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

作　　者：Kun Li Jun Zhang David M.Bell Tiantian Wang Houssni Lamkaddam Tianqu Cui Lu Qi Mihnea Surdu Dongyu Wang Lin Du Imad El Haddad Jay G.Slowik Andre S.H.Prevot 

机构地区：[1]Environment Research Institute,Shandong University,Qingdao 266237,China [2]Laboratory of Atmospheric Chemistry,Paul Scherrer Institute,Villigen 5232,Switzerland

出　　处：《National Science Review》2024年第3期144-152,共9页国家科学评论（英文版）

基　　金：supported by the National Key Research and Development Program of China(2023YFC3710400);the National Natural Science Foundation of China(42305100);the Swiss National Science Foundation(MOLORG grant 200020_188624);the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No.884104(PSI-FELLOW-Ⅲ-3i).

摘　　要：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.

关 键 词：atmospheric chemistry biomass burning secondary organic aerosol intermediate volatility organic compounds 

分 类 号：P618.51[天文地球—矿床学]