生态环境学报 ›› 2021, Vol. 30 ›› Issue (5): 984-994.DOI: 10.16258/j.cnki.1674-5906.2021.05.011

• 研究论文 • 上一篇    下一篇

珠三角西南部春季臭氧来源与敏感性分析

洪莹莹1(), 陈辰2, 保鸿燕3, 沈劲4,*()   

  1. 1.广东省生态气象中心(珠三角环境气象预报预警中心),广东 广州 510640
    2.佛山市气象局,广东 佛山 526060
    3.清远市气象局,广东 清远 511500
    4.广东省生态环境监测中心,广东 广州 510308
  • 收稿日期:2020-12-19 出版日期:2021-05-18 发布日期:2021-08-06
  • 通讯作者: * 沈劲(1985年生),男,高级工程师,硕士,从事大气污染与大气质量模型。E-mail:15120092912@163.com
  • 作者简介:洪莹莹(1990年生),女,工程师,硕士,从事空气质量数值模拟研究。E-mail:hongyy3@mail2.sysu.edu.cn
  • 基金资助:
    广东省重点领域研发计划项目(2019B110206001);国家重点研发计划项目(2016YFC0201901);广东省气象局科技创新团队项目(GRMCTD202003);广东省基础与应用基础研究基金区域联合基金-青年基金项目(2019A1515110791);广东省气象局面上项目(GRMC2018M23);广东省气象局面上项目(GRMC2018M07)

Sources and Sensitivity Analysis of Ozone in Spring Over the Southwestern Part of Pearl River Delta Region

HONG Yingying1(), CHEN Chen2, BAO Hongyan3, SHEN Jin4,*()   

  1. 1. Guangdong Ecological Meteorology (Pearl River Delta Center for Environmental Meteorology Prediction and Warning), Guangzhou 510640, China
    2. Foshan Meteorology Bureau, Foshan 526060, China
    3. Qingyuan Meteorology Bureau, Qingyuan 511500, China
    4. Guangdong Ecological Environmental Monitoring Center, Guangzhou 510308, China
  • Received:2020-12-19 Online:2021-05-18 Published:2021-08-06

摘要:

随着近年臭氧污染程度的加剧,珠三角春季也出现了较严重的大范围臭氧污染事件。然而,目前对于春季臭氧污染的研究仍较少,深入分析研究春季臭氧污染的气象条件、污染成因及其来源对于臭氧污染防治具有重大的现实意义。2017年4月珠三角西南部出现了多次臭氧中度以上污染,该研究以此为例分析了该时段气象条件与臭氧质量浓度的相关关系,利用HYSPLIT轨迹模型分析西南部地区臭氧污染的气团来源,使用WRF/CAMx模型定量分析了珠三角西南部春季臭氧来源与臭氧生成敏感性。结果表明,春季臭氧质量浓度随日照时长和气温日较差的增加而增加,随相对湿度的增加而减少。当局地风向为偏东时,珠三角西南部臭氧污染最严重。东北和偏东路径的气团输送对高质量浓度臭氧有重要贡献,春季白天天然源的贡献为12%—13%,工业源的贡献为15%—18%,交通源的贡献约为10%。除去背景臭氧后,广州和佛山等珠三角中部城市对江门、中山和珠海的臭氧贡献分别为30%、27%和20%,东莞、惠州和深圳等珠三角东部城市对珠海东面站点的臭氧贡献约为27%,但对珠海西部站点的臭氧贡献仅约为10%。粤北地区的前体物排放对江门和中山的臭氧也有超过10%的贡献,珠三角西南部本地的贡献相对较少,这说明臭氧的区域输送特征明显,每个城市排放的污染物主要影响其下风向的城市。臭氧生成敏感性分析结果表明,春季珠三角西南部臭氧主要在VOCs敏感区中生成。综上,春季臭氧污染治理宜从区域VOCs联防联控的角度进行治理。

关键词: 珠三角, 春季, 臭氧, 来源, 敏感性

Abstract:

As the level of ozone (O3) pollution has intensified in recent years, severe large-scale O3 pollution events in the Pearl River Delta region have also occurred in spring. However, there are still few studies that focus on O3 pollution in spring. In-depth analysis of the meteorological conditions, causes and sources of O3 pollution in spring is of great practical significance for the prevention and control of O3 pollution. In April of 2017, the southwestern part of the Pearl River Delta experienced multiple moderate and severe O3 pollution events. This study first analyzed the correlation between meteorological factors and mass O3 concentrations during this period, then used the HYSPLIT trajectory model to analyze the source of O3 pollution in the southwestern region, and finally employed the WRF/CAMx model to quantitatively analyze source and formation sensitivity of O3 in spring in the southwestern Pearl River Delta. The results show that the O3 concentration in spring increases with the increase in sunshine duration and daily temperature difference, and decreases with the increase in relative humidity. When the local wind direction is easterly, O3 pollution is the most serious in the southwest of the Pearl River Delta. The air mass transportation along the northeast and east routes has an important contribution to high level O3 concentrations. For the daytime in spring, the contributions of natural sources, industrial sources, and traffic sources are 12%-13%, 15%-18% and about 10%, respectively. After removing the impact of background O3, the central Pearl River Delta cities including Guangzhou and Foshan have contributed about 30%, 27% and 20% to the O3 concentrations in Jiangmen, Zhongshan and Zhuhai, respectively. The eastern Pearl River Delta cities including Dongguan, Huizhou, and Shenzhen have contributed 27% to the O3 concentrations in eastern sites of Zhuhai, but contributed only 10% to those at the western sites of Zhuhai. The emission of precursors in northern Guangdong also contributes more than 10% to the O3 in Jiangmen and Zhongshan, and the local contribution is relatively small. These results indicate that the regional transport characteristics of O3 are obvious, and the pollutants emitted by each city mainly affect its downwind cities. The results of O3 formation sensitivity analysis demonstrate that O3 in the southwestern Pearl River Delta in spring is mainly generated in the VOCs sensitive area. In summary, the mitigation of O3 pollution in spring should be achieved from the perspective of joint prevention and control of regional VOCs.

Key words: Pearl River Delta, spring, ozone, source, sensitivity

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