2015-2021年四川盆地近地面O3浓度时空演化及区域传输过程
Spatiotemporal Dynamic Evolution and Regional Transport Process of Surface Ozone Concentration in the Sichuan Basin
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摘要: 近地面O3污染已经成为中国最突出的环境问题之一,特别是在地形相对闭塞的盆地区域更加突出;而盆地地形区O3时空演化、区域传输过程及驱动因素尚未被完全揭示。因此,以典型盆地地形区—四川盆地为研究区,基于长时间尺度(2015—2021年)O3浓度监测数据,采用后向轨迹、时空地理加权回归等模型探讨了O3的时空变化特征、传输路径、潜在源区以及驱动因素的空间分布特征。结果表明:时间分布上,2015—2021年四川盆地O3年平均浓度为143±7 µg/m3,夏季O3平均浓度高于其他季节,而5月的O3污染应重点关注,O3浓度存在明显的昼夜差异。空间格局上,四川盆地O3浓度总体呈现西高东低的分布特征,西部平原地带是核心污染区域。2015—2021年成都市有74.24%的O3由近距离传输供给,远距离平均传输贡献率为25.76%。成都市O3污染的潜在源区由西向东迁移,潜在源区范围以盆地为中心逐渐集聚。GTWR分析结果显示,气温和日照时数的平均回归系数为0.738和0.289,是四川盆地O3的主导气象驱动因子,人口密度(0.412)和人均GDP(0.369)是导致O3浓度升高的主要社会经济因素。研究结果以期为盆地地形区O3污染的区域联防联控提供理论支撑。Abstract: Surface ozone pollution has become one of the most prominent environmental problems in China, especially in the topographically isolated basin areas. However, the spatial and temporal evolution, regional transport processes and driving factors of O3 in the basin topographic region have not been systematically studied and confirmed. In this study, the Sichuan basin was chosen as a typical case site, and real-time ozone monitoring data derived from long time scale monitoring stations were selected for analysis. The integrated trajectory, geographically and temporally weighted regression model were used to explore the spatiotemporal variation characteristics, transport paths, potential source areas and distribution characteristics of driving factors of ozone. The results showed that the annual average O3 concentration in Sichuan Basin from 2015 to 2021 was 143±7 µg/m3, and the average O3 concentration in summer was higher than that in other seasons. The O3 pollution in May should be paid more attention, and there was an significant diurnal difference in O3 concentration. In addition, O3 concentration varied significantly between day and night. In terms of spatial pattern, the O3 concentration in the Sichuan Basin was generally high in the west and low in the east, and the core pollution area was located in the Chengdu plain. From 2015 to 2021, 74.24% of O3 in Chengdu was supplied by short-range transmission, while the average contribution rate of long-distance transmission was 25.76%. The potential source area of O3 pollution in Chengdu moved from west to east, and the potential source area gradually gathered around the basin. The driving factor analysis showed that air temperature (0.747) and sunshine duration (0.289) were the dominant meteorological driving factors for O3 in the Sichuan Basin. Population density(0.412) and per capita GDP (0.369) were the main socio-economic factors leading to the increase of O3 concentration. The findings of this study attempted to provide theoretical support for regional joint prevention and control of O3 pollution in the basin topography area.
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Key words:
- ozone(O3) /
- transport path /
- potential source area /
- driving factors /
- Sichuan Basin
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