Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall
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 rain...
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Copernicus Publications
2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00059794 2024-09-09T19:48:21+00:00 Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall Tang, Kai Sánchez-Parra, Beatriz Yordanova, Petya Wehking, Jörn Backes, Anna T. Pickersgill, Daniel A. Maier, Stefanie Sciare, Jean Pöschl, Ulrich Weber, Bettina Fröhlich-Nowoisky, Janine 2022-01 electronic https://doi.org/10.5194/bg-19-71-2022 https://noa.gwlb.de/receive/cop_mods_00059794 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059443/bg-19-71-2022.pdf https://bg.copernicus.org/articles/19/71/2022/bg-19-71-2022.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-19-71-2022 https://noa.gwlb.de/receive/cop_mods_00059794 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059443/bg-19-71-2022.pdf https://bg.copernicus.org/articles/19/71/2022/bg-19-71-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/bg-19-71-2022 2024-06-26T04:34:57Z 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). Article in Journal/Newspaper inuit Niedersächsisches Online-Archiv NOA Biogeosciences 19 1 71 91 |
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Niedersächsisches Online-Archiv NOA |
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article Verlagsveröffentlichung Tang, Kai Sánchez-Parra, Beatriz Yordanova, Petya Wehking, Jörn Backes, Anna T. Pickersgill, Daniel A. Maier, Stefanie Sciare, Jean Pöschl, Ulrich Weber, Bettina Fröhlich-Nowoisky, Janine Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall |
topic_facet |
article Verlagsveröffentlichung |
description |
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). |
format |
Article in Journal/Newspaper |
author |
Tang, Kai Sánchez-Parra, Beatriz Yordanova, Petya Wehking, Jörn Backes, Anna T. Pickersgill, Daniel A. Maier, Stefanie Sciare, Jean Pöschl, Ulrich Weber, Bettina Fröhlich-Nowoisky, Janine |
author_facet |
Tang, Kai Sánchez-Parra, Beatriz Yordanova, Petya Wehking, Jörn Backes, Anna T. Pickersgill, Daniel A. Maier, Stefanie Sciare, Jean Pöschl, Ulrich Weber, Bettina Fröhlich-Nowoisky, Janine |
author_sort |
Tang, Kai |
title |
Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall |
title_short |
Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall |
title_full |
Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall |
title_fullStr |
Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall |
title_full_unstemmed |
Bioaerosols and atmospheric ice nuclei in a Mediterranean dryland: community changes related to rainfall |
title_sort |
bioaerosols and atmospheric ice nuclei in a mediterranean dryland: community changes related to rainfall |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-71-2022 https://noa.gwlb.de/receive/cop_mods_00059794 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059443/bg-19-71-2022.pdf https://bg.copernicus.org/articles/19/71/2022/bg-19-71-2022.pdf |
genre |
inuit |
genre_facet |
inuit |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-19-71-2022 https://noa.gwlb.de/receive/cop_mods_00059794 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059443/bg-19-71-2022.pdf https://bg.copernicus.org/articles/19/71/2022/bg-19-71-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-19-71-2022 |
container_title |
Biogeosciences |
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19 |
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1 |
container_start_page |
71 |
op_container_end_page |
91 |
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1809917650326781952 |