4-4-4-4-4-4-4-4-4-4-4-4-4 From: Nicole Bobrowski <nicole.bobrowski@xxxxxxx> Dear Colleagues and friends, We invite you to submit your contribution to the next *EGU2025* session *No. GMPV8.2: Volcanic degassing.* In this session, you can submit your recent work on issues related to volcanic degassing from deep processes to atmospheric output. *The submission deadline is 15 January 2025, 13:00 CET. *For details, see session description below. Looking forward to hearing from you, *Nicole, Jonas and Marco* *Volcanic degassing* Conveners: Marco Liuzzo, *Istituto Nazionale di Geofisica e Vulcanologia, Palermo - Italy* Nicole Bobrowski, *Istituto Nazionale di Geofisica e Vulcanologia, Catania - Italy* Jonas Kuhn,* University of California, Department of Atmospheric and Oceanic Sciences, Los Angeles - United States of America* *Session details* *(**link: https://meetingorganizer.copernicus.org/EGU25/session/54224 <https://urldefense.com/v3/__https://meetingorganizer.copernicus.org/EGU25/session/54224__;!!IKRxdwAv5BmarQ!aWMSMl1Ldmv63IA3KfW54vFz78yx3xFsptHD46eUdJDg26VF3K16gR6fzUC7CxB6iFk6dFMfZtdIm0vPCJRaTfBMzw$>)* *Magma composition, eruptive frequency, and tectonic context are highly variable features of volcanoes. Within such contexts, volcanic volatiles play a key role in magma transport, and impact on the style and timing of volcanic eruptions. Gas chemical and isotopic compositions may change over time, reflecting variations in the magmatic feeding systems of volcanoes. As the magma rises from depth, the decreasing pressure allows volatile species to partition into the gas phase. Bubbles form, grow, and coalesce, and gases start to flow through the vesciculated magma. Eventually, fluid and gases reach the surface and are released into the atmosphere through soil degassing, fumarolic vents, or bubbling through a water surface, forming large plumes or explosive eruption columns.* *Volcanic emissions can also have significant impacts on the terrestrial environment, atmospheric composition, climate, and human health on various temporal and spatial scales. For instance, sulfur dioxide emissions can cause acid rain and influence aerosol formation; if an eruption column reaches the stratosphere, it may cause global dimming and a lowering of the Earthâ??s surface temperatures that may last for years. Similarly, halogens can dramatically affect proximal ecosystems, influence the oxidation capacity of the troposphere, and alter the stratospheric ozone layer.* *Understanding the physicochemical processes underlying volcanic eruptions has improved tremendously through major advances in computational and analytical capabilities, instrumentation, and monitoring networks, thereby improving the ability to reduce volcanic hazards.* *This session focuses on all aspects of volcanic volatile degassing in the Earthâ??s system through case studies and theoretical and multidisciplinary approaches. We invite contributions discussing how novel measurement techniques, field measurements, direct and remote ground and space-based observations, and modeling studies of volcanic degassing can provide new insights into volcanic and atmospheric processes from local to global scales.* *Finally, but significantly, we strongly encourage critical contributions that offer alternative explanations and viewpoints, willingness to consider new ideas supported by evidence, and with the potential to improve the ability to forecast eruptions.* 4-4-4-4-4-4-4-4-4-4-4-4-4 ------------------------------
