Origin of regional springtime ozone episodes in the Sichuan Basin, China: Role of synoptic forcing and regional transport

Yang, Xiangdong; Wu, Kai; Lü, Yaqiong; Wang, Shigong; Qiao, Yuhong; Zhang, Xiaoling; Wang, Yurun; Wang, Haolin; Liu, Zhihong; Liu, Yilin; Lei, Yu

doi:10.1016/j.envpol.2021.116845

Cited by 57 publications

(16 citation statements)

References 39 publications

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“…This is partly explained by a low-pressure system (Fig. S4b), which was known for weak diffusion of ozone and precursors and, in turn, accumulation of pollutants (Otero et al 2016;Liu et al 2019;Yang et al 2021). Both the simulated and observed data show that the under favorable meteorological conditions with high temperature, low relative humidity and anticyclone, ozone concentrations increased rapidly within several hours, resulting in the large-scale ozone pollution in eastern China Horizontal transports of ozone from the surrounding areas also contributed to the observed ozone rises.…”

Section: Spatio-temporal Evolutions Of Ozone Pollution and Meteorolog...mentioning

confidence: 99%

“…High ozone episodes in many countries show similar characteristics closely related to active photochemical formations, heat wave, prevailing wind conditions, anticyclone synoptic systems, tropospheric intrusions, and regional transports of air masses containing ozone-rich air from upwind areas (Jin et al 2008;Gao et al 2016;Schnell et al 2016, Kalabokas et a. 2017Pu et al 2017, Shu et al 2019Gong et al 2020;Jaen et al 2021;Yang et al 2021). Ozone pollution episodes in eastern China have been intensively investigated (Gao et al 2016;Li et al 2017;Shu et al 2019;Gong et al 2020;.…”

Section: Introductionmentioning

confidence: 99%

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Local production, downward and regional transport aggravated surface ozone pollution during the historical orange-alert large-scale ozone episode in eastern China

Zhang

Xue

et al. 2022

Environ Chem Lett

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Increasing severe and persistent ozone pollution in China has resulted in serious harm to human health in recent years, yet the precise pollution sources are poorly known because there is few knowledge on large-scale extreme ozone episodes. Here, we studied the formation of the historical orange-alert regional ozone episode in eastern China on 6 June, 2021, by combining process analysis, integrated source apportionment modelling, and chemical and meteorological data. Results show that dur-ing the pollution episode, 94% of cities in eastern China suffered ozone pollution, and 39% had daily maximum 8-h average ozone concentrations higher than 100 ppb. This is explained by favorable local ozone formation and transports provided by the prevailing northwestern winds in the upper air, and by sinking atmospheric motions favoring the persistence of high surface ozone concentrations. During daytime, local photochemical production induced an ozone increase of 0.3-28.4 ppb h −1 and vertical transport induced an ozone increase of 0.4-56.1 ppb h −1 . As a consequence, vertical downward transport of ozone generated in the upper air by photochemical reactions aggravated surface ozone pollution. Surface ozone concentrations include 25.8-53.9% of ozone from local provincial emissions, 0-42.6% of ozone from inter-regional transports from neigh-boring regions, 4.6-23.1% of ozone from outer-regional transport, and 13.6-52.9% of ozone from boundary conditions in the selected cities. Overall, our findings show that favorable meteorological conditions promoted the chemical productions of ozone on the surface and at high altitudes, thus resulting in this heavy ozone pollution. In addition, regional and vertical downward transports of aloft ozone further aggravated the surface ozone pollution, leading to the large-scale extreme ozone pollution episode.

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Section: Spatio-temporal Evolutions Of Ozone Pollution and Meteorolog...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local production, downward and regional transport aggravated surface ozone pollution during the historical orange-alert large-scale ozone episode in eastern China

Zhang

Xue

et al. 2022

Environ Chem Lett

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“…These inconsistencies may correspond to the different climate and topographic conditions, ozone distribution characteristics, demographic compositions, people's lifestyles, and education levels of diverse areas (Li et al, 2018). As the capital city of Sichuan Province, the population of Chengdu exceeded 16.04 million as of June 2018, and the city suffers serious ozone pollution, especially in summer (Yang et al, 2021). The modulatory effects of ambient temperatures on ozone-mortality relationships in this area are still unclear.…”

