Projecting the impacts of atmospheric conditions under climate change on air quality over the Pearl River Delta region

Tong, Cheuk Hei Marcus; Yim, Steve Hung Lam; Rothenberg, Daniel; Wang, Chen; Lin, Chuan-Yao; Chen, Yongqin David; Lau, Ngar Cheung

doi:10.1016/j.atmosenv.2018.08.053

Cited by 37 publications

(15 citation statements)

References 48 publications

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“…In addition to local emissions, transboundary air pollution (TAP) is a major contributor to serious air pollution [14,22]. For example, studies have reported the severe TAP in the Greater Bay Area of China [23][24][25][26][27] and the resultant health impacts [10,28]. However, the understanding of upper atmosphere TAP remains limited.…”

Section: Introductionmentioning

confidence: 99%

Development of a 3D Real-Time Atmospheric Monitoring System (3DREAMS) Using Doppler LiDARs and Applications for Long-Term Analysis and Hot-and-Polluted Episodes

Yim

2020

Remote Sensing

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Heatwaves and air pollution are serious environmental problems that adversely affect human health. While related studies have typically employed ground-level data, the long-term and episodic characteristics of meteorology and air quality at higher altitudes have yet to be fully understood. This study developed a 3-Dimensional Real-timE Atmospheric Monitoring System (3DREAMS) to measure and analyze the vertical profiles of horizontal wind speed and direction, vertical wind velocity as well as aerosol backscatter. The system was applied to Hong Kong, a highly dense city with complex topography, during each season and including hot-and-polluted episodes (HPEs) in 2019. The results reveal that the high spatial wind variability and wind characteristics in the lower atmosphere in Hong Kong can extend upwards by up to 0.66 km, thus highlighting the importance of mountains for the wind environment in the city. Both upslope and downslope winds were observed at one site, whereas downward air motions predominated at another site. The high temperature and high concentration of fine particulate matter during HPEs were caused by a significant reduction in both horizontal and vertical wind speeds that established conditions favorable for heat and air pollutant accumulation, and by the prevailing westerly wind promoting transboundary air pollution. The findings of this study are anticipated to provide valuable insight for weather forecasting and air quality studies. The 3DREAMS will be further developed to monitor upper atmosphere wind and air quality over the Greater Bay Area of China.

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Section: Introductionmentioning

confidence: 99%

Development of a 3D Real-Time Atmospheric Monitoring System (3DREAMS) Using Doppler LiDARs and Applications for Long-Term Analysis and Hot-and-Polluted Episodes

Yim

2020

Remote Sensing

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“…The PRD region is a highly urbanized city cluster, and the distances between its major cities are shorter than 10 km (Shao et al 2006). Scholars have reported transboundary air pollution (TAP) between the cities is a major contributor to the air pollution in the region (Louie et al 2005, Deng et al 2008, Gu and Yim 2016, Luo et al 2018, Tong et al 2018a, 2018b. Wu et al (2013) demonstrated that approximately 8.6% of the PM 2.5 level in Guangzhou was attributable to mobile sources originating in adjacent regions (i.e.…”

Section: Introductionmentioning

confidence: 99%

Impacts of transboundary air pollution and local emissions on PM _2.5 pollution in the Pearl River Delta region of China and the public health, and the policy implications

Hou

Chan

Dong

et al. 2019

Environ. Res. Lett.

