Wang Xu-Dong, Yin Sha-Sha, Yang Jian, Yuan Ming-Hao, Zhang Rui-Qin, Li Ya-Song, Lu Xuan
College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China.
Huan Jing Ke Xue. 2021 Feb 8;42(2):604-615. doi: 10.13227/j.hjkx.202006197.
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 (O) pollution in Zhengzhou were studied. In addition, the transport pathways and potential source regions of O were investigated. The results show that surface O concentrations at the city station in Zhengzhou City increased significantly during the period 2014-2018 (<0.05) with a growth rate of 15.50 μg·(m·a), and the timespan of exceeding pollutant standards was extended. The monthly O variations showed an "M" pattern with the seasonal maximum in summer. The diurnal O 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). At the urban station, the exceedance probability of O concentrations was relative high when hourly temperature () exceeded 23℃, relative humidity (RH) was less than 65%, wind speed (WS) ranged 2.0-4.0 m·s, and wind direction was southeast or northeast. Based on the multivariate linear fitting of impact factors on O, the main controlling factors at the city and industrial sites were also identified as and RH compared to and WS at the traffic and suburb sites. Back trajectory analysis and potential sources of O 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 O concentrations observed in summer were mainly affected by local photochemical formation and regional transport from Hebei, Shandong, and Anhui Provinces.
基于空气质量和气象参数的在线监测数据，研究了郑州市地面臭氧（O）污染的长期变化、空间差异及气象影响因素。此外，还调查了O的传输路径和潜在源区。结果表明，2014—2018年郑州市城区站点地面O浓度显著增加（<0.05），增长率为15.50 μg·(m·a)，污染物超标时长有所延长。O的月变化呈“M”型，夏季出现季节性最大值。O的日变化呈“单峰”型，日浓度峰值出现在15:00—16:00，而农村站点的日峰值相对较高（130.94 μg·m）。在城区站点，当小时气温（）超过23℃、相对湿度（RH）小于65%、风速（WS）为2.0—4.0 m·s且风向为东南或东北时，O浓度超标概率相对较高。基于对O影响因素的多元线性拟合，还确定了城区和工业站点的主要控制因素为和RH，而交通和郊区站点的主要控制因素为和WS。不同季节O的后向轨迹分析和潜在源区存在显著差异，春季和夏季的主要传输轨迹是来自南部和东北部的短距离、缓慢移动气流；秋季和冬季的特征是来自西北部的长距离、快速移动气流。夏季观测到的高O浓度主要受当地光化学形成以及来自河北、山东和安徽等省份的区域传输影响。
