Classification of Heavy Pollution Weather in Luohe in Autumn and Winter and Its Correlation with Meteorological Factors
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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