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

Ximeng Qi, Aijun Ding, Pontus Roldin, Zhengning Xu, Putian Zhou, Nina Sarnela, Wei Nie, Xin Huang, Anton Rusanen, Mikael Ehn, Matti P. Rissanen, Tuukka Petäjä, Markku Kulmala, Michael Boy

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

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 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 monoter-pene 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.
Original languageEnglish
Pages (from-to)11779-11791
Number of pages13
JournalAtmospheric Chemistry and Physics
Volume18
Issue number16
DOIs
Publication statusPublished - 1 Aug 2018
Externally publishedYes
Publication typeA1 Journal article-refereed

Keywords

  • 114 Physical sciences
  • SULFURIC-ACID
  • 116 Chemical sciences
  • VOLATILE ORGANIC-COMPOUNDS
  • 1172 Environmental sciences
  • AEROSOL-SIZE DISTRIBUTION
  • EURASIAN EXPERIMENT PEEX
  • FORMATION EVENTS
  • LONG-TERM
  • MASTER CHEMICAL MECHANISM
  • MCM V3 PART
  • SORPES STATION
  • YANGTZE-RIVER DELTA

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