我国北方干湿演变规律及其与区域增暖的可能联系

用中国地区60个站的月平均气温和月降水资料，计算了我国北方地区地表水分收支、蒸发等水分过程.以此为基础，分析了三北地区（西北、东北和华北）地表水分的历史演变规律及其与气温变化的关系，特别分析了和区域增暖的关系.结果指出：在北方地区，地表水分有其显著的演变规律，不同地区其变化规律不同.而实际蒸发和气温的关系存在明显的阶段性，在1965年前与1965年后的相关关系是完全相反的.分析的结果还指出：当前北方地区的普遍增温是干旱化加剧的主要原因.

Dry/wet variation and its relationship with regional warming in arid-regions of northern China

Based on observational monthly precipitation and temperature datasets of 60 stations in China, the characteristics of the precipitation, evapotranspiration, potential evapotranspirtation and their relationship with regional warming have been analyzed, especially for three sub-regions in North China. The results indicate that there are significant characteristics of historical variations of surface hydrologic processes and regional differences in the arid-regions of North China. And there is a stage correlationship between evapotranspiration and surface air temperature. It means there is a positive correlationship between them in one period and negative correlation in another one. The results also indicate that the regional warming in North China is a main reason for the intensifying drying trend.