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Please note that this session was withdrawn and is no longer available in the respective programme. This withdrawal might have been the result of a merge with another session.

GMPV4.7

Volcanoes in a changing cryosphere: physical processes and related risk (co-organized)
Convener: Gioachino Roberti  | Co-Conveners: Swetha Venugopal , Brent Ward , glyn williams-jones , Iestyn Barr , Matteo Spagnolo , Carolina Pagli , Brice Rea 
Climate change and the present warming is reducing snow, ice cover, and permafrost from volcanoes around the world. This cryosphere reduction leads to changes in the hydrological balance and removes mass from volcanoes. Consequences are changes to water resources, increased slope instability (e.g. landslides), depressurization of magmatic systems and changes to hydrothermal systems.For example, glacier retreat is exposing hydrothermal vents and glacial meltwater feeds hydrothermal circulation changing pressure, temperature and chemistry. The meltwater can also increase pore water pressures in unstable slopes of fractured and altered volcanic materials. Increasing water pressure in volcano flanks can lead to very large landslides like at Mount Meager in Canada in 2010.Decompression from both ice loss and landslides can have deep effects on the stress field and eventually destabilize and alter both hydrothermal and magmatic systems. Regional deglaciation has affected volcanoes in the past providing complex records of volcano-ice interactions. However, we are far from understanding these and more local deglaciation processes and how today’s climate change will affect volcanoes. Also, these hazards are not well appreciated by communities and governments around the affected areas, leading to uncertainty and increased risk. In this session, we aim to bring together scientists from glaciology, volcanology, geomorphology and natural hazards, as well as administrators from affected areas. We invite contributions that involve studies on present and past climate change on active and dormant volcanoes. Field and remote surveys as well as conceptual, numerical or analogue simulations of volcanic response to deglaciation especially from a stability, hydrological, geochemical and social point of view are welcome. The aim of the session is to then come up with a simplified coherent model for volcano deglaciation that can be transmitted to affected areas, and used as a basis for dialogue between the scientific community and stakeholders.