Impact of Extreme Meteorological Events on Ozone in the Pearl River Delta, China

Lin, Xia; Yuan, Zibing; Yang, Leifeng; Luo, Huihong; Li, Wenshi

doi:10.4209/aaqr.2019.01.0027

Cited by 32 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tropospheric ozone (O 3 ) serves as a secondary pollutant in ambient air and is detrimental for human health and crop production (Wang et al, 2017;Liu et al, 2018;Mills et al, 2018). Ambient O 3 is produced from its precursors, i.e.…”

Section: Introductionmentioning

confidence: 99%

A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O3 in the Pearl River Delta, China

Wang

Yan

et al. 2021

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. The Pearl River Delta (PRD) region in South China is faced with severe ambient tropospheric ozone (O3) pollution in autumn and summer, which mostly coincides with the occurrence of typhoons above the Northwest Pacific. With increasingly severe O3 pollution in the PRD under the influence of typhoons, it is necessary to gain a comprehensive understanding of the impact of typhoons on O3 transport, production and accumulation for efficient O3 reduction. In this study, we analysed the general influence of typhoons on O3 pollution in the PRD via systematic comparisons of meteorological conditions, O3 processes and sources on O3 pollution days with and without typhoon occurrence (denoted as the typhoon-induced and no-typhoon scenarios, respectively) and also examined the differences in these influences in autumn and summer. The results show that the approach of typhoons was accompanied by higher wind speeds and strengthened downdraughts in autumn, as well as the inflows of more polluted air masses in summer, suggesting favourable O3 transport conditions in the typhoon-induced scenario in both seasons. However, the effect of typhoons on the production and accumulation of O3 were distinct. Typhoons led to reduced cloud cover, and thus stronger solar radiation in autumn, which accelerated O3 production, but the shorter residence time of local air masses was unfavourable for the accumulation of O3 within the PRD. In contrast, in summer, typhoons increased cloud cover, and weakened solar radiation, thus restraining O3 formation, but the growing residence time of local air masses favoured O3 accumulation. The modelling results using the Community Multiscale Air Quality (CMAQ) model for the typical O3 pollution days suggest increasing contributions from the transport processes and sources outside the PRD for O3 pollution, confirming enhanced O3 transport under typhoon influence in both seasons. The results of the process analysis in CMAQ suggest that the chemical process contributed more in autumn but less in summer in the PRD. Since O3 production and accumulation cannot be enhanced at the same time, the proportion of O3 contributed by emissions within the PRD was likely to decrease in both seasons. The difference in the typhoon influence on O3 processes in autumn and summer can be attributed to the seasonal variation of the East Asian monsoon. From the meteorology–process–source perspective, this study revealed the complex influence of typhoons on O3 pollution in the PRD and their seasonal differences. To alleviate O3 pollution under typhoon influence, emission control is needed on a larger scale, rather than only within the PRD.

show abstract

Section: Introductionmentioning

confidence: 99%

A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O3 in the Pearl River Delta, China

Wang

Yan

et al. 2021

Atmos. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…Ozone concentrations are determined by the photochemical reactions of its precursors and by the local meteorological conditions. However, ozone pollution episodes are mainly triggered by weather conditions rather than by sudden increases from emission sources (Ziomas et al, 1995;Giorgi and Meleux, 2007;Lin et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

The impact of peripheral circulation characteristics of typhoon on sustained ozone episodes over the Pearl River Delta region, China

Zhao

Deng

et al. 2021

Preprint

View full text Add to dashboard Cite

Abstract. It is widely reported that the peripheral circulation of typhoon favors for the formation of sustained ozone episodes. However, the process how it impact on the day-to-day ozone pollution levels during the episodes have not been clearly studies, which is crucial for better prediction of the daily ozone variation. In this study, the analysis of ground observation, wind profile data, and model simulation are integrated. By analyzing the wind profile radar observations, we found a weak winds depth deepening (WWDD; vertical depth of the weak winds increased), which is more correlated to the ground-level ozone variation than surface weak wind. Long-term statistical analyses show that the WWDD is a common weather phenomenon that occurs in the peripheral subsidence region of typhoons and was generally accompanied by ozone pollution episodes. WRF-Chem with process analysis simulation show that under the impact of the peripheral subsidence chemical formation (CHEM) and vertical mixing (VMIX) effects are two major contributors to the enhancement of ozone levels, while the advection (ADV) are always negative values. But regarding the daily variability of the daytime ozone levels during the episode, it do not determined by the daily variation of daytime CHEM and VMIX, but that of the ADV term. A detail day-to-day analysis show that weak subsidence associated with typhoon periphery provide the premise for the clear sky and warmer air, which is conducive for the ozone photolysis formation (CHEM) above the ground in planetary boundary layer (PBL) and compensate the ozone through the positive VMIX effects on the ground. The WWDD induced by the peripheral circulation of typhoon system provide the premise for the day-to-day positive contribution of ADV term to ozone enhancement, which play an important role in determining the day-to-day daytime ozone variation. These results indicate the important role of the WWDD in the lower troposphere for the formation of sustained ozone episodes due to the peripheral circulation of the typhoon, which helps to better predict the daily changes of daytime ozone levels.

