北京市夏季近地层臭氧对气温的量化响应关系
Quantitative Relationship of Near-surface Summertime Ozone to Air Temperature over Beijing area.
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摘要: 为研究不同污染水平下,O3浓度对气温升高的敏感程度,利用2018—2020年5—9月近地层日最大8 h 臭氧浓度(O3-8 h浓度)和日最高地面气温(Tmax)数据,拟合O3-8 h浓度对Tmax变化的响应斜率(mO3-T),据此对比分析不同类型站点mO3-T的差异和臭氧污染特征. 结果表明:①各个站点的O3-8 h浓度均随Tmax升高而增加,在24~36 ℃气温范围内该趋势最明显. ②城区点mO3-T最高,高达10.6 μg/(m3·℃);北部远郊区点和北部背景点较低,低至5.2 μg/(m3·℃);近郊区点与城区点相当. ③总体看,北京市mO3-T较高,与臭氧污染高发地—美国加州南海岸地区20世纪90年代相当,说明目前北京市O3污染水平可能与这时期的加州南海岸地区相近. ④周末效应分析表明,北京市北部远郊区点和北部背景点的周末效应均高于主城区点,用mO3-T表征的周末效应能更显著地体现不同区域间的差异. 研究显示,mO3-T能表征北京市的O3污染特征以及目前O3污染治理水平所处阶段.Abstract: In order to study the sensitivity of O3 concentration to temperature rise under different pollution levels, we fitted the response slope (mO3-T) of the daily maximum 8-h ozone (O3-8 h) to the change of the daily maximum surface air temperature (Tmax), by using the data from May to September from 2018 to 2020, and then we analyzed and compared the difference of mO3-T and ozone pollution characteristics among different types of sites.The results showed that: (1) O3-8 h increases with Tmax increasing at all sites, and the trend is most obvious in the temperature range of 24-36 ℃. (2) The highest mO3-T is at urban sites, which reach 10.6 μg/(m3·℃). The lowest values is in the northern outer suburbs sites and the northern background sites, which are as low as 5.2 μg/(m3·℃). The suburban sites are equivalent to the urban sites. Overall, the level of mO3-T in Beijing is similar to that of the South Coast, California in the 1990s, suggesting that the current level of O3 pollution in Beijing may be similar to that in the South Coast, California at that time. (3) The analysis of the weekend effect shows that the weekend effect of the northern outer suburbs sites and the northern background sites are higher than that of the urban area.The weekend effect represented by mO3-T could better reflect the differences among different regions. In general, mO3-T can represent the characteristics of O3 pollution and the stage of the current O3 pollution control level in Beijing.
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Key words:
- ozone /
- air temperature /
- quantitative relationship /
- weekend effect /
- Beijing
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