Understanding of New Atmospheric Particles Formation

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Aerosols".

Deadline for manuscript submissions: closed (1 August 2022) | Viewed by 1682

Special Issue Editor


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Guest Editor
California Air Resources Board, 1001 I St, Sacramento, CA 95814, USA
Interests: emissions; inventory; new particle formation; particle mobility

Special Issue Information

Dear Colleagues,

Atmospheric nucleation and new particle formation (NPF) are frequently observed in the natural environment. Previous research and studies have demonstrated that NPF in the free troposphere and its subsequent downward transport to the boundary layer contribute significantly to the global cloud condensation nuclei (CCN) budget. In addition, NPF is also responsible for the formation of urban smog and haze in urban environments. Since the newly formed nanometer-sized particles are small enough to be deposited in the pulmonary region or to penetrate into the bloodstream, they can raise serious health concerns that are related to human exposures to particulate matter.

Despite the rigorous efforts that have been made to measure, characterize, and understand NPF, there are still challenges lying ahead. The impact of NPF and aerosol particles on cloud formation still remains one of the biggest uncertainties in evaluating the Earth’s radiative forcing, and how it contributes to air pollution, especially in populated megacities, is also open to discussion. 

Original findings on NPF, such as mechanisms that drive atmospheric nucleation and particle early growth, measurements of nanometer-sized particles, and evaluation of the impact of NPF on regional air quality and global climate, are all welcome contributors to this Special Issue. 

Dr. Weimeng Kong
Guest Editor

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Keywords

  • air quality
  • new particle formation
  • atmospheric nucleation
  • cloud condensation nuclei
  • particulate pollution
  • global climate

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Published Papers (1 paper)

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Research

18 pages, 4407 KiB  
Article
Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean
by Xingyu Zhang, Xiquan Dong, Baike Xi and Xiaojian Zheng
Atmosphere 2023, 14(8), 1246; https://doi.org/10.3390/atmos14081246 - 4 Aug 2023
Cited by 1 | Viewed by 1373
Abstract
Five overcast marine stratocumulus cases during the Southern Ocean Clouds Radiation Aerosol Transport Experimental Study (SOCRATES) aircraft field campaign were selected to examine aerosol and cloud condensation nuclei (CCN) properties with cloud influence. The Aitken- and accumulation-mode aerosols contributed approximately 70% and 30% [...] Read more.
Five overcast marine stratocumulus cases during the Southern Ocean Clouds Radiation Aerosol Transport Experimental Study (SOCRATES) aircraft field campaign were selected to examine aerosol and cloud condensation nuclei (CCN) properties with cloud influence. The Aitken- and accumulation-mode aerosols contributed approximately 70% and 30% of the total aerosols, respectively. The aerosol properties before and after periods of drizzle were investigated using in situ measurements during one case. Sub-cloud drizzle processes impacted accumulation-mode aerosols and CCN distribution. There was a nearly linear increase in CCN number concentration (NCCN) with supersaturation (S) during the ‘before drizzle’ period, but this was not true for the ‘after drizzle’ period, particularly when S > 0.4%. Using the hygroscopicity parameter (κ) to quantitatively investigate the chemical cloud-processing mechanisms, we found that higher κ values (>0.4) represent cloud-processing aerosols, while lower κ values (<0.1) represent newly formed aerosols. When the supersaturation is less than the Hoppel minimum (0.22%), cloud processing is dominant, whereas sea-spray aerosols are dominant contributors to CCN activation when S exceeds 0.22% but is less than 0.32%, the effective supersaturation threshold. Sea salt is considered a non-cloud-processing aerosol and is large and hygroscopic enough to form cloud droplets. Full article
(This article belongs to the Special Issue Understanding of New Atmospheric Particles Formation)
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