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Discussion papers
https://doi.org/10.5194/acp-2018-1205
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1205
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Feb 2019

Research article | 04 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Organic coating on sulfate and soot particles in summer Arctic atmosphere

Hua Yu1,2, Weijun Li2, Yangmei Zhang3, Peter Tunved4, Manuel Dall'Osto5, Xiaojing Shen3, Junying Sun3, Xiaoye Zhang6, and Zongbo Shi7,8 Hua Yu et al.
  • 1College of Life and Environmental Sciences, Hangzhou Normal University, 310036, Hangzhou, China
  • 2Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, 310027, Hangzhou, China
  • 3Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing, China
  • 4Department of Environmental Science and Analytical Chemistry, Stockholm University, 10691, Stockholm, Sweden
  • 5Institute of Marine Sciences, ICM-CSIC, Passeig Marítim de la Barceloneta, 37-49, 08003, Barcelona, Spain
  • 6Key Laboratory of the Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029, China
  • 7School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK
  • 8Institute of Surface Earth System Science, Tianjin University, Tianjin, China

Abstract. Interaction of anthropogenic particles with radiation and clouds plays an important role on Arctic climate change. Mixing state of aerosols is a key parameter to influence aerosol-cloud and aerosol-radiation interaction. However, little is known on this parameter in the Arctic, preventing an accurate representation of this information in global models. Here we used transmission electron microscopy with energy-dispersive X-ray spectrometry (TEM/EDS), scanning TEM, scanning electron microscopy (SEM), nanoscale secondary ion mass spectrometry (NanoSIMS), and atomic forces microscopy (AFM) to determine the size and mixing properties of individual particles at 100 nm–10 μm, with a particular focus on sulfate and carbonaceous particles. We found that non-sea salt sulfate particles with size range at 100–2000 nm were commonly coated with organic matter (OM) in summer. 20 % of sulfate particles also had soot inclusions which only appeared in the organic coating. The OM coating is estimated to contribute to 63 % of the particle volume on average. Theoretical optical calculations from the Mie code suggest that absorption cross section of individual OM-coated particles significantly increased when assuming the OM coating as light-absorbing brown carbon (BrC). The microscopic observations suggest that OM modulates the mixing structure of fine Arctic sulfate particles, which may determine their hygroscopicity and optical properties.

Hua Yu et al.
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Short summary
Interaction of anthropogenic particles with radiation and clouds plays an important role on Arctic climate change. Mixing state of different aerosols is a key parameter to influence such interaction. However, little is known on this parameter, preventing an accurate representation of this information in global models. The multi-microscopic techniques were used to find one general core-shell structure that secondary sulfate particles were covered by organic coating in arctic atmosphere.
Interaction of anthropogenic particles with radiation and clouds plays an important role on...
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