Demonstration of long-term increases in tropospheric O3 levels: Causes and potential impacts

Susaya, Janice; Kim, Ki‐Hyun; Shon, Zang–Ho; Brown, Richard

doi:10.1016/j.chemosphere.2013.04.017

Cited by 24 publications

(14 citation statements)

References 37 publications

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“…In this case, O 3 concentration increases with increasing VOC concentration, but decreases with increasing NOx concentration. Usually, urban sites show relatively low VOC/NOx ratios due to high NO X emission [68]. In addition, O 3 is also generated during the transport of its precursors from urban areas to suburban areas [69,70].…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal Distribution of PM2.5 and O3 and Their Interaction During the Summer and Winter Seasons in Beijing, China

Zhao

Zheng

2018

Sustainability

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This study analyzed the spatiotemporal variations in PM 2.5 and O 3 , and explored their interaction in the summer and winter seasons in Beijing. To this aim, hourly PM 2.5 and O 3 data for 35 air quality monitoring sites were analyzed during the summer and winter of 2016. Results suggested that the highest PM 2.5 concentration and the lowest O 3 concentration were observed at traffic monitoring sites during the two seasons. A statistically significant (p < 0.05) different diurnal variation of PM 2.5 was observed between the summer and winter seasons, with higher concentrations during daytime summer and nighttime winter. Diurnal variations of O 3 concentrations during the two seasons showed a single peak, occurring at 16:00 and 15:00 in summer and winter, respectively. PM 2.5 presented a spatial pattern with higher concentrations in southern Beijing than in northern areas, particularly evident during wintertime. On the contrary, O 3 concentrations presented a decreasing spatial trend from the north to the south, particularly evident during summer. In addition, we found that PM 2.5 concentrations were positively correlated (p < 0.01, r = 0.57) with O 3 concentrations in summer, but negatively correlated (p < 0.01, r = −0.72) with O 3 concentrations in winter.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal Distribution of PM2.5 and O3 and Their Interaction During the Summer and Winter Seasons in Beijing, China

Zhao

Zheng

2018

Sustainability

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“…Evaluation of simulated O 3 production efficiency during the KORUS-AQ campaign: Implications for anthropogenic NO x emissions in Korea decreases in the Seoul Metropolitan Area (SMA), where almost half the population reside in . However, despite the successful reductions of precursor emissions, urban O 3 levels have consistently increased nationwide during the past two decades (Susaya et al, 2013). Therefore, understanding the regional characteristics of photochemical O 3 production based on the ambient VOCs or NO x concentrations is essential to formulate an effective control policy (Liu et al, 1987).…”

Section: Research Articlementioning

confidence: 99%

Evaluation of simulated O3 production efficiency during the KORUS-AQ campaign: Implications for anthropogenic NOx emissions in Korea

Oak

Park

Schroeder

et al. 2019

Elementa: Science of the Anthropocene

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We examine O 3 production and its sensitivity to precursor gases and boundary layer mixing in Korea by using a 3-D global chemistry transport model and extensive observations during the KORea-US cooperative Air Quality field study in Korea, which occurred in May-June 2016. During the campaign, observed aromatic species onboard the NASA DC-8 aircraft, especially toluene, showed high mixing ratios of up to 10 ppbv, emphasizing the importance of aromatic chemistry in O 3 production. To examine the role of VOCs and NO x in O 3 chemistry, we first implement a detailed aromatic chemistry scheme in the model, which reduces the normalized mean bias of simulated O 3 mixing ratios from-26% to-13%. Aromatic chemistry also increases the average net O 3 production in Korea by 37%. Corrections of daytime PBL heights, which are overestimated in the model compared to lidar observations, increase the net O 3 production rate by ~10%. In addition, increasing NO x emissions by 50% in the model shows best performance in reproducing O 3 production characteristics, which implies that NO x emissions are underestimated in the current emissions inventory. Sensitivity tests show that a 30% decrease in anthropogenic NO x emissions in Korea increases the O 3 production efficiency throughout the country, making rural regions ~2 times more efficient in producing O 3 per NO x consumed. Simulated O 3 levels overall decrease in the peninsula except for urban and other industrial areas, with the largest increase (~6 ppbv) in the Seoul Metropolitan Area (SMA). However, with simultaneous reductions in both NO x and VOCs emissions by 30%, O 3 decreases in most of the country, including the SMA. This implies the importance of concurrent emission reductions for both NO x and VOCs in order to effectively reduce O 3 levels in Korea.

