玉门市玉门镇年降水量多时间尺度变化特征分析

Analysis on Multiple Time Scales Characteristics of Annual Precipitation in Yumen City

利用玉门镇国家气象站1953—2017年降水资料,对玉门镇的年降水量进行分析。结果表明,玉门镇年降水量存在多时间尺度的变化规律,其中2年周期变化规律最为突出,多-少、少-多形式的2年周期变化分别出现32次和33次;另外,还存在多-少-多、少-多-少、少-多-多、多-少-少等3年周期变化规律,其中多-少-多形式出现11次,少-多-少形式出现9次,少-多-多形式出现6次,多-少-少形式出现4次。研究年降水量变化规律对防灾减灾具有重要意义。

The annual precipitation in Yumen Town was analyzed by using the precipitation data of National Weather Station of Yumen Town from 1953 to 2017.The results showed that the annual precipitation in Yumen Town had multiple time scales,and the periodic variation of 2 years was most prominent,the 2 years periodic changes of ＂more-less＂ and ＂less-more＂ occurred 32 times and 33 times,respectively.In addition,there was 3 years periodic change such as ＂more-less-more＂,＂less-more-less＂,＂less-more-more＂,＂more-less-less＂,which occurred 11 times,9 times,6 times,4 times,respectively.It is of great significance to study the change rule of annual precipitation for disaster prevention and reduction.