THE SIMULATION STUDY ON LAND SURFACE ENERGY BUDGET OVER CHINA AREA BASED ON LIS-NOAH LAND SURFACE MODEL

摘要

The availability of time series of water and land surface energy budgets over China area is essential for understanding the environmental system and potential climate change in this area. However, consistent observations of the land surface state variables are routinely unavailable. In the absence of long-term observations of the components of the water and land surface energy budgets, modeling can provide consistent fields of land surface fluxes and states. We simulated the components of surface energy balance (SEB) equation using Land Information System (LIS) for time period of 2002.11-2003.12. Residual analyses of SEB indicate that the distribution of residuals show some spatial and temporal characteristics. The temporal characteristics of residual distribution suggest that LIS can simulate energy flux better in spring and summer than in other time. The spatial characteristics indicate that LIS can simulate energy flux better in places with relative low latitude or low altitude than in places with either higher latitude or higher altitude. This kind of temporal and special distribution pattern probably related to the parameterization of snow albedo. The results of comparison between simulated and MODIS land surface temperature(LST) indicate that mostly difference between two LST are within ±5K. The scatter plots and standard deviation suggests that the simulated LST of night_view_time is 2-3K accurate than that of day_view_time.