摘要
利用常规气象资料和ERA5再分析资料,对2015-2019年秋冬季漯河重污染过程进行天气学分型,并分析其天气特征,探讨不同分型下重污染与气象因子的关系。结果表明:(1)漯河秋冬季重污染天气的地面天气形势分为均压场型、高压前部型、高压后部型、高压底部型、倒槽顶部型和低压带型6种。(2)各重污染天气分型多呈现相对湿度高、边界层高度低、大气自净指数低的特征。其中,均压场型、高压后部型和倒槽顶部型静稳指数高,地表通风量低,以静稳型污染为主;高压前部型、高压底部型和低压带型风速和地表通风量较高,易出现传输型污染。(3)各重污染天气分型对重污染天气的预报的指示作用不尽相同。其中,均压场型的大气静稳指数、自净能力指数和地表通风量的预报指示性较好,高压前部型的大气自净能力指数和地表通风量的指示性较好,高压底部型的相对湿度和风速有指示意义,倒槽顶部型和低压带型仅风速具有指示意义。
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 20152019 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 condition 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 characteristics 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 pollution,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 index,self-purification capability index and surface ventilation rate forecast are better indicators for the uniform-pressure type pollution.The pollution of high-pressure front type can be indicated by the static stability 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.
作者
武威
单铁良
Wu Wei;Shan Tieliang(Luohe Meteorological Office,Luohe 462300,China;Luohe Fog-haze Monitoring and Early Warning Engineering Technology Research Center,Luohe 462300,China)
出处
《气象与环境科学》
2024年第4期69-77,共9页
Meteorological and Environmental Sciences
基金
河南省气象局预报员专项(KY201932)。
关键词
重污染
天气分型
气象因子
相关性
预报指示
heavy pollution
weather type classification
meteorological factor
correlation
forecast indication
