Simulation Of Haze In Beijing-Tianjin-Hebei Region And Causes Based On Regional Climate Model

The industrialization and urbanization of the Beijing-Tianjin-Hebei region consumes a large amount of fossil fuel resources every year.Thermal power plants and heavily polluting enterprises emit a large amount of smoke?powder?dust,SO₂,NO_x,etc.Which are the main components of haze pollution.In recent years,the state and various levels of government have gradually strengthened their emphasis on air quality,and issued a series of policies and regulations,such as the release of the "Air Pollution Prevention Action Plan",during which China's air quality has also been significant improvement.However,the situation facing the atmospheric environment is still grim,especially in the Beijing-Tianj in-Hebei region,which is still a frequent occurrence of haze,and it is necessary to find a balance between air pollution control and economic development.Based on the historical data of air quality,this paper uses the WRF model to simulate the haze in the Beijing-Tianj in-Hebei region and analyzes the causes of haze.The regional atmospheric environment simulation analysis system is designed and implemented,and the monitoring data and simulation results are visually analyzed to provide support for regional pollution research.The specific research contents are as follows:?1?Establishment of air quality data and meteorological assimilation data database:1500 meteorological stations,including AQI,PM_2.5,PM₁₀ and SO₂,were collected through various channels,and the time spans from 2000 to the present.Air quality data hour by hour.At the same time,the ERA assimilation data from more than 30 years since 1979 was downloaded,and the data volume reached more than 10 TB.Based on these data,the corresponding database is established,which lays a data foundation for subsequent data simulation and platform construction.?2?Temporal and spatial distribution characteristics of PM_2.5 in the Beijing-Tianj in-Hebei region:Since the release of the Air Pollution Prevention and Control Action Plan,the monitoring data of the PM_2.5 meteorological site in the Beijing-Tianj in-Hebei region from 2014 to 2018 was analyzed in detail.From the daily average concentration distribution,the annual change of pollution days,the monthly change trend of daily average index and the number of heavy pollution days,the distribution characteristics of haze pollution in Beijing-Tianjin-Hebei region were analyzed.?3?Analysis of water vapor and soot emissions from thermal power plants in the Beijing-Tianjin-Hebei region:Using the installed capacity and power generation data of thermal power plants published by the National Bureau of Statistics,calculate the water vapor emissions of thermal power plants in the Beijing-Tianjin-Hebei region.The dust removal equipment of thermal power plants was classified,the dust and PM_2.5 filtration efficiency of various dust removal equipments were counted,and the annual total dust emission of coal-fired power plants in Beijing-Tianjin-Hebei region was analyzed.?4?Construction of WRF-Chem simulation parameterization scheme:By analyzing the development of air quality model and combining the characteristics of Beijing-Tianjin-Hebei region,the simulated research area and corresponding parameterization scheme were selected,and WRF-Chem was constructed.A list of simulated anthropogenic emissions sources.?5?Simulation results and causes of haze in Beijing-Tianjin-Hebei region:Data processing was performed on the results of haze simulation,and relevant pollutant indicators were extracted and visualized.First,the simulation results are compared and the reliability of the results is verified.Secondly,combined with the geographical and climatic characteristics of the Beijing-Tianjin-Hebei region,a detailed analysis of the continuous heavy pollution process in December 2016 was carried out,and the causes of haze were analyzed.?6?Development of regional atmospheric environment simulation analysis system:Based on the data collected and simulated in the previous period,the data is supported by the computer graphics processing technology,and the air quality historical data and simulation results of the Beijing-Tianjin-Hebei region are visually analyzed and displayed.The haze simulation input file pre-processing work provides relevant computer-aided support for meteorological researchers and government agencies.