北京大气中新粒子形成过程中纳米粒子输运的显著影响

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL Particuology Pub Date : 2023-09-01 DOI:10.1016/j.partic.2022.12.006

Dongjie Shang , Min Hu , Lizi Tang , Xin Fang , Ying Liu , Yusheng Wu , Zhuofei Du , Xuhui Cai , Zhijun Wu , Shengrong Lou , Mattias Hallquist , Song Guo , Yuanhang Zhang

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引用次数: 3

摘要

在大气中高气溶胶负荷(“污染的”NPF)下发生的新颗粒形成(NPF)事件的机制尚不清楚，这抑制了颗粒污染控制的精度。为了加深对“污染”NPF事件如何发生的理解，我们在2016年夏季对北京大气进行了为期一个月的综合测量。“干净”NPF事件(频率= 22%)(冷凝汇，CS <0.015 s−1)是由局部成核和生长引起的。“受污染”的NPF事件(频率= 28%)(CS >0.015 s−1)同时受到局部成核生长和区域输运的影响，两者对6 ~ 25 nm颗粒数浓度的贡献分别为60%和40%。本研究强调了纳米颗粒在相对污染的大气中运移的重要性，因此区域联合颗粒污染控制将是必不可少的政策。

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Significant effects of transport on nanoparticles during new particle formation events in the atmosphere of Beijing

The mechanisms of new particle formation (NPF) events that occurred under high aerosol loadings (“polluted” NPF) in the atmosphere have been unclear, which has inhibited the precision of particle pollution control. To deepen the understanding of how the “polluted” NPF events occur, a one-month comprehensive measurement was conducted in the atmosphere of Beijing during the summer of 2016. The “clean” NPF events (frequency = 22%) (condensation sink, CS < 0.015 s⁻¹) were found to be caused by local nucleation and growth. The “polluted” NPF events (frequency = 28%) (CS > 0.015 s⁻¹) were influenced by both local nucleation-growth and regional transport, and the contributions from the two factors to 6–25 nm particle number concentration were 60% and 40%, respectively. This study emphasized the importance of the transport for nanoparticles in relatively polluted atmospheres, and for that the regional joint particle pollution control would be an essential policy.

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.