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《Meteorological Science and Technology》 2017-04
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Weather Condition Analysis of a Urban Heavy Pollution Event

Du Xiaoxiao;Ma Li;School of Atmospheric Science,Chengdu University of Information Technology,Plateau Atmospheric and Environment Key Laboratory of Sichuan Province;Sichuan Meteorological Bureau;  
Based on the hourly high-density meteorological observation data and the Air Quality Index announced by the Ministry of Environmental Protection of China, we discuss and analyze the meteorological conditions of the pollution process from January 9 to 4 February 2014 in the urban area of Mianyang,Sichuan Province.This study is conducted from three aspects:slight,moderate,and severe pollution.Analysis indicates that the wind speed and the thickness of the atmospheric mixed layer are negatively correlated with the air quality index,with the correlation coefficients being -0.637 and -0.487.The types of air pollution are discussed.The wind speed is negatively correlated with the air quality index in slight pollution with a correlation coefficient of -0.739.The diurnal variation of wind speed shows a single-peak trend,with the peak value appearing in 12:00-18:00.The wind direction is given priority to the southeast and northwest flow,and the air pollution could be aggravated by the southeast flow.The thickness of the atmospheric mixed layer in the slight pollution condition is 583.78 m,and it is 5 m lower in moderate pollution than in severe pollution,481.92 mand 487.69 m,respectively.While the thickness of the atmospheric mixed layer on the low side,the diurnal variation is characterized as low in the morning and evening,high in the afternoon.According to the Blown-up Theory,the V-3θ plot of the pollution process has instructive effect in forecasting strong convection and precipitation.
【CateGory Index】: X51
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