Uncovering the dominant contribution of intermediate volatility compounds in secondary organic aerosol formation from biomass-burning emissions

Author:

Li Kun12,Zhang Jun2,Bell David M2,Wang Tiantian2,Lamkaddam Houssni2,Cui Tianqu2,Qi Lu2,Surdu Mihnea2,Wang Dongyu2,Du Lin1,El Haddad Imad2,Slowik Jay G2,Prevot Andre S H2

Affiliation:

1. Environment Research Institute, Shandong University , Qingdao 266237 , China

2. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute , Villigen 5232 , Switzerland

Abstract

ABSTRACT Organic vapors from biomass burning are a major source of secondary organic aerosols (SOAs). Previous smog chamber studies found that the SOA contributors in biomass-burning emissions are mainly volatile organic compounds (VOCs). While intermediate volatility organic compounds (IVOCs) are efficient SOA precursors and contribute a considerable fraction of biomass-burning emissions, their contribution to SOA formation has not been directly observed. Here, by deploying a newly-developed oxidation flow reactor to study SOA formation from wood burning, we find that IVOCs can contribute ∼70% of the formed SOA, i.e. >2 times more than VOCs. This previously missing SOA fraction is interpreted to be due to the high wall losses of semi-volatile oxidation products of IVOCs in smog chambers. The finding in this study reveals that SOA production from biomass burning is much higher than previously thought, and highlights the urgent need for more research on the IVOCs from biomass burning and potentially other emission sources.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Swiss National Science Foundation

H2020 Marie Skłodowska-Curie Actions

Publisher

Oxford University Press (OUP)

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