Description and evaluation of the UKCA stratosphere–troposphere chemistry scheme (StratTrop vn 1.0) implemented in UKESM1

• Published in: Geoscientific Model Development Vol. 13; no. 3; pp. 1223 - 1266
• Main Authors: Archibald, Alexander T, O'Connor, Fiona M, Abraham, Nathan Luke, Archer-Nicholls, Scott, Chipperfield, Martyn P, Dalvi, Mohit, Folberth, Gerd A, Dennison, Fraser, Dhomse, Sandip S, Griffiths, Paul T, Hardacre, Catherine, Hewitt, Alan J, Hill, Richard S, Johnson, Colin E, Keeble, James, Köhler, Marcus O, Morgenstern, Olaf, Mulcahy, Jane P, Ordóñez, Carlos, Pope, Richard J, Rumbold, Steven T, Russo, Maria R, Savage, Nicholas H, Sellar, Alistair, Stringer, Marc, Turnock, Steven T, Wild, Oliver, Zeng, Guang
• Format: Journal Article
• Language: English
• Published: Katlenburg-Lindau Copernicus GmbH 17-03-2020; Copernicus Publications
• Subjects: Aerosols; Atmosphere; Atmospheric chemistry; Atmospheric composition; Atmospheric ozone; Budgets; Comparative analysis; Computer simulation; Geoengineering; Middle atmosphere; Ozone; Simulation; Stratosphere; Troposphere; Tropospheric ozone; United Kingdom > UK
• ISSN: 1991-9603; 1991-959X; 1991-962X; 1991-9603; 1991-962X
• DOI: 10.5194/gmd-13-1223-2020

Here we present a description of the UKCA StratTrop chemical mechanism, which is used in the UKESM1 Earth system model for CMIP6. The StratTrop chemical mechanism is a merger of previously well-evaluated tropospheric and stratospheric mechanisms, and we provide results from a series of bespoke integrations to assess the overall performance of the model.