Evaluation of the new UKCA climate-composition model – Part I: The stratosphere

摘要

The UK Chemistry and Aerosols model is a new aerosol-chemistry model coupled to the Met Office Unified Model capable of simulating composition and climate from the troposphere to the mesosphere. Here we introduce the model and assess its performance with a particular focus on the stratosphere. A 20-year perpetual year-2000 simulation forms the basis of our analysis. We compare the model results to ERA-40 reanalyses and some observational climatologies, and also assess aspects of dynamical-chemical coupling.