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Modelling studies of HOMs and their contributions to new particle formation and growth : Comparison of boreal forest in Finland and a polluted environment in China

Qi, Ximeng; Ding, Aijun; Roldin, Pontus LU ; Xu, Zhengning; Zhou, Putian; Sarnela, Nina; Nie, Wei; Huang, Xin; Rusanen, Anton and Ehn, Mikael, et al. (2018) In Atmospheric Chemistry and Physics 18(16). p.11779-11791
Abstract

Highly oxygenated multifunctional compounds (HOMs) play a key role in new particle formation (NPF), but their quantitative roles in different environments of the globe have not been well studied yet. Frequent NPF events were observed at two flagship stations under different environmental conditions, i.e. a remote boreal forest site (SMEAR II) in Finland and a suburban site (SORPES) in polluted eastern China. The averaged formation rate of 6 nm particles and the growth rate of 6-30 nm particles were 0.3 cm-3 s-1 and 4.5 nm h-1 at SMEAR II compared to 2.3 cm-3 s-1 and 8.7 nm h-1 at SORPES, respectively. To explore the differences of NPF at the two stations, the HOM... (More)

Highly oxygenated multifunctional compounds (HOMs) play a key role in new particle formation (NPF), but their quantitative roles in different environments of the globe have not been well studied yet. Frequent NPF events were observed at two flagship stations under different environmental conditions, i.e. a remote boreal forest site (SMEAR II) in Finland and a suburban site (SORPES) in polluted eastern China. The averaged formation rate of 6 nm particles and the growth rate of 6-30 nm particles were 0.3 cm-3 s-1 and 4.5 nm h-1 at SMEAR II compared to 2.3 cm-3 s-1 and 8.7 nm h-1 at SORPES, respectively. To explore the differences of NPF at the two stations, the HOM concentrations and NPF events at two sites were simulated with the MALTE-BOX model, and their roles in NPF and particle growth in the two distinctly different environments are discussed. The model provides an acceptable agreement between the simulated and measured concentrations of sulfuric acid and HOMs at SMEAR II. The sulfuric acid and HOM organonitrate concentrations are significantly higher but other HOM monomers and dimers from monoterpene oxidation are lower at SORPES compared to SMEAR II. The model simulates the NPF events at SMEAR II with a good agreement but underestimates the growth of new particles at SORPES, indicating a dominant role of anthropogenic processes in the polluted environment. HOMs from monoterpene oxidation dominate the growth of ultrafine particles at SMEAR II while sulfuric acid and HOMs from aromatics oxidation play a more important role in particle growth. This study highlights the distinct roles of sulfuric acid and HOMs in NPF and particle growth in different environmental conditions and suggests the need for molecular-scale measurements in improving the understanding of NPF mechanisms in polluted areas like eastern China.

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Atmospheric Chemistry and Physics
volume
18
issue
16
pages
13 pages
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • scopus:85052060042
ISSN
1680-7316
DOI
10.5194/acp-18-11779-2018
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English
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yes
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83f113d2-e28a-40bc-8564-be13a06ffb0c
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2018-09-26 14:51:17
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2019-01-20 05:58:23
@article{83f113d2-e28a-40bc-8564-be13a06ffb0c,
  abstract     = {<p>Highly oxygenated multifunctional compounds (HOMs) play a key role in new particle formation (NPF), but their quantitative roles in different environments of the globe have not been well studied yet. Frequent NPF events were observed at two flagship stations under different environmental conditions, i.e. a remote boreal forest site (SMEAR II) in Finland and a suburban site (SORPES) in polluted eastern China. The averaged formation rate of 6 nm particles and the growth rate of 6-30 nm particles were 0.3 cm<sup>-3</sup> s<sup>-1</sup> and 4.5 nm h<sup>-1</sup> at SMEAR II compared to 2.3 cm<sup>-3</sup> s<sup>-1</sup> and 8.7 nm h<sup>-1</sup> at SORPES, respectively. To explore the differences of NPF at the two stations, the HOM concentrations and NPF events at two sites were simulated with the MALTE-BOX model, and their roles in NPF and particle growth in the two distinctly different environments are discussed. The model provides an acceptable agreement between the simulated and measured concentrations of sulfuric acid and HOMs at SMEAR II. The sulfuric acid and HOM organonitrate concentrations are significantly higher but other HOM monomers and dimers from monoterpene oxidation are lower at SORPES compared to SMEAR II. The model simulates the NPF events at SMEAR II with a good agreement but underestimates the growth of new particles at SORPES, indicating a dominant role of anthropogenic processes in the polluted environment. HOMs from monoterpene oxidation dominate the growth of ultrafine particles at SMEAR II while sulfuric acid and HOMs from aromatics oxidation play a more important role in particle growth. This study highlights the distinct roles of sulfuric acid and HOMs in NPF and particle growth in different environmental conditions and suggests the need for molecular-scale measurements in improving the understanding of NPF mechanisms in polluted areas like eastern China.</p>},
  author       = {Qi, Ximeng and Ding, Aijun and Roldin, Pontus and Xu, Zhengning and Zhou, Putian and Sarnela, Nina and Nie, Wei and Huang, Xin and Rusanen, Anton and Ehn, Mikael and Rissanen, Matti P. and Petäjä, Tuukka and Kulmala, Markku and Boy, Michael},
  issn         = {1680-7316},
  language     = {eng},
  month        = {08},
  number       = {16},
  pages        = {11779--11791},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Modelling studies of HOMs and their contributions to new particle formation and growth : Comparison of boreal forest in Finland and a polluted environment in China},
  url          = {http://dx.doi.org/10.5194/acp-18-11779-2018},
  volume       = {18},
  year         = {2018},
}