Abstract:Taking into account different anthropogenic heat (AH)sources from manufactories, vehicles and residents, respectively, we estimate the AH flux using various data in Guangzhou, 2009, including energy consumptions by industry and residents, amounts of vehicles, traffic volumes of the main roads, etc. The mean AH flux is 411 W ·m-2, and the peak value is 723 W ·m-2 which occurs at 11:00LST. We find that AH mainly comes from industry, whose contribution is up to 686%. Then we carry out a sensitivity test about AH flux using WRF/UCM model. We design four scenarios, including (1)theres no AH; (2)AH without daily variation; (3)AH with daily variation; (4)AH doubled. The result shows that the difference of sensible heat flux from urban is generally as much as that of the AH flux. Temperature in urban canopy is not sensitive to the change of the AH flux, and the maximum difference between scenario 3 and scenario 4 is just about 02 ℃. But the rise of AH flux makes TKE at the first model level increasing by about 01 to 04 m2 ·s-2. And AH also enhances the strength of turbulent eddies in the urban boundary layer. The vertical velocity increases by about 01 m ·s-1 in scenario 3. The contribution rate of AH to the urban heat island intensity reaches the peak at noon, which is about 20% in scenario 3 and nearly 40% in scenario 420% is the peak value in scenario 2 which occurs at midnight.