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  Bioaerosols and their role as ice nucleating particles in the Arctic

Pereira Freitas, G., Adachi, K., Conen, F., Heslin-Rees, D., Radovan Krejci, R. K., Tobo, Y., Espen Yttri, K., Zieger, P. (2023): Bioaerosols and their role as ice nucleating particles in the Arctic, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4445

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021874 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021874_1
Genre: Conference Paper

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 Creators:
Pereira Freitas, Gabriel1, Author
Adachi, Kouji1, Author
Conen, Franz1, Author
Heslin-Rees, Dominic1, Author
Radovan Krejci, Radovan Krejci1, Author
Tobo, Yutaka1, Author
Espen Yttri, Karl1, Author
Zieger, Paul1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Mixed phase clouds (MPC) play an important role in the Arctic climate through their interaction with radiation. The amount of ice in MPCs determines their microphysical properties and is one of the main sources of uncertainties in models. One key parameter driving the ice content in MPC’s is the amount of available ice nucleating particles (INP) in the Arctic atmosphere. To better represent INP in models, observations that quantify and describe the properties of INP and appoint the respective sources are urgently needed. One contributor to INP in the Arctic are bioaerosols, such as bacteria or spores, which are regarded as efficient INP at high temperatures. However, their sources and presence in the Arctic are poorly understood. Within this work, we report long-term observations of bioaerosols and INP which took place at the Zeppelin Observatory, an Arctic mountain site, in the archipelago of Svalbard. Bioaerosols were identified with single-particle spectroscopic technique and were confirmed by bioaerosol tracers as well as electronic microscopy imaging. Their seasonal cycle showed elevated concentrations in summer that followed several key parameters such as ambient temperature, vegetation and snow cover, linking bioaerosols to potential local terrestrial sources. INP followed a similar seasonal cycle, exhibiting elevated concentrations of high-temperature INP in summer that closely matched the bioaerosol abundance (concentrations between 10-3-10-1 L-1). The high-temperature INP organic fraction reached levels above 90% in summer, strengthening the link to bioaerosols. In summary, we present the first direct links between bioaerosols and INP, along with their seasonality and quantification.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-4445
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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