Implementation of U.K. Earth system models for CMIP6

Sellar, Alistair A.; Walton, Jeremy; Jones, Colin G.; Wood, Richard; Abraham, Nathan Luke; Andrejczuk, Miroslaw; Andrews, Martin B.; Andrews, Timothy; Archibald, Alex T.; de Mora, Lee; Dyson, Harold; Elkington, Mark; Ellis, Richard; Florek, Piotr; Good, Peter; Gohar, Laila; Haddad, Stephen; Hardiman, Steven C.; Hogan, Emma; Iwi, Alan; Jones, Christopher D.; Johnson, Ben; Kelley, Douglas I. ORCID:; Kettleborough, Jamie; Knight, Jeff R.; Köhler, Marcus O.; Kuhlbrodt, Till; Liddicoat, Spencer; Linova‐Pavlova, Irina; Mizielinski, Matthew S.; Morgenstern, Olaf; Mulcahy, Jane; Neininger, Erica; O'Connor, Fiona M.; Petrie, Ruth; Ridley, Jeff; Rioual, Jean‐Christophe; Roberts, Malcolm; Robertson, Eddy; Rumbold, Steven; Seddon, Jon; Shepherd, Harry; Shim, Sungbo; Stephens, Ag; Teixiera, Joao C.; Tang, Yongming; Williams, Jonny; Wiltshire, Andy; Griffiths, Paul T.. 2020 Implementation of U.K. Earth system models for CMIP6. Journal of Advances in Modeling Earth Systems, 12 (4), e2019MS001946. 27, pp.

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We describe the scientific and technical implementation of two models for a core set of experiments contributing to the sixth phase of the Coupled Model Intercomparison Project (CMIP6). The models used are the physical atmosphere‐land‐ocean‐sea ice model HadGEM3‐GC3.1 and the Earth system model UKESM1 which adds a carbon‐nitrogen cycle and atmospheric chemistry to HadGEM3‐GC3.1. The model results are constrained by the external boundary conditions (forcing data) and initial conditions. We outline the scientific rationale and assumptions made in specifying these. Notable details of the implementation include an ozone redistribution scheme for prescribed ozone simulations (HadGEM3‐GC3.1) to avoid inconsistencies with the model's thermal tropopause, and land use change in dynamic vegetation simulations (UKESM1) whose influence will be subject to potential biases in the simulation of background natural vegetation. We discuss the implications of these decisions for interpretation of the simulation results. These simulations are expensive in terms of human and CPU resources and will underpin many further experiments; we describe some of the technical steps taken to ensure their scientific robustness and reproducibility.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Hydro-climate Risks (Science Area 2017-)
ISSN: 1942-2466
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Date made live: 03 Apr 2020 11:12 +0 (UTC)

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