Turnaround of Tropospheric Nitrogen Dioxide Pollution Trends in China, Japan, and South Korea

Irie, Hitoshi; Muto, Takuya; Itahashi, Syuichi; Kurokawa, J.; Uno, Itsushi

doi:10.2151/sola.2016-035

Cited by 55 publications

(45 citation statements)

References 28 publications

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“…2b. Over China, emissions increased from 2001 to 2010, peaked in 2011-2012, and decreased after 2012, consistent with previous findings (e.g., Irie et al, 2016;Krotkov et al, 2016;van der A et al, 2017). Based on the spatial distribution, the NO 2 column above China peaked during the transition from Phase II and III (left panel of Fig.…”

Section: Satellite Observationssupporting

confidence: 90%

“…Recently, satellite observations have been widely used as a proxy for emissions data. The NO 2 column has been used to capture NO x emissions (e.g., Miyazaki et al, 2012;Mijling et al, 2013;Itahashi et al, 2014b;Han et al, 2015;Irie et al, 2016), and the SO 2 column has been used for SO 2 emissions (e.g., Lee et al, 2011;Li et al, 2010) and/or volcanic eruptions (e.g., Brenot et al, 2014). Several studies have indicated the importance of different technologies to control emissions (e.g., Li et al, 2010;Wang et al, 2015;Krotkov et al, 2016;van der A et al, 2017).…”

Section: Satellite Observationsmentioning

confidence: 99%

“…NO x emissions in China have been rising steadily (Kurokawa et al, 2013;Itahashi et al, 2014b), whereas SO 2 emissions in China peaked in [2005][2006] and subsequently declined due to the introduction of flue-gas desulfurization systems in China's 11th Five-Year Plan (2006 (Kurokawa et al, 2013;Itahashi et al, 2012). Recently, it has been reported that NO x emissions in China declined after 2011-2012 (Irie et al, 2016;Xia et al, 2016;Krotkov et al, 2016;van der A et al, 2017). To determine the result of this change, we revisited and updated an analysis of precipitation data in relation to emission variation over East Asia.…”

Section: Introductionmentioning

confidence: 99%

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A 15-year record (2001–2015) of the ratio of nitrate to non-sea-salt sulfate in precipitation over East Asia

et al. 2018

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Section: Satellite Observationssupporting

confidence: 90%

Section: Satellite Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A 15-year record (2001–2015) of the ratio of nitrate to non-sea-salt sulfate in precipitation over East Asia

et al. 2018

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“…Recently, satellite observations have been widely used as a proxy for emissions data. NO 2 column have been used to capture NOx emissions (e.g., Miyazaki et al, 2012;Mijling et al, 2013;Itahashi et al, 2014b;Han et al, 2015;Irie et al, 2016) and SO 2 25 column for SO 2 emissions (e.g., Lee et al, 2011;Li et al, 2010) and/or volcanic eruptions (e.g., Brenot et al, 2014). Several studies have indicated the importance of different technologies to control emissions (e.g., Li et al, 2010;Wang et al, 2015;Krotkov et al, 2016;van der A et al, 2017).…”

Section: Satellite Observations 20mentioning

confidence: 99%

“…NOx emission in China has been rising steadily (Kurokawa et al, 2013;Itahashi et al, 2014b), whereas SO 2 emission in China peaked in [2005][2006] and subsequently declined due to the introduction of flue-gas desulfurization systems in China's 11th Five-Year Plan (2006 (Kurokawa et al, 2013;5 Itahashi et al, 2012a). Recently, it has been reported that NOx emission in China declined after 2011(Irie et al, 2016Xia et al, 2016;Krotkov et al, 2016;van der A et al, 2017). To determine the cause of this change, we revisited and updated the analysis of precipitation observation data in relation to emission variation over East Asia.…”

Section: Introductionmentioning

confidence: 99%

A 15-year record (2001–2015) of the ratio of nitrate to non-seasalt sulfate in precipitation over East Asia

