Preprints
https://doi.org/10.5194/acp-2022-346
https://doi.org/10.5194/acp-2022-346
 
08 Jun 2022
08 Jun 2022
Status: this preprint is currently under review for the journal ACP.

Hybrid Water Adsorption and Solubility Partitioning for Aerosol Hygroscopicity and Droplet Growth

Kanishk Gohil1, Chun-Ning Mao1, Dewansh Rastogi1, Chao Peng3,4, Mingjin Tang3,4,5, and Akua Asa-Awuku1,2 Kanishk Gohil et al.
  • 1Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742 USA
  • 2Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742 USA
  • 3State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • 4CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China
  • 5University of Chinese Academy of Sciences, Beijing 100049, China

Abstract. In this work, we studied the Cloud Condensation nuclei (CCN) activity and subsaturated droplet growth of Phthalic acid (PTA), isophthalic acid, (IPTA) and terephthalic acid (TPTA), significant benzene polycarboxylic acids and structural isomers found in the atmosphere. Köhler Theory can be effectively applied for hygroscopicity analysis of PTA due to its higher aqueous solubility compared to IPTA and TPTA. As with other hygroscopicity studies of partially water-soluble and effectively water insoluble species, the supersaturated and subsaturated hygroscopicity derived from (KT) principles do not agree. To address the disparities in the sub- and supersaturated droplet growth, we developed a new analytical framework called the Hybrid Activity Model (HAM). HAM incorporates the aqueous solubility of a solute within an adsorption-based activation framework. Frenkel-Halsey-Hill (FHH)-Adsorption Theory (FHH-AT) was combined with the aqueous solubility of the compound to develop HAM. Analysis from HAM was validated using laboratory measurements of pure PTA, IPTA, TPTA and PTA-IPTA internal mixtures. Furthermore, the results generated using HAM were tested against traditional KT and FHH-AT to compare their water uptake predictive capabilities. A single-hygroscopicity parameter was also developed based on the HAM framework. Results show that the HAM based hygroscopicity parameter based can successfully simulate the water uptake behavior of the pure and internally mixed samples. Results indicate that the HAM framework may be applied to atmospheric aerosols of varying chemical structures and aqueous solubility.

Kanishk Gohil et al.

Status: open (until 20 Jul 2022)

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  • RC1: 'Comment on acp-2022-346', Anonymous Referee #1, 01 Jul 2022 reply

Kanishk Gohil et al.

Kanishk Gohil et al.

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Short summary
The Hybrid Activity Model is a promising new droplet growth model that can be potentially used for the analysis of any type of atmospheric compound. HAM may potentially improve the representation of hygroscopicity of organic aerosols in large-scale Global Climate Models (GCMs), hence reducing the uncertainties in the climate forcing due to the aerosol indirect effect.
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