The interaction between urbanization and aerosols during a typical winter haze event in Beijing
<p>Aerosols cause cooling at the surface by reducing shortwave radiation, while urbanization causes warming by altering the surface albedo and releasing anthropogenic heat. The combined effect of the two phenomena needs to be studied in depth. The effects of urbanization and aerosols were inve...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2020-08-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/20/9855/2020/acp-20-9855-2020.pdf |
| _version_ | 1818279039889047552 |
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| author | M. Yu G. Tang Y. Yang Q. Li Y. Wang S. Miao Y. Zhang Y. Wang |
| author_facet | M. Yu G. Tang Y. Yang Q. Li Y. Wang S. Miao Y. Zhang Y. Wang |
| author_sort | M. Yu |
| collection | DOAJ |
| description | <p>Aerosols cause cooling at the surface by reducing shortwave radiation, while
urbanization causes warming by altering the surface albedo and releasing
anthropogenic heat. The combined effect of the two phenomena needs to be
studied in depth. The effects of urbanization and aerosols were investigated
during a typical winter haze event. The event, which occurred in Beijing
from 15 to 22 December 2016, was studied via the Rapid-Refresh Multiscale
Analysis and Prediction System – Short Term (RMAPS-ST) model. The mechanisms
of the impacts of aerosols and urbanization were analyzed and quantified.
Aerosols reduced urban-related warming during the daytime by 20 % (from 30 %
to 50 %) as concentrations of fine particulate matter (PM<span class="inline-formula"><sub>2.5</sub></span>) increased from 200 to
400 <span class="inline-formula">µg m<sup>−3</sup></span>. Conversely, aerosols also enhanced urban-related
warming at dawn, and the increment was approximately 28 %, which
contributed to haze formation. Urbanization reduced the aerosol-related
cooling effect by approximately 54 % during the haze event, and the
strength of the impact changed little with increasing aerosol content. The
impact of aerosols on urban-related warming was more significant than the
impact of urbanization on aerosol-related cooling. Aerosols decreased the
urban impact on the mixing-layer height by 148 % and on the sensible heat
flux by 156 %. Furthermore, aerosols decreased the latent heat flux;
however, this reduction decreased by 48.8 % due to urbanization. The
impact of urbanization on the transport of pollutants was more important
than that of aerosols. The interaction between urbanization and aerosols may
enhance the accumulation of pollution and weigh against diffusion.</p> |
| first_indexed | 2024-12-12T23:27:00Z |
| format | Article |
| id | doaj.art-06b693fa29614843aeb3e447cb7fd054 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-12T23:27:00Z |
| publishDate | 2020-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-06b693fa29614843aeb3e447cb7fd0542022-12-22T00:08:00ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242020-08-01209855987010.5194/acp-20-9855-2020The interaction between urbanization and aerosols during a typical winter haze event in BeijingM. Yu0G. Tang1Y. Yang2Q. Li3Y. Wang4S. Miao5Y. Zhang6Y. Wang7Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, ChinaState Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Urban Meteorology, China Meteorological Administration, Beijing 100089, ChinaInstitute of Urban Meteorology, China Meteorological Administration, Beijing 100089, ChinaInstitute for Atmospheric and Earth System Research, Faculty of Science, P.O. Box 64, 00014 University of Helsinki, Helsinki, FinlandInstitute of Urban Meteorology, China Meteorological Administration, Beijing 100089, ChinaInstitute of Urban Meteorology, China Meteorological Administration, Beijing 100089, ChinaState Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China<p>Aerosols cause cooling at the surface by reducing shortwave radiation, while urbanization causes warming by altering the surface albedo and releasing anthropogenic heat. The combined effect of the two phenomena needs to be studied in depth. The effects of urbanization and aerosols were investigated during a typical winter haze event. The event, which occurred in Beijing from 15 to 22 December 2016, was studied via the Rapid-Refresh Multiscale Analysis and Prediction System – Short Term (RMAPS-ST) model. The mechanisms of the impacts of aerosols and urbanization were analyzed and quantified. Aerosols reduced urban-related warming during the daytime by 20 % (from 30 % to 50 %) as concentrations of fine particulate matter (PM<span class="inline-formula"><sub>2.5</sub></span>) increased from 200 to 400 <span class="inline-formula">µg m<sup>−3</sup></span>. Conversely, aerosols also enhanced urban-related warming at dawn, and the increment was approximately 28 %, which contributed to haze formation. Urbanization reduced the aerosol-related cooling effect by approximately 54 % during the haze event, and the strength of the impact changed little with increasing aerosol content. The impact of aerosols on urban-related warming was more significant than the impact of urbanization on aerosol-related cooling. Aerosols decreased the urban impact on the mixing-layer height by 148 % and on the sensible heat flux by 156 %. Furthermore, aerosols decreased the latent heat flux; however, this reduction decreased by 48.8 % due to urbanization. The impact of urbanization on the transport of pollutants was more important than that of aerosols. The interaction between urbanization and aerosols may enhance the accumulation of pollution and weigh against diffusion.</p>https://acp.copernicus.org/articles/20/9855/2020/acp-20-9855-2020.pdf |
| spellingShingle | M. Yu G. Tang Y. Yang Q. Li Y. Wang S. Miao Y. Zhang Y. Wang The interaction between urbanization and aerosols during a typical winter haze event in Beijing Atmospheric Chemistry and Physics |
| title | The interaction between urbanization and aerosols during a typical winter haze event in Beijing |
| title_full | The interaction between urbanization and aerosols during a typical winter haze event in Beijing |
| title_fullStr | The interaction between urbanization and aerosols during a typical winter haze event in Beijing |
| title_full_unstemmed | The interaction between urbanization and aerosols during a typical winter haze event in Beijing |
| title_short | The interaction between urbanization and aerosols during a typical winter haze event in Beijing |
| title_sort | interaction between urbanization and aerosols during a typical winter haze event in beijing |
| url | https://acp.copernicus.org/articles/20/9855/2020/acp-20-9855-2020.pdf |
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