中文关键词臭氧(O₃)社区多尺度空气质量模型(CMAQ)污染特征过程分析乌海 英文关键词ozone(O₃)community multiscale air quality model(CMAQ)pollution characteristicsprocesses analysisWuhai

作者	单位	E-mail
张瑞欣	兰州大学大气科学学院, 半干旱气候变化教育部重点实验室, 兰州 730000	zhangrx18@lzu.edu.cn
陈强	兰州大学大气科学学院, 半干旱气候变化教育部重点实验室, 兰州 730000	chenqqh@lzu.edu.cn
夏佳琦	兰州大学大气科学学院, 半干旱气候变化教育部重点实验室, 兰州 730000
刘晓	兰州大学大气科学学院, 半干旱气候变化教育部重点实验室, 兰州 730000
郭文凯	兰州大学大气科学学院, 半干旱气候变化教育部重点实验室, 兰州 730000
李光耀	兰州大学大气科学学院, 半干旱气候变化教育部重点实验室, 兰州 730000
陈梅	兰州交通大学电子与信息工程学院, 兰州 730070

中文摘要 乌海市地形复杂，周边工业园区分布密集，近年来夏季O₃污染问题突出，且污染特征与形成机制尚不明确，分析乌海市O₃变化特征，探究O₃污染形成机制对该区域大气污染防治具有重要意义.本文在分析乌海市2018年6~8月3次持续O₃污染过程特征的基础上，利用WRF-CMAQ模式系统进行模拟并根据过程分析输出结果对污染的成因进行了深入分析，探讨了区域输送和局地光化学反应对乌海市O₃的影响.结果表明，乌海市夏季O₃呈现"单峰"的日变化特征，近地面O₃与向下短波辐射和气温显著呈正相关，与相对湿度呈负相关；空间分布上，乌海市3个工业园区白天和夜间均为O₃低值区，乌海西南部宁夏石嘴山地区、乌海城区和西北部乌兰布和沙漠地区白天为O₃高值区；过程分析结果表明，输送和化学过程及其相对大小对乌海市O₃有决定性影响，6月和7月的污染过程中局地光化学反应和输送共同导致O₃显著升高，且化学过程的影响是输送的两倍左右，8月O₃的升高主要为输送作用的贡献；进一步对输送作用进行分解可知偏南和西北方向的输送对O₃的升高有较大贡献，结合前体物的排放，可能的传输来源为宁夏银川、石嘴山及巴彦淖尔等区域，因此，乌海市应在控制本地排放的基础上，加强区域联防联控，减少区域传输对O₃的影响. 英文摘要 In recent years, summer O₃ pollution has become more severe in Wuhai, where the terrain is complex and industrial parks are densely distributed. However, the characteristics and formation mechanisms of this pollution have not yet been investigated and remain unclear. Analyzing the variation and formation mechanisms of O₃ is crucial to the prevention and control of air pollution in this region. By analyzing characteristics and using a WRF-CMAQ model to simulate three O₃ pollution periods in Wuhai from June to August 2018, this study explored the causes of O₃ pollution based on in-depth process analysis, and the effects of regional transportation and local photochemical reaction on O₃ were also discussed. The diurnal variation of ozone exhibited a single-peak distribution, and near-surface O₃ was positively correlated with short-wave radiation and temperature, and negatively correlated with relative humidity. The areas of Shizuishan in Ningxia and the Ulanbuhe desert exhibited high O₃ values during the day, while the three industrial parks in Wuhai exhibited low values during both the day and night. Process analysis showed that transportation, chemical processes, and their relative magnitudes had a significant impact on O₃. Local photochemical reactions and transport during the pollution period in June and July led to an obvious increase in O₃, while the impact of chemical processes was about twice as large as that of transport. The increase of O₃ in August was mainly caused by transport. Further decomposition of the transportation effect showed that transportation in the south and northwest directions had a remarkable effects on the increase of O₃. Together with the emission of O₃ precursors, the main sources of transportation were the Yinchuan, Shizuishan, and Bayannaoer regions. Therefore, Wuhai and neighboring cities should strengthen regional joint prevention and control by jointly formulating and implementing control measures for air pollution to reduce the impact of regional transmission on O₃.

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