1. Implementation of U.K. Earth system models for CMIP6
- Author
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Jamie Kettleborough, Nathan Luke Abraham, Harry Shepherd, Jonny Williams, Timothy Andrews, Irina Linova-Pavlova, Chris D. Jones, Sungbo Shim, Alistair Sellar, Alexander T. Archibald, L. K. Gohar, Mark Elkington, Erica Neininger, Steven C. Hardiman, Olaf Morgenstern, Harold Dyson, Colin Jones, Jon Seddon, Jeremy Walton, Lee de Mora, Jean-Christophe Rioual, Martin B. Andrews, Eddy Robertson, Jeff Ridley, Alan Iwi, Paul T. Griffiths, Ben Johnson, Douglas I. Kelley, Jeff Knight, Richard Wood, Emma Hogan, Malcolm J. Roberts, Spencer Liddicoat, Piotr Florek, Richard J. Ellis, Andy Wiltshire, Ruth Petrie, Till Kuhlbrodt, Stephen Haddad, Jane Mulcahy, Peter Good, Miroslaw Andrejczuk, Joao C. Teixiera, Ag Stephens, Fiona M. O'Connor, S. T. Rumbold, Yongming Tang, Matthew S. Mizielinski, and Marcus O. Köhler
- Subjects
Scheme (programming language) ,010504 meteorology & atmospheric sciences ,Computer science ,010502 geochemistry & geophysics ,01 natural sciences ,Ecology and Environment ,Atmospheric Sciences ,Interpretation (model theory) ,lcsh:Oceanography ,Environmental Chemistry ,lcsh:GC1-1581 ,Boundary value problem ,Robustness (economics) ,lcsh:Physical geography ,0105 earth and related environmental sciences ,computer.programming_language ,Global and Planetary Change ,Coupled model intercomparison project ,Forcing (recursion theory) ,Industrial engineering ,Earth system science ,13. Climate action ,General Earth and Planetary Sciences ,Tropopause ,lcsh:GB3-5030 ,computer - Abstract
We describe the scientific and technical implementation of two models for a core set of\ud experiments contributing to the sixth phase of the Coupled Model Intercomparison Project (CMIP6).\ud The models used are the physical atmosphere-land-ocean-sea ice model HadGEM3-GC3.1 and the\ud Earth system model UKESM1 which adds a carbon-nitrogen cycle and atmospheric chemistry to\ud HadGEM3-GC3.1. The model results are constrained by the external boundary conditions (forcing data)\ud and initial conditions.We outline the scientific rationale and assumptions made in specifying these.\ud Notable details of the implementation include an ozone redistribution scheme for prescribed ozone\ud simulations (HadGEM3-GC3.1) to avoid inconsistencies with the model's thermal tropopause, and land use\ud change in dynamic vegetation simulations (UKESM1) whose influence will be subject to potential biases in\ud the simulation of background natural vegetation.We discuss the implications of these decisions for\ud interpretation of the simulation results. These simulations are expensive in terms of human and CPU\ud resources and will underpin many further experiments; we describe some of the technical steps taken to\ud ensure their scientific robustness and reproducibility.
- Published
- 2020