Dispersion and Aging of Volcanic Aerosols After the La Soufrière Eruption in April 2021

Volcanic aerosols change the atmospheric composition and thereby affect weather climate. Aerosol dynamic processes such as nucleation, condensation, coagulation modify shape, size, mass of aerosol particles, which influence their lifetime radiative properties. Nevertheless, most models omit these for ash particles. In this work, we explore aging sulfate production during first 4 days following 2021 La Soufrière (St. Vincent) eruption with ICON-ART model (ICOsahedral Nonhydrostatic Reactive Trace gases). Online coupling a one-dimensional volcanic plume calculates emission, makes it possible to resolve different phases noncontinuous eruption. We compared our simulated distribution observations from Cloud-Aerosol Lidar Orthogonal Polarization (CALIOP) instrument, Multiangle Imaging SpectroRadiometer (MISR) Research (RA) Algorithm, Barbados Cloud Observatory (BCO). show that online is essential adequately emissions development close volcano. The modeled in very good agreement MISR near emission source CALIOP at larger distances. Furthermore, particle occurs faster troposphere than stratosphere due availability water vapor OH, but layer coated appears top oxidation SO2 lofting by aerosol-radiation interaction. This paper gives direct comparison plumes between simulations observations.