show abstract

“…Along with the continuous increasing of O3 levels in recent years , O3 has become the primary contributor to the deterioration of air quality in this region (Feng et al, 2019). The occurrence of O3 pollution in the PRD is predominantly related to the influence of typhoons (or tropical cyclones) above the Northwest Pacific (Gao et al, 2018;Deng et al, 2019;Lin et al, 2019). According to , seven out of the nine most severe O3 episodes (regional-mean maximum 8-h average O3 concentrations of > 240 μg/m 3 ) during 2014-2016 coincided with the approach of typhoons.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study to Reveal the Influence of Typhoons on the Transport, Production and Accumulation of O3 in the Pearl River Delta, China

Qu¹,

Wang²,

Yan³

et al. 2021

Preprint

View full text Add to dashboard Cite

Abstract. The Pearl River Delta (PRD) region in South China is faced with severe ambient O3 pollution in autumn and summer, which mostly coincides with the occurrence of typhoons above the Northwest Pacific. With increasingly severe O3 pollution in the PRD under the influence of typhoons, it is necessary to gain a comprehensive understanding of the impact of typhoons on O3 transport, production and accumulation for efficient O3 reduction. In this study, we analysed the general influence of typhoons on O3 pollution in the PRD via systematic comparisons of meteorological conditions, O3 processes and sources on O3 pollution days with and without typhoon occurrence (denoted as the typhoon-induced and no-typhoon scenarios, respectively), and also examined the differences in these influences in autumn and summer. The results show that the approach of typhoons was accompanied by higher wind speeds and strengthened downdrafts in autumn as well as the inflows of more polluted air masses in summer, suggesting favourable O3 transport conditions in the typhoon-induced scenario in both seasons. However, the effect of typhoons on the production and accumulation of O3 were distinct. Typhoons led to reduced cloud cover, and thus stronger solar radiation in autumn, which accelerated O3 production, but the shorter residence time of local air masses was unfavourable for the accumulation of O3 within the PRD. In contrast, in summer, typhoons increased cloud cover, and weakened solar radiation, thus restraining O3 formation, but the growing residence time of local air masses favoured O3 accumulation. The modelling results using the Community Multiscale Air Quality (CMAQ) model for the typical O3 pollution days suggest increasing contributions from the transport processes as well as sources outside the PRD for O3 pollution, confirming enhanced O3 transport under typhoon influence in both seasons. The results of the process analysis in CMAQ suggest that the chemical process contributed more in autumn but less in summer in the PRD. Since O3 production and accumulation cannot be enhanced at the same time, the proportion of O3 contributed by emissions within the PRD was likely to decrease in both seasons. The difference in the typhoon influence on O3 processes in autumn and summer can be attributed to the seasonal variation of the East Asian monsoon. From the meteorology-process-source perspective, this study revealed the complex influence of typhoons on O3 pollution in the PRD and their seasonal differences. To alleviate O3 pollution under typhoon influence, emission control is needed on a larger scale, rather than only within the PRD.

show abstract

Impact of Extreme Meteorological Events on Ozone in the Pearl River Delta, China

Cited by 32 publications

References 0 publications

A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O<sub>3</sub> in the Pearl River Delta, China

A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O<sub>3</sub> in the Pearl River Delta, China

The impact of peripheral circulation characteristics of typhoon on sustained ozone episodes over the Pearl River Delta region, China

A Comparative Study to Reveal the Influence of Typhoons on the Transport, Production and Accumulation of O<sub>3</sub> in the Pearl River Delta, China

Contact Info

Product

Resources

About

Impact of Extreme Meteorological Events on Ozone in the Pearl River Delta, China

Cited by 32 publications

References 0 publications

A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O&lt;sub&gt;3&lt;/sub&gt; in the Pearl River Delta, China

A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O&lt;sub&gt;3&lt;/sub&gt; in the Pearl River Delta, China

The impact of peripheral circulation characteristics of typhoon on sustained ozone episodes over the Pearl River Delta region, China

A Comparative Study to Reveal the Influence of Typhoons on the Transport, Production and Accumulation of O&lt;sub&gt;3&lt;/sub&gt; in the Pearl River Delta, China

Contact Info

Product

Resources

About

A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O<sub>3</sub> in the Pearl River Delta, China

A comparative study to reveal the influence of typhoons on the transport, production and accumulation of O<sub>3</sub> in the Pearl River Delta, China

A Comparative Study to Reveal the Influence of Typhoons on the Transport, Production and Accumulation of O<sub>3</sub> in the Pearl River Delta, China