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| Titel |
On selecting the resolution to represent eddy dynamics |
| VerfasserIn |
Sergey Danilov, Dmitry Sein, Qiang Wang, Dmitry Sidorenko |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127316
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| Publikation (Nr.) |
 EGU/EGU2016-7179.pdf |
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| Zusammenfassung |
| If meshes with variable resolution, in particular unstructured meshes, are refined
to enable local eddy dynamics, a question
arises as how to vary their resolution and where precisely to deploy the
refinement. We propose to use the observed sea surface height variability
as a criterion. We explore the utility of such an approach (i) in a suite of
simple experiments simulating a wind-driven double gyre flow in a stratified
circular basin and (ii) in simulations of global ocean circulation performed
with the Finite Element Sea Ice Ocean Model (FESOM). For the double
gyre case we show that the variability simulated in the high-resolution
reference run can be well captured on coarser meshes of variable resolution
if they are refined in the domain where the variability is substantial in
the reference run and additionally
include dynamically-important areas around the jet separation. In simulations
related to the real global ocean the refinement based on the observed variability
proves to be helpful too, yet the difference between the simulated and observed
variability may remain higher. In this case it is more difficult to guess how well
the areas upstream of sites with high variability have to be resolved whereas
the practical limitation on the total number of mesh nodes also limits the
size of refined areas if there are too many of them. The presence of coarse mesh
in close proximity to the refined areas effectively damps the simulated
variability in this case. A practical recommendation is to limit refinement to
several regions, but make them sufficiently wide yet still following the observed
variability pattern. |
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