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Despite a downward trend in pollutant levels because of a series of emission control policies, the Pearl River Delta (PRD) region continues to suffer from a high number of fine particulate matter (PM 2.5 ) events and the resultant public health impacts. To effectively control PM 2.5 in the region, a comprehensive understanding of source contribution and PM 2.5 responses to various emission species is critical. We applied the Community Multiscale Air Quality Modeling System together with the high-order decoupled direct method, to simulate air quality and PM 2.5 sensitivity and examined PM 2.5 responses to emission species in the PRD region in the four seasons of 2010. We employed a concentration-response function to quantify the resultant number of premature mortalities attributable to outdoor PM 2.5 . We estimated that local and transboundary air pollution (TAP) contributed 27% and 73%, respectively, of the region's PM 2.5 . In absolute terms, the largest impacts from local and TAP occurred in winter. With respect to relative contributions among the different sources, regional TAP (between cities in the region) (R-TAP) and local contributions had the largest effect in summer, whereas superregional TAP (from outside of the region) contributed the most in fall and winter. Outdoor PM 2.5 pollution caused 20 160 (95% confidence interval: 5100-39 310) premature mortalities every year in the PRD region. Averaging among cities, 50%, 20%, and 30% of these deaths were attributable to S-TAP, R-TAP, and local contributions, respectively. Precursor gas emissions (i.e. NH 3 , volatile organic compounds, SO 2 , and NO x ) affect PM 2.5 level in a nonlinear manner; thus, individual pollutant control strategies are less effective for improving PM 2.5 pollution than an integrated strategy. On the basis of our findings, we recommend that controls for multiple emission species should be implemented to control PM 2.5 pollution in the region.

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“…High occurrence of haze events has prompted the Chinese government to launch a series of initiatives to alleviate the PM 2.5 pollution in recent years (Zheng et al ., 2017; Zheng et al ., 2018; Li et al ., 2019). As one of the most prosperous and populated provinces in China, Guangdong's robust economic development has contributed to poor air quality (Chen et al ., 2019; Li and Wang, 2014; Huang et al ., 2018; Tong et al ., 2018).…”

Section: Introductionmentioning

confidence: 99%

Synergetic effect of El Niño‐Southern Oscillation and Indian Ocean Dipole on particulate matter in Guangdong, China

Liu

2021

Intl Journal of Climatology

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The synergetic effect of Indian Ocean Dipole (IOD) and El Niño-Southern Oscillation on the particulate matter (PM 2.5 ) concentration in Guangdong for October-November-December 1980-2016 has been investigated. Results indicate that, during a typical polluted episode, Guangdong is usually under the influence of a high-pressure system behind the cold front, which is characterized by weakened southwesterly, subsidence/divergence, and stable atmospheric conditions. Persistent low values of PM 2.5 are found to prevail during the years when concurrent IOD positive phase and El Niño occur. However, separate occurrence of El Niño and the positive phase of IOD had only marginal effect on PM 2.5 . The remarkable synergetic effect of El Niño and the positive phase of IOD is caused by a significantly strengthened ascending motion associated with anomalous southwesterly, which facilitates the transport of abundant moisture, increasing rainfall and thus suppressing PM 2.5 pollution in

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Projecting the impacts of atmospheric conditions under climate change on air quality over the Pearl River Delta region

Cited by 37 publications

References 48 publications

Development of a 3D Real-Time Atmospheric Monitoring System (3DREAMS) Using Doppler LiDARs and Applications for Long-Term Analysis and Hot-and-Polluted Episodes

Development of a 3D Real-Time Atmospheric Monitoring System (3DREAMS) Using Doppler LiDARs and Applications for Long-Term Analysis and Hot-and-Polluted Episodes

Impacts of transboundary air pollution and local emissions on PM _2.5 pollution in the Pearl River Delta region of China and the public health, and the policy implications

Synergetic effect of El Niño‐Southern Oscillation and Indian Ocean Dipole on particulate matter in Guangdong, China

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Projecting the impacts of atmospheric conditions under climate change on air quality over the Pearl River Delta region

Cited by 37 publications

References 48 publications

Development of a 3D Real-Time Atmospheric Monitoring System (3DREAMS) Using Doppler LiDARs and Applications for Long-Term Analysis and Hot-and-Polluted Episodes

Development of a 3D Real-Time Atmospheric Monitoring System (3DREAMS) Using Doppler LiDARs and Applications for Long-Term Analysis and Hot-and-Polluted Episodes

Impacts of transboundary air pollution and local emissions on PM 2.5 pollution in the Pearl River Delta region of China and the public health, and the policy implications

Synergetic effect of El Niño‐Southern Oscillation and Indian Ocean Dipole on particulate matter in Guangdong, China

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Impacts of transboundary air pollution and local emissions on PM _2.5 pollution in the Pearl River Delta region of China and the public health, and the policy implications