{"id":15431,"date":"2025-05-16T16:14:43","date_gmt":"2025-05-16T14:14:43","guid":{"rendered":"https:\/\/blueark.ch\/?post_type=nomination&#038;p=15367"},"modified":"2025-05-18T17:38:26","modified_gmt":"2025-05-18T15:38:26","slug":"biological-particles-may-be-crucial-for-inducing-heavy-rain","status":"publish","type":"post","link":"https:\/\/blueark.ch\/de\/biological-particles-may-be-crucial-for-inducing-heavy-rain\/","title":{"rendered":"Biological particles may be crucial for inducing heavy rain"},"content":{"rendered":"\n<p>EPFL atmospheric and climate scientists show that biological particles may induce rain events that could contribute to flooding and snowstorms, owing to their ability to precipitate ice formation in clouds. They call for an update of meteorological and climate models.<\/p>\n\n\n\n<p>Clouds form upon existing particles in the atmosphere, and extreme weather events like flooding and snowstorms are related to production of large amounts of ice in clouds. EPFL climate scientists show that biological particles like pollen, bacteria, spores and plant matter floating in the air are particularly good at promoting ice formation in clouds, and that these particles concentrations evolve as temperatures rise and fall. The results <a href=\"https:\/\/doi.org\/10.1038\/s41612-024-00817-9\">are published in the Nature Portofolio Journal <em>Climate and Atmospheric Sciences<\/em><\/a>.<\/p>\n\n\n\n<p>\u201cBiological particles are very effective at forming ice in clouds, and the formation of ice is responsible for most of the precipitation the planet receives worldwide, because ice falls very quickly from the sky. Intense ice formation is also associated with extreme weather,\u201d explains Thanos (Athanasios) Nenes of EPFL\u2019s <a href=\"https:\/\/www.epfl.ch\/labs\/lapi\/\">Laboratory of atmospheric processes and their impacts<\/a>, whom lead the study together with postdoctoral researcher Kunfeng Gao. \u201cGiven our findings, weather and climate models absolutely need to take biological particles into account, especially since biological particles are expected to be present in larger amounts in the atmosphere as the climate warms up.\u201d<\/p>\n\n\n\n<p>Indeed, current meteorological and climate models do not consider the effects of biological particles nor their cyclical nature, which means that they are potentially missing important modulators of clouds and drivers of precipitation in the current and future climate forecasts.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/actu.epfl.ch\/public\/upload\/fckeditorimage\/93\/05\/f46e049e.jpg\" alt=\"\"\/><figcaption class=\"wp-element-caption\">CHOPIN campaign scientists at the NCSR Demokritos (HAC)2 station at Mt.Helmos. Credit A.Nenes. 2025 CleanCloud\/CHOPIN\/EPFL CC-BY-SA 4.0<\/figcaption><\/figure>\n\n\n\n<p><strong>Mount Helmos, a case study for alpine regions<\/strong><\/p>\n\n\n\n<p>The study takes in account air samples and their biological content collected at Mount Helmos, an alpine area located in Greece. The mountain reaches an altitude of 2350m, has frequent cloud cover throughout the year, and is influenced by biological emissions from the alpine forest below. As temperatures rise throughout the day, pollen, bacteria, fungal spores and plant matter are released from the alpine forest, culminating midday when the sun is at its highest and reaching lows during the night.<\/p>\n\n\n\n<p>\u201cWe find that the number of particles that can nucleate ice coincides with the number of biological particle counts and they both show strongly correlated diurnal periodicity, and the increased biological particles may contribute to cloud formation that can make them precipitate,\u201d concludes Gao.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/actu.epfl.ch\/public\/upload\/fckeditorimage\/08\/ef\/313efc1c.jpg\" alt=\"\"\/><figcaption class=\"wp-element-caption\">Instrumentation that remotely sense clouds, particles and winds at Mt.Helmos. Credit A.Nenes. 