北京地区精细化的降水变化特征

应用2007~2010年北京地区123个数据质量较好的自动气象站逐时降水数据,分析了该地区夏季不同级别降水的空间特征和4~10月降水的时间变化特征。结果表明,北京地区2007~2010年自动站年平均夏季降水量分布与1978~2010年常规站多年平均夏季降水量分布较一致,夏季总降水小时数明显高值中心在北部山区和城区以西山区,小时雨强以东北部、城区为高值中心,自东向西趋势递减,7月城区小时雨强最强。

Subtle Precipitation Characteristics in Beijing Area

Based on the hourly precipitation data from 123 automatic weather stations (AWS) during the period of 2007-2010 over Beijing area, the variations in summer precipitation amount, precipitation hours, and precipitation intensity of different categories were analyzed. Furthermore, the monthly precipitation characteristics from April to October were also studied. The results indicate that the AWS precipitation distribution in the summer of 2007-2010 is similar to the precipitation distribution from ordinary stations for the summer of 1978-2010. In summer, the center of the distribution of precipitation hours was located in the north and west mountainous area. The center of the most intensive hourly precipitation was located over an urban area and the northeast of Beijing. The shortly intensive precipitation is stronger in July than other months.