Itahashi¹,

Yumimoto²,

Uno³

et al. 2017

Preprint

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Abstract. Acidifying species in precipitation can cause severe impacts on ecosystem. The chemical concentration of precipitation is directly related to the precipitation amount, so it is partly difficult to identify the long-term variation from precipitation concentration. The ratio of nitrate (NO 3 -) to non-seasalt sulfate (nss-SO 4 2-) concentration in precipitation on an equivalent basis (hereinafter, Ratio) will be a useful index. To identify the long-term record of acidifying species in 15 precipitation over East Asia, where is the highest emission region in the world, we have compiled the ground-based 2-concentration, and hence Ratio in precipitation will be related to these precursors. The anthropogenic NOx and SO 2 emission amount, and NOx/SO 2 emission ratio are analyzed. Further, satellite observations of NO 2 and SO 2 column density to capture the variation in emission was applied. We found that the long-term trend of NO 3 -concentration in precipitation was not related to the variation in NOx emission and the NO 2 column. In comparison, the nss-SO 4 2-concentration in precipitation over China, Korea, and Japan was partly connected to the changes in SO 2 emission from China, but the trends 25were not significant. The long-term trend of Ratio over China, Korea, and Japan were nearly flat during Phase I, increasing significantly during Phase II, and almost flat again during Phase III. These variations of Ratio in East Asia clearly corresponded to the NOx/SO 2 emission ratio and the NO 2 /SO 2 column ratio in China. The first flat trend during Phase I was due to both increases in NOx and SO 2 emissions in China, the significant increasing trend during Phase II was triggered by the increase in NOx emission and decrease in SO 2 emission in China, and the returned flat trend during Phase III was caused 30 by both declines in NOx and SO 2 emissions in China. This suggests that China's emission has a significant impact not only on China but also on downwind precipitation chemistry during the analyzed 15-year period of 2001-2015. In terms of wet depositions, the NO 3 -wet deposition amount over China, Korea, and Japan has not changed dramatically, but the nss-SO 4 2-Atmos. Chem. Phys. Discuss., https://doi

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Remote sensing evidence of decadal changes in major tropospheric ozone precursors over East Asia

et al. 2017

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Recent regulatory policies in East Asia reduce ozone precursors, but these changes are spatially and temporally nonuniform. This study investigates variations in the long‐term trends of tropospheric NO2, HCHO, and HCHO/NO2 ratios to diagnose ozone sensitivity to changes in NOx and volatile organic compound using the Ozone Monitoring Instrument (OMI). Using an adaptive‐degree polynomial filter, we identify extremums of time series of NO2 to determine when and how NO2 change. Due to the regulations in China, trends which were predominantly upward turned downward. The years undergoing these changes primarily happened in 2011 and 2012. OMI column densities, however, suggest that NOx sources in South Korea, the Pearl River Delta (PRD), Taiwan, and Japan have not consistently decreased. Specifically, as Chinese exports of NO2 started subsiding, increasing trends in NO2 columns over several Korean cities, including Seoul, become evident. To quantify the changes in NOx emissions from summertime 2010 to 2014, we conduct a 3D‐Var inverse modeling using a regional model with MIX‐Asia inventory and estimate NOx emissions (in 2010 and 2014) for the PRD (1.6 and 1.5 Gg/d), the Yangtze River Delta (3.9 and 3.0 Gg/d), north China (15.6 and 14.3 Gg/d), South Korea (1.6 and 1.5 Gg/d), and Japan (2.7 and 2.6 Gg/d). OMI HCHO shows upward trends in East Asia resulting from anthropogenic effects; however, the magnitudes are negative in the PRD, Japan, North Korea, and Taiwan. OMI HCHO/NO2 ratios reveal that while South Korea, Japan, and the south of China have undergone toward more NOx‐sensitive regime, areas around the Bohai Sea have become more NOx saturated.

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Turnaround of Tropospheric Nitrogen Dioxide Pollution Trends in China, Japan, and South Korea

Cited by 55 publications

References 28 publications

A 15-year record (2001–2015) of the ratio of nitrate to non-sea-salt sulfate in precipitation over East Asia

A 15-year record (2001–2015) of the ratio of nitrate to non-sea-salt sulfate in precipitation over East Asia

A 15-year record (2001–2015) of the ratio of nitrate to non-seasalt sulfate in precipitation over East Asia

Remote sensing evidence of decadal changes in major tropospheric ozone precursors over East Asia

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