| 郑州市臭氧污染变化特征、气象影响及输送源分析 |
| 摘要点击 3410 全文点击 930 投稿时间：2020-06-19 修订日期：2020-08-21 |
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| 中文关键词 臭氧(O3) 郑州 氮氧化物(NOx) 时空变化 气象影响 潜在源区 |
| 英文关键词 ozone(O3) Zhengzhou nitrogen oxides(NOx) temporal-spatial characteristics meteorological influences source identification |
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| 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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