Hu Feng, Xie Pinhua, Zhu Yu, Zhang Fuhai, Xu Jin, Lv YinSheng, Zhang ZhiDong, Zheng Jiangyi, Zhang Qiang, Li Youtao, Tian Xin
School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China; Key laboratory of Environmental Optical and Technology, Anhui Institute of optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China; Key laboratory of Environmental Optical and Technology, Anhui Institute of optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China.
Sci Total Environ. 2024 Nov 1;949:175048. doi: 10.1016/j.scitotenv.2024.175048. Epub 2024 Jul 27.
High-concentration ozone pollution pose threats to ecosystems and human health. However, there is limited research on the impact of the alternating evolution of synoptic weather patterns (SWPs) on the multi-scale transport processes and sources of ozone. From June 14 to 18, 2018, a rare consecutive ozone pollution plagued in Hefei and broader Yangtze River Delta region (YRD). This study investigates the meteorological factors and sources using in-situ observational data and WRF-Chem model simulations. Analysis reveals a northeastern low-pressure system moving from north to south generated a cold front. This moving cold front facilitated the vertical transport of warm air masses carrying high-concentration ozone originating from North China. Subsequently, Ozone-rich air masses (ORMs) were transported over the YRD, influenced by the eastward movement of the Mongolian high-pressure system. Based on WRF-Chem model with NO tagging mechanisms and WRF-FLEXPART backward simulations, it is confirmed that a notable atmospheric transport originated from North China region (NCR) to Hefei, especially on June 15. As the Mongolian high-pressure weakens and shifts east-southward, it carried ORMs generated by NO emissions from the YRD, accumulating over the sea within the range of 120°E to 126°E and 25°N to 30°N. Both WRF-chem model results and TRopospheric Ozone and Precursors from Earth System Sounding (TROPESS) Chemistry Reanalysis dataset Version 2 (TCR-2) revealed the existence of ORMs in this geographic range. Subsequently, the ORMs carried out to sea by the weakened high-pressure system were reintroduced inland, influenced by southeast winds brought about by the peripheral circulation of typhoon "Gaemi". In summary, the alternating evolution of SWPs significantly influences multi-scale ozone transport from both the NCR and the YRD regions, making substantial contributions to this prolonged episode. These findings offer valuable insights for improving regional ozone pollution prevention and control mechanisms.
高浓度臭氧污染对生态系统和人类健康构成威胁。然而，关于天气尺度模式（SWP）交替演变对臭氧多尺度传输过程和来源的影响的研究有限。2018年6月14日至18日，合肥及更广泛的长江三角洲地区（YRD）遭受了罕见的连续臭氧污染。本研究利用现场观测数据和WRF-Chem模型模拟来调查气象因素和来源。分析表明，一个从北向南移动的东北低压系统产生了冷锋。这一移动的冷锋促进了携带源自中国北方高浓度臭氧的暖空气团的垂直输送。随后，受蒙古高压系统向东移动的影响，富含臭氧的气团（ORM）被输送到长三角地区上空。基于具有NO标记机制的WRF-Chem模型和WRF-FLEXPART反向模拟，证实了一次显著的大气传输源自中国北方地区（NCR）至合肥，特别是在6月15日。随着蒙古高压减弱并向东南方向移动，它携带了长三角地区NO排放产生的ORM，在东经120°至126°、北纬25°至30°范围内的海域上空积聚。WRF-chem模型结果和地球系统探测的对流层臭氧及前体（TROPESS）化学再分析数据集版本2（TCR-2）均揭示了该地理范围内存在ORM。随后，被减弱的高压系统带到海上的ORM受台风“格美”外围环流带来的东南风影响，再次被引入内陆。总之，SWP的交替演变显著影响了来自NCR和YRD地区的多尺度臭氧传输，对这一持续事件做出了重大贡献。这些发现为改进区域臭氧污染预防和控制机制提供了有价值的见解。
