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CREATED:20251002T110612Z
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SUMMARY:SO Colloquium - The formation of high-altitude clouds on terrestrial planets
DESCRIPTION:The three rocky planets in the inner Solar System\, Mars\, Venus and Earth\, host many types of clouds. In particular\,​ the highest-altitude clouds forming up to 100 km above the surface are the most intriguing ones\, as they form at the edge of​ space and are rarely visible to the human eye. \nOn the Earth\, the middle atmosphere hosts a sulphuric acid aerosol layer and​ clouds formed of water ice. Both carbon dioxide ice and water ice clouds form in the Martian atmosphere. Venus is​ covered in a​ thick sulphuric acid cloud layer\, but above that\, water or carbon dioxide ice clouds might form in certain conditions. In addition t​o the necessary ingredient in the form of a​ condensable vapour\, one of the keys to cloud formation is pre-existing particles called condensation nuclei. \nPlanet surfaces provide a good source of particles (such as mineral dust\, biogenic aerosols\, sea salt\,​ pollution). However\, particles from a surface source cannot reach very high altitudes in large amounts and thus another source\,​ such as meteorites\, is required in the middle atmosphere. This presentation will provide an overview of the recent advances on​ high-altitude cloud formation on the three planets\, and show some images of the thin high-altitude​ clouds we actually can see. It​ will also discuss links between the processes and highlight the remaining open questions. \nFecha y lugar: 26/03/2026 – 12:30 | Salón de ActosAnni MäättänenLATMOS laboratory\, Centre national de la recherche scientifique (CNRS) \n  \n 
URL:https://www.iaa.csic.es/evento/the-formation-of-high-altitude-clouds-on-terrestrial-planets/
LOCATION:IAA – CSIC\, Glorieta de la Astronomía\, Granada\, España
CATEGORIES:SO Colloquium
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