| 北京市臭氧污染跳变型特征及影响因素分析 |
| 摘要点击 811 全文点击 172 投稿时间：2023-04-06 修订日期：2023-05-25 |
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| 中文关键词 臭氧污染 跳变 气象要素 轨迹聚类 潜在源区 |
| 英文关键词 ozone pollution jumping characteristics meteorological elements trajectory clustering potential source area |
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| 中文摘要 |
| 基于2016~2022年北京市环境监测和气象观测数据，结合后向轨迹聚类和潜在源区贡献分析北京市臭氧（O3）污染特征、气象影响和潜在源区.结果表明，2016~2022年北京市共发生41次具有跳变特征的O3污染过程，平均为5.9次·a-1，发生时间集中在5~7月，跳变当日（OJD2）较跳变前一日（OJD1）的ρ（O3-8h）平均值偏高78.3%，峰值浓度偏高78.9%，OJD2区域O3浓度高值带呈现由南向北推进的特征.北京市跳变O3污染发生主要原因可归纳为不利气象条件导致的本地积累叠加区域传输影响.跳变型O3污染发生时具有偏南风频率增加、温度上升、气压降低和降水减少的特征，偏南风频率增加为O3及其前体物的传输提供条件，在本地高温作用下快速发生光化学反应，叠加降水较少，综合推高OJD2的O3浓度水平.聚类分析得到6条气团输送路径，OJD2来自偏北方向的气团减少11.2%，来自偏南和偏东方向气团增加6.7%和4.4%，气团以短距离传输为主，偏南和偏东方向对应的O3浓度较高，对北京污染贡献较大.潜在源区分析揭示OJD2的O3污染的主要潜在源区是京津冀中南部和东部，贡献了82.6%污染轨迹.跳变型O3污染区域输送贡献明显，需要加强京津冀区域联防联控． |
| 英文摘要 |
| Based on environmental monitoring data and meteorological observation data from 2016 to 2022 in Beijing, combined with backward trajectory clustering and potential source area contribution analysis, the characteristics, meteorological impacts, and potential source areas of ozone (O3) pollution were analyzed. The results showed that there was a total of 41 O3 pollution processes with jumping characteristics in Beijing from 2016 to 2022, with an average of 5.9 times a year. The occurrence time was concentrated in May to July, and the day of the jump (OJD2) was higher than the day before the jump (OJD1). The average value of ρ(O3-8h) was 78.3% higher, and the peak concentration was 78.9% higher. The high O3 concentration zone in the OJD2 region exhibited a characteristic of advancing from south to north. The main reasons for the occurrence of jumped O3 pollution in Beijing could be summarized as local accumulation caused by unfavorable meteorological conditions and regional transmission impact. The occurrence of jump-type ozone pollution was characterized by an increase in southerly wind frequency, temperature rise, pressure decrease, and precipitation decrease. The increase in southerly wind frequency provided conditions for the transport of O3 and its precursors, and rapid photochemical reactions occurred under local high temperatures, with less superimposed precipitation, comprehensively pushing up the ozone concentration level of OJD2. Six air mass transporting pathways were identified through clustering analysis; the air mass from the direction north of OJD2 decreased by 11.2%, whereas the air mass from the south and east directions increased by 6.7% and 4.4%, respectively, with the air masses mainly transmitting over short distances. The ozone concentration corresponding to the south and east directions was relatively high, making a significant contribution to Beijing's pollution. The analysis of potential source areas revealed that the main potential source areas of OJD2 ozone pollution were the central, southern, and eastern parts of Beijing-Tianjin-Hebei, which contributed 82.6% to the pollution trajectory. There was a significant contribution of regional transport during jump-type ozone pollution, and it is necessary to strengthen joint prevention and control in the Beijing-Tianjin-Hebei Region. |
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