Enhanced air pollution via aerosol-boundary layer feedback in China
Severe air pollution episodes have been frequent in China during the recent years. While high emissions are the primary reason for increasing pollutant concentrations, the ultimate cause for the most severe pollution episodes has remained unclear. Here we show that a high concentration of particulate matter (PM) will enhance the stability of an urban boundary layer, which in turn decreases the boundary layer height and consequently cause further increases in PM concentrations. We estimate the strength of this positive feedback mechanism by combining a new theoretical framework with ambient observations. We show that the feedback remains moderate at fine PM concentrations lower than about 200 μg m(-3), but that it becomes increasingly effective at higher PM loadings resulting from the combined effect of high surface PM emissions and massive secondary PM production within the boundary layer. Our analysis explains why air pollution episodes are particularly serious and severe in megacities and during the days when synoptic weather conditions stay constant.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2016 |
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| Erschienen: |
2016 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:6 |
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| Enthalten in: |
Scientific reports - 6(2016) vom: 12. Jan., Seite 18998 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Petäjä, T [VerfasserIn] |
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| Links: |
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| Themen: |
Aerosols |
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| Anmerkungen: |
Date Completed 13.12.2016 Date Revised 13.11.2018 published: Electronic Citation Status MEDLINE |
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| doi: |
10.1038/srep18998 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM256337756 |
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| 520 | |a Severe air pollution episodes have been frequent in China during the recent years. While high emissions are the primary reason for increasing pollutant concentrations, the ultimate cause for the most severe pollution episodes has remained unclear. Here we show that a high concentration of particulate matter (PM) will enhance the stability of an urban boundary layer, which in turn decreases the boundary layer height and consequently cause further increases in PM concentrations. We estimate the strength of this positive feedback mechanism by combining a new theoretical framework with ambient observations. We show that the feedback remains moderate at fine PM concentrations lower than about 200 μg m(-3), but that it becomes increasingly effective at higher PM loadings resulting from the combined effect of high surface PM emissions and massive secondary PM production within the boundary layer. Our analysis explains why air pollution episodes are particularly serious and severe in megacities and during the days when synoptic weather conditions stay constant | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
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| 650 | 7 | |a Particulate Matter |2 NLM | |
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| 700 | 1 | |a Järvi, L |e verfasserin |4 aut | |
| 700 | 1 | |a Kerminen, V-M |e verfasserin |4 aut | |
| 700 | 1 | |a Ding, A J |e verfasserin |4 aut | |
| 700 | 1 | |a Sun, J N |e verfasserin |4 aut | |
| 700 | 1 | |a Nie, W |e verfasserin |4 aut | |
| 700 | 1 | |a Kujansuu, J |e verfasserin |4 aut | |
| 700 | 1 | |a Virkkula, A |e verfasserin |4 aut | |
| 700 | 1 | |a Yang, X-Q |e verfasserin |4 aut | |
| 700 | 1 | |a Fu, C B |e verfasserin |4 aut | |
| 700 | 1 | |a Zilitinkevich, S |e verfasserin |4 aut | |
| 700 | 1 | |a Kulmala, M |e verfasserin |4 aut | |
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