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Discussion papers
https://doi.org/10.5194/acp-2019-308
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-308
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 23 May 2019

Submitted as: research article | 23 May 2019

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.

Measurement of aerosol properties during wintertime in Beijing

Misti Levy Zamora1,3, Jianfei Peng1,2, Min Hu2, Song Guo1,2, Wilmarie Marrero-Ortiz1, Dongjie Shang2, Jing Zheng2, Zhuofei Du2, Zhijun Wu2, and Renyi Zhang1,2 Misti Levy Zamora et al.
  • 1Department of Atmospheric Sciences and Department of Chemistry, Center for Atmospheric Chemistry and the Environment, Texas A&M University, College Station, TX 77843, USA
  • 2State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 3Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe St., Baltimore, Maryland 21205, USA

Abstract. Severe haze events with exceedingly high-levels of aerosols have occurred frequently in China in recent years, threatening human health and affecting regional and global radiative budget. A better knowledge of aerosol properties during haze events, particularly for those occurring during wintertime, will be helpful for elucidating the haze formation mechanism. In this study, we conducted a field measurement at an urban site in Beijing during January and February of 2015. A suite of aerosol instruments was deployed to measure a comprehensive set of aerosol chemical and physical properties. The haze events in winter, regulated by meteorological conditions, typically start with a new particle formation event and progress in terms of the subsequently continuous growth of the nucleation mode particles to submicron particles over the following multiple days. Particulate organic matters are primarily responsible for producing the nucleation mode particles, while secondary organic and inorganic components jointly contribute to the high aerosol mass observed during haze events. The average effective density and kappa value of ambient particles are approximately 1.37 g cm−3 and 0.25 during the clean days, and 1.42 g cm−3 and 0.4 during the severe haze episodes, respectively, indicating the formation of secondary inorganic species during the development of the severe haze events. Our results reveal that the periodic cycles of severe haze formation in Beijing during wintertime are attributed to the fast secondary aerosol formation due to the high gaseous precursor concentrations and the stagnant air mass, which are analogous to the severe haze events observed during autumn.

Misti Levy Zamora et al.
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Misti Levy Zamora et al.
Misti Levy Zamora et al.
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Short summary
The severe haze formation in Beijing during wintertime are attributed to the explosive secondary aerosol formation, including particle nucleation and subsequently continues particle growth. Organic matters are responsible for producing the nucleation mode particles, while secondary organic and inorganic components jointly contribute to the high aerosol mass during haze episodes. High levels of gaseous precursors and stagnant air mass are responsible for the fast secondary aerosol formation.
The severe haze formation in Beijing during wintertime are attributed to the explosive secondary...
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