OPEN ACCESS

Articles online

Mixed Chloride Aerosols and their Atmospheric Implications: A Review

Category: Aerosol and Atmospheric Chemistry

Volume: 17 | Issue: 4 | Pages: 878-887
DOI: 10.4209/aaqr.2016.09.0383
PDF | RIS | BibTeX

Hao Wang1, Xinfeng Wang 1, Xue Yang1, Weijun Li1, Likun Xue1, Tao Wang1,2, Jianmin Chen1, Wenxing Wang1

  • 1 Environment Research Institute, Shandong University, Ji’nan, China
  • 2 Department of Civil and Environmental Engineering, the Hong Kong Polytechnic University, Hong Kong, China

Highlights

Large amounts of chloride aerosols internally mixed with other constituents.
Mixing patterns of chloride aerosols and the atmospheric impacts are complex.
Mixing with organics suppress the hygroscopicity, CCN activation, and reactivity.


Abstract

Natural and anthropogenic chloride aerosols make up a significant fraction of atmospheric particulate matter and play important roles in the boundary layer chemistry. Here we provide a review of the mixing characteristics of chloride aerosols and the subsequent atmospheric implications, which are rarely considered in current field and modeling studies. Single-particle analytical techniques have shown that a large fraction of chlorides mix internally with other components, in particular inorganic salts and organic matters, instead of existing separately. In marine and coastal regions, high proportions of chloride aerosols usually mix with inorganic substances (e.g., Mg, Ca, K, N, S), while small quantities of them are coated by organic matter. In forest, grassland, and agricultural areas, most chlorides in biomass burning particles mix with or are coated by organics. In industrialized urban areas, the chloride aerosols often co-exist with heavy/transition metals (e.g., Zn, Pb) and are coated by organic materials in aged plumes. Moreover, secondary chlorides also mix with mineral dusts, nitrates, and sulfates. The mixing of chloride aerosols with insoluble substances can inhibit their hygroscopic properties, which in turn affects the cloud condensation nuclei activation and heterogeneous reactivity. The encasing of chloride aerosols within light-absorbing substances changes their optical properties and subsequently causes atmospheric warming. This paper emphasizes the complexity of the mixing of chloride aerosols, as well as the potential atmospheric implications thereof, and proposes some research topics deserving future study.

Keywords

Chloride aerosol Mixing state Hygroscopicity Reactivity Optical properties


Related Article

Aromatic Hydrocarbons and Halocarbons at a Mountaintop in Southern China

Minmin Yang, Yan Wang , Jianmin Chen , Hongli Li, Yuhua Li
Volume: 16 | Issue: 3 | Pages: 478-491
DOI: 10.4209/aaqr.2015.03.0197
PDF

Seasonal Variations of Atmospheric Particulate Matter and its Content of Heavy Metals in Klang Valley, Malaysia

Rasheida E. Elhadi, Ahmad Makmom Abdullah , Abdul Halim Abdullah, Zulfa Hanan Ash’aari, Md Firoz Khan
Accepted Manuscripts
DOI: 10.4209/aaqr.2017.03.0113
PDF

Radiative Forcing of Carbonaceous Aerosols over Two Urban Environments in Northern India

Abhilash S. Panicker , Rathod Aditi, Gufran Beig, Kaushar Ali, Fabien Solmon
Accepted Manuscripts
DOI: 10.4209/aaqr.2017.01.0056
PDF
;