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  Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall

Tang, K., Sanchez-Parra, B., Yordanova, P., Wehking, J., Backes, A. T., Pickersgill, D. A., et al. (2022). Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall. Biogeosciences, 19(1), 71-91. doi:10.5194/bg-19-71-2022.

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Tang, Kai1, Author              
Sanchez-Parra, Beatrice1, Author              
Yordanova, Petya1, Author              
Wehking, Jörn1, Author              
Backes, Anna T.2, Author              
Pickersgill, Daniel A.1, Author              
Maier, Stefanie3, Author
Sciare, Jean3, Author
Pöschl, Ulrich1, Author              
Weber, Bettina1, Author              
Fröhlich-Nowoisky, Janine1, Author              
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
2Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              
3external, ou_persistent22              

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 Abstract: Certain biological particles are highly efficient ice nuclei (IN), but the actual contribution of bioparticles to the pool of atmospheric IN and their relation to precipitation are not well characterized. We investigated the composition of bioaerosols, ice nucleation activity, and the effect of rainfall by metagenomic sequencing and freezing experiments of aerosol samples collected during the INUIT 2016 campaign in a rural dryland on the eastern Mediterranean island of Cyprus. Taxonomic analysis showed community changes related to rainfall. For the rain-affected samples, we found higher read proportions of fungi, particularly of Agaricomycetes, which are a class of fungi that actively discharge their spores into the atmosphere in response to humidity changes. In contrast, the read proportions of bacteria were reduced, indicating an effective removal of bacteria by precipitation. Freezing experiments showed that the IN population in the investigated samples was influenced by both rainfall and dust events. For example, filtration and heat treatment of the samples collected during and immediately after rainfall yielded enhanced fractions of heat-sensitive IN in the size ranges larger than 5 µm and smaller than 0.1 µm, which were likely of biological origin (entire bioparticles and soluble macromolecular bio-IN). In contrast, samples collected in periods with dust events were dominated by heat-resistant IN active at lower temperatures, most likely mineral dust. The DNA analysis revealed low numbers of reads related to microorganisms that are known to be IN-active. This may reflect unknown sources of atmospheric bio-IN as well as the presence of cell-free IN macromolecules that do not contain DNA, in particular for sizes < 0.1 µm. The observed effects of rainfall on the composition of atmospheric bioaerosols and IN may influence the hydrological cycle (bioprecipitation cycle) as well as the health effects of air particulate matter (pathogens, allergens).

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 Dates: 2022-01-05
 Publication Status: Published online
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 Identifiers: ISI: 000739722700001
DOI: 10.5194/bg-19-71-2022
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Title: Biogeosciences
  Other : Biogeosciences
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : Copernicus GmbH on behalf of the European Geosciences Union
Pages: - Volume / Issue: 19 (1) Sequence Number: - Start / End Page: 71 - 91 Identifier: ISSN: 1726-4170
CoNE: https://pure.mpg.de/cone/journals/resource/111087929276006