中文关键词臭氧(O₃)郑州氮氧化物(NO_x)时空变化气象影响潜在源区 英文关键词ozone(O₃)Zhengzhounitrogen oxides(NO_x)temporal-spatial characteristicsmeteorological influencessource identification

作者	单位	E-mail
王旭东	郑州大学化学学院, 郑州 450001	1501420043@qq.com
尹沙沙	郑州大学生态与环境学院, 郑州 450001	shashayin@zzu.edu.cn
杨健	郑州大学化学学院, 郑州 450001
袁明浩	河南省郑州生态环境监测中心, 郑州 450007
张瑞芹	郑州大学生态与环境学院, 郑州 450001
李亚松	郑州大学化学学院, 郑州 450001
卢轩	郑州大学化学学院, 郑州 450001

中文摘要 基于环境空气质量和气象在线监测数据，研究了郑州市近地面臭氧（O₃）污染的年际变化、空间差异及气象影响，并分析了O₃传输路径和潜在源区.结果表明，2014~2018年郑州市近地面O₃污染超标时间跨度增加，城区站点O₃日最大8 h滑动平均值（MDA8）第90%分位呈显著上升趋势（P<0.05），增长速率为15.50 μg·（m³·a）^-1；O₃月变化呈"M"型，峰值出现在夏季；日变化呈单峰型，峰值出现在15：00~16：00，农村站点O₃日峰值浓度（130.94 μg·m^-3）最高；气温（T）>23℃、相对湿度（RH）<65%和风速（WS）为2.0~4.0 m·s^-1及风向在东南和东北方向时城市站点易发生高浓度O₃污染.各影响因子和O₃浓度的多元线性回归分析表明，T和RH是城市和工业站点的主控因子，T和WS是城市交通和郊区站点的主控因子；不同季节后向轨迹聚类分析和O₃潜在来源差异明显，春夏季大气传输路径以正南及东北方向近距离慢移速的轨迹为主，秋冬季以西北方向远距离快移速的轨迹为主；夏季高O₃浓度主要受本地生成和河北、山东及安徽等地传输影响. 英文摘要 Based on online monitoring data of air quality and meteorological parameters, the long-term variations, spatial differences, and meteorological influencing factors of ground-level ozone (O₃) pollution in Zhengzhou were studied. In addition, the transport pathways and potential source regions of O₃ were investigated. The results show that surface O₃ concentrations at the city station in Zhengzhou City increased significantly during the period 2014-2018 (P<0.05) with a growth rate of 15.50 μg·(m³·a)^-1, and the timespan of exceeding pollutant standards was extended. The monthly O₃ variations showed an "M" pattern with the seasonal maximum in summer. The diurnal O₃ variations showed a "single-peak" pattern with a diurnal concentrations peak at 15:00-16:00, while the diurnal peak at the rural station was relatively high (130.94 μg·m^-3). At the urban station, the exceedance probability of O₃ concentrations was relative high when hourly temperature (T) exceeded 23℃, relative humidity (RH) was less than 65%, wind speed (WS) ranged 2.0-4.0 m·s^-1, and wind direction was southeast or northeast. Based on the multivariate linear fitting of impact factors on O₃, the main controlling factors at the city and industrial sites were also identified as T and RH compared to T and WS at the traffic and suburb sites. Back trajectory analysis and potential sources of O₃ during different seasons were significantly different, with the dominant transport trajectories during spring and summer being short-distance and slow-moving airflows from the south and northeast; autumn and winter were characterized by long-distance and quick-moving airflows from the northwest. The high O₃ concentrations observed in summer were mainly affected by local photochemical formation and regional transport from Hebei, Shandong, and Anhui Provinces.

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