Abstract:The high temperature weather process occurred in the region along the ShanghaiNanjing Expressway in July of 2009 is simulated by the WRF model with three different land surface parameterization schemes (SLAB, NOAH, and RUC). The results show that: (1) The simulation results integrated the land surface parameterization schemes in the WRF model is closer to the reality, and the sensitivity of high temperature weather simulation to land surface physical processes is significant. (2) The simulated temperature values of Meicun Station based on the three different land surface schemes are close to the observed values, and when the NOAH scheme is coupled into the WRF model, the prediction accuracy of air temperature simulation is the highest. (3) The simulations coupling the three different land surface schemes show that the sensible heat flux is high and the latent heat flux is low along the ShanghaiNanjing expressway. The integrated simulation coupling the NOAH scheme is more satisfactory. (4) The vertical movement simulated by the WRF model is sensitive to the selection of different land surface schemes and the NOAH scheme gives more reasonable results than the others. (5) In the simulations on the relative humidity, there are some differences between the three schemes, and the SLAB scheme performs better than NOAH or RUC. (6) All the horizontal wind speeds at the ground simulated by the three land surface schemes are small, which is conducive to the emergence of high temperature at the surface. The simulation of wind speeds by WRF model is sensitive to the selection of different land surface processes. Results simulated by the NOAH scheme are better in effectiveness than that by the others.
