关键词: 表达, 表达

Abstract: 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 resultd 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.