The Trend Reversal of Dust Aerosol Over East Asia and the North Pacific Ocean Attributed to Large‐Scale Meteorology, Deposition, and Soil Moisture

Guo, Jianping; Xu, Hui; Liu, Lin; Chen, Dandan; Peng, Yiran; Yim, Steve Hung Lam; Yang, Yibo; Li, Jian; Zhao, Chun; Zhai, Panmao

doi:10.1029/2019jd030654

Cited by 28 publications

(20 citation statements)

References 105 publications

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“…High acid deposition may cause soil acidification and eutrophication, which are particularly harmful in pH-sensitive areas such as forest and savanna. Despite the fact that N deposition may increase soil N availability and hence photosynthetic capacity and plant growth in an environment with a low N availability (Bai et al, 2010;Fan et al, 2007;Xia et al, 2009), excessive N would suppress or damage plant growth (Fang et al, 2009;Guo et al, 2014;Lu et al, 2009;Mo et al, 2008;Xu et al, 2009;Yang et al, 2009) and also reduce biodiversity (Bai et al, 2010;Lu et al, 2010;Xu et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Air quality and acid deposition impacts of local emissions and transboundary air pollution in Japan and South Korea

Yim

Shapiro

et al. 2019

Atmos. Chem. Phys.

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Abstract. Numerous studies have reported that ambient air pollution, which has both local and long-range sources, causes adverse impacts on the environment and human health. Previous studies have investigated the impacts of transboundary air pollution (TAP) in East Asia, albeit primarily through analyses of episodic events. In addition, it is useful to better understand the spatiotemporal variations in TAP and the resultant impact on the environment and human health. This study aimed at assessing and quantifying the air quality impacts in Japan and South Korea due to local emissions and TAP from sources in East Asia - one of the most polluted regions in the world. We applied state-of-the-science atmospheric models to simulate air quality in East Asia and then analyzed the air quality and acid deposition impacts of both local emissions and TAP sources in Japan and South Korea. Our results show that ∼ 30 % of the annual average ambient PM2.5 concentrations in Japan and South Korea in 2010 were contributed to by local emissions within each country, while the remaining ∼ 70 % were contributed to by TAP from other countries in the region. More detailed analyses also revealed that the local contribution was higher in the metropolises of Japan (∼ 40 %–79 %) and South Korea (∼ 31 %–55 %) and that minimal seasonal variations in surface PM2.5 occurred in Japan, whereas there was a relatively large variation in South Korea in the winter. Further, among all five studied anthropogenic emission sectors of China, the industrial sector represented the greatest contributor to annual surface PM2.5 concentrations in Japan and South Korea, followed by the residential and power generation sectors. Results also show that TAP's impact on acid deposition (SO42- and NO3-) was larger than TAP's impact on PM2.5 concentrations (accounting for over 80 % of the total deposition), and that seasonal variations in acid deposition were similar for both Japan and South Korea (i.e., higher in both the winter and summer). Finally, wet deposition had a greater impact on mixed forests in Japan and savannas in South Korea. Given these significant impacts of TAP in the region, it is paramount that cross-national efforts should be taken to mitigate air pollution problems across East Asia.

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Section: Discussionmentioning

confidence: 99%

Air quality and acid deposition impacts of local emissions and transboundary air pollution in Japan and South Korea

Yim

Shapiro

et al. 2019

Atmos. Chem. Phys.

Self Cite

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“…Recently, many researchers investigated how much of the recent decreased PM 2.5 concentrations could be attributed to the contribution from emission reduction compared to the effects of atmospheric elements. The studies were carried out to evaluate the relative effects of emission reduction and meteorological conditions on the recent decrease in PM 2.5 con-centrations (Ding et al, 2019;Guo et al, 2019;Zhao et al, 2019a). Based on a multiple linear regression model, 12 % of the decreased PM 2.5 over China is due to favorable meteorological conditions between 2013 and 2018 (Zhai et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Effects of atmospheric circulations on the interannual variation in PM<sub>2.5</sub> concentrations over the Beijing–Tianjin–Hebei region in 2013–2018

Wang

Zhang

2020

Atmos. Chem. Phys.

