气候变化领域集成服务门户(CCPortal): Size-dependent Molecular Characteristics and Possible Sources of Organic Aerosols at a Coastal New Particle Formation Hotspot of East China

CCPortal

DOI	10.1029/2021JD034610
	Size-dependent Molecular Characteristics and Possible Sources of Organic Aerosols at a Coastal New Particle Formation Hotspot of East China
	Wan Y.; Huang X.; Ge X.; Jiang B.; Liao Y.; Yan Q.; Shuai Q.; Fu Q.; Xiao H.; Yu H.
发表日期	2021
ISSN	2169897X
卷号	126 期号:11
英文摘要	We investigated size-dependent molecular characteristics of coastal organic aerosols from <0.032 to 3.2 μm at a new particle formation (NPF) hotspot of east China by using Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR-MS). Strong connection between C20–33HhOo/C18,30HhOoNn compounds in particles smaller than 0.10 μm and the volatile organic compounds emitted from local intertidal macroalgae suggests that the organic compounds (OC) in ultrafine particles are formed probably via the gas-phase oxidation of long-chain fatty aldehydes or acids, followed by particle-phase accretion reactions or imine formation during the coastal NPF events. In 0.18–0.56 μm particles, dominant C8–C20 CHO, CHON, CHOS and CHONS compounds (maximum: C10 or C15) are suggested most likely to be terpene oxidation products. Highly oxygenated compounds with 0.6 ≤ H/C ≤ 1.5 and 0.67 ≤ O/C ≤ 1.2 reside mostly in 0.18–0.56 μm particles, accounting for 5% of the OC formulas in this size range. Iodinated OC are subsequently formed via electrophilic substitution of non-iodinated OC by iodine cations (e.g., from HOI or I2) in iodine-rich particles. CHN and Cl/Br-containing OC account altogether for only 0.7% and 0.9% of OC formulas, respectively. As a result of the above compound distribution, the intensity weighted unsaturation degree and carbon oxidation state of OC increase with particle size. The distribution of aromatic compounds (i.e. Aromaticity Index > 0.5) is bimodal with peaks in 0.056–0.18 μm and 1.0–3.2 μm. In addition, our study observed higher unsaturation degree, carbon oxidation state and aromaticity of OC in coastal PM2.5 than inland urban PM2.5 in the same region. © 2021. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185154
作者单位	School of Environmental Studies, China University of Geosciences, Wuhan, China; School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, China; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; School of Material Science and Chemistry, China University of Geosciences, Wuhan, China; Ningbo Urban Environment Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
推荐引用方式 GB/T 7714	Wan Y.,Huang X.,Ge X.,et al. Size-dependent Molecular Characteristics and Possible Sources of Organic Aerosols at a Coastal New Particle Formation Hotspot of East China[J],2021,126(11).
APA	Wan Y..,Huang X..,Ge X..,Jiang B..,Liao Y..,...&Yu H..(2021).Size-dependent Molecular Characteristics and Possible Sources of Organic Aerosols at a Coastal New Particle Formation Hotspot of East China.Journal of Geophysical Research: Atmospheres,126(11).
MLA	Wan Y.,et al."Size-dependent Molecular Characteristics and Possible Sources of Organic Aerosols at a Coastal New Particle Formation Hotspot of East China".Journal of Geophysical Research: Atmospheres 126.11(2021).