松桃县57年雷暴气候特征分析

Thunderstorm Characteristics of Songtao County during 1957—2013

利用1957—2013年松桃国家基本气象站的雷暴观测数据,分析松桃县近57年的雷暴气候变化特征。结果表明,松桃县年平均雷暴日数为51.4 d,平均雷暴随时间变化呈现出波动减少的趋势;根据雷暴的季节变化划分可得,秋季和冬季年平均雷暴趋于增多趋势,春季和夏季趋于减少趋势。松桃县雷暴主要出现在3—9月,多年月平均雷暴日呈现出双峰型,峰值主要出现在4和7月。松桃县雷暴的初日和终日出现时间年际变化较大,97%保证率的雷暴初日出现在3月下旬,84%保证率的雷暴终日出现在12月上旬。

Using thunderstorm data from Songtao National Basic Meteorolog- ical Station from 1957 to 2013, thunder- storm characteristics of the local area in the past 57 years were analyzed. The re- sults showed that mean annual thunder- storm days of Songtao County were 51.4 d, the mean thunderstorm days fluctuat- ed but declined gradually. In view of the seasonal occurrence, mean thunderstorm days in autumn and winter showed a tendency of increase, but decline in spring and summer. Thunderstorm in Songtao County mainly occurred from March to September, and multi-year mean thunderstorm days showed a bi- modal pattern, and the peak value ap- peared mainly in April and July. First thunderstorm date and final thunderstorm date in the local area varied greatly year from year, first thunderstorm date with 97 percent guarantee occurred in the late March, and the final thunderstorm date with 84 percent guarantee in the early December.