Gas ash-particle separation and the role of particle aggregation in volcanic plumes

将使用一个复杂的数值羽流模型来描述和量化火山喷发羽流中火山气体和颗粒的命运。该项目的总体目标是改进和扩展现有的一维火山羽流模型，通过包括沉积等关键过程，更好地捕捉这种羽流的多相性质。简单的积分羽流模型已经在初始化用于火山灰云业务预报的大气扩散模型方面发挥了重要作用，该项目将对未来的火山风险管理产生明显的实际效益。该项目将利用一个专门为火山羽流三维模拟设计的模型，即ActiveTracer高分辨率大气模型。该项目的第一部分将涉及灰聚集模块的开发，以纳入带电灰颗粒的影响。这将使新的研究沉淀和聚集的影响。研究结果将用于改进英国气象局用于灰云预测的模型。

A complex numerical plume model will be used to characterize and quantify the fate of volcanic gases and particles involcanic eruption plumes. The overall aim of the project is to improve and extend existing one-dimensional volcanicplume models to better capture the multiphase nature of such plumes by including critical processes such assedimentation. Simple integral plume models already play an important role in initialising atmospheric dispersion modelsfor operational forecasting of volcanic ash clouds, and this project will have clear practical benefits for future volcanic riskmanagement. This project will make use of a model specifically designed for 3D simulation of volcanic plumes, the ActiveTracer High-resolution Atmospheric Model (ATHAM). The first part of the project will involve development of the ashaggregation module to incorporate the effects of electrically-charged ash particles. This will then enable novel studies ofthe effects of sedimentation and aggregation. Findings will be used to improve models used at the Met Office foroperational ash cloud forecasting.