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Volume 11, issue 8 | Copyright

Special issue: Nucleus for European Modelling of the Ocean - NEMO

Geosci. Model Dev., 11, 3187-3213, 2018
https://doi.org/10.5194/gmd-11-3187-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 10 Aug 2018

Model description paper | 10 Aug 2018

UK Global Ocean GO6 and GO7: a traceable hierarchy of model resolutions

David Storkey1, Adam T. Blaker2, Pierre Mathiot3,1, Alex Megann2, Yevgeny Aksenov2, Edward W. Blockley1, Daley Calvert1, Tim Graham1, Helene T. Hewitt1, Patrick Hyder1, Till Kuhlbrodt4, Jamie G. L. Rae1, and Bablu Sinha2 David Storkey et al.
  • 1Met Office, FitzRoy Road, Exeter EX1 3LX, UK
  • 2Marine Systems Modelling, National Oceanography Centre, Southampton SO14 3ZH, UK
  • 3British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
  • 4National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading RG6 6BB, UK

Abstract. Versions 6 and 7 of the UK Global Ocean configuration (known as GO6 and GO7) will form the ocean components of the Met Office GC3.1 coupled model and UKESM1 earth system model to be used in CMIP61 simulations. The label GO6 refers to a traceable hierarchy of three model configurations at nominal 1, 1∕4 and 1∕12° resolutions. The GO6 configurations are described in detail with particular focus on aspects which have been updated since the previous version (GO5). Results of 30-year forced ocean-ice integrations with the 1∕4° model are presented, in which GO6 is coupled to the GSI8.1 sea ice configuration and forced with CORE22 fluxes. GO6-GSI8.1 shows an overall improved simulation compared to GO5-GSI5.0, especially in the Southern Ocean where there are more realistic summertime mixed layer depths, a reduced near-surface warm and saline biases, and an improved simulation of sea ice. The main drivers of the improvements in the Southern Ocean simulation are tuning of the vertical and isopycnal mixing parameters. Selected results from the full hierarchy of three resolutions are shown. Although the same forcing is applied, the three models show large-scale differences in the near-surface circulation and in the short-term adjustment of the overturning circulation. The GO7 configuration is identical to the GO6 1∕4° configuration except that the cavities under the ice shelves are opened. Opening the ice shelf cavities has a local impact on temperature and salinity biases on the Antarctic shelf with some improvement in the biases in the Weddell Sea.

1 Coupled Model Intercomparison Project Phase 6 (Eyring et al., 2016)
2 Coordinated Ocean-ice Reference Experiments Phase 2 (Large and Yeager, 2009)

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We document the latest version of the shared UK global configuration of the NEMO ocean model. This configuration will be used as part of the climate models for the UK contribution to the IPCC 6th Assessment Report. 30-year integrations forced with atmospheric forcing show that the new configurations have an improved simulation in the Southern Ocean with the near-surface temperatures and salinities and the sea ice all matching the observations more closely.
We document the latest version of the shared UK global configuration of the NEMO ocean model....
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