不同污染等级下阳泉市PM_(2.5)传输特征和潜在源区分析  

Transport Characteristics and Potential Source Areas of PM_(2.5) in Yangquan City Under Different Pollution Levels

作　　者：马星芬 王雁 闫世明 冯飞 MA Xing-fen;WANG Yan;YAN Shi-ming;FENG Fei(Meteorological Bureau of Yangquan City,Yangquan 045000,China;Shanxi Institute of Meteorological Sciences,Taiyuan 030002,China;Yangquan Ecological Environment Monitoring Center,Yangquan 045000,China)

机构地区：[1]山西省阳泉市气象局,阳泉045000 [2]山西省气象科学研究所,太原030002 [3]山西省阳泉市生态环境监测中心,阳泉045000

出　　处：《环境科学》2024年第7期3858-3869,共12页Environmental Science

摘　　要：利用2020~2022年阳泉市的PM_(2.5)监测数据、NCEP数据及对应时刻天气形势分析的气象资料,采用HYSPLIT4后向轨迹模式,引入多站潜在源贡献因子分析法(MS-PSCF)和轨迹密度分析法(TDA),对阳泉市PM_(2.5)传输通道和潜在源区分区域、分级别研究.结果表明:(1)阳泉市PM_(2.5)污染主要集中在阳泉和平定,盂县相对较轻,阳泉和平定的不同污染等级天数占比及PM_(2.5)浓度的平均值和最高值均要明显比盂县高,PM_(2.5)分布特征与本地特殊地形密切相关.(2)小风天气下不同污染等级PM_(2.5)污染次数最多、PM_(2.5)浓度最高;东西向区域输送对阳泉和平定PM_(2.5)污染次数和PM_(2.5)浓度影响明显,且偏东风贡献显著;盂县中度以上天气以本地污染源影响为主.(3)中度以上污染天气生成维持的地面形势主要有4种,暖低压型(22%)、高压前部(底部)型(54%)、高压后部型(14%)和均压场型(10%),高压前部(底部)型是造成PM_(2.5)浓度升高的主要地面形势;高空形势主要有2种,平直西风气流型(78%)和西北气流型(22%),平直西风气流型是造成PM_(2.5)浓度升高的主要高空形势.(4)MS-PSCF和TDA分析法得出的PM_(2.5)不同污染等级的传输通道和潜在源区结果具有一致性,PM_(2.5)主要传输通道为东北、东南和西北通道,东北和东南通道为短距离传输,是造成PM_(2.5)浓度增加的主要路径,西北通道与西北沙尘传输通道一致,属于长距离传输;PM_(2.5)主要的污染潜在源区位于河北中西部与东南部、河南东北部及其与山东西南部交界处、山西东南部.Based on the PM_(2.5) monitoring data,NCEP data,and the meteorological data of the weather situation analysis at the corresponding time in Yangquan City from 2020 to 2022,using the HYSPLIT4 backward trajectory model,multi-station potential source contribution factor analysis(MS-PSCF)and trajectory density analysis(TDA)were introduced to study the differentiation and classification of PM_(2.5) transport channels and potential sources in Yangquan City.The results showed that:①The PM_(2.5) pollution in Yangquan was mainly concentrated in Yangquan and Pingding,whereas the pollution in Yuxian was relatively light.The proportion of days with different pollution levels and the average and maximum values of PM_(2.5) concentration in Yangquan and Pingding were significantly higher than those in Yuxian,and the distribution characteristics of PM_(2.5) were closely related to the local special terrain.②The amount of PM_(2.5) pollution and the concentration of PM_(2.5) in different pollution levels were the highest in light wind weather.The influence of east-west regional transport on PM_(2.5) pollution times and PM_(2.5) concentration of Yangquan and Pingding was obvious,and the contribution of east wind was significant.The influence of local pollution sources was the main factor in the moderate pollution weather in Yuxian County.③There were four main ground conditions for the generation and maintenance of moderate or above pollution weather:warm low pressure type(22%),high pressure front(bottom)type(54%),high pressure back type(14%),and pressure equalization field(10%).High pressure front(bottom)type was the main ground situation causing the increase in PM_(2.5) concentration.There were two types of upper air conditions,namely,flat westerly flow type(78%)and northwest flow type(22%).The upper westerly flow type was the main upper air condition that caused the increase in PM_(2.5) concentration.④The results of transport channels and potential source areas of PM_(2.5) with different pollution levels obtained by MS-PSC

关 键 词：不同污染等级 PM_(2.5) 多站潜在源贡献因子分析法(MS-PSCF) 轨迹密度分析法(TDA) 天气形势特征 

分 类 号：X513[环境科学与工程—环境工程]