关键词: 沙漠化, 区域气候变化, 数值试验, 正反馈

Abstract: The GCM-SSiB global spectral model has been used to study the influence of desertification expanding over China on regional climate. Two numerical experiments are set up. The results show that widen desertification made annual mean surface air temperature lower, sea level pressure higher, low level zonal wind velocity and the monsoon stronger, summer updraft motion weaker, winter downdraft motion stronger, precipitation decreased obviously, also surface evaporation flux, sensible heat flux and latent heat flux decreased obviously. Regional climate will incline to be cold and dry and wind velocity will strengthen along with desertification. There exists positive feedback between desertification and regional climate deterioration.

Key words: desertification, regional climate, numerical experiment, positive feedback