AMM15: a new high-resolution NEMO configuration for operational simulation of the European north-west shelf

Graham, Jennifer; O’Dea, Enda; Holt, Jason; Polton, Jeff A.; Hewitt, Helene T.; Furner, Rachel; Guihou, Karen; Brereton, Ashley; Arnold, Alex; Wakelin, Sarah; Sanchez, Juan Manuel Castillo; Adame, C. Gabriela Mayorga

doi:10.5194/gmd-11-681-2018

Cited by 90 publications

(137 citation statements)

References 39 publications

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“…This domain now also represents the common domain selected and in use in uncoupled mode configurations at the Met Office as the operational weather forecast UK atmosphere (UKV; e.g. Tang et al, 2013) from November 2016 and in research development for future operational implementation as an ocean forecast system (AMM15; Graham et al, 2017).…”

Section: Establishing a Common Domain For Uk Environmental Predictionmentioning

confidence: 99%

“…Model physics options used mirror those defined in the AMM15 configuration namelists (see the Supplement), and further details are provided by Graham et al (2017). Given the km-scale resolution, only a minimal amount of eddy viscosity is applied in the lateral diffusion scheme, to ensure model stability.…”

Section: The Uko2 Ocean Componentmentioning

confidence: 99%

“…Siddorn et al, 2016), and the initial conditions are taken from a 1-year run of the UKO2 configuration initialized from the 2014 AMM15 hindcast on 1 January 2015. For initial development, climatological river discharge data are applied as freshwater forcing (Graham et al, 2017). The impact of using the freshwater fluxes from UKL2 on the ocean component will be assessed in future work.…”

Section: Uko2 Initialization and Forcingmentioning

confidence: 99%

“…The UKO2 ocean configuration mirrors the Atlantic Margin Model (AMM15) ocean-only shelf-sea forecasting system (Graham et al, 2017), which is being developed and further tested towards future operational implementation as part of the evolution of the EU Copernicus North West Shelf Marine Service (http://marine.copernicus.eu/, European Commission, 2017).…”

Section: The Uko2 Ocean Componentmentioning

confidence: 99%

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The UKC2 regional coupled environmental prediction system

et al. 2018

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Abstract. It is hypothesized that more accurate prediction and warning of natural hazards, such as of the impacts of severe weather mediated through various components of the environment, require a more integrated Earth System approach to forecasting. This hypothesis can be explored using regional coupled prediction systems, in which the known interactions and feedbacks between different physical and biogeochemical components of the environment across sky, sea and land can be simulated. Such systems are becoming increasingly common research tools. This paper describes the development of the UKC2 regional coupled research system, which has been delivered under the UK Environmental Prediction Prototype project. This provides the first implementation of an atmosphere-land-ocean-wave modelling system focussed on the United Kingdom and surrounding seas at km-scale resolution. The UKC2 coupled system incorporates models of the atmosphere (Met Office Unified Model), land surface with river routing (JULES), shelf-sea ocean (NEMO) and ocean waves (WAVEWATCH III). These components are coupled, via OASIS3-MCT libraries, at unprecedentedly high resolution across the UK within a north-western European regional domain. A research framework has been established to explore the representation of feedback processes in coupled and uncoupled modes, providing a new research tool for UK environmental science. This paper documents the technical design and implementation of UKC2, along with the associated evaluation framework. An analysis of new results comparing the output of the coupled UKC2 system with relevant forced control simulations for six contrasting case studies of 5-day duration is presented. Results demonstrate that performance can be achieved with the UKC2 system that is at least comparable to its component control simulations. For some cases, improvements in air temperature, sea surface temperature, wind speed, significant wave height and mean wave period highlight the potential benefits of coupling between environmental model components. Results also illustrate that the coupling itself is not sufficient to address all known model issues. Priorities for future development of the UK Environmental Prediction framework and component systems are discussed.

