Workshop report: Modelling volatile behaviour in magmas

Volatiles are a critical component of magmas, driving volcanic eruptions, creating and modifying planetary atmospheres, and generating ore deposits. There has been an immense amount of work quantifying the solubility of individual volatile species in a wide variety of magma compositions and the creation of various modelling capabilities to look at magmatic degassing. This workshop aimed to bring together experimentalists, numerical modellers, and observational researchers with an interest in volatile solubility in magmas. Through group discussions, model demonstrations, and keynote talks, we explored the current landscape and looked for future directions. We started with a demonstration session of existing models and codes. There is currently no benchmarking for such codes, so we discussed options for a benchmarking exercise and test datasets. This was followed by discussions on future directions, covering: 1. What are the experimental gaps (e.g., melt compositions, volatile species, pressure-temperature (PT) ranges, fugacity coefficients, non-ideal mixing, etc.)?2. What do observational researchers need these codes to be able to do? 3. Can we link monitoring needs to solubility outputs?