| 京津冀及周边地区夏季和初秋气象条件对PM2.5和O3双高影响 |
| 摘要点击 3690 全文点击 688 投稿时间：2023-06-08 修订日期：2023-11-14 |
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| 中文关键词 臭氧（O3） PM2.5 气象要素 天气形势 京津冀及周边地区 |
| 英文关键词 ozone（O3） PM2.5 meteorological elements weather situation Beijing-Tianjin-Hebei and surrounding areas |
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| 中文摘要 |
| 为了解2021年京津冀及周边地区夏季和初秋的PM2.5和O3的双高特征及气象影响,对京津冀及周边地区PM2.5和O3浓度的时空分布特征以及气象条件、副高指数和天气形势进行了分析.结果表明,2021年6 ~ 9月PM2.5浓度和DPO3[O3日最大8 h均值与06：00 O3浓度的差值]与2020年和2022年同期相比都有所降低,浓度高值主要集中在6月；PM2.5浓度和DPO3整体呈现从中部向南北逐渐下降的特征,并具有同步的时空变化特征. PM2.5浓度小时均值呈双峰分布,在07：00 ~ 10：00和22：00 ~ 24：00达到峰值；O3浓度小时值呈相反的变化趋势,在14：00 ~ 16：00达到峰值.高PM2.5浓度和DPO3时近地面气象要素特征表现为气温在24.0 ~ 28.0℃,相对湿度在58.4% ~ 76.3%,风速在1.5 ~ 3 m·s-1.副高指数与DPO3存在滞后相关,当副高离京津冀及周边地区越远且强度越强时,DPO3越高.研究区域PM2.5和O3浓度双高的主要天气形势为近地面低压前部、高压型和锋前型,高空受高压脊控制且副高脊线稳定在21° ~ 28°N. |
| 英文摘要 |
| PM2.5 pollution remains prominent in autumn, whereas O3 pollution gradually manifests in summer. To understand the dual high characteristics and meteorological effects of PM2.5 and O3 in the summer and early autumn of 2021 in the Beijing-Tianjin-Hebei and surrounding areas, the spatiotemporal distribution characteristics of PM2.5 and O3 concentrations, as well as meteorological conditions, subtropical high index, and weather situation in the Beijing-Tianjin-Hebei and surrounding areas were analyzed. The results showed that PM2.5 concentration and DPO3 （O3 daily maximum 8h mean minus O3 concentration at 06：00） from June to September 2021 decreased compared with those in the same period in 2020 and 2022, and high concentrations were mainly occurring in June. The overall PM2.5 concentration and DPO3 showed a gradual decrease from the middle to the north and south, with synchronous spatiotemporal changes. The hourly value of PM2.5 concentration presented a multimodal distribution, reaching the peak at 07：00-10：00 and 22：00-24：00. O3 concentration showed an opposite trend of change with PM2.5 concentration, reaching their peak from 14：00-16：00. When DPO3 and the concentration of PM2.5 were high, the characteristics of near-surface meteorological elements were characterized by temperatures ranging from 24.0-28.0℃, relative humidity concentrated at 58.4%-76.3%, and wind speeds ranging from 1.5-3 m·s-1. There was a high lag correlation between the subtropical high index and DPO3. When the subtropical high was farther and stronger from the Beijing-Tianjin-Hebei and surrounding areas, DPO3 was higher. The major weather patterns with both high PM2.5 and O3 concentrations in the study area were near surface low-pressure front, high-pressure type, and frontal type. The high altitude was controlled by high-pressure ridges, and the subtropical high ridge line was stable between 21°-28°N. |
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