Characteristics of Absorbing Aerosols in Mexico City: A Study of Morphology and Columnar Microphysical Properties

IF 2.5 4区地球科学 Q3 ENVIRONMENTAL SCIENCES

Atmosphere Pub Date : 2024-01-16 DOI:10.3390/atmos15010108

Giovanni Carabali, Faustino Juárez-Sánchez, Rafael N. Liñan-Abanto, Héctor Estévez, Mauro Valdés-Barrón, Roberto Bonifaz-Alfonso, David Riveros-Rosas, Adriana González-Cabrera

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Abstract

This paper presents an analysis of the morphology and columnar microphysical properties of atmospheric aerosols in Mexico City (MC) for the period 2022–2023. The morphological study focused on the structure description of soot particles and tar balls (TB). By transmission electron microscope (TEM) and scanning electrode microscope (SEM), voluminous soot aggregates mixed with TBs were observed. The chemistry shows that both soot and TBs are mostly carbonaceous species with well-defined morphologies. On the other hand, the columnar aerosol microphysical properties recovered from AERONET show that the particles have a bimodal aerosol size distribution (ASD) with two modes: fine and coarse. The ASD remains constant without showing significant seasonal changes, only with some variability for coarse particles. The aerosol optical depth (AOD) value is significantly high, typical of urban areas. The real (n) and imaginary (k) parts of the complex refractive index (CRI) were obtained from the photometric measurements. The CRI values show seasonal variations, with spring being the season with the highest values for n, while the highest values for k were measured in winter.

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墨西哥城吸收性气溶胶的特征：形态和柱状微物理特性研究

本文对 2022-2023 年期间墨西哥城（MC）大气气溶胶的形态和柱状微物理特性进行了分析。形态研究的重点是烟尘颗粒和焦油球（TB）的结构描述。通过透射电子显微镜（TEM）和扫描电极显微镜（SEM），观察到大量烟尘聚集体与焦油球混合在一起。化学成分显示，烟尘和 TB 大多是碳质物种，具有清晰的形态。另一方面，从 AERONET 恢复的柱状气溶胶微物理特性显示，颗粒具有双峰气溶胶粒度分布（ASD），有细和粗两种模式。气溶胶粒径分布保持不变，没有明显的季节性变化，只有粗颗粒有一些变化。气溶胶光学深度（AOD）值明显偏高，是城市地区的典型特征。复折射率（CRI）的实部（n）和虚部（k）是通过光度测量得到的。复折射率值呈现季节性变化，n 值最高的季节是春季，而 k 值最高的季节是冬季。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmosphere METEOROLOGY & ATMOSPHERIC SCIENCES-

CiteScore

4.60

自引率

13.80%

发文量

1769

审稿时长

1 months

期刊介绍： Atmosphere (ISSN 2073-4433) is an international and cross-disciplinary scholarly journal of scientific studies related to the atmosphere. It publishes reviews, regular research papers, communications and short notes, and there is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles.