北京市夏季近地层臭氧对气温的量化响应关系

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O₃日最大8 h平均浓度(O₃-8 h浓度)和日最高地面气温(Tmax)数据，拟合O₃-8 h浓度对T_max变化的响应斜率(m O₃-T)，据此对比分析不同类型站点m O₃-T的差异和O₃污染特征.结果表明：(1)各站点O₃-8 h浓度均随T_max升高而增加，在24～36℃气温范围内该趋势最明显.(2)城区点m O₃-T最高，高达10.6μg/(m3·℃)；北部远郊区点和北部背景点m O₃-T较低，低至5.2μg/(m3·℃)；近郊区点与城区点的m O₃-T相当.(3)总体看，北京市m O₃-T较高，与O₃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O...

Quantitative Relationship between Near-Surface Ozone and Air Temperature over Beijing Area in Summer

In order to study the sensitivity of O₃ concentration to temperature rise under different pollution levels, we fitted the response slope (m_O3-T) of the daily maximum 8 h ozone (O₃-8 h) to the change of the daily maximum surface air temperature (T_max) using the data from May to September from 2018 to 2020, and analyzed and compared the differences of m_O3-T and ozone pollution characteristics of different types of sites. The results showed that: (1) O₃-8 h increased with the increase of T_max at all sites, and the trend was most obvious in the temperature range of 24-36 ℃. (2) The highest m_O3-T was at urban sites, reaching 10.6 μg/(m3·℃). The lowest value appeared at the northern outer suburb sites and the northern background sites, which was as low as 5.2 μg/(m3·℃). The suburban sites were equivalent to the urban sites. Overall, the m_O3-T level in Beijing is similar to that of the California south coast in the 1990s, suggesting that the current level of O₃ pollution in Beijing may be similar to that on the California south coast at that time. (3) The analysis of the weekend effect showed that the weekend effect of the northern outer suburban sites and the northern background sites were higher than that of the urban area. The weekend effect represented by m_O3-T can better reflect the differences in different regions. In general, m_O3-T can represent the characteristics of O₃ pollution and the stage of the current O₃ pollution control level in Beijing.