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“…and three sites in the marine boundary layer along the west coast of Japan (Rishiri (45 • N), Tappi (41 • N), and Sado (38 • N)), where few sources of pollutants exist nearby, obtained under the monitoring network of EANET (the Acid Deposition Monitoring Network in East Asia), also showed increasing trends in O 3 concentrations at least until the mid-2000s (Tanimoto, 2009;Tanimoto et al, 2009;Parrish et al, 2012). During the last decades, an increasing trend in tropospheric O 3 has also been observed at many locations in East Asia, including Taiwan (Chou et al, 2006;Chang and Lee;Li et al, 2010;Lin et al, 2010), mainland China (Lu and Wang, 2006;Ding et al, 2008;Xu et al, 2008;Wang et al, 2009;Zhang et al, 2014), and South Korea (Susaya et al, 2013;Lee et al, 2014;Seo et al, 2014). The increase rates of O 3 in these East Asian regions significantly vary depending on location and season in the range of about 0.3-3 ppbv yr −1 ; however, the increases are generally larger than the trends in tropospheric O 3 for other regions in the world .…”

Section: Introductionmentioning

confidence: 99%

Long-term change in the source contribution to surface ozone over Japan

et al. 2017

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Abstract. The relative contributions of various source regions to the long-term increasing trend in surface ozone (O 3 ) over Japan were estimated by a series of tracer-tagging simulations using a global chemical transport model. The model simulated the observed increasing trend in surface O 3 , including its seasonal variation and geographical features, in Japan well and demonstrated the relative roles of different source regions in forming this trend. Most of the increasing trend in surface O 3 over Japan (∼ 97 %) that was simulated was explained as the sum of trends in contributions of different regions to photochemical O 3 production. The increasing trend in O 3 produced in China accounted for 36 % of the total increasing trend and those in the other northeast Asian regions (the Korean Peninsula, coastal regions in East Asia, and Japan) each accounted for about 12-15 %. Furthermore, the contributions of O 3 created in the entire free troposphere and in western, southern, and southeastern Asian regions also increased, and their increasing trends accounted for 16 and 7 % of the total trend, respectively. The impact of interannual variations in climate, in methane concentration, and in emission of O 3 precursors from different source regions on the relative contributions of O 3 created in each region estimated above was also investigated. The variation of climate and the increase in methane concentration together caused the increase of photochemical O 3 production in several regions, and represented about 19 % of the total increasing trend in surface O 3 over Japan. The increase in emission of O 3 precursors in China caused an increase of photochemical O 3 production not only in China itself but also in the other northeast Asian regions and accounted for about 46 % of the total increase in surface O 3 over Japan. Similarly, the relative impact of O 3 precursor emission changes in the Korean Peninsula and Japan were estimated as about 16 and 4 % of the total increasing trend, respectively. The O 3 precursor emission change in regions other than northeast Asia caused increases in surface O 3 over Japan mainly through increasing photochemical O 3 production in western, southern, and southeast Asia and the free troposphere and accounted for about 16 % of the total.

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Demonstration of long-term increases in tropospheric O3 levels: Causes and potential impacts

Cited by 24 publications

References 37 publications

Spatiotemporal Distribution of PM2.5 and O3 and Their Interaction During the Summer and Winter Seasons in Beijing, China

Spatiotemporal Distribution of PM2.5 and O3 and Their Interaction During the Summer and Winter Seasons in Beijing, China

Evaluation of simulated O3 production efficiency during the KORUS-AQ campaign: Implications for anthropogenic NOx emissions in Korea

Long-term change in the source contribution to surface ozone over Japan

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