| 不同传输通道下珠江三角洲臭氧与前体物非线性响应关系 |
| 摘要点击 1969 全文点击 895 投稿时间：2021-04-15 修订日期：2021-06-05 |
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| 中文关键词 珠江三角洲(PRD) 臭氧污染 传输通道 臭氧生成敏感性 来源解析 |
| 英文关键词 Pearl River Delta (PRD) ozone pollution transmission channels ozone sensitivity source apportionment |
| 作者 | 单位 | E-mail | | 伍永康 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 510443 | wuyongkang1010@stu2019.jnu.edu.cn | | 陈伟华 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 510443 | chenwh26@163.com | | 颜丰华 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 510443 | | | 毛敬英 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 510443 | | | 袁斌 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 510443 | | | 王伟文 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 510443 | | | 王雪梅 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 510443 | |
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| 中文摘要 |
| 高度城市化的珠三角地区臭氧污染频发，臭氧污染的非线性、区域性以及气象过程影响使臭氧精确防控面临巨大挑战.本研究利用臭氧源解析技术OSAT，分析不同传输通道下珠三角臭氧敏感区分布差异，量化城市间的臭氧传输贡献，并通过敏感性试验，探讨珠三角及典型城市的臭氧污染控制策略.结果表明，静风条件下，VOCs敏感区集中在珠三角中部城市群区域，NOx敏感区分布在外围郊区地带；东北风盛行时，珠三角下风向转变为VOCs敏感区，上风向为NOx敏感区；东南风盛行时，VOCs敏感区沿东南至西北方向呈带状分布，两边呈NOx敏感.城际传输方面，在东南和东北方向的传输通道影响下，下风向城市臭氧污染受上风向传输贡献明显（41%~87%），静风时各城市以本地贡献为主（60%~87%）.敏感性试验结果表明，当对应臭氧敏感区分别削减30%的VOCs和NOx时能使珠三角臭氧下降面积最大（20%~36%），而单独削减30% VOCs时能使臭氧浓度降幅最大（9%~18%），但下降范围局限于VOCs敏感区.对典型城市江门而言，静风和东南风条件下对应敏感区削减VOCs和NOx时达标面积增加最大（11%和8%）.而东北风条件下，单独削减VOCs更能有效控制污染，达标面积增加140%. |
| 英文摘要 |
| With the rapid development of urbanization, ozone (O3) pollution is an ongoing occurrence in the Pearl River Delta (PRD) region in China. The effective control of O3 pollution is a great challenge owing to the nonlinear relationship between O3 and precursor emissions and the effect of meteorological conditions. Based on the regional air quality model CAMx-OSAT (ozone source apportionment technology), O3 formation regimes were determined, and inter-city transportation across PRD was quantified under different transmission channels. The results showed that spatial differences were observed for the O3 formation regimes under different transmission channels. The VOCs-sensitive regime was mainly located in the central areas of the PRD region, and the NOx-sensitive regime was distributed in the suburban areas of the PRD regions under calm wind conditions. When the northeast wind was prevailing, the polluted air mass of the urban agglomeration was transmitted southwesterly downward, resulting in the downwind areas being transformed to VOCs-sensitive; the upwind areas were still NOx-sensitive. Under the southeast wind, the VOCs-sensitive regime had a banding distribution along the southeast-northwest direction, and the remaining areas were NOx-sensitive. With the influence of transmission channels, downwind cities were significantly affected by the transmission of upwind urban agglomerations (41%-87%), whereas the local formation was the main contributor under the calm wind conditions (60%-87%). To explore the relationship between O3 and precursor emissions, a series of sensitivity tests were designed. The results showed that maximized areas (20%-36%) with reductions in O3 can be achieved by reducing VOCs and NOx in the corresponding sensitive regimes, and the maximized level with the reduction in O3 can be fulfilled by reducing VOCs in the VOCs-sensitive regime. For the typical city Jiangmen, the area that met the standard increased the most under the calm wind (11%) and southeast wind (8%) conditions when VOCs and NOx were reduced in the corresponding sensitive regimes. Additionally, under northeast wind conditions, reducing VOCs in the VOCs-sensitive regime can more effectively control O3, as the area up to the standard increased by 140%. |
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