Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution
<p>Persistent wintertime heavy haze incidents caused by anthropogenic aerosols have repeatedly shrouded North China in recent years, while natural dust from the west and northwest of China also frequently affects air quality in this region. Through continuous observation by a multi-wavelength...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2020-12-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/20/14917/2020/acp-20-14917-2020.pdf |
| _version_ | 1818591967676727296 |
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| author | Z. Wang Z. Wang C. Liu C. Liu C. Liu C. Liu C. Liu Z. Xie Z. Xie Z. Xie Z. Xie Q. Hu M. O. Andreae M. O. Andreae Y. Dong C. Zhao T. Liu Y. Zhu Y. Zhu H. Liu C. Xing W. Tan W. Tan X. Ji J. Lin J. Lin J. Liu J. Liu |
| author_facet | Z. Wang Z. Wang C. Liu C. Liu C. Liu C. Liu C. Liu Z. Xie Z. Xie Z. Xie Z. Xie Q. Hu M. O. Andreae M. O. Andreae Y. Dong C. Zhao T. Liu Y. Zhu Y. Zhu H. Liu C. Xing W. Tan W. Tan X. Ji J. Lin J. Lin J. Liu J. Liu |
| author_sort | Z. Wang |
| collection | DOAJ |
| description | <p>Persistent wintertime heavy haze incidents caused by
anthropogenic aerosols have repeatedly shrouded North China in recent years,
while natural dust from the west and northwest of China also frequently affects
air quality in this region. Through continuous observation by a
multi-wavelength Raman lidar, here we found that wintertime aerosols in
North China are typically characterized by a pronounced vertical
stratification, where scattering nonspherical particles (dust or mixtures
of dust and anthropogenic aerosols) dominated above the planetary boundary
layer (PBL), and absorbing spherical particles (anthropogenic aerosols)
prevailed within the PBL. This stratification is governed by meteorological
conditions that strong northwesterly winds usually prevailed in the lower
free troposphere, and southerly winds dominated in the PBL, producing
persistent and intense haze pollution. With the increased contribution of
elevated dust to the upper aerosols, the proportion of aerosol and trace gas
at the surface in the whole column increased. Model results show that,
besides directly deteriorating air quality, the key role of the elevated
dust is to depress the development of PBL and weaken the turbulent
exchange, mostly by lower level cooling and upper level heating, and it is
more obvious during the dissipation stage, thus inhibiting the dissipation of
heavy surface anthropogenic aerosols. The interactions of natural dust and
anthropogenic aerosols under the unique topography of North China increase
the surface anthropogenic aerosols and precursor gases, which may be one of
the reasons why haze<span id="page14918"/> pollution in North China is heavier than that in other
heavily polluted areas in China.</p> |
| first_indexed | 2024-12-16T10:20:51Z |
| format | Article |
| id | doaj.art-5ab43bb420c5420d9c918b065124697d |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-16T10:20:51Z |
| publishDate | 2020-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-5ab43bb420c5420d9c918b065124697d2022-12-21T22:35:19ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242020-12-0120149171493210.5194/acp-20-14917-2020Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollutionZ. Wang0Z. Wang1C. Liu2C. Liu3C. Liu4C. Liu5C. Liu6Z. Xie7Z. Xie8Z. Xie9Z. Xie10Q. Hu11M. O. Andreae12M. O. Andreae13Y. Dong14C. Zhao15T. Liu16Y. Zhu17Y. Zhu18H. Liu19C. Xing20W. Tan21W. Tan22X. Ji23J. Lin24J. Lin25J. Liu26J. Liu27Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaDepartment of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, ChinaKey Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaDepartment of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, ChinaCenter for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, ChinaKey Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230026, ChinaAnhui Province Key Laboratory of Polar Environment and Global Change, University of Science and Technology of China, Hefei, 230026, ChinaKey Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaCenter for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, ChinaDepartment of Environmental Science and Engineering, University of Science and Technology of China, Hefei, 230026, ChinaAnhui Province Key Laboratory of Polar Environment and Global Change, University of Science and Technology of China, Hefei, 230026, ChinaKey Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaMax Planck Institute for Chemistry, 55128 Mainz, GermanyDepartment of Geology and Geophysics, King Saud University, 11451 Riyadh, Saudi ArabiaKey Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaSchool of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, ChinaSchool of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, ChinaKey Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaDepartment of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, ChinaInstitute of Physical Science and Information Technology, Anhui University, Hefei, 230601, ChinaKey Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaKey Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaDepartment of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, ChinaSchool of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei, 230026, ChinaKey Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaDepartment of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, ChinaKey Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaCenter for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China<p>Persistent wintertime heavy haze incidents caused by anthropogenic aerosols have repeatedly shrouded North China in recent years, while natural dust from the west and northwest of China also frequently affects air quality in this region. Through continuous observation by a multi-wavelength Raman lidar, here we found that wintertime aerosols in North China are typically characterized by a pronounced vertical stratification, where scattering nonspherical particles (dust or mixtures of dust and anthropogenic aerosols) dominated above the planetary boundary layer (PBL), and absorbing spherical particles (anthropogenic aerosols) prevailed within the PBL. This stratification is governed by meteorological conditions that strong northwesterly winds usually prevailed in the lower free troposphere, and southerly winds dominated in the PBL, producing persistent and intense haze pollution. With the increased contribution of elevated dust to the upper aerosols, the proportion of aerosol and trace gas at the surface in the whole column increased. Model results show that, besides directly deteriorating air quality, the key role of the elevated dust is to depress the development of PBL and weaken the turbulent exchange, mostly by lower level cooling and upper level heating, and it is more obvious during the dissipation stage, thus inhibiting the dissipation of heavy surface anthropogenic aerosols. The interactions of natural dust and anthropogenic aerosols under the unique topography of North China increase the surface anthropogenic aerosols and precursor gases, which may be one of the reasons why haze<span id="page14918"/> pollution in North China is heavier than that in other heavily polluted areas in China.</p>https://acp.copernicus.org/articles/20/14917/2020/acp-20-14917-2020.pdf |
| spellingShingle | Z. Wang Z. Wang C. Liu C. Liu C. Liu C. Liu C. Liu Z. Xie Z. Xie Z. Xie Z. Xie Q. Hu M. O. Andreae M. O. Andreae Y. Dong C. Zhao T. Liu Y. Zhu Y. Zhu H. Liu C. Xing W. Tan W. Tan X. Ji J. Lin J. Lin J. Liu J. Liu Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution Atmospheric Chemistry and Physics |
| title | Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution |
| title_full | Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution |
| title_fullStr | Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution |
| title_full_unstemmed | Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution |
| title_short | Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution |
| title_sort | elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution |
| url | https://acp.copernicus.org/articles/20/14917/2020/acp-20-14917-2020.pdf |
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