九江市雷暴日数的时空变化特征分析

Spatial and Temporal Variation of the Number of Thunderstorm Days in Jiujiang City

为揭示雷暴发生规律性特征,更好地开展雷电安全防护工作,采用多种数理统计方法,分析了1959-2013年九江市雷暴日数的时空变化特征。结果表明:1)九江市的年雷暴日数,西部山区多于沿江沿湖地区;2)1959-2013年研究地区雷暴日数整体均呈极显著的减少趋势,递减率为0.5 d/a上下;3)该地区年雷暴日数在1980年代中、后期开始出现突变点,在1990年代前期进入了减少的突变状态;4)其年变化的周期性振荡特征不显著。九江市年雷暴日数总体在减少,山区雷暴数多于低海拔地区。

In order to reveal the regularity of thunderstorms and carry out the lightning safety protection work better, a variety of mathematical statistical methods were used to analyze the temporal and spatial variation characteristics of the number of thunderstorm days in Jiujiang city from 1959 to 2013. The results show that: 1) The annual number of thunderstorm days in Jiujiang city is more in the western mountainous areas than in the areas along the river and lake. 2) From 1959 to 2013, the number of thunderstorm days in the study area as a whole showed a very significant reduction trend, with a decline rate of 0.5 d/a or so. 3) The annual number of thunderstorm days in this region began to show the abrupt transition point in the middle and late 1980 s, and entered the reduced abrupt transition state in the early 1990 s. 4) The periodic oscillation characteristics of annual change are not significant. The annual number of thunderstorm days in Jiujiang city is generally decreasing, and the number of thunderstorm days in mountainous area is more than that in low altitude area.