Analysis of the Meteorological Conditions in Serious Air Pollution Days in Changzhou from 2012 to 2014

Chen Boli; Lei Zhengcui; Dong Qin; Jiang Jun; Huo Yan

doi:10.16765/j.cnki.1673-7148.2017.01.012

Abstract：Using the air pollution monitoring data from Changzhou Environmental Monitoring Center,the meteorological observation data from Changzhou Meteorological Office and the NCEP/NCAR reanalysis data,the air pollution condition during 2012-2014 of Changzhou was analyzed,the surface pressure of heavy air pollution days was classified,and the weather conditions in January 2013 were focused on when the pollution was specially serious,some results were obtained as follows.1)There are totally 54 days of heavy air pollution in recent 3 years in Changzhou.Winter is the most polluted of all seasons,and the primary pollutant is mostly PM2.5.2)The surface pressure of heavy air pollution days can be generally summarized as 5 types:uniform pressure field,bottom of high pressure,back of high pressure,denatured high pressure and low pressure.Uniform pressure field type means poor diffusion conditions,which is the most common surface pressure for air pollution days.Bottom of high pressure type is generally accompa nied with cold air diffusion,which means transportation of pollutants from upstream.Back of high pressure type and denatured high pressure type are similar,whose air pollution is caused by the accumulation of pollutants due to the removal and weakening of cold high pressure.Low pressure type is generally pres ent in precipitation,but the heavy pollution of the early days or weakness of precipitation may lead to the maintenance of pollution.3)The air pollution is extremely serious in January 2013,a total of 14 heavy air pollution days occurred,the anomaly less of precipitation is one of the main reasons for frequent heavy pollution in this month.High temperature,high humidity and small wind are conducive to the formation of heavy pollution.4)Cold air activities frequently occur in autumn and winter,the local place often experiences the cycle as "uniform pressure field,bottom of the high pressure,cold air,cold high pressure and uniform pressure field",Heavy air pollution days occur mainly in the "interim period" of cold air.Therefore,surface pressure has an indicated role for the forecasting and warning of heavy air pollution.