Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
01 Feb 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
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 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
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 UKESM earth system model to be used in CMIP6 simulations. The label "GO6" refers to a traceable hierarchy of three model configurations at nominal 1°, 1/4° and 1/12° resolution. 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 CORE2 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 tunings 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.

Citation: Storkey, D., Blaker, A. T., Mathiot, P., Megann, A., Aksenov, Y., Blockley, E. W., Calvert, D., Graham, T., Hewitt, H. T., Hyder, P., Kuhlbrodt, T., Rae, J. G. L., and Sinha, B.: UK Global Ocean GO6 and GO7: a traceable hierarchy of model resolutions, Geosci. Model Dev. Discuss.,, in review, 2018.
David Storkey et al.
David Storkey et al.
David Storkey et al.


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Latest update: 24 Feb 2018
Publications Copernicus
Short summary
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....