Comprehensive evaluation of typical planetary boundary layer (PBL) parameterization schemes in China. Part II: Influence of uncertainty factors

Abstract. This study focuses on the uncertainties that influence numerical simulation results of meteorological fields (including horizontal resolution, vertical resolution, near-surface scheme, initial and boundary conditions, underlying surface update, and update of model version). By further evaluating and analyzing the uncertainty factors, it is expected to provide relevance for those scholars who are devoted to factor analysis, in order to make the results closer to the observed values. In this study, a total of 12 experiments are set up to analyze the effects of the uncertainties mentioned above, and the following conclusions are drawn: (1) Horizontal resolution has a greater effect than vertical resolution. (2) The simulated effects of temperature and wind speed in the near-surface scheme are smaller than those in the PBL scheme. (3) The initial and boundary conditions of different products have the most remarkable effect on relative humidity, and the simulation results of EC data are the best. (4) The updates with urban and water bodies as the underlying surface have a more significant contribution to the meteorological fields, especially on temperature. (5) The update of the model version does not necessarily optimize the model results. In general, the configuration of uncertainties needs to be considered comprehensively according to what you need in order to obtain the best simulation results.