| 2015~2021年陕西关中城市群臭氧污染变化趋势 |
| 摘要点击 3071 全文点击 1043 投稿时间：2022-05-24 修订日期：2022-08-01 |
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| 中文关键词 臭氧(O3) 关中城市群 趋势变化 气象条件 挥发性有机物(VOCs)/氮氧化物(NOx)减排比例 |
| 英文关键词 ozone (O3) Guanzhong urban agglomeration trend change meteorological conditions volatile organic compounds (VOCs)/nitrogen oxides (NOx) emission reduction ratio |
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| 中文摘要 |
| 基于2015~2021年环境监测数据和气象再分析资料，利用Mann-Kendall检验法和Sen斜率法等统计手段揭示了陕西关中城市群臭氧（O3）浓度时空变化特征和年际变化趋势，并从气象、排放源和区域传输等方面分析了趋势形成的原因.结果表明：①2015~2021年，关中城市群O3浓度评价值（MDA8第90百分位数）最高的城市是咸阳市，浓度评价值多年平均值为162 μg·m-3，O3浓度平均值（MDA8年均值）和O3浓度背景值（MDA8第5百分位数）最高的城市是铜川市.②关中城市群O3浓度表现为单峰型日变化特征，并呈现夏季>春季>秋季>冬季的年变化特征.夏季咸阳O3浓度平均值最高，其他季节铜川O3浓度平均值最高.③2015~2021年，陕西关中城市群O3浓度背景值呈现出上升趋势，区域浓度背景值平均上升速率为2.20 μg·（m3·a）-1，但是O3浓度评价值并未表现出有统计显著性的变化趋势.此外，关中城市群O3浓度变化趋势与季节密切相关，其中冬季O3浓度上升趋势显著，其他季节大部分城市O3浓度无明显变化趋势.④关中城市群及周边地区挥发性有机物（VOCs）减排幅度普遍小于氮氧化物（NOx）的不合理减排结构、滴定效应减弱以及区域传输等因素共同作用，导致关中城市群冬季O3浓度升高. |
| 英文摘要 |
| Based on air monitoring data from 2015 to 2021, the study reveals the spatial and temporal variation characteristics of ozone (O3) in the Guanzhong urban agglomeration in Shaanxi Province using the Mann-Kendall test and the Sen slope method, and analyzes the reasons for the variation trends. From 2015 to 2021, the highest O3 evaluation concentration (the 90th percentile of MDA8) in the Guanzhong urban agglomeration occurs in Xianyang city in the central part of the urban agglomeration with a concentration as high as 162 μg·m-3, but the multi-year average MDA8 and O3 background concentration (the 5th percentile of MDA8) occur in Tongchuan city in the northern part of the urban agglomeration. O3 concentrations in the Guanzhong urban agglomeration show a unimodal daily variation, showing an annual variation of summer>spring>autumn>winter. Quarterly averages of MDA8 is highest in Xianyang in summer and in Tongchuan in other seasons. From 2015 to 2021, the background O3 concentration of Guanzhong urban agglomeration in Shaanxi has a significant increasing trend, and the regional average background concentration growth rate is 2.20 μg·(m3·a)-1, but the evaluated concentration does not show a significant change trend. The interannual trends of O3 concentrations are closely related to the seasons. Among them, the increasing trend of O3 concentration in winter is significant, while the increasing trend of O3 concentration in most cities in other seasons is not significant. The combination of unreasonable emission reduction structures for volatile organic compounds (VOCs), which are generally smaller than those for nitrogen oxides (NOx) in the Guanzhong urban agglomeration and surrounding areas, weakened titration effects, and regional transport lead to higher winter O3 concentrations in the Guanzhong urban agglomeration. |
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