乳源1965—2022年汛期降水的时空特征

Spatial and Temporal Characteristics of Flood Season Precipitation in Ruyuan from 1965 to 2022

根据乳源国家气象观测站1965—2022年和13个区域自动气象站2014—2022年的降水资料,采用滑动t检验、Morlet小波分析等方法分析近58 a乳源降水的时空变化特征。结果表明:乳源年均降水量呈单峰型,峰值出现在5月和6月;乳源汛期降水量总体是较为明显增加的趋势,存在6、15、34 a 3个振荡周期,34 a周期是汛期降水量变化的第一主振荡周期;汛期降水量的变化趋势和年降水量的变化趋势基本一致;乳源汛期降水的空间分布总体呈现自西南向东北递减的趋势。

Based on the precipitation data of the National Meteoroloaical Observation Station in Ruyuan from 1965 to 2022 and the 13 regions automatic meteorological stations from 2014 to 2022,the spatial and temporal variation characteristics of precipitation in Ruyuan in the past 58 years were analyzed using sliding t-test,Morlet wavelet analysis and other methods.The results showed that the annual average precifitation in Ruvuan presented a unimodal pattern with the peak occurrina in May and June.The precipitation in the flood season in Ruyuan showed an overall increasing trend,with three oscillation periods of 6 a,15 a and 34 a,and the 34 a cycle was the first main oscillation period of the change in flood season precipitation.The change trend of flood season precipitation was basically consistent with the change trend of annual precipitation.The snatial distribution of flood season precipitation in Ruvuan generally showed a decreasing trend from southwest to northeast.