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Discussion papers
https://doi.org/10.5194/os-2019-4
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2019-4
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Feb 2019

Research article | 04 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

The impact of a new high-resolution ocean model on the Met Office North-West European Shelf forecasting system

Marina Tonani1, Peter Sykes1, Robert R. King1, Niall McConnell1, Anne-Christine Pequignet1, Enda O'Dea1, Jennifer A. Graham2, Jeff Polton3, and John Siddorn1 Marina Tonani et al.
  • 1Met Office, Exeter, EX1 3PB, UK
  • 2Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, NR33 0HT, UK
  • 3National Oceanography Centre, Liverpool, L3 5DA, UK

Abstract. The North-West European shelf ocean forecasting system has been providing oceanographic products for the European continental shelf seas for more than fifteen years. In that time several different configurations have been implemented, updating the model and the data assimilation components.

The latest configuration to be put in operations, an eddy resolving model at 1.5 km (AMM15), replaces the 7 km model (AMM7) that has been used for a number of years. This has improved the ability to resolve the mesoscale variability in this area. An overview of this new system and its initial validation is provided in this paper, highlighting the differences with the previous version.

Validation of the model is based on the results of two years (2016–2017) trial experiments run with the low and high resolution systems in their operational configuration. The 1.5 km system has been validated against observations and the low resolution system, trying to understand the impact of the high resolution on the quality of the products delivered to the users. Although the number of observations is a limiting factor, especially for the assessment of model variables like currents and salinity, the new system has been proven to be an improvement in resolving fine scale structures and variability and provides more accurate information on the major physical variables, like temperature, salinity and horizontal currents. AMM15 improvements are evident from the validation against high-resolution observations, available in some selected areas of the model domain. However, validation at the basin scale and using daily means penalised the high-resolution system and does not reflect its superior performance. This increment in resolution also improves the capabilities to provide marine information closer to the coast even if the coastal processes are not fully resolved by the model.

Marina Tonani et al.
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Latest update: 22 Feb 2019
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Short summary
A new high resolution ocean model at 1.5 km has replaced the 7 km system for delivering short term forecasts of the North-West European shelf Seas. The products, temperature, salinity, currents, sea surface height, are available on the Copernicus Marine Service catalogue. This study is focus on the high resolution impact on the quality of the products delivered to the users. Results show that the high resolution model is better resolving the variability of the physical variables.
A new high resolution ocean model at 1.5 km has replaced the 7 km system for delivering short...
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