Based on conventional meteorological data and ERA5 reanalysis data,the weather types of the heavy pollution processes in Luohe during the autumn and winter of 2015-2019 is classified and their characteristics are analyzed.Thereafter,the relationship between heavy pollution and meteorological factors under different weather types is discussed.The results show that:(1)The surface synoptic condi-tion during the autumn and winter heavy pollution period in Luohe can be divided into six types:uniform-pressure type,high-pressure front type,high-pressure rear type,high-pressure bottom type,inverted-trough top type and low-pressure belt type.(2)All types of heavy pollution weather show the characteris-tics of high relative humidity,low boundary layer height,and low atmospheric self-purification index.The pollution weather processes of uniform-pressure type,high-pressure rear type and inverted-trough top type have high static stability index and low surface ventilation,dominated by the static and stable pollu-tion,while the pollution weather of high-pressure front type,high-pressure bottom type and low-pressure belt type have faster wind speed and higher surface ventilation,which is prone to transport-type pollution.(3)The forecast indicators of different heavy pollution weather types are different.The static stability in-dex,self-purification capability index and surface ventilation rate forecast are better indicators for the uni-form-pressure type pollution.The pollution of high-pressure front type can be indicated by the static sta-bility index and surface ventilation volume.For the pollution of high-pressure bottom type,the elements of relative humidity and wind speed are indicative.Only the wind speed has indicative significance for in the pollution of inverted-trough top type and low-pressure belt type.
heavy pollutionweather type classificationmeteorological factorcorrelationforecast indication
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