攀西地区可能蒸散率变化特征分析

Study on V ariation Characteristics of Potential Evapotranspiration Rate in Panxi

利用攀西地区1960-2021年21个国家气象站年降水量、逐日平均气温观测数据,计算其可能蒸散率(PER),并对干燥度变化趋势进行分析,结果表明:攀西地区PER有明显的高、低区域分布;PER年际变化最剧烈区域位于攀西地区西部边界,亚湿润区比湿润区年际变化大;由攀西地区北部向西南部地区呈逐渐变干燥(PER值变大)趋势;亚湿润区中普格、西昌未发生突变,最北端的甘洛突变时间最早,攀枝花境内站点均发生突变,地域相近突变时间较接近,亚湿润区突变时间整体晚于湿润区突变时间;攀西地区生物温度均呈上升趋势,西北、东南部变化较低,并以西北-东南为中线,向东、西方向,中间区域逐渐升高;降水量年际变化呈明显的北升南降趋势;攀西地区西南部向东北部逐渐由暖干化趋势变为暖湿化趋势。

Based on the annual precipitation and daily average temperature of 21 national meteorological stations in Panxi from 1960 to 2021,the PER(Potential Evapotranspiration Rate)was calculated,and the variance of the soil surface aridity index was analyzed.It is found that the spatial distribution of PER showed obvious high and low regional distribution.The area with the most severe interannual change of PER was located at the western boundary of Panxi,and the interannual change of subhumid was greater than that of humid area.It was gradually becoming dry(the PER value becomes larger)from the northern to southwest region,no mutation occurred in Puge and Xichang in the subhumid,the mutation time of Ganluo in the northernmost was the earliest,The mutation occurred at all stations in Pan-zhihua,and the mutation time was close to that in the similar regions.The mutation time in the sub-humid area was later than that in the humid area.The ABT showed an upward trend in Panxi,the changes in the northwest and southeast were relatively low,with northwest-southeast as the middle line,to the east and west,and the middle area gradually rose.The annual precipitation showed an obvious trend of rising in the north and falling in the south.From the southwest to the northeast of Panxi area,the trend of warming and drying gradually changed into the trend of warming and wetting.