郑州市夏季降水的变化特征

利用1955—2011年郑州市夏季降水日逐分钟降水量,对郑州市降水日的降水量及其场次的年内和年际变化进行分析.结果表明:郑州市1981—2010年夏季降水量场次及其降水量平均分别为42.7场和8.4 mm,二者均有显著的变化趋势,气候倾向率分别为-2.2场/10a和0.56 mm/10a.郑州市场次降水平均持续时间和实际维持时间具有显著的线性相关关系.不管用场次降水量最长持续时间与其对应降水量的关系,还是利用场次最大降水量与其对应持续时间的关系,均表明随着时间的延长,降水量的数值会增加,反之依然.

Variation Characteristic of Summer Precipitation in Zhengzhou

Using minute precipitation of rainday during summer from 1955 to 2011 in Zhengzhou,Henan Province, annual and interannual variations of the precipitation and its events were analyzed. The results showed that the average of the precipitation events and its rainfall during summer in Zhengzhou were 42.7 times,8.4 mm respectively,both of them had a distinct linear trends,which climatic trend rate were-2.2 times per 10a,0.56 mm/10a respectively. The average duration and actual precipitation length had the distinct correlation. No matter using the relation between the longest duration of precipitation and its corresponding precipitation,or the relation between the maximum precipitation and its corresponding actual duration,both showed that with the extension of time the precipitation would increase,and vice versa .