Comparison of energy balance in summer and winter at Miyun station

Based on the turbulent fluxes data observed during summer(August) and winter(January) in 2007 at Miyun station, the energy closure and energy balance on heterogeneous underlying surface were analyzed. The results present that :( 1) The EC sensible and latent heat fluxes underestimated the surface available energy by 26%, it can be reduced to 24% after soil heat flux correction. (2) The peak values of all terms of energy balance, except sensible flux, increased largely from winter to summer. The Five days average of Bowen ratio (H/LE) was ranged from 3.9 in winter to 0.17 in winter.