Numerical Simulation Of Revised Land-use And Anthropogenic Heat’s Impacts On Shanghai’s Atmospheric Environment With WRF/Urban

With the development of human society, the process of urbanization is accelerating. The natural underlying surface has been changed by large-scale urban development, increasing the heat emission form human activities. The goal is to study the impact of Shanghai’s development on atmosphere environment. This paper uses Global Land Cover Product in 2009 (GLC2009) to revise the land use data in WRF model, divides Shanghai’s land use into three categories (Commercial、High Intensity residential、 Low Intensity residential) by building’s floor information, estimates anthropogenic heat and its diurnal profile by Annals of Statistics. Based on the above info, this paper applies the integrated WRF/Urban modelling system to simulate a heat wave event during 13-14 Aug 2010 to evaluate the new land cover and anthropogenic heat in UCM model, then compare the three urban models’ performance, especially in routine meteorological elements、heat island index、boundary layer structure and surface energy balance.First using UCM model to examine the impact of land cover and anthropogenic heat on urban atmosphere environment, the results shows:(1) Different meteorological elements have different sensitive to land cover and anthropogenic heat. Temperature and high temperature strength are sensitive to anthropogenic heat, while specific humidity and the scope of high temperature are sensitive to the land use change. Wind speed simulation is generally higher, but obviously decreased in the case of new land cover. Anthropogenic heat increase the wind speed in city area. UCM model achieves good simulation effect on heat island by updating static information.(2) Land cover and anthropogenic heat have a certain impact on boundary layer structure. Land cover is more sensitive to planet boundary layer height than anthropogenic heat. The effect of land cover increasing temperature in vertical direction is below 900 meters, while the effect of anthropogenic heat can extend to 1400 meters.Secondly, comparing the impact of UCM+AH、BEP and BEM models on atmosphere environment, it turns out that:(1) The effect of temperature simulation in good turn is:UCM+AH、BEM and BEP. There is no significant difference in wind direction simulation among three urban models. The best performance model in wind speed simulation is BEM, and UCM+AH scores the worst.(2) Heat storage is a key factor in emerging nocturnal heat island. UCM+AH and BEM models play a good performance in simulating heat island. BEM and BEP models are higher than UCM+AH model in net radiation flux simulation, but UCM+AH model has the most heat storage. Heat storage is an important cause in heat island.(3) Three models has no distinction in simulating planet boundary layer height. For urban stations, BEM and BEP models estimate PBL height higher than that of UCM+AH in daytime, while during night the PBL height simulated by BEM and UCM+AH is higher than BEP. It is anthropogenic heat considered in BEM and UCM+AH models that result in this phenomenon and strengthen the turbulence exchange and air flow in nightmare boundary layer.