Section: Introductionmentioning

confidence: 99%

Modification effects of ambient temperature on ozone-mortality relationships in Chengdu, China

Zhang

Tian

Feng

et al. 2022

Environ Sci Pollut Res

Self Cite

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A multitude of epidemiological studies have demonstrated that both ambient temperatures and air pollution are closely related to health outcomes. However, whether temperature has modi cation effects on the association between ozone and health outcomes is still debated. In this study, Three parallel timeseries Poisson generalized additive models (GAMs) were used to examine the effects of modifying ambient temperatures on the association between ozone and mortality (including non-accidental, respiratory, and cardiovascular mortality) in Chengdu, China, from 2014 to 2016. The results con rmed that the ambient high temperatures strongly ampli ed the adverse effects of ozone on human mortality; speci cally, the ozone effects were most pronounced at >28°C. Without temperature strati cation conditions, a 10-µg/m 3 increase in the maximum 8-hour average ozone (O 3−8hmax ) level at lag01 was associated with increases of 0.40% (95% con dence interval [CI]: 0.15%, 0.65%), 0.61% (95%CI: 0.27%, 0.95%) and 0.69% (95%CI: 0.34%, 1.04%) in non-accidental, respiratory, and cardiovascular mortality, respectively. On days during which the temperature exceeded 28°C, a 10-µg/m 3 increase in O 3−8hmax led to increases of 2.22% (95%CI: 1.21%, 3.23%), 2.67% (95%CI: 0.57%, 4.76%), and 4.13% (95%CI: 2.34%, 5.92%) in non-accidental, respiratory, and cardiovascular mortality, respectively. Our ndings validated that high temperature could further aggravate the health risks of O 3−8hmax , thus mitigating ozone exposure will be brought into the limelight especially under the context of changing climate.

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“…Churkina et al found a pronounced effect of vegetation on ground-level ozone in Berlin, Germany, showing that the contribution of BVOCs to ozone could reach 60% during the heatwave in 2006 and 40% on summer hot days in 2014. Therefore, in order to develop effective control strategies for urban air pollution, it is essential to accurately quantify the combined effects of VOC emissions on urban air quality, both from anthropogenic and biogenic sources. − …”

Section: Introductionmentioning

confidence: 99%

Effects of Anthropogenic and Biogenic Volatile Organic Compounds on Los Angeles Air Quality

Guenther

Faiola

2021

Environ. Sci. Technol.

134

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Assessing the role of volatile organic compounds (VOCs) in production of ozone and secondary organic aerosol (SOA) is especially important in light of ongoing policy goals. Here, we estimated the ozone formation potential (OFP) and SOA formation potential (SOAP) of anthropogenic and biogenic VOC emissions to evaluate (1) anthropogenic VOCs and associated sectors that dominate OFP and SOAP and (2) the potential impacts of enhanced biogenic VOCs from urban greening programs on air quality in Los Angeles county. In the present-day scenario, ethylene had the largest OFP followed by m & p-xylene, toluene, propylene, and formaldehyde. The top five contributors to SOAP were toluene, mineral spirits, benzene, heptadecane, and hexadecane. Mobile and solvent sources were the dominant VOC sources for both OFP and SOAP. The potential increases in biogenic VOC emissions due to future urban greening had significant effects on urban air quality that offset the benefits of reducing anthropogenic VOC emissions. This study demonstrates that urban greening programs in Los Angeles county, and likely other cities as well, need to account for both anthropogenic and biogenic VOC contributions to secondary pollution, and greening cities should consider using vegetation types with low VOC emissions to avoid further degradation to urban air quality.

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Origin of regional springtime ozone episodes in the Sichuan Basin, China: Role of synoptic forcing and regional transport

Cited by 57 publications

References 39 publications

Local production, downward and regional transport aggravated surface ozone pollution during the historical orange-alert large-scale ozone episode in eastern China

Local production, downward and regional transport aggravated surface ozone pollution during the historical orange-alert large-scale ozone episode in eastern China

Modification effects of ambient temperature on ozone-mortality relationships in Chengdu, China

Effects of Anthropogenic and Biogenic Volatile Organic Compounds on Los Angeles Air Quality

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