山东省龙卷风发生的气候特征

Features of Tornadoes Distribution in Shandong Province

根据藤田 -皮尔森强度分类法对 1 95 0年～ 2 0 0 0年山东省出现的 35 1次龙卷风进行分类 ,其中F0级 61次 ,F1级 2 5 6次 ,F2级 34次。山东半岛、鲁中、鲁南出现次数较多 ,鲁西北较少。 1 95 0～ 1 972年发生次数明显高于 1 973～ 2 0 0 0年。龙卷风发生存在明显的季节变化 ,夏季发生较多。龙卷风主要发生于午后至傍晚 ,多数龙卷风仅能维持几分到十几分钟。

Abstract:Based on investigating of tornadoes in Shandong province, there are 351 tornadoes with f0 -scale 61 , f1 -scale 256, f2-scale 34 from 1950 to 2000 respectively. There are more tornadoes in Shandong peninsula ,in the center of Shandong ,in the south of Shandong ,but there are less tornadoes in the north-west of Shandong .From 1950 to 1972 the quantity of the tornadoes is much high than that of the period after 1972. Remarkable season change exists about the emergence of tornado. In summer through mid-day to the evening there are more tornadoes.The duration of most of tornadoes is from a few minutes to more than ten minutes.