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Numerical simulation of near-surface atmosphere during a radiation fog episode over the complex terrain is conducted. Results indicate that, the simulation of near-surface atmospheric wind, temperature, and humidity are very sensitive to land surface and boundary layer parameterization schemes. Simulation impacts of land surface and boundary layer scheme are manifested mainly in near-surface thermodynamic and dynamic quantities, respectively. The NOAH land surface scheme evidently overestimates the near-surface temperature, while underestimates the near-surface dew point and humidity during the fog formation period. The MYNN boundary layer scheme outperforms in near-surface wind simulation than other schemes. Combination of RUC land surface scheme and MYNN boundary layer scheme best simulates and reproduces the near-surface atmospheric conditions. Inter-comparison on the dynamic and thermodynamic of near-surface atmosphere among the experiments indicates that the simulation discrepancies are mainly in near-surface atmospheric stability, which could be the key factor in affecting the simulation performances. In particular, during the fog period, near-surface atmosphere is dominated by stable stratification, and the vertical velocity is relatively weak; before and after the fog period, the near-surface atmospheric stability is unstable.

Numerical Simulation of Near-Surface Atmospheric Conditions during a Radiation Fog over the Complex Terrain