17个自动站的冰雹资料，采用趋势分析，Mann-Kendall法和Morlet小波分析等方法，对临汾市近43年来冰雹气候特征进行了分析研究。结果表明：临汾市以西部山区为冰雹多发区，年冰雹发生次数呈显著下降趋势，气候倾向率为．1．18次／10a，2007年为显著下降的突变点。同时，临汾市年冰雹发生次数存在着5年、17年和22年的周期，以17年为主周期，每年的5—9月为冰雹多发期，其中7月出现最大值，而每天又以12时-20时为冰雹的多发时段，冰雹持续时间一般较短，多为1-5min。

In order to further understand the climatic characteristics of hail of Linfen, put forward some disaster reduction countermeasures and reduce the hail disaster losses, the climatic characteristics of hail in Linfen in recent 43 years was analyzed with trend analysis, Mann-Kendall test method and Morlet wavelets analysis method based on the hail data of the 17 meteorological stations in Linfen. The resuhd indicated that： the western mountains were the prone area in Linfen and the hail occurrence times were significantly decline each year, the climate trend rate were -1.18 times/10 a, 2007 was the mutational site of significant reduction. There were 5, 17 and 22 years periods of oscillation in the hail days at the same time and 17 years was the primary period. The hail prone periods were May to September each year and July was the most frequent. And the hail occurred mostly during 12 to 20 o＇ clock. Hail generally had a shorter duration of 1-5 min.