Climatology of the Meteorological Factors Associated with Haze Events over Northern China and Their Potential Response to the Quasi-Biannual Oscillation-中国期刊网

摘要 AnupswinginhazeweatherduringautumnandwinterhasbeenobservedoverNorthandNortheastChinainrecentyears,imposingadverseimpactsuponlocalsocioeconomicdevelopmentandhumanhealth.However,suchanincreaseintheoccurrenceofhazeeventsanditsassociationwithnaturalclimatevariabilityandclimatechangearenotwellunderstood.Toinvestigatetheclimatologyofthemeteorologicalfactorsassociatedwithhazeeventsandtheirnaturalvariability,thisstudyusesameteorologicalpollutionindexcalledPLAM(ParameterLinkingAir-qualitytoMeteorologicalconditions)andERA-Interimreanalysisdata.TheresultssuggestthathighPLAMvaluestendtooccuroversouthernpartsofnorthernChina,implyingtheweatherconditionsoverthisareaarefavorablefortheoccurrenceofhazeweather.Fortheperiod1979–2014,theregionalmeanPLAMshowsanoverallincreaseacrossBeijing,Tianjin,andHebeiProvince,andpartsofShanxiProvince.Also,aperiodicityof28–34monthsisfoundinthetemporalvariationofPLAM,whichimpliesapotentialassociationofPLAMwiththestratosphericQuasi-BiannualOscillation(QBO).ByusingtheQBOindexduringtheautumnandwinterseasonsintheprecedingyear,anincreaseinPLAMisfoundforthewesterlyphasesoftheQBO,relativetotheeasterlyphases.Anupper-troposphericwarmingisalsofoundinthewesterlyphases,whichcaninduceastablestratificationthatfavorstheincreaseinPLAMacrossthemidlatitudes.Themodulationsoflarge-scaleenvironmentalfactors,includingmoiststaticstability,verticalvelocity,andtemperatureadvection,alsoacttoenhancePLAMinthewesterlyphases.However,thebaroclinictermofmoistpotentialvorticityat700hPatendstodecreaseoverthesouth,andanincreaseinlow-levelascentisfoundoverthenorth.ThesefactorscanreducePLAMandpossiblylimitthestatisticalsignificanceoftheincreasedPLAMinthewesterlyphasesoftheQBO.

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Climatology of the Meteorological Factors Associated with Haze Events over Northern China and Their Potential Response to the Quasi-Biannual Oscillation

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Climatology of the Meteorological Factors Associated with Haze Events over Northern China and Their Potential Response to the Quasi-Biannual Oscillation

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