吉林西部季节性气象干旱的时空演化特征  

Temporal and Spatial Distribution Characteristics of Seasonal Meteorological Drought in West Jilin Province

作　　者：卢文喜[1] 安永凯[1] 宋文博[1] 于婷[1] 

机构地区：[1]吉林大学环境与资源学院,长春130021

出　　处：《吉林大学学报（地球科学版）》2016年第2期543-551,共9页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局项目(1212011140027;12120114027401;12120114056201);吉林大学研究生创新基金资助项目(2015083)~~

摘　　要：为减轻季节性干旱对吉林西部农业生产造成的影响,以吉林西部6个气象站1957—2010年的月降水量资料为基础,采用标准化降水指数(SPI)作为气象干旱指标。利用Daubechies小波分析法、重标极差分析法(R/S)和干旱频率法对吉林西部SPI时空演化特征进行了研究。结果表明:研究区各站点冬旱整体上有减轻趋势,而秋旱有加重趋势;各站点气象干旱状况呈现出持续性特征,乾安(夏季和秋季)、前郭(夏季)、通榆(春季、夏季和秋季)、长岭(夏季)干旱持续性更加强烈。研究区春旱高频区为扶余,夏旱高频区为扶余和白城,秋旱高频区为白城、通榆、乾安、前郭和长岭,冬旱高频区为扶余、长岭和白城。研究结果可为吉林西部防旱减灾提供参考。In order to reduce the influence of seasonal drought on agricultural production in west Jilin Province,the standardized precipitation index（SPI）was selected as meteorological drought index based on the monthly precipitation data collected from six sites in west Jilin Province during 1957to2010.Daubechies wavelet method,rescaled range analysis（RIS）,and drought frequency method were applied to analyze the temporal and spatial distribution characteristics of SPI.The results indicate that：winter drought of all over these sites presented a downward trend,while autumn drought was just opposite to the trend of winter drought.The six sites show the persistent drought characteristics as follows：summer and autumn drought in Qian＇an,summer drought in Qianguo,spring,summer andautumn drought in Tongyu,and summer drought in Changling.Fuyu is prone to spring drought,Fuyu and Baicheng to summer drought,Baicheng,Tongyu,Qian＇an,Qianguo and Changling to autumn drought,and Fuyu,Changling and Baicheng to winter drought.This paper provides a meteorlogical drought referrence for the western Jilin Province.

关 键 词：吉林西部 干旱 标准化降水指数 Daubechies小波分析 重标极差分析 

分 类 号：P641[天文地球—地质矿产勘探] P426.616[天文地球—地质学]