通过对1949-1999年逐月NCEP/NCAR感热通量和潜热通量再分析资料的分析,发现在我国北方干旱区感、潜热通量的年际变化存在着2~3个敏感区,分别位于西北和华北及内蒙一带。其中以东部的华北-内蒙区最为显著。代表上述两个地区通量的平均年际变化表明,在20世纪60年代后期,感、潜热通量存在一个突变;进入70年代以后,上述两个地区的感热通量保持在一个较高的水平上,潜热通量的变化则呈现出相反的变化。

The sensible and latent heat fluxes were analyzed by using NCEP/NCAR reanalysis data. The results indicated that the inter annual changes of the sensible and latent heat fluxes have 2~3 sensitive regions in arid region of Northern China. They located in Northwest, North China and Inner Mongolia, respectively, the North China, and Inner Mongolia region in East China was the most significant region. The mean inter annual change of representative regions such as Northwest North China and Inner Mongolia showed that the sensible and latent heat fluxes appear an abrupt change in the late 1960's, and the sensible heat flux keep a higher value in the above-mentioned two regions and the change of the latent heat flux appear opposite change in 1970's.