2025 CleanCloud\/CHOPIN CC-BY-SA 4.0<\/figcaption><\/figure>\n\n\n\n<p>Nenes, who participated at the IPCC scoping meeting in Malaysia to help define the chapters and shape the contents of the 7th IPCC Assessment Report, says, \u201cthe result comes with perfect timing.\u201d As scientific coordinator of the large European project <a href=\"https:\/\/projects.au.dk\/cleancloud\">CleanCloud<\/a>, Nenes is currently leading a second campaign at Mount Helmos, called <a href=\"http:\/\/go.epfl.ch\/chopin-campaign\">CHOPIN<\/a>, which benefits from even more instrumentation to help identify the types of biological particles present in the atmosphere that induce cloud droplet and ice formation. A full suite of cloud radars, aerosol lidars, UAVs, tethered balloons and direct sampling of air (with and without clouds) is used to characterize \u2013 with unprecedented detail \u2013 how each biological particle contributes to cloud formation , and which ones are the most effective at doing so, in order to improve weather and climate predictions.<\/p>\n\n\n\n<p>Nenes adds, \u201cThe data collected will not only be used for process understanding and model improvement, but also to improve or develop new algorithms used by satellites and ground-based remote sensing to study aerosols and clouds. We and the CleanCloud consortium as a whole will be working with the European Space Agency and our sister consortia CERTAINTY and AIRSENSE to help make the best use of the recently launched EarthCare satellite with the ultimate goal of understanding the role of aerosols on clouds and precipitation in a post-fossil world.\u201d<\/p>\n\n\n\n<p><strong>References<\/strong><\/p>\n\n\n\n<p>Gao, K., Vogel, F., Foskinis, R. et al. On the drivers of ice nucleating particle diurnal variability in Eastern Mediterranean clouds. npj Clim Atmos Sci 8, 160 (2025). <a href=\"https:\/\/doi.org\/10.1038\/s41612-024-00817-9\">https:\/\/doi.org\/10.1038\/s41612-024-00817-9<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<p class=\"pf-source-statement\">Source: <a pf-nom-item-id=\"15367\" href=\"https:\/\/actu.epfl.ch\/news\/biological-particles-may-be-crucial-for-inducing-h\/\" target=\"_blank\">Biological particles may be crucial for inducing heavy rain<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>EPFL atmospheric and climate scientists show that biological particles may induce rain events that could contribute to flooding and snowstorms, owing to their ability to precipitate ice formation in clouds. They call for an update of meteorological and climate models. Clouds form upon existing particles in the atmosphere, and extreme weather events like flooding and [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":15371,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"item_id":"f92815ea44378a5a33ad0b23b6d5073d","pf_source_link":"https:\/\/actu.epfl.ch\/news\/biological-particles-may-be-crucial-for-inducing-h\/","item_date":"","item_author":"","item_link":"https:\/\/actu.epfl.ch\/news\/biological-particles-may-be-crucial-for-inducing-h\/","item_feat_img":"https:\/\/actu.epfl.ch\/image\/154181\/1440x810.jpg","item_wp_date":"","item_tags":"","source_publication_name":"","source_publication_url":"","nomination_count":"1","sortable_item_date":"1747403324","item_description":"","pf_word_count":"","pf_forward_to_origin":"forward","footnotes":""},"categories":[1,87],"tags":[106],"class_list":["post-15431","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classifiee","category-ressourcen","tag-via-bookmarklet"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Biological particles may be crucial for inducing heavy rain - P\u00f4le d&#039;innovation BlueArk Entremont<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blueark.ch\/de\/biological-particles-may-be-crucial-for-inducing-heavy-rain\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Biological particles may be crucial for inducing heavy rain\" \/>\n<meta property=\"og:description\" content=\"EPFL atmospheric and climate scientists show that biological particles may induce rain events that could contribute to flooding and snowstorms, owing to their ability to precipitate ice formation in clouds. 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