【摘要】 利用1971—2000年聊城市8个气象站降水资料,分析了自然降水的宏观特征与变化趋势,并分别统计了各类天气系统对降水的影响;在此基础上进一步研究了各类降水云系的时空分布特征及与降水的关系。结果表明:聊城市30年来降水总体呈下降趋势,降水局地差异明显。近10年降水有所增加的主要原因是气旋活动增加、积云类对流性降水加强。更多还原

【Abstract】 Base on the rainfall data of Liaocheng city from 1971 to 2000,the characteristic and variation tendency of precipitation are analyzed.The influence to rainfall of different weather systems is also analyzed and the spatial and temporal distribution of rain clouds is studied.The results show:The precipitation appeared downtrend on the whole and the local difference was obvious.But the precipitation increased in the recent 10 years.The main reason was the increase of convective rainfall due to the cyclone activities.更多还原