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https://doi.org/10.5194/acp-2020-759
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-759
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 Aug 2020

27 Aug 2020

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This preprint is currently under review for the journal ACP.

Global-regional nested simulation of particle number concentration by combing microphysical processes with an evolving organic aerosol module

Xueshun Chen1,3, Fangqun Yu6, Wenyi Yang1,3, Yele Sun1,2,3, Huansheng Chen1, Wei Du1,7, Jian Zhao1, Ying Wei1,4, Lianfang Wei1,3, Huiyun Du1, Zhe Wang1, Qizhong Wu5, Jie Li1,3, Junling An1,2, and Zifa Wang1,2,3 Xueshun Chen et al.
  • 1The State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 10100029, China
  • 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 4Institute of Urban Meteorology, China Meteorology Administration, Beijing 100089, China
  • 5College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China
  • 6Atmospheric Science Research Center, State University of New York at Albany, New York 12203, USA
  • 7Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki 00014, Finland

Abstract. Aerosol microphysical processes are essential for the next generation of global and regional climate and air quality models to determine the particle size distribution. The contribution of organic aerosol (OA) to particle formation, mass and number concentration is one of the major uncertainties in current models. A new global-regional nested aerosol model was developed to simulate detailed microphysical processes. The model combined an advanced particle microphysics (APM) module and a volatility basis-set (VBS) organic aerosol module to calculate the kinetic condensation of low volatile organic compounds and equilibrium partitioning of semi-volatile organic compounds in a 3-dimensional (3-D) framework using global-regional nested domain. In addition to the condensation of sulfuric acid, equilibrium partitioning of nitrate and ammonium, and the coagulation process of particles, the microphysical processes of the organic aerosols are realistically represented in our new model. The model uses high-resolution size-bins to calculate the size distribution of new particles formed through nucleation and subsequent growth. The multi-scale nesting allows the model to use high resolution to simulate the particle formation processes in the urban atmosphere in the background of regional and global environments. Using the nested domains, the model reasonably reproduced the OA components from analysis of Aerosol Mass Spectrometry (AMS) measurements by Positive Matrix Factorization (PMF) and the particle number size distribution (PNSD) in Megacity Beijing during a period of about a month. Anthropogenic organic species accounted for 67 % of the OA of secondary particles formed by nucleation and subsequent growth, significantly larger than that of biogenic OA. Over the global scale, the model well predicted the particle number concentration in various environments. The microphysical module combined with VBS simulated the universal distribution of organic components among the different aerosol populations. Model results strongly suggest the importance of anthropogenic organic species in aerosol particle formation and growth at polluted urban sites and over the whole globe under the influence of anthropogenic source areas.

Xueshun Chen et al.

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Short summary
The atmospheric aerosol particles have significant climate and health effects, which depend on aerosol size, composition, and mixing state. A new global-regional nested aerosol model with an advanced particle microphysics module and a volatility basis-set organic aerosol module was developed to simulate the aerosol microphysical processes. Simulations strongly suggest the important role of anthropogenic organic species in particle formation over the areas influenced by anthropogenic sources.
The atmospheric aerosol particles have significant climate and health effects, which depend on...
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