中文关键词PM_2.5层次聚类后向轨迹潜在源贡献长三角(YRD) 英文关键词PM_2.5hierarchical clusteringbackward trajectorypotential source contributionYangtze River Delta (YRD)

作者	单位	E-mail
李瑞	东华大学环境科学与工程学院, 上海 201620 上海大学环境与化学工程学院, 上海 200444	941107@shu.edu.cn
李清	上海大学环境与化学工程学院, 上海 200444
徐健	上海大学环境与化学工程学院, 上海 200444
李亮	蚌埠市生态环境局, 蚌埠 233040
葛朝军	蚌埠市环境监测站, 蚌埠 233040
黄凌	上海大学环境与化学工程学院, 上海 200444
孙登红	蚌埠市环境监察支队, 蚌埠 233040
刘子义	上海大学环境与化学工程学院, 上海 200444
张坤	上海大学环境与化学工程学院, 上海 200444
周国柱	蚌埠市环境监测站, 蚌埠 233040
王杨君	上海大学环境与化学工程学院, 上海 200444
胡子梅	蚌埠市环境监测站, 蚌埠 233040
宋燕西	东华大学环境科学与工程学院, 上海 201620	syx@dhu.edu.cn
陈勇航	东华大学环境科学与工程学院, 上海 201620
李莉	上海大学环境与化学工程学院, 上海 200444	Lily@shu.edu.cn

中文摘要 本文基于空气质量及气象监测数据，运用层次聚类分析法、后向轨迹法、潜在源贡献分析等方法，选取长三角北部地区2018~2019年秋冬季的典型污染过程进行分析，并选取该区域代表性的城市（蚌埠）进行深入分析.结果表明，长三角北部地区大气污染受地面弱气压、高湿、低温和静小风等不利气象条件及传输的影响较大.长三角秋冬季区域性污染具有影响范围广和持续时间长等特征，污染类型主要为区域外传输型与区域内累积型.在EP1和EP2两次污染过程中，长三角北部城市PM_2.5浓度均值分别达到131.6 μg·m^-3和115.4 μg·m^-3，前者污染过程较短，但污染物浓度累积较快造成的污染强度大和范围广.利用PSCF和CWT对PM_2.5潜在源定性和定量分析表明，EP1过程PM_2.5由临沂、徐州、宿迁和连云港等污染轨迹密集区域传输到受体城市蚌埠，CWT值处于80以上，最高可达200以上，区域传输实际浓度值较高；EP2过程PM_2.5浓度受宿迁、宿州和徐州等区域内部邻近城市影响，CWT值处于60以上，最高达160以上，说明研究区域内城市间相互影响较大.因此，秋冬季重污染过程中的跨区域大气污染联动，对于缓解长三角北部区域污染程度尤为重要. 英文摘要 In this study, we analyzed several pollution episodes that occurred in the autumn and winter of 2018-2019 using multiple methods including the hierarchical clustering analysis, backward trajectory, and potential source contribution analysis based on monitored air quality and meteorological data. Bengbu, being a representative city to the north of the Yangtze River Delta (YRD) region and located in a heavily polluted area during these two pollution processes, is the focus of this work. The results indicated that the northern part of the YRD region is affected because of unfavorable meteorological conditions such as weak ground pressure, high humidity, low temperature, low wind speeds, and regional transport. The regional pollution processes over the YRD region in the autumn and winter seasons exhibit characteristics of wide influence and long duration with mainly two types of pollution:regional transport and intra-regional accumulation. During the two selected pollution episodes, the average PM_2.5 concentration in the northern YRD region reached 131.6 μg·m^-3 and 115.4 μg·m^-3, respectively. The former type had a shorter duration but exhibited rapid accumulation of pollutants in a short period of time with greater pollution intensity, wider pollution range, and deeper pollution intrusion. Qualitative and quantitative analysis of the potential sources of PM_2.5 based on PSCF and CWT showed that the PM_2.5 concentration during EP1 was due to transport from cities such as Linyi, Xuzhou, Suqian, and Lianyungang to the pollution trajectory. The CWT value generally exceeded 80 with the highest value near 200. In contrast, EP2 was affected by the neighboring cities such as Suqian, Suzhou, and Xuzhou, and the CWT value was over 60 with the highest approaching 160, indicating that the interaction among cities in the study area is significant. This study shows that cross-regional air pollution control strategies are particularly important for alleviating the pollution situation in the northern part of the YRD region.

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