To study the characteristics of atmospheric boundary layer over Lake Gyaring and Ngoring, a set of three nested numerical simulations with and without both the lakes were conducted 120 h using the mesoscale numerical model RAMS. The simulated results are reasonable comparing with the observation data. The obtained results are as follows: (1) The existence of both the lakes have a strong cold (warm) lake effect over the lake region in daytime (night time). (2) The lake-land breeze simulated with RAMS is reasonable. (3) There is a clear convergence zone over the narrow land between the two lakes, and the strong lake breeze of the west shore of Lake Ngoring reduced the one of east shore of Lake Gyaring. (4) Lake Gyaring and Ngoring reduced (enhanced) the boundary layer height over the lake during daytime (night). (5) Lake Gyaring and Ngoring significantly altered the surface energy flux, where the sensible heat flux is lower over the lakes than the surrounding land in daytime and the latent heat flux is higher over the lakes at night.

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