气候变化领域集成服务门户(CCPortal): Diel cycle impacts on the chemical and light absorption properties of organic carbon aerosol from wildfires in the western United States

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DOI	10.5194/acp-21-11843-2021
	Diel cycle impacts on the chemical and light absorption properties of organic carbon aerosol from wildfires in the western United States
	Sumlin B.; Fortner E.; Lambe A.; Shetty N.J.; Daube C.; Liu P.; Majluf F.; Herndon S.; Chakrabarty R.K.
发表日期	2021
ISSN	1680-7316
起始页码	11843
结束页码	11856
卷号	21 期号:15
英文摘要	Organic aerosol (OA) emissions from biomass burning have been the subject of intense research in recent years, involving a combination of field campaigns and laboratory studies. These efforts have aimed at improving our limited understanding of the diverse processes and pathways involved in the atmospheric processing and evolution of OA properties, culminating in their accurate parameterizations in climate and chemical transport models. To bring closure between laboratory and field studies, wildfire plumes in the western United States were sampled and characterized for their chemical and optical properties during the ground-based segment of the 2019 Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) field campaign. Using a custom-developed multiwavelength integrated photoacoustic-nephelometer spectrometer in conjunction with a suite of instruments, including an oxidation flow reactor equipped to generate hydroxyl (OH•) or nitrate (NO3•) radicals to mimic daytime or nighttime oxidative aging processes, we investigated the effects of multiple equivalent hours of OH• or NO3• exposure on the chemical composition and mass absorption cross-sections (MAC(λ)) at 488 and 561nm of OA emitted from wildfires in Arizona and Oregon. We found that OH• exposure induced a slight initial increase in absorption corresponding to short timescales; however, at longer timescales, the wavelength-dependent MAC(λ) decreased by a factor of 0.72±0.08, consistent with previous laboratory studies and reports of photobleaching. On the other hand, NO3• exposure increased MAC(λ) by a factor of up to 1.69±0.38. We also noted some sensitivity of aerosol aging to different fire conditions between Arizona and Oregon. The MAC(λ) enhancement following NO3• exposure was found to correlate with an enhancement in CHO1N and CHOgt1N ion families measured by an Aerodyne aerosol mass spectrometer. © Author(s) 2021.
语种	英语
scopus关键词	absorption; aerosol; air quality; chemical composition; diel variation; ground-based measurement; optical property; organic carbon; wildfire; United States
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/246671
作者单位	Department of Energy, Environmental, and Chemical Engineering, Center for Aerosol Science and Engineering, Washington University in St. Louis, St. Louis, MO, United States; Aerodyne Research, Inc., Billerica, MA, United States
推荐引用方式 GB/T 7714	Sumlin B.,Fortner E.,Lambe A.,et al. Diel cycle impacts on the chemical and light absorption properties of organic carbon aerosol from wildfires in the western United States[J],2021,21(15).
APA	Sumlin B..,Fortner E..,Lambe A..,Shetty N.J..,Daube C..,...&Chakrabarty R.K..(2021).Diel cycle impacts on the chemical and light absorption properties of organic carbon aerosol from wildfires in the western United States.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(15).
MLA	Sumlin B.,et al."Diel cycle impacts on the chemical and light absorption properties of organic carbon aerosol from wildfires in the western United States".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.15(2021).