Responese Features Projection Of Land Surface Processes Over The Northern Hemisphere Under Climate Warming

Analyzed here are the model results of four group experiments from NCAR CCSM3.0 IPCC AR4 CLM3.0 simulations:CCSM3.0 climate of the 20th century run (20C3M), CSM3.0 SRESCCSM3.0 SRES A1B 21st century run. By comparing with 20C3M results, the differences given by the SRESA1B scenarios 21st century run are investigated to disclose the possible changes in thermal features, hydrological features and snow depth of land surface processes over the Northern Hemisphere induced by global warming.The results show that future surface temperature would increase larger in winter than summer. In the context of climate warming, rainfall, humidity, net radiation flux and ground temperature will continue to rise. In the season series, humidity, and net radiation increase higher in summer than in winter, rainfall and ground temperature increase higher in winter than summer. In time series humidity, rainfall on the half of the 21st century increase higher than the second half, the net radiation flux and ground temperature of the second half of the 21st century.In thermal features of land surface processes:sensible heat flux, latent heat flux and ground heat flux changes in a more consistent upward trend. In time series:the sensible heat flux in the early 21 st century a downward trend, upward trend for the mid-and late; latent heat flux on the half of the 21st century increase higher than the second half. In the season series, sensible heat flux and latent heat flux changes in a relatively uniform increase higher in winter than summer, increase in latent heat flux at the same time also significantly higher than the increase in sensible heat flux. The ground heat flux upward trend in the winter, but summer is showing a downward trend. In the regional series, sensible heat flux near the equator in summer significantly negative strip centers; sensible heat flux and latent heat flux of the external area has good relationship; a sense of great heat flux value corresponds to the latent heat flux area of the minimum area, minimum area of its corresponding latent heat flux area of great value. Changes in surface heat flux decreased significantly during the summer months, mainly in high latitudes.In hydrological features of land surface processes:The 21st century the Northern Hemisphere surface evaporation rate, surface runoff rate of the overall upward trend, while the soil moisture content have a significant downward trend. In the season series, the evaporation rate of future changes in the ground in winter lesser, than in summer evaporation rate, which also shows the future to enhance evaporation, will have more water vapor into the atmosphere than it is now. The world will become wet, especially in the summer; surface runoff rate increased considerably in winter, while a smaller increase in the summer; soil moisture decrease in the winter than in summer. In time series:Evaporation rate, the rate of surface runoff increase more on the half of the 21st, the increase of relatively slow growth in the later.In snow depth change of land surface processes:The 21st century the Northern Hemisphere snow depth has a significant downward trend. In the season series, the decrease in snow depth is more significant in the winter than in summer.