本溪地区近56a雷暴气候特征分析

摘要

Benxi locates in the Liaodong Peninsula in southeastern mountainous territory of several overlapping peaks,mountains and more small,low mountains,hills,at the northeast end offshoot of Changbai Mountain,it be⁃longs to temperate monsoon climate,four seasons,abundant sunshine and rainfall.In this paper,the variation charac⁃teristics of thunderstorm days in Benxi area in recent 56 years were analyzed by using the meteorological data from 4 ground stations in Benxi in 1958-2013.The results showed that the average number of thunderstorm days in Benxi ar⁃ea was 30.4 days,and the trend decreased by 0.87d/10a,with the maximum number of thunderstorm days in June and July.Average initial thunder date was April 24th,the average final thunder date was October 22nd,the average thunderstorm duration was 182.3 days.%本溪地处辽东半岛东南部山区，境内层峦叠嶂、山多地少，以低山、丘陵为主，处于长白山支脉东北端，属于中温带季风气候，四季分明，光照充足，雨量充沛。该文采用1958-2013年本溪市4个地面观测站的雷暴气象资料，分析了本溪地区近56a来的雷暴日数变化特征。结果表明：本溪地区近56a平均雷暴日数为30.4d，并以0.87d/10a的趋势减少，其中6月和7月雷暴日数最多。平均初雷日期为4月24日，平均终雷日期为10月22日，平均雷暴持续期为182.3d。