气候变化领域集成服务门户(CCPortal): Precursors and formation of secondary organic aerosols from wildfires in the Euro-Mediterranean region

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DOI	10.5194/acp-19-5543-2019
	Precursors and formation of secondary organic aerosols from wildfires in the Euro-Mediterranean region
	Majdi M.; Sartelet K.; Maria Lanzafame G.; Couvidat F.; Kim Y.; Chrit M.; Turquety S.
发表日期	2019
ISSN	16807316
起始页码	5543
结束页码	5569
卷号	19 期号:8
英文摘要	This work aims at quantifying the relative contribution of secondary organic aerosol (SOA) precursors emitted by wildfires to organic aerosol (OA) formation during summer of 2007 over the Euro-Mediterranean region, where intense wildfires occurred. A new SOA formation mechanism, H2Oaro, including recently identified aromatic volatile organic compounds (VOCs) emitted from wildfires, is developed based on smog chamber experiment measurements under low- and high-NO regimes. The aromatic VOCs included in the mechanism are toluene, xylene, benzene, phenol, cresol, catechol, furan, naphthalene, methylnaphthalene, syringol, guaiacol, and structurally assigned and unassigned compounds with at least six carbon atoms per molecule (USC>6). This mechanism >H2Oaro is an extension of the >H2O (hydrophilic-hydrophobic organic) aerosol mechanism: the oxidation of the precursor forms surrogate species with specific thermodynamic properties (volatility, oxidation degree and affinity to water). The SOA concentrations over the Euro-Mediterranean region in summer of 2007 are simulated using the chemistry transport model (CTM) Polair3D of the air-quality platform Polyphemus, where the mechanism H2Oaro was implemented. To estimate the relative contribution of the aromatic VOCs, intermediate volatility, semi-volatile and low-volatility organic compounds (I/S/L-VOCs), to wildfires OA concentrations, different estimations of the gaseous I/S/L-VOC emissions (from primary organic aerosol - POA - using a factor of 1.5 or from non-methanic organic gas - NMOG - using a factor of 0.36) and their ageing (one-step oxidation vs. multi-generational oxidation) are also tested in the CTM.Most of the particle OA concentrations are formed from I/S/L-VOCs. On average during the summer of 2007 and over the Euro-Mediterranean domain, they are about 10 times higher than the OA concentrations formed from VOCs. However, locally, the OA concentrations formed from VOCs can represent up to 30 % of the OA concentrations from biomass burning. Amongst the VOCs, the main contributors to SOA formation are phenol, benzene and catechol (CAT; 47 %); USC 6 compounds (23 %); and toluene and xylene (12 %). Sensitivity studies of the influence of the VOCs and the I/S/L-VOC emissions and chemical ageing mechanisms on PM2.5 concentrations show that surface PM2.5 concentrations are more sensitive to the parameterization used for gaseous I/S/L-VOC emissions than for ageing.Estimating the gaseous I/S/L-VOC emissions from POA or from NMOG has a high impact on local surface PM2.5 concentrations (reaching 30% in the Balkans, 8% to 16% in the fire plume and +8% to +16% in Greece). Considering the VOC as SOA precursors results in a moderate increase in PM2.5 concentrations mainly in the Balkans (up to 24%) and in the fire plume (+10%). © Author(s) 2019.
语种	英语
scopus关键词	aerosol; air quality; biomass burning; concentration (composition); oxidation; volatile organic compound; wildfire; Polyphemus
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144457
作者单位	CEREA - joint laboratory École des Ponts ParisTech-EDF RandD, Université Paris-Est, Champs-sur-Marne, 77455, France; Laboratoire de Météorologie Dynamique (LMD) - IPSL, Sorbonne Université, CNRS UMR 8539, École Polytechnique, Paris, France; INERIS - Institut national de l'environnement industriel et des risques, Verneuil-en-Halatte, France
推荐引用方式 GB/T 7714	Majdi M.,Sartelet K.,Maria Lanzafame G.,et al. Precursors and formation of secondary organic aerosols from wildfires in the Euro-Mediterranean region[J],2019,19(8).
APA	Majdi M..,Sartelet K..,Maria Lanzafame G..,Couvidat F..,Kim Y..,...&Turquety S..(2019).Precursors and formation of secondary organic aerosols from wildfires in the Euro-Mediterranean region.Atmospheric Chemistry and Physics,19(8).
MLA	Majdi M.,et al."Precursors and formation of secondary organic aerosols from wildfires in the Euro-Mediterranean region".Atmospheric Chemistry and Physics 19.8(2019).