Numerical experiments of surface energy balance over China area based on GLDAS

In the absence of the long-term observations of the components of the water and land surface energy budgets,modeling can provide consistent fields of the land surface fluxes and states.We simulate the components of surface energy balance (SEB) equation using the land information system (LIS) of the global land data assimilation scheme (GLDAS) during the period of Novenben 2002 to Decenbero 2003 in China.The residual analyses of SEB indicate that the residuals distribution (RD) shows some spatial and temporal characteristics.The temporal characteristics of the RD suggest that LIS can simulate energy flux better in spring and summer than in other time.The spatial characteristics of the RD indicate that LIS can simulate energy flux better in places with relatively low latitude or low altitude than in the places with either the relatively higher latitude or higher altitude.This kind of the temporal and special distribution pattern is probablv related to the parameterization of snow albedo.The results of the comparison between simulated DLDAS and MODIS land surface temperature (LST) indicate that the main difference between two LST are within ±5 K.The scatter plots and standard deviation suggest that the simulated LST of night is 2-3 K more accurate than that of day time.