基于伴随模式研究海南省2019年典型臭氧污染来源
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1.中国海洋大学教育部海洋环境与生态重点实验室/三亚海洋研究院;2.中国海洋大学环境科学与工程学院

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Study of typical ozone pollution sources in Hainan Province in 2019 based on an adjoint model
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1.Key Laboratory of Marine Environmental Science and Ecology,Ministry of Education/Sanya Oceanographic Institution, Ocean University of China, Qingdao/Sanya;2.Key Laboratory of Marine Environmental Science and Ecology,Ministry of Education/Sanya Oceanographic Institution,Ocean University of China,Qingdao/Sanya;3.College of Environmental Science and Engineering,Ocean University of China

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    摘要:

    利用中尺度数值天气预报模式和空气质量模型及其伴随模式(WRF-CMAQ/ADJOINT模式)对海南2019年9月一次持续10 d(9月21—30日)的臭氧(O3)污染事件进行模拟,对O3污染事件进行来源解析,量化不同区域和物种排放源对于O3污染事件的贡献。结果表明,污染事件期间,MDA8-O3(臭氧日最大8小时平均浓度)均值为167 μg·m-3,其中MDA8-O3峰值浓度达到186.1 μg·m-3。WRF-CMAQ/ADJOINT模式能够较好模拟海南此次污染事件的O3浓度变化过程,伴随模式揭示远距离区域传输是此次O3污染的主要来源,其中海南外排放源平均贡献占比85%,本地排放源平均贡献占比15%,海南外排放源的贡献集中在珠三角地区。对VOCs排放物种来源分析,异戊二烯在VOCs排放源中贡献最高,平均贡献占比为51%。此次O3污染事件期间海南主要处于NOx控制区,海口市及其周边区域处于VOCs和NOx的协同控制区。由于远距离区域传输是此次O3污染事件的主要来源,未来海南和珠三角的区域联防联控对于提高海南空气质量具有重要意义。

    Abstract:

    Using the mesoscale numerical weather prediction model and the air quality model along with its adjoint model (WRF-CMAQ/ADJOINT model), a simulation was conducted for a 10-day continuous ozone (O3) pollution event in Hainan Province in September 2019 (from September 21 to 30). The simulation aimed to perform source apportionment for the O3 pollution event, quantifying the contributions of different regions and species emission sources to the O3 pollution event. The results show that during this pollution event, the mean value of MDA8-O3 (ozone daily maximum 8-hour average concentration) was 167 μg·m-3, with the peak concentration of MDA8-O3 reaching 186.1 μg·m-3. The WRF-CMAQ/ADJOINT model showed a good ability to simulate the variation of O3 concentration during this pollution event in Hainan Province. The ADJOINT model indicated that long-distance regional transport was the main source of O3 pollution during this event, with an average contribution of 85% from external emissions and an average contribution of 15% from local emissions. The contribution of external emissions from Hainan Province was concentrated in the Pearl River Delta region. Analyzing the sources of VOCs emitting species, isoprene has the highest contribution among the VOCs emission sources, with an average contribution share of 51%. During the O3 pollution event, the ozone pollution regime in Hainan was mainly controlled by NOx, with only Haikou City in a zone requiring coordinated control of VOCs and NOx. Given that long-distance regional transport was the main source of the O3 pollution event, future joint control between Hainan and the Pearl River Delta region are crucial for improving air quality in Hainan.

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  • 收稿日期:2024-01-26
  • 最后修改日期:2024-04-10
  • 录用日期:2024-05-29
  • 在线发布日期: 2024-05-29
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