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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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Datensatz-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021874 Versions-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021874_1
Genre: Konferenzbeitrag

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

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Schlagwörter: -
 Zusammenfassung: 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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Sprache(n): eng - Englisch
 Datum: 2023-07-112023-07-11
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.57757/IUGG23-4445
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Veranstaltung

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Veranstaltungsort: Berlin
Start-/Enddatum: 2023-07-11 - 2023-07-20

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Genre der Quelle: Konferenzband
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Potsdam : GFZ German Research Centre for Geosciences
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