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  • Articles  (13)
  • 2015-2019  (13)
  • 2016  (13)
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  • 2015-2019  (13)
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  • 11
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    Eddy dynamics on meshes with variable resolution (2016)
    In:  EPIC3DRAKKAR 2016 Annual Meeting, Grenoble, 2016-01-25-2016-01-27
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    Publication Date: 2016-05-18
    Description: When mesh resolution is refined to allow eddies, their dynamics equilibrate only some distance inside the refined areas. (1) The implication is that (i) there is a zone where simulated variability will be either too low or too high and that (ii) relatively large refinement areas should be used, similar to nesting. (2) We propose that the shape of refined areas can be adjusted based on a low-pass pattern of the observed variability. Scaled biharmonic viscosity is sufficient to warrant smoothness of solutions. Momentum advection implementation affects smoothness of vertical velocity.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 12
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    Designing variable ocean model resolution based on the observed ocean variability (2016)
    In:  EPIC3Journal of Advances in Modeling Earth Systems, 8(2), pp. 904-916
    Details
    Publication Date: 2016-09-19
    Description: If unstructured meshes are refined to locally represent eddy dynamics in ocean circulation models, a practical question arises on how to vary the resolution and where to deploy the refinement. We propose to use the observed sea surface height variability as the refinement criterion. We explore the utility of this method (i) in a suite of idealized experiments simulating a wind-driven double gyre flow in a stratified circular basin and (ii) in simulations of global ocean circulation performed with FESOM. Two practical approaches of mesh refinement are compared. In the first approach the uniform refinement is confined within the areas where the observed variability exceeds a given threshold. In the second one the refinement varies linearly following the observed variability. The resolution is fixed in time. For the double gyre case it is shown that the variability obtained in a high-resolution reference run can be well captured on variable-resolution meshes if they are refined where the variability is high and additionally upstream the jet separation point. The second approach of mesh refinement proves to be more beneficial in terms of improvement downstream the midlatitude jet. Similarly, in global ocean simulations the mesh refinement based on the observed variability helps the model to simulate high variability at correct locations. The refinement also leads to a reduced bias in the upper-ocean temperature.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 13
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    Interannual variability of the Arctic freshwater cycle in the second half of the twentieth century in a regionally coupled climate model (2016)
    In:  EPIC3Climate Dynamics
    Details
    Publication Date: 2016-03-29
    Description: We use a regionally coupled ocean-sea ice-atmosphere-hydrological discharge model to investigate the influence of changes in the atmospheric large-scale circulation on the interannual variability of the Arctic freshwater (FW) components. This model includes all sinks and sources of FW and allows for the analysis of a closed FW cycle in the Arctic. We show that few atmospheric winter modes explain large parts of the interannual variability of the Arctic FW cycle. A strong Icelandic low causing anomalous strong westerlies over the North Atlantic leads to warmer and wetter conditions over Eurasia. The ocean circulation is then characterized by a strong transpolar drift leading to increased export of FW in liquid and solid form into the North Atlantic. In contrast to this, a weaker than usual Icelandic low and a strong Siberian high is associated with a strong Beaufort Gyre and thus an accumulation of FW within the Arctic Ocean. Not only specific winter conditions but also increased precipitation in late spring and summer, caused by enhanced cyclone activity over land, lead to increased Eurasian runoff, which is responsible for most of the variability in Arctic river runoff.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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