Nitrogen isotopic characteristics of aerosol ammonium in a Chinese megacity indicate the reduction from vehicle emissions during the lockdown period
Copyright © 2024 Elsevier B.V. All rights reserved..
The role of agricultural versus vehicle emissions in urban atmospheric ammonia (NH3) remains unclear. The lockdown due to the outbreak of COVID-19 provided an opportunity to assess the role of source emissions on urban NH3. Concentrations and δ15N of aerosol ammonium (NH4+) were measured before (autumn in 2017) and during the lockdown (summer, autumn, and winter in 2020), and source contributions were quantified using SIAR. Despite the insignificant decrease in NH4+ concentrations, significantly lower δ15N-NH4+ was found in 2020 (0.6 ± 1.0‰ in PM2.5 and 1.4 ± 2.1‰ in PM10) than in 2017 (15.2 ± 6.7‰ in PM2.5), which indicates the NH3 from vehicle emissions has decreased by∼50% during the lockdown while other source emissions are less affected. Moreover, a reversed seasonal pattern of δ15N-NH4+ during the lockdown in Changsha has been revealed compared to previous urban studies, which can be explained by the dominant effect of non-fossil fuel emissions due to the reductions of vehicle emissions during the lockdown period. Our results highlight the effects of lockdown on aerosol δ15N-NH4+ and the importance of vehicle emissions to urban atmospheric NH3, providing conclusive evidence that reducing vehicle NH3 emissions could be an effective strategy to reduce PM2.5 in Chinese megacities.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:922 |
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| Enthalten in: |
The Science of the total environment - 922(2024) vom: 20. März, Seite 171265 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Li, Zhengjie [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 20.03.2024 Date Revised 20.03.2024 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.scitotenv.2024.171265 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM369074343 |
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| 245 | 1 | 0 | |a Nitrogen isotopic characteristics of aerosol ammonium in a Chinese megacity indicate the reduction from vehicle emissions during the lockdown period |
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| 520 | |a The role of agricultural versus vehicle emissions in urban atmospheric ammonia (NH3) remains unclear. The lockdown due to the outbreak of COVID-19 provided an opportunity to assess the role of source emissions on urban NH3. Concentrations and δ15N of aerosol ammonium (NH4+) were measured before (autumn in 2017) and during the lockdown (summer, autumn, and winter in 2020), and source contributions were quantified using SIAR. Despite the insignificant decrease in NH4+ concentrations, significantly lower δ15N-NH4+ was found in 2020 (0.6 ± 1.0‰ in PM2.5 and 1.4 ± 2.1‰ in PM10) than in 2017 (15.2 ± 6.7‰ in PM2.5), which indicates the NH3 from vehicle emissions has decreased by∼50% during the lockdown while other source emissions are less affected. Moreover, a reversed seasonal pattern of δ15N-NH4+ during the lockdown in Changsha has been revealed compared to previous urban studies, which can be explained by the dominant effect of non-fossil fuel emissions due to the reductions of vehicle emissions during the lockdown period. Our results highlight the effects of lockdown on aerosol δ15N-NH4+ and the importance of vehicle emissions to urban atmospheric NH3, providing conclusive evidence that reducing vehicle NH3 emissions could be an effective strategy to reduce PM2.5 in Chinese megacities | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Ammonia | |
| 650 | 4 | |a COVID-19 lockdown | |
| 650 | 4 | |a Emission regulations | |
| 650 | 4 | |a Nitrogen isotopes | |
| 650 | 4 | |a Urban aerosol | |
| 650 | 4 | |a Vehicle emissions | |
| 650 | 7 | |a Ammonium Compounds |2 NLM | |
| 650 | 7 | |a Nitrogen Isotopes |2 NLM | |
| 650 | 7 | |a Vehicle Emissions |2 NLM | |
| 650 | 7 | |a Air Pollutants |2 NLM | |
| 650 | 7 | |a Ammonia |2 NLM | |
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| 650 | 7 | |a Particulate Matter |2 NLM | |
| 700 | 1 | |a Xiao, Hongwei |e verfasserin |4 aut | |
| 700 | 1 | |a Walters, Wendell W |e verfasserin |4 aut | |
| 700 | 1 | |a Hastings, Meredith G |e verfasserin |4 aut | |
| 700 | 1 | |a Min, Juan |e verfasserin |4 aut | |
| 700 | 1 | |a Song, Linlin |e verfasserin |4 aut | |
| 700 | 1 | |a Lu, Weizhi |e verfasserin |4 aut | |
| 700 | 1 | |a Wu, Libin |e verfasserin |4 aut | |
| 700 | 1 | |a Yan, Wende |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Shuguang |e verfasserin |4 aut | |
| 700 | 1 | |a Fang, Yunting |e verfasserin |4 aut | |
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