摘要
应用1961—2012年山东省26站夏季降水和西太平洋副热带高压特征量指数等资料,分析了山东夏季强降水的时空演变特征。结果表明:山东夏季强降水日数总体呈减少趋势,部分地区呈增多趋势,暴雨日在1989年前后发生突变;强降水日数比重呈增大趋势,半岛北部增大趋势明显,近208比重明显高于前期,且波动幅度加大,同样在1989年前后发生突变;大雨日降水强度增加,暴雨日降水强度减小,两者均在1990年代降水强度最大,半岛、东南沿海地区为强降水雨强高值区。对其成因初步分析发现,强降水时间变化与西太平洋副高南北位置关系密切,台风带来的强降水是影响东南沿海地区降水强度的关键因子。
Based on the summer precipitation data at 26 meteorological stations of Shandong Province during 1961 -2012, and com- bined the characteristic indexes of the Western Pacific subtropical high, the statistical methods were used to analyze the characteristic of summer heavy rainfall in Shandong Province. The result indicated that the total heavy rainfall days in the mass reduced and had a cli- mate jumping around 1989. The contribution percentage of heavy rainfall days presented increasing trend and was especially obvious in the north part of Shandong peninsula, it achieved a high level and fluctuated acutely in recent twenty years, and also had a climate jumping before and after 1989. The intensity of heavy rainfall became stronger, while rainstorm intensity became weaker, and both of them achieved the highest level in the 1990s. The maximum value of rainfall intensity was found in Shandong peninsula and southeast coast of Shandong Province. The changes of heavy rainfall could be related to the variation of the Western Pacific subtropical high, when the subtropical high ridge in summer moved north, more heavy rainfall days appeared, when it moved south, there were less heavy rainfall days. In addition, the heavy rainfall caused by typhoons was also a key factor influencing rainfall intensity in the southeast coast of Shandong Province.
出处
《干旱气象》
2013年第4期690-694,731,共6页
Journal of Arid Meteorology
基金
中国气象局小型基建项目"极端天气气候事件监测预测业务平台建设"资助
关键词
山东夏季
强降水
时空演变
成因
Shandong
summer
heavy rainfall
temporal- spatial distribution
causes