Background Free-Tropospheric Ice Nucleating Particle Concentrations at Mixed-Phase Cloud Conditions

Lacher, Larissa and DeMott, Paul J. and Levin, Ezra J. T. and Suski, Kaitlyn J. and Boose, Yvonne and Zipori, Assaf and Herrmann, Erik and Bukowiecki, Nicolas and Steinbacher, Martin and Gute, Ellen and Abbatt, Jonathan P. D. and Lohmann, Ulrike and Kanji, Zamin A.. (2018) Background Free-Tropospheric Ice Nucleating Particle Concentrations at Mixed-Phase Cloud Conditions. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 123 (18). pp. 10506-10525.

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Official URL: https://edoc.unibas.ch/73981/

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Clouds containing ice are vital for precipitation formation and are important in determining the Earth's radiative budget. However, primary formation of ice in clouds is not fully understood. In the presence of ice nucleating particles (INPs), the phase change to ice is promoted, but identification and quantification of INPs in a natural environment remains challenging because of their low numbers. In this paper, we quantify INP number concentrations in the free troposphere (FT) as measured at the High Altitude Research Station Jungfraujoch (JFJ), during the winter, spring, and summer of the years 2014-2017. INPs were measured at conditions relevant for mixed-phase cloud formation at T=241/242 K. To date, this is the longest timeline of semiregular measurements akin to online INP monitoring at this site and sampling conditions. We find that INP concentrations in the background FT are on average capped at 10/stdL (liter of air at standard conditions [T=273 K and p=1013 hPa]) with an interquartile range of 0.4-9.6/stdL, as compared to measurements during times when other air mass origins (e.g., Sahara or marine boundary layer) prevailed. Elevated concentrations were measured in the field campaigns of 2016, which might be due to enhanced influence from Saharan dust and marine boundary layer air arriving at the JFJ. The upper limit of INP concentrations in the background FT is supported by measurements performed at similar conditions, but at different locations in the FT, where we find INP concentrations to be below 13/stdL most of the time.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Atmospheric Sciences (Kalberer)
UniBasel Contributors:Bukowiecki, Nicolas
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:03 Apr 2020 14:44
Deposited On:03 Apr 2020 14:44

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