永安市近50年降水变化特征分析

Analysis on the Characteristics of Precipitation Change in Yong’an City during the past 50 years

利用永安国家基准气候站1969—2018年降水资料,分析总结了近50年降水变化特征。结果表明:永安市年降水量呈下降趋势,气候倾向率-7.6 mm/10年,在1975年及2018年发生突变。一年中降水集中在3—6月,5月为降水量峰值;降水时段集中在春季,春季降水占50%以上,呈显著下降趋势,是导致全年降水下降的直接原因。1969—2018年有11年降水异常度较大,大部分年份发生较明显的ENSO事件,说明厄尔尼诺或拉尼娜现象发生时伴有降水非正常年份。

Based on the precipitation data of Yong’an national standard climate station from 1969 to 2018,the characteristics of precipitation change in recent 50 years were analyzed and summarized.The results showed that the annual precipitation of Yong’an City showed a downward trend,the climate tendency rate was-7.6 mm/10 a,and the abrupt change occurred in 1975 and 2018.