近百年来全球主要干旱区的干旱化特征 及其大尺度背景的分析

Some characteristics of climate changes in the Main Arid Regions of the globe over the Past 100 Years are gained by analyzing the grid temperature and precipitation data of the University of East Anglia in England. The increase of temperature is very remarkably during the past 100 years in the background of globe warming, and then the increase of temperature of arid regions of the globe is 0.94℃/100a, higher than the temperature of the globe. The increase of temperature of arid regions in North America is highest, reach 1.22℃/100a, and the increase of temperature of arid regions in South America is lowest, arrive at 0.31℃/100a。 On the scale of decade, the changes of precipitation are as same as the dry-wet index, but since the 70s in 20 Century the dry-wet index of the arid regions in South Africa, North America and the Central-East Asian are different from precipitation and all these are because of the remarkably increasing temperature in these areas. During the recent 100 years, the areas of globe arid regions are universal increasing and have reached 30% of the land areas, especially ,in Africa, the areas of arid regions reached 57.6%, is the biggest in all of the continents. These climate characteristics are explained by sea temperature and general circulation of atmosphere in this paper.