| 摘要: |
| 通过分析2018—2022年邢台市近地面臭氧（O3） 逐时监测数据、同期气象观测数据和卫星遥感资料，对邢台市近地面O3污染变化特征及其与气象因素的关系、O3生成敏感性进行了研究。结果表明，2018—2022年邢台市O3日最大8 h质量浓度第90百分位数值［ρ（O3-8h-90 per）］呈波动下降趋势，年均下降4.24 μg/m3；ρ（O3）季节均值变化表现为夏季＞春季＞秋季＞冬季，6月达到全年峰值，12月达到全年谷值。ρ（O3）日变化呈明显的“单峰型”结构，最低值集中在 06：00—07：00，在15：00—16：00达到峰值。ρ（O3）小时值与气温呈正相关，当气温＞20℃时，随着气温上升，O3小时超标率呈迅速上升趋势；当相对湿度在40%～50%时，O3小时超标率达到最大，为6.02%；东南风向时，O3小时超标率最高，其次为东风、南风。卫星遥感监测数据显示，2019—2022年4—9月邢台市对流层NO2柱浓度年均下降0.24×10-5 mol/m2，城区、北部和南部传输通道县呈下降趋势，西部和中东部地区呈上升趋势；对流层甲醛（HCHO）柱浓度整体呈下降趋势，年均下降1.12×10-5 mol/m2。邢台市挥发性有机物（VOCs）控制区主要集中在城区、南部的沙河市和北部的内丘县、临城县部分区域，其他地区为VOCs和氮氧化物（NOX）协同控制区。 |
| 关键词: 臭氧污染 变化趋势 气象因素 敏感性分析 |
| DOI：DOI：10.3969/j.issn.1674-6732.2024.06.015 |
| 分类号:X515 |
| 基金项目:邢台市市级科技计划项目（2023ZC321） |
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| Characteristics and Sensitivity Analysis of Ozone Pollution in Xingtai from 2018 to 2022 |
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LI Huijie1， DONG Shihong1*， YAN Shuailei1,2， HU Shaoqian1
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1.Xingtai Ecological Environmental Monitoring Center， Xingtai， Hebei 054001， China；2.Department of Ecology and Environment of Hebei Province， Shijiazhuang， Hebei 050051， China
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| Abstract: |
| By analyzing the hourly observation data of ozone（O3） near the ground in Xingtai from 2018 to 2022， the meteorological data and satellite remote sensing data of the same period， the characteristics of O3 pollution near the ground in Xingtai and its relationship with meteorological factors， as well as the sensitivity of O3 generation， were studied. The results indicated that the value of the 90th percentile of the daily maximum 8-hour O3 mass concentration ［ρ（O3-8h-90 per）］ in Xingtai fluctuated downward from 2018 to 2022， with an average annual decrease of 4.24 μg/m3. Seasonally， the annual average ρ（O3） followed a trend of summer > spring > autumn > winter， peaking in June and reaching its nadir in December. The diurnal variation of ρ（O3） showed an obvious ‘single peak’ structure， with the lowest values concentrated between 06：00 and 07：00 and peaking between 15：00 and 16：00. The hourly ρ（O3） values were positively correlated with air temperature. When the temperature exceeded 20℃， the hourly O3 exceedance rate increased rapidly with rising temperatures. The hourly O3 exceedance rate peaked at 6.02% when the relative humidity ranged from 40% to 50%. Under a southeast wind， the hourly O3 exceedance rate was the highest， followed by easterly and southerly winds. Satellite remote sensing data revealed that the annual mean tropospheric NO2 column concentration in Xingtai decreased by 0.24×10-5 mol/m2·a from April to September during 2019—2022， with a downward trend observed in urban areas， northern and southern transmission corridor counties， while an upward trend was noted in western and central eastern regions. The tropospheric formaldehyde（HCHO） column concentration showed an overall downward trend， decreasing by 1.12×10-5 mol/m2 annually. In Xingtai， the volatile organic compounds（VOCs） control areas were primarily concentrated in urban areas， Shahe in the south and some areas of Neiqiu and Lincheng in the north， while other regions were designated as VOCs and nitrogen oxides（NOX） collaborative control areas. |
| Key words: Ozone pollution Change trend Meteorological factors Sensitivity analysis |