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Section: Establishing a Common Domain For Uk Environmental Predictionmentioning

confidence: 99%

Section: The Uko2 Ocean Componentmentioning

confidence: 99%

Section: Uko2 Initialization and Forcingmentioning

confidence: 99%

Section: The Uko2 Ocean Componentmentioning

confidence: 99%

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The UKC2 regional coupled environmental prediction system

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“…Figure 15a). Similarly, Graham et al (2018) compared 20-year runs of AMM15 (1.5-km resolution) and an AMM7 run, which corresponds to the ST run in this study. They report that the summer months (June-August, JJA) bottom temperature biases (model minus EN4) varied from 0.47 ±1.19°C to 0.50 ±1.31°C for the different configurations.…”

Section: Journal Of Geophysical Research: Oceansmentioning

confidence: 99%

Challenging Vertical Turbulence Mixing Schemes in a Tidally Energetic Environment: 1. 3‐D Shelf‐Sea Model Assessment

et al. 2019

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Mixing in the ocean and shelf seas is critical for the vertical distribution of dynamically active properties, such as density and biogeochemical tracers. Eight different decadal simulations are used to assess the skill of vertical turbulent mixing schemes (TMS) in a 3‐D regional model of tidally active shelf seas. The TMS differ in the type of stability functions used and in the Ozmidov/Deardorff/Galperin limiter of the turbulence length scales. We review the dependence of the critical Richardson and Prandtl numbers to define the “diffusiveness” of the TMS. The skill in representing bias and variability of stratification profiles is assessed with five different metrics: surface and bottom temperatures and pycnocline depth, thickness, and strength. The assessment is made against hydrography from three data sets (28,000 profiles in total). Bottom and surface temperatures are found to be as sensitive to TMS choice as to horizontal resolution or heat flux formulation, as reported in other studies. All TMS underrepresent the pycnocline depth and benthic temperatures. This suggests physical processes are missing from the model, and these are discussed. Different TMSs show the best results for different metrics, and there is no outright winner. Simulations coupled with an ecosystem model show the choice of TMS strongly affects the ecosystem behavior: shifting the timing of peak chlorophyll by 1 month, showing regional chlorophyll differences of order 100%, and redistributing the production of chorophyll between the pycnocline and mixed layer.

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Kilometric Scale Modeling of the North West European Shelf Seas: Exploring the Spatial and Temporal Variability of Internal Tides

et al. 2018

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The North West European Shelf break acts as a barrier to the transport and exchange between the open ocean and the shelf seas. The strong spatial variability of these exchange processes is hard to fully explore using observations, and simulations generally are too coarse to simulate the fine‐scale processes over the whole region. In this context, under the FASTNEt program, a new NEMO configuration of the North West European Shelf and Atlantic Margin at 1/60° (∼1.8 km) has been developed, with the objective to better understand and quantify the seasonal and interannual variability of shelf break processes. The capability of this configuration to reproduce the seasonal cycle in SST, the barotropic tide, and fine‐resolution temperature profiles is assessed against a basin‐scale (1/12°, ∼9 km) configuration and a standard regional configuration (7 km resolution). The seasonal cycle is well reproduced in all configurations though the fine‐resolution allows the simulation of smaller scale processes. Time series of temperature at various locations on the shelf show the presence of internal waves with a strong spatiotemporal variability. Spectral analysis of the internal waves reveals peaks at the diurnal, semidiurnal, inertial, and quarter‐diurnal bands, which are only realistically reproduced in the new configuration. Tidally induced pycnocline variability is diagnosed in the model and shown to vary with the spring neap cycle with mean displacement amplitudes in excess of 2 m for 30% of the stratified domain. With sufficiently fine resolution, internal tides are shown to be generated at numerous bathymetric features resulting in a complex pycnocline displacement superposition pattern.

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AMM15: a new high-resolution NEMO configuration for operational simulation of the European north-west shelf

Cited by 90 publications

References 39 publications

The UKC2 regional coupled environmental prediction system

The UKC2 regional coupled environmental prediction system

Challenging Vertical Turbulence Mixing Schemes in a Tidally Energetic Environment: 1. 3‐D Shelf‐Sea Model Assessment

Kilometric Scale Modeling of the North West European Shelf Seas: Exploring the Spatial and Temporal Variability of Internal Tides

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