【作者】 王海梅； 李政海；

【Author】 WANG Hai-mei1,2 LI Zheng-hai2 1.Inner Mongolia Meteorological Institute,Hohhot,010051,China 2.Life Science Department,Dalian Nationalities University,Dalian 116600,China

【机构】 内蒙古自治区气象科学研究所； 大连民族学院生命科学学院；

【摘要】 以锡林郭勒盟15个气象站点1981～2007年的月平均气温、月累积降水量数据为基础,在Arcgis软件的支持下,得到DeMartonne干燥度的空间数据。研究结果表明,锡林郭勒盟27年平均干燥程度自东向西递增;1981～2007年,锡林郭勒盟整体上表现出干燥度数值下降、干旱程度上升的趋势;从干燥度的年代,20世纪80年代和90年代是锡林郭勒盟气候相对湿润时期,21世纪初期,锡林郭勒盟大部分地区的气候呈现干燥度指数减小、干燥程度加大的趋势,干性干旱区在空间分布上占据了主导地位,结果也打乱了原有的气候带状交替格局。21世纪初与80年代相比,各干燥度等值线的位置均发生了明显的东移现象。更多还原

【Abstract】 The average monthly temperature data and accumulated precipitation of 15 meteorological stations of Xilinguole League from 1981 to 2007 were used in this research.Supported by Arcgis software,the spatial data of De Martonne climate aridity were obtained,at the same time;the Spatial-temporal changes of climate aridity were analyzed according to the knowledge of meteorology and ecology.The results showed that the drought degree increased from east to west.From 1981 to 2007,the climate in Xilinguole steppe region showed a general tendency of declining Idm value and rising drought degree.The changes process of climate aridity showed that 1980’s and 1990’s were the relatively humid periods;the drought degree was roughly the same in the two periods.The drought degree in 21st century showed an obvious increasing trend in most parts of Xilinguole,drought arid zone was widely distrusted,and the original climate pattern of alternate strips was disturbed,too.Compared with 1980`s,the position of Idm grade ranges have displaced obviously eastward in the 21st century.更多还原