【摘要】 利用青州市 1 980～ 1 999年降水资料 ,重点研究了 4～ 9月份的自然降水宏观特征与 2 0年的变化趋势。计算了各类天气系统对降水的贡献 ,分析了各降水云系的时空分布特征及与降水的关系 ,研究了城区、山区、平原的降水差异。结果指出 :青州1 990～ 1 999年比 1 980～ 1 989年降水量增加 ,主要原因是气旋活动增加、积云类对流性降水加强。局地降水差异是城区 >山区 >平原。这些研究对掌握青州的气候演变规律 ,提高天气预报水平和实施人工影响天气作业 ,具有现实意义。更多还原

【Abstract】 Based on the rainfall data of Qingzhou, Shandong Province,from 1980 to 1999, the Macro-character and variation tendency of precipitation from April to September are mainly investigated. The contributions of different weather systems to rainfall are calculated, the relationship between the rainfall and the characters of the spatial and temporal distributions of rain clouds is analyzed. Then, the rainfall differences in urban, mountainous and plain areas are also studied. The results show more rainfall were observed from 1990 to 1999 than that from1980 to 1989. The main reason is the increase of convective rainfall due to cyclone activities. The regional precipitation differences show that the urban area has more rainfall than the mountainous area. The rainfall in the mountainous area is more than that in the plain area.更多还原