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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-130
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-130
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 14 Jun 2019

Submitted as: model description paper | 14 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

The first Met Office Unified Model/JULES Regional Atmosphere and Land configuration, RAL1

Mike Bush1, Tom Allen1, Caroline Bain1, Ian Boutle1, John Edwards1, Anke Finnenkoetter1, Charmaine Franklin2, Kirsty Hanley1, Humphrey Lean1, Adrian Lock1, James Manners1, Marion Mittermaier1, Cyril Morcrette1, Rachel North1, Jon Petch1, Chris Short1, Simon Vosper1, David Walters1, Stuart Webster1, Mark Weeks1, Jonathan Wilkinson1, Nigel Wood1, and Mohamed Zerroukat1 Mike Bush et al.
  • 1Met Office, FitzRoy Road, Exeter, EX1 3PB, UK
  • 2Bureau of Meteorology (BoM), Melbourne, Victoria, Australia

Abstract. In this paper we define the first "Regional Atmosphere and Land" (RAL) science configuration for kilometre scale modelling using the UM and JULES. "RAL1" defines the science configuration of the dynamics and physics schemes of the atmosphere and land. This configuration will provide a model baseline for any future weather or climate model developments to be described against and it is the intention that from this point forward significant changes to the system will be documented in literature. This is reproducing the process used for global configurations of the UM which was first documented as a science configuration in 2011. While it is our goal to have a single defined configuration of the model that performs effectively in all regions, this has not yet been possible. Currently we define two sub-releases, one for mid-latitudes (RAL1-M) and one for tropical regions (RAL1-T). The differences between RAL1-M and RAL1-T are documented and where appropriate, we define how the model configuration relates to the corresponding configuration of the global forecasting model.

Mike Bush et al.
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Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Mike Bush et al.
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Short summary
In this paper we define the first Met Office Unified Model/JULES Regional Atmosphere and Land configuration (RAL1) for kilometre scale modelling applications. RAL1 defines the science configuration of the schemes of the atmosphere and land for use in high resolution weather and climate simulations. This configuration will provide a model baseline for any future RAL development to be described against.
In this paper we define the first Met Office Unified Model/JULES Regional Atmosphere and Land...
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