Preprints
https://doi.org/10.5194/egusphere-2024-1390
https://doi.org/10.5194/egusphere-2024-1390
11 Jul 2024
 | 11 Jul 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Technical note: Quantified organic aerosol subsaturated hygroscopicity by a simple optical scatter monitor system through field measurements

Jie Zhang, Tianyu Zhu, Alexandra Catena, Yaowei Li, Margaret Schwab, Pengfei Liu, Akua Asa-Awuku, and James Schwab

Abstract. The hygroscopicity of organic aerosol (κOA) plays a crucial role in cloud droplet activation and aerosol-radiation interactions. This study investigated the viability of an optical scatter monitor system, featuring two nephelometric monitors (pDR-1500), to determine κOA, after knowing the aerosol chemical composition. This system was operated during a mobile lab deployment on Long Island in the summer of 2023, which was executed to coordinate with the Atmospheric Emissions and Reactions Observed from Megacities to Marine Areas (AEROMMA) field campaign. The derived κOA under subsaturated high humidity conditions (RH between 85 % and 95 %) were categorized based on different aerosol sources, including wildfire aerosol, urban aerosol, and aerosol from rural conditions. The κOA and the OA O:C ratio exhibited linear positive relationships for the urban aerosol and the aerosol from rural conditions, with a much higher slope (0.50 vs. 0.24) for the latter. However, there was no clear relationship between κOA and the OA O/C ratio observed during each period affected by wildfire plumes. The system proposed here could be widely applied alongside the current aerosol component measurement systems, providing valuable insights into the large-scale spatial and temporal variations of OA hygroscopicity.

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Jie Zhang, Tianyu Zhu, Alexandra Catena, Yaowei Li, Margaret Schwab, Pengfei Liu, Akua Asa-Awuku, and James Schwab

Status: open (until 22 Aug 2024)

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Jie Zhang, Tianyu Zhu, Alexandra Catena, Yaowei Li, Margaret Schwab, Pengfei Liu, Akua Asa-Awuku, and James Schwab
Jie Zhang, Tianyu Zhu, Alexandra Catena, Yaowei Li, Margaret Schwab, Pengfei Liu, Akua Asa-Awuku, and James Schwab

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Short summary
This study shows the derived organic aerosol hygroscopicity under high humidity conditions based on a simple optical scatter monitor system, including two nephelometric monitors (pDR-1500), after knowing the aerosol chemical composition.