Special Issue "Chemical and Morphological Characterization of Atmospheric Aerosols"

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

Deadline for manuscript submissions: 5 October 2023 | Viewed by 1954

Special Issue Editor

Department of Chemistry Biology and Biotechnology, University of Perugia, 06123 Perugia, Italy
Interests: geochemistry; mineralogy; individual particle analysis; particulate matter; dust sources; aerosol science and technology; air quality
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Aerosols are a major part of atmospheric air. They are complex mixtures originating from a variety of natural and anthropogenic processes in different contexts. The morphology and chemical composition, as well as the chemical–physical state of surfaces, say a lot about the “history” and surface reactivity of aerosol particles, thus allowing to reconstruct their origin as well as to predict their effects on the environment and human health—hence the need for combined chemical and morphological/morphostructural studies in the detailed characterization of aerosols.

The goal of this Special Issue is to collect scientific contributions on the characterization of aerosols sharing a dual chemical and morphological approach in the analysis of the constituent particles. All types of aerosols from outdoor (e.g., rural, urban, remote) and indoor (e.g., domestic, occupational) environments, along with their mutual relationships, can be considered, and both micro- and nanoparticles can be treated. Analytical techniques can also be very diverse, ranging from the most popular (e.g., scanning and transmission electron microscopy, atomic force microscopy, Raman microspectroscopy, X-ray microscopy with near edge X-ray absorption fine structure spectroscopy, inductively coupled plasma mass spectrometry with laser ablation or time-of-flight) to the latest and most cutting-edge ones.

Dr. Beatrice Moroni
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atmosphere is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • anthropogenic and natural aerosols
  • secondary aerosols
  • structure and texture
  • mineralogy and geochemistry
  • surface analysis
  • image analysis
  • urban, remote, indoor environments

Published Papers (2 papers)

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Research

Article
Assessment of Carbonaceous Aerosol Properties across an Urban Environment during the Cold Season
Atmosphere 2023, 14(7), 1054; https://doi.org/10.3390/atmos14071054 - 21 Jun 2023
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Abstract
For air quality management it is becoming increasingly important to be able to assess the quantity and properties of biomass-burning-related aerosol. Due to different chemical compositions and morphologies, black carbon (BC) and brown carbon (BrC) demonstrate diverse optical properties as well as an [...] Read more.
For air quality management it is becoming increasingly important to be able to assess the quantity and properties of biomass-burning-related aerosol. Due to different chemical compositions and morphologies, black carbon (BC) and brown carbon (BrC) demonstrate diverse optical properties as well as an impact on air quality. In this study, we analyzed the chemical composition and light-absorbing properties of carbonaceous aerosol at an urban background station during the residential heating season. In addition, BC and BrC levels were assessed in six different areas in the city characterized by different predominant domestic heating systems. Positive matrix factorization (PMF) and BrC attribution analysis revealed that BrC mainly consisted of biomass-burning-related organic aerosol (BBOA) (up to 95%). The mass absorption cross-section at 370 nm for BBOA factors varied between 1.41 m2g−1 and 2.63 m2g−1. The study of six different areas in the city showed that the input of BrC to the total light absorption coefficient within the city varied between 33% and 70%. In addition, the worst air quality was present in areas with numerous old wooden houses with outdated heating systems where significantly increased BC and BrC levels were observed. Full article
(This article belongs to the Special Issue Chemical and Morphological Characterization of Atmospheric Aerosols)
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Article
Fractal Dimensions of Biomass Burning Aerosols from TEM Images Using the Box-Grid and Nested Squares Methods
Atmosphere 2023, 14(2), 221; https://doi.org/10.3390/atmos14020221 - 20 Jan 2023
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Abstract
The fractal dimension is a key parameter in quantifying the morphology of aerosol aggregates, which is necessary to understand their radiative impact. Here we used Transmission Electron Microscopy (TEM) images to determine 2D fractal dimensions using the nested square and box-grid method and [...] Read more.
The fractal dimension is a key parameter in quantifying the morphology of aerosol aggregates, which is necessary to understand their radiative impact. Here we used Transmission Electron Microscopy (TEM) images to determine 2D fractal dimensions using the nested square and box-grid method and used two different empirical equations to obtain the 3D fractal dimensions. The values ranged from 1.70 ± 0.05 for pine to 1.82 ± 0.07 for Eucalyptus, with both methods giving nearly identical results using one of the empirical equations and the other overestimated the 3D values significantly when compared to other values in the literature. The values we obtained are comparable to the fractal dimensions of fresh aerosols in the literature and were dependent on fuel type and combustion condition. Although these methods accurately calculated the fractal dimension, they have shortcomings if the images are not of the highest quality. While there are many ways of determining the fractal dimension of linear features, we conclude that the application of every method requires careful consideration of a range of methodological concerns. Full article
(This article belongs to the Special Issue Chemical and Morphological Characterization of Atmospheric Aerosols)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Snowpack as record of aerosol transport and deposition over the Arctic

Abstract: The cryosphere is a fundamental, though fragile component of the Earth system. For various reasons, including progressive modification of atmospheric circulation and increasing production of dust directly in Arctic areas, it has been experiencing a dramatic evolution in the very recent times.

Snow analysis provides a huge amount of information about the nature and fate of atmospheric aerosols in the Arctic. First of all, and with respect to the aerosol, snow gets the the actual budget of deposition (both wet and dry) in respect to the total aerosol insisting at ground level. Furthermore, snow retains the total record of aerosol deposition after the last snow/rain event and before the sampling date. The problem is, if anything, that of discriminating between the different components of the aerosol (local, long-range transported, secondary), where present. Therefore the study of snow cannot ignore the comparative study of aerosols and local soils in order to reconstruct their origin and evolution on a local scale in the light of atmospheric circulation in the period of interest.

The relationships between snow, aerosol and local soils were investigated in Hornsund, Svalbard, in April-May 2019. This period marks the beginning of the thaw phase when atmospheric instability and variable provenance of incoming air masses typically occur. Snow, aerosol and local soils were collected during the sampling campaign and analyzed by scanning electron microscopy (SEM) on individual silicate and metal oxide Fe-bearing particles. These particles were chosen for their ability to discriminate aerosols from different contexts (e.g., Iceland rather than Greenland or N-Europe), and also because they are easily identifiable by SEM analysis due to their good contrast in back-scattered electron imaging.

The results show a large geochemical overlap of the aerosol particles with local sediments, but also a certain degree of affinity with dust of North Atlantic origin (Iceland, Greenland, British Isles). In particular, the detailed analysis of the snow samples revealed the occurrence of a strong wet deposition event on a sector of the glaciated area. Which demonstrates the ability of snow analysis of reconstructing the type (dry, wet) and the extent of aerosol deposition on the snowpack as a function of altitude and exposure conditions.
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