第1期陈荣等：银川市大气边界层逆温影响因素及其与冬季PM2.5的关系InfluencefactorsofatmosphericboundarylayerinversioninYinchuanCityandtherelationwithPM2.5inwinterCHENRong1，2，WANGJianying1，3，YANGWenjun1，4，CHENMin1，2，WANGQian1，2，LIKun1，2（1.KeyLaboratoryforMeteorologicalDisasterMonitoringandEarlyWarningandRiskManagementofCharacteristicAgricultureinAridRegions，CMA，KeyLaboratoryofMeteorologicalDisasterPreventingandReducingofNingxia，Yinchuan750002，China；2.YinchuanMeteorologicalBureauofNingxia，Yinchuan750002，China；3.NingxiaMeteorologicalServiceCenter，Yinchuan750002，China；4.HelanMeteorologicalStationofNingxia，Helan750200，China）Abstract：InordertoexplorethecharacteristicsandinfluencefactorsofatmosphericboundarylayerinversioninYinchuanCityandtheirrelationshipwithwinterPM2.5pollution,basedonthesoundingandsurfacemeteorologicalobservationdataatYinchuanmeteoro⁃logicalstationandtheairqualitymonitoringdatainYinchuanCityfrom2015to2020,thecharacteristicsofatmosphericboundarylayerinversionandsurfacemeteorologicalelementsareanalyzed.Andonthisbasisthattheinfluenceofinversionandsurfacemeteoro⁃logicalelementsonPM2.5pollutionweathersinwinterisexplored.Theresultsareasfollows:(1)Theinversionsinatmosphericbound⁃arylayeraremoreeasilytooccurintheearlymorningthanintheeveninginYinchuanCity,andmostoftheinversionsaregroundin⁃versions,theyarestrongerandthinnerthansuspensioninversions.Theinversionfrequencyandthicknessarethelargestinwinterandthesmallestinsummer,whiletheinversionintensityisthestrongestinautumnandtheweakestinsummer.(2)Inwinter,theinversionsareeasilytooccuronasunnydaywithaveragesurfacewindspeedfrom1.0to1.5m·s-1andrelativehumidityfrom30%to60%.(3)GroundinversionisoneofthemainmeteorologicalfactorsaffectingPM2.5pollutionweathersinwinter.Whentheinversionthicknessex⁃ceeds596mandtheintensityexceeds1.4℃·(100m)-1,PM2.5pollutionweathersareeasilytooccur,andthepollutionisaggravatedwiththeincreaseofinversionthicknessandintensity.(4)UnderPM2.5pollutionweathersinwinter,...
