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

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Qi , X , Ding , A , Roldin , P , Xu , Z , Zhou , P , Sarnela , N , Nie , W , Huang , X , Rusanen , A , Ehn , M , Rissanen , M P , Petäjä , T , Kulmala , M & Boy , M 2018 , ' 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 ' , Atmospheric Chemistry and Physics , vol. 18 , no. 16 , pp. 11779-11791 . https://doi.org/10.5194/acp-18-11779-2018

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
Author: Qi, Ximeng; Ding, Aijun; Roldin, Pontus; Xu, Zhengning; Zhou, Putian; Sarnela, Nina; Nie, Wei; Huang, Xin; Rusanen, Anton; Ehn, Mikael; Rissanen, Matti P.; Petäjä, Tuukka; Kulmala, Markku; Boy, Michael
Contributor: University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018-08-20
Language: eng
Number of pages: 13
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/276980
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.
Subject: VOLATILE ORGANIC-COMPOUNDS
YANGTZE-RIVER DELTA
MASTER CHEMICAL MECHANISM
AEROSOL-SIZE DISTRIBUTION
EURASIAN EXPERIMENT PEEX
MCM V3 PART
SULFURIC-ACID
SORPES STATION
FORMATION EVENTS
LONG-TERM
1172 Environmental sciences
114 Physical sciences
116 Chemical sciences
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