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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-235
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 05 Apr 2018

Research article | 05 Apr 2018

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

Modelling studies of HOM and its contributions to growth of new particles: comparison of boreal forest in Finland and polluted environment in China

Ximeng Qi1,2,4, Aijun Ding1,2, Pontus Roldin3, Zhengning Xu1,2, Putian Zhou4, Nina Sarnela4, Wei Nie1,2, Xin Huang1,2, Anton Rusanen4, Mikael Ehn4, Matti P. Rissanen4, Tuukka Petäjä4,1, Markku Kulmala4, and Michael Boy4 Ximeng Qi et al.
  • 1Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing , 210023, China
  • 2Collaborative Innovation Center of Climate Change, Nanjing, 210023, China
  • 3Division of Nuclear Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden
  • 4Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland

Abstract. Highly oxygenated multifunctional compounds (HOM) play a key role in the growth of new particles during new particle formation (NPF) events, but their quantitative roles in different environments of the globe haven’t been well studied yet. In this study, the HOM concentrations and NPF events at a remote boreal forest site in Finland (SMEAR II) and a sub-urban site in the polluted eastern China (SORPES) were simulated with the MALTE-BOX model, and their roles in NPF at the two distinctly different environments are discussed. We found that sulfuric acid and HOM organonitrate concentrations in the gas phase are significantly higher but other HOM monomers and dimers from monoterpene oxidation are lower at SORPES compared to SMEAR II. The model can simulate the NPF events at SMEAR II with a good agreement but underestimate the growth of new particles at SORPES, indicating a dominant role of sulfuric acid and HOM originated from oxidation of aromatics in the polluted environment. This study highlight the needs of molecular-scale measurements in improving the understanding of NPF mechanisms in the polluted areas like eastern China.

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In this study we simulate the HOM concentrations and discuss their roles in NPF at a remote boreal forest site in Finland and a sub-urban site in eastern China. We found that sulfuric acid and HOM organonitrate concentrations in the gas phase are significantly higher but other HOM monomers and dimers from monoterpene oxidation are lower in eastern China. This study highlight the needs of molecular-scale measurements in improving the understanding of NPF mechanisms in the polluted areas.
In this study we simulate the HOM concentrations and discuss their roles in NPF at a remote...
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