干旱地区农业研究2017，Vol.35Issue(1)：211-218,8.DOI:10.7606/j.issn.1000-7601.2017.01.32
基于MCI指标的甘肃省近50年干旱特征分析
Drought characteristics analysis of Gansu in recent 50 years based on meteorological drought composite index
摘要
Abstract
Based on the data of MCI value during 1961—2010 from the national climate center,we worked for the drought characteristics in Gansu province .The study shows that:the drought occurred in higher frequency in spring (55 .4%)and summer (55 .0%),and relatively lower frequency in autumn (41 .1%)and winter(46 .3%).The large-scale drought in the whole area occurred mostly in summer and autumn,but least in winter .Moreover,the drought-suf-fered area is still extended in various seasons during the latest 50 years .Considering frequency and severity of drought, longer different grades of drought occur in spring,and easily develop to the severe drought .In summer and winter,light and mederate drought easily happens in large area,but rarely severe drought occurs .Drought in autumn is mild with short duration Compared regional difference of drought occurrence,Gannan area has less drought,while eastern part of Hexi,northern part of Longzhong and southern part of Longnan have higher drought frequency .In the latest 50years,an-nual average and daily mean of drought duration,drought-suffered stations proportion and drought intensity were fluctuant without a significant sense .Drought intensity is the strongest in spring and the weakest in autumn .The significant nega-tive correlation was observed between drought intensity and rainless days .关键词
甘肃省/MCI指标/干旱特征Key words
Gansu province/MCI index/characteristics of drought分类
天文与地球科学引用本文复制引用
成青燕,高晓清,林纾,赵红岩,杨苏华..基于MCI指标的甘肃省近50年干旱特征分析[J].干旱地区农业研究,2017,35(1):211-218,8.基金项目
国家自然基金面上项目 （）
