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• W2182513414 abstract "A Fast Stratospheric Aerosol Microphysical Model (SAMM) has been developed to study aerosol behaviour in the lower stratosphere. This model simulates homogeneous binary nucleation, condensational growth, coagulation, and sedimentation of sulphuric acid-water particles in order to predict the composition and size-distribution of stratospheric aerosols. The principal advantage of SAMM is that it is non-iterative, i.e. computing time is reduced by finding semi-implicit solutions to aerosol processes. Condensation and coagulation are solved using the operator-split method. Hence the effect of coagulation is determined in a single iteration. The semi-implicit solution for coagulation agrees well with Smoluchowski’s solution for a constant coagulation kernel. Similarly, starting from the fundamental growth equation, a solution for condensational growth is derived that does not require iteration. The solution conserves mass exactly, and is unconditionally stable. In SAMM, homogeneous nucleation and condensation are coupled in a manner that allows realistic competition between the two processes for the limited amount of vapour. With geometrically related size bins (around 40 bins for sulphuric acid-water particles in the range 0.3 nm to 1.5 m) and an 1800 s time-step, SAMM takes about 3 minutes CPU on a 1.4 GHz computer to calculate the background stratospheric aerosol size distribution. Hence SAMM allows aerosol processes to be included in global models for a relatively small computational expense. SAMM has been used to simulate background stratospheric aerosols and volcanically disturbed aerosol and has been shown to be in good agreement with observations and other modelling studies." @default.
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• W2182513414 date "2004-01-01" @default.
• W2182513414 modified "2023-09-27" @default.
• W2182513414 title "A Fast Stratospheric Aerosol Microphysical Model (SAMM): H SO -H O Aerosol Development and Validation" @default.
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