海南儋州雷暴天气气候特征分析

Climatic and Synoptic Characteristics of Thunderstorm in Danzhou of Hainan Province

利用1971—2000年儋州30年逐日雷暴观测资料,对海南儋州地区雷暴时间分布特点和变化规律进行分析研究,总结了儋州雷电活动的气候特征。结果表明:儋州年平均雷暴日数达111天,高发季节为每年5—8月,高发时段为午后13—17时,年雷暴日数年代际线性变化呈下降趋势,但二阶滑动平均变化趋势为先减后增。对1991—2000年雷暴产生的天气影响系统统计表明:儋州雷暴主要产生于冷空气、变暖的高压脊、热带气旋、副热带高压、热带低值系统5类天气系统中,有明显的季节特征。

Using the data of the thunderstorm days of Danzhou stations in Hainan province from 1971 to 2000, the basic climatic characteristics of thunderstorm in Danzhou are analyzed. It is shown that the annual averaged days of thunderstorm in Danzhou are 111. Thunderstorm occurs frequently from May to August, most frequently from 13 - 17 in the afternoon . The general trend of the annual thunderstorm in Danzhou has been reducing in the last 30 years. Based on the thunderstorm data from 1991 to 2000, the related circulation patterns and synoptic systems are also studied, The synoptic patterns of thunderstorm can be divided into five types, which are affected by the cold air, indifferent cold high, the subtropical high, the tropical cyclone or related to tropical low systems respectively. The proportion of each type varies in different seasons.