Quantitative Relationship between Near-Surface Ozone and Air Temperature over Beijing Area in Summer
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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O3污染特征. 结果表明:①各站点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mO3-T较低,低至5.2 μg/(m3·℃);近郊区点与城区点的mO3-T相当. ③总体看,北京市mO3-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O3污染水平可能与该时期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) using the data from May to September from 2018 to 2020, and analyzed and compared the differences of mO3-T and ozone pollution characteristics of different types of sites. The results showed that: (1) O3-8 h increased with the increase of Tmax at all sites, and the trend was most obvious in the temperature range of 24-36 ℃. (2) The highest mO3-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 mO3-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 mO3-T can better reflect the differences in 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:
- O3 /
- air temperature /
- quantitative relationship /
- weekend effect /
- Beijing
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表 1 北京市空气质量监测站点
Table 1. Air quality monitoring station in Beijing
类型 站点名称 城区点 东城东四、东城天坛、西城官园、西城万寿西宫、朝阳奥体中心、朝阳农展馆、海淀万柳、海淀北部新区、丰台花园、丰台云岗、石景山古城 郊区点 近郊区:房山良乡、大兴黄村镇、亦庄开发区、通州新
城、顺义新城、昌平镇、门头沟龙泉镇远郊区:平谷镇、怀柔镇、密云镇、延庆镇 背景点 南部背景点:京东南永乐店、京南榆垡、京西南琉璃河 北部背景点:昌平定陵、京西北八达岭、京东北密云水库、京东东高村 交通点 前门东大街、永定门内大街、西直门北大街、南三环西路、东四环北路 -
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