基于索周法的辽宁省干旱周期演变特征研究  

Characterization of Drought Cycle Evolution in Liaoning Province Based on Cycle Exploring Method

作　　者：邓增宣 付玉娟[1] 张婉婷 DENG Zeng-xuan;FU Yu-juan;ZHANG Wan-ting(College of Water Conservancy,Shenyang Agricultural University,Shenyang 110866,China)

机构地区：[1]沈阳农业大学水利学院,辽宁沈阳110866

出　　处：《水电能源科学》2024年第10期73-77,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51609137)。

摘　　要：为探究辽宁省不同气候特征区域年、季干旱周期性规律,基于辽宁省22个国家地面气象观测站1961~2020年逐日降水数据,首先采用旋转经验正交函数对研究区进行降水分区,再计算不同时间尺度的标准化降水指数,利用索周法分析各分区不同尺度标准化降水指数周期特征,并与Morlet小波周期分析的结果进行对比。研究表明,索周法可以很好地应用于干旱周期分析。年尺度上,Ⅰ、Ⅱ区存在7年左右的显著周期规律,Ⅲ区周期规律以5年为主。季尺度上,Ⅰ、Ⅱ区各季节的周期规律以4~7年为主,而Ⅲ区周期尺度稍长,各季节主要表现为6~9年,各分区不同时间尺度周期演变特征存在一定的差异。In order to investigate the annual and seasonal drought cycle patterns of different climatic regions in Liaoning Province,based on the daily precipitation data from 22 national ground meteorological observation stations in Liaoning Province from 1961 to 2020,the rotated empirical orthogonal function(REOF)was used to divide the study area into precipitation division,and then calculated standardized precipitation index(SPI)at different time scales.The cycle characteristics of the SPI at different time scales in each division was analyzed by the cycle exploring method,and the results was compared with the Morlet wavelet analysis.The study indicates that the cycle exploring method can be well applied to drought cycle analysis.On the annual scale,there was a significant cycle pattern of about 7 a in subareasⅠandⅡ,and the cycle pattern in subareaⅢwas dominated by 5 a.On the seasonal scale,the cycle pattern of each season was mainly 4~7 a in subareasⅠandⅡ,while the cycle scale was slightly longer in subareaⅢ,mainly 6~9 a in each season.There was some differences in the cycle evolution characteristics of different time scales in each subarea.

关 键 词：干旱周期 REOF SPI指数 索周法 MORLET小波分析 

分 类 号：P426[天文地球—大气科学及气象学] S166[农业科学—农业气象学]