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Stratospheric aerosols play an important role in the climate\udsystem by affecting the Earth's radiative budget as well as atmospheric\udchemistry, and the capabilities to simulate them interactively within global\udmodels are continuously improving. It is important to represent accurately\udboth aerosol microphysical and atmospheric dynamical processes because\udtogether they affect the size distribution and the residence time of the\udaerosol particles in the stratosphere. The newly developed LMDZ-S3A model\udpresented in this article uses a sectional approach for sulfate particles in\udthe stratosphere and includes the relevant microphysical processes. It allows\udfull interaction between aerosol radiative effects (e.g. radiative heating)\udand atmospheric dynamics, including e.g. an internally generated\udquasi-biennial oscillation (QBO) in the stratosphere. Sulfur chemistry is\udsemi-prescribed via climatological lifetimes. LMDZ-S3A reasonably reproduces\udaerosol observations in periods of low (background) and high (volcanic)\udstratospheric sulfate loading, but tends to overestimate the number of small\udparticles and to underestimate the number of large particles. Thus, it may\udserve as a tool to study the climate impacts of volcanic eruptions, as well\udas the deliberate anthropogenic injection of aerosols into the stratosphere,\udwhich has been proposed as a method of geoengineering to abate global\udwarming

geoscientific model development

The Sectional Stratospheric Sulfate Aerosol module (S3A-v1) within the LMDZ general circulation model: description and evaluation against stratospheric aerosol observations