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Abstract. The Chinese government has made many efforts to mitigate fine particulate matter pollution in recent years by taking strict measures on air pollutant reduction, which has generated the nationwide improvements in air quality since 2013. However, under the stringent air pollution controls, how the wintertime PM2.5 concentration (i.e., the mass concentration of atmospheric particles with diameters less than 2.5 µm) varies and how much the meteorological conditions contribute to the interannual variations in PM2.5 concentrations are still unclear, and these very important for the local government to assess the emission reduction of the previous year and adjust mitigation strategies for the next year. The effects of atmospheric circulation on the interannual variation in wintertime PM2.5 concentrations over the Beijing–Tianjin–Hebei (BTH) region in the period of 2013–2018 are evaluated in this study. Generally, the transport of clean and dry air masses and an unstable boundary layer in combination with the effective near-surface horizontal divergence or pumping action at the top of the boundary layer benefits the horizontal or vertical diffusion of surface air pollutants. Instead, the co-occurrence of a stable boundary layer, frequent air stagnation, positive water vapor advection and deep near-surface horizontal convergence exacerbate the wintertime air pollution. Favorable circulation conditions lasting for 2–4 d are beneficial for the diffusion of air pollutants, and 3–7 d of unfavorable circulation events exacerbates the accumulation of air pollutants. The occurrence frequency of favorable circulation events is consistent with the interannual variation in seasonal mean PM2.5 concentrations. There is better diffusion ability in the winters of 2014 and 2017 than in other years. A 59.9 % observed decrease in PM2.5 concentrations in 2017 over the BTH region could be attributed to the improvement in atmospheric diffusion conditions. It is essential to exclude the contribution of meteorological conditions to the variation in interannual air pollutants when making a quantitative evaluation of emission reduction measurements.

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“…elements. The studies have been carried out to evaluate the relative effects of emission reduction and meteorological conditions on the recent decrease in PM2.5 concentrations (Ding et al, 2019;Guo et al, 2019;He et al, 2018;Zhang et al, 2019c;Zhao et al, 2019a). Based on a multiple linear regression model, 12% of the decreased PM2.5 over China is due to favorable meteorological conditions between 2013 and 2018 (Zhai et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Effects of atmospheric circulations on the interannual variation in PM<sub>2.5</sub> concentrations over the Beijing-Tianjin-Hebei region in 2013–2018

Wang¹,

Zhang²

2020

Preprint

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Abstract. The Chinese government has made many efforts to mitigate fine particulate matter (PM2.5) pollution in recent years by taking strict measures on air pollutants reduction, which has generated the nationwide improvements in air quality since 2013. However, under the stringent air pollution controls, how PM2.5 concentration varies and how much the meteorological conditions contribute to the interannual variations in PM2.5 concentrations are still unclear, which is very important for the local government to assess the emission reduction of previous year and adjust mitigation strategies of next year. The effects of atmospheric circulation on the interannual variation in wintertime PM2.5 concentrations over the Beijing-Tianjin-Hebei (BTH) region in the period of 2013–2018 are evaluated in this study. Generally, the transport of clean and dry air masses and unstable boundary layer working with the effective near-surface horizontal divergence or pumping action at the top of the boundary layer benefit for the horizontal or vertical diffusion of surface air pollutants. Instead, the co-occurrence of a stable boundary layer, frequent air stagnation, positive water vapor advection and deep near-surface horizontal convergence exacerbate the air pollution. Favorable circulation conditions lasting for 2~4 days are beneficial for the diffusion of air pollutants, and 3~7 days of unfavorable circulation events exacerbate the accumulation of air pollutants. The occurrence frequency of favorable circulation events is consistent with the interannual variation in seasonal mean PM2.5 concentrations. There is better diffusion ability in the winters of 2014 and 2017 than in other years. A 76.5 % of the observed decrease in PM2.5 concentrations in 2017 over the BTH region could be attributed to the improvement in atmospheric diffusion conditions. It is essential to exclude the contribution of meteorological conditions to the variation in interannual air pollutants when making a quantitative evaluation of emission reduction measurements.

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The Trend Reversal of Dust Aerosol Over East Asia and the North Pacific Ocean Attributed to Large‐Scale Meteorology, Deposition, and Soil Moisture

Cited by 28 publications

References 105 publications

Air quality and acid deposition impacts of local emissions and transboundary air pollution in Japan and South Korea

Air quality and acid deposition impacts of local emissions and transboundary air pollution in Japan and South Korea

Effects of atmospheric circulations on the interannual variation in PM<sub>2.5</sub> concentrations over the Beijing–Tianjin–Hebei region in 2013–2018

Effects of atmospheric circulations on the interannual variation in PM<sub>2.5</sub> concentrations over the Beijing-Tianjin-Hebei region in 2013–2018

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The Trend Reversal of Dust Aerosol Over East Asia and the North Pacific Ocean Attributed to Large‐Scale Meteorology, Deposition, and Soil Moisture

Cited by 28 publications

References 105 publications

Air quality and acid deposition impacts of local emissions and transboundary air pollution in Japan and South Korea

Air quality and acid deposition impacts of local emissions and transboundary air pollution in Japan and South Korea

Effects of atmospheric circulations on the interannual variation in PM&lt;sub&gt;2.5&lt;/sub&gt; concentrations over the Beijing–Tianjin–Hebei region in 2013–2018

Effects of atmospheric circulations on the interannual variation in PM&lt;sub&gt;2.5&lt;/sub&gt; concentrations over the Beijing-Tianjin-Hebei region in 2013–2018

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Effects of atmospheric circulations on the interannual variation in PM<sub>2.5</sub> concentrations over the Beijing–Tianjin–Hebei region in 2013–2018

Effects of atmospheric circulations on the interannual variation in PM<sub>2.5</sub> concentrations over the Beijing-Tianjin-Hebei region in 2013–2018