Impact Of The Application Of LCZ Underlay Data On The Simulation Of Urban Meteorological Environment During High Temperature Heat Waves

With the rapid development of urbanization,The morphological structure of buildings in urban areas is constantly changing.This has a significant impact on the urban meteorological environment.As a result,people's production,life and health have been greatly threatened and challenged.Therefore,there is a great need for more accurate early warning and forecasting of urban meteorology,which is inseparable from fine urban underlying surface data.This paper uses the classification method of local climate zones?LCZ?provided by the World Urban Database Access Portal?WUDAPT?to make LCZ fine urban underlying surfaces,and applies the WRF model to simulate high-temperature heat wave processes in Beijing,Shanghai,Wuhan,and Chongqing.In order to study and evaluate the impact of the application of LCZ fine underlying surface data on urban meteorological environment simulation.The main conclusions reached are as follows:?1?The surface heat flux simulated by the LCZ and MODIS underlays is different,and the difference is related to the characteristics of LCZ underlays.At 14 o'clock,the difference in sensible heat flux simulated by the two underlying surfaces in Beijing reached the maximum in the area of LCZ1-LCZ3,about 130W/m².In Shanghai,the simulated sensible heat flux in LCZ5-LCZ8 underlay areas between two underlays is the largest,with a maximumdifference of about 180W/m².?2?The difference between the 2m air temperature simulated by LCZ and MODIS at 05 is greater than the difference at 14.The simulated temperature difference between the two underlays corresponding to the underlay surfaces of Beijing LCZ3 and LCZ5 is the largest,about 3.2?,while that of Chongqing is the largest under the surface of the LCZ6,LCZ7,LCZ8,about 2?.?3?The underlying surface of the LCZ is more rough and uneven,and it will have a certain effect on weakening the atmospheric movement of the near-surface layer.Therefore,the wind speed simulated by the LCZ is weakened compared to MODIS.Beijing and Wuhan have the largest decrease in wind speed in the area of the underlying surface of LCZ1 and LCZ2.?4?The intensity of the heat islands in the four cities all show the characteristics ofUHI_LCZ2>UHI_LCZ5 UHI_LCZ6>UHI_LCZ8.The higher the impervious rate of the underlying surface,the ratio of height to width of the building,and the setting of anthropogenic heat parameters,the greater the strength of the heat island.?5?In Beijing,the difference of the net radiation?R_n?in different LCZs during the day is very small.|R_n| in the central city area?LCZ2?at night is significantly smaller than that of other LCZ types,and the maximum difference is about 30W/m².The surface heat storage?Q_g?exhibits a more significant spatial change,which is closely related to the surface impermeability?FRC_URB?of different LCZ surfaces.The higher the impermeability,the greater the |Q_g|.