Abstract:

A method to simulate complex urban surface temperature was introduced. This method can be used to calculate urban net radiation flux based on a net all-wave radiation parameterization (NARP), and storage heat flux was obtained by an objective hysteresis model (OHM). Surface temperature was then calculated by a force-restore method. Different surface cover fractions were obtained using high-resolution satellite data in Shanghai, and then the average surface temperature in a grid box was determined with weights of area fractions of each land-cover types within the grid. The surface temperature on August 12, 2013 was simulated in Shanghai. The results show that the urban surface temperature increases rapidly in a daytime compared with that of other surface cover types, while it decreases slowly in a nighttime. By comparing the simulation results between MODIS land surface temperature and ground observational data, the spatial distribution of simulated surface temperature is more refined and closer to the ground observed data.

Key words: Land cover type, Energy balance, Surface temperature, Simulation