摘要
基于华北地区67个气象站1962-2011年的实测资料,利用标准化降水蒸散指数(SPEI),统计了近50 a各站点出现的干旱过程,探讨了华北地区干旱发生强度的时空分布特征和中度以上干旱的空间分布特征,并对干旱成因进行了分析。结果表明,近50 a来华北地区干旱发生强度呈明显的增强趋势,尤其是在20世纪80、90年代;华北地区干旱发生强度的整体特征是西北和东南部地区较强,东北和中西部地区较弱;造成华北干旱的最主要因素是降水量的起伏变化,这在20世纪80,90年代表现得特别显著。
Based on the observed meteorological data of 67 meteorological stations in north China from 1962 to2011,and using standardized precipitation evapotranspiration index( SPEI),this paper conducted the statistic analysis of the drought occurring process at each station during recent 50 years,explored the spatiotemporal distribution characteristics of drought intensity and spatial distribution characteristics of drought with intensity moderate or above,and analyzed the drought cause. The results show that,in recent 50 years,the drought intensity in north China has an obvious enhancement tendency,especially in 1980' and 1990' of 20 century. The integrated spatial characteristics of drought intensity are stronger in northwest and southeast areas and weaker in northeast and middle west areas. The most important factors leading to drought in north China is the fluctuant change of precipitation,which is spatially obvious in 1980' and 1990' of 20 century.
出处
《自然灾害学报》
CSCD
北大核心
2014年第4期192-202,共11页
Journal of Natural Disasters
基金
国家自然科学基金项目(40961038)
生态经济学省级重点学科项目(5001-021)
西北师范大学知识与科技创新工程资助项目(NWNU-KJCXGC-03-06)
关键词
华北地区
标准化降水蒸散指数(SPEI)
干旱发生强度
时空分布
north China
standardized precipitation evapotranspiration index(SPEI)
intensity of drought
spatiotemporal distribution
