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Vertical wind tunnel study on retention of secondary organic aerosol precursors

Authors

Gautam,  Martanda
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Borchers,  Christine
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Seymore,  Jackson
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Dörholt,  Konstantin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gömmer,  Laura
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Arndt,  Andreas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Theis,  Alexander
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Vogel,  Alexander
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hoffmann,  Thorsten
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Borrmann,  Stephan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Szakáll,  Miklós
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Gautam, M., Borchers, C., Seymore, J., Dörholt, K., Gömmer, L., Arndt, A., Theis, A., Vogel, A., Hoffmann, T., Borrmann, S., Szakáll, M. (2023): Vertical wind tunnel study on retention of secondary organic aerosol precursors, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2423


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018329
Abstract
The importance of Secondary Organic Aerosols (SOA) in cloud systems and their impact on Earth’s climate, specifically in the Upper Troposphere (UT) region has been well studied. During convective updraft from the boundary layer to the UT, the volatility of SOA precursors reduces along its ascent which in turn facilitates its formation pathway. However, the fate of different SOA precursors varies depending on their molecular structure, Henry’s Law solubility constant, as well as the ambient environmental conditions like temperature, updraft speed and liquid water content. For instance, in the mixed-phase region of convective clouds, SOA precursors can dissolve into cloud droplets and be transported further up in the atmosphere. Subsequent freezing of these droplets can lead to partial retention of the precursors in the ice phase, which can be quantified with a retention coefficient. Therefore, we conducted riming experiments in the vertical wind tunnel at the Johannes Gutenberg University of Mainz, Germany, under simulated conditions similar to those prevailing in a natural convective cloud. The temperatures ranged from -10 to -3 oC, the updraft speed from 3 to 6 m/s, and the liquid water content varied from 1 to 2 g/m3 to simulate both dry and wet growth conditions. Here we present the results for retention coefficients for SOA precursors such as pinonic acid, pinic acid, 2-nitrophenol, and a nitrophenol mixture. All the measurements were conducted as a single component experimental setup except for the nitrophenol mixture.