Near-Surface Horizontal Wavenumber Spectra of the Greater Agulhas Region from a 1/60° Model and from Satellite Observations.

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Schubert, René, Biastoch, Arne and Schwarzkopf, Franziska U. (2018) Near-Surface Horizontal Wavenumber Spectra of the Greater Agulhas Region from a 1/60° Model and from Satellite Observations. [Talk] In: DRAKKAR 2018 Annual Workshop. , 22.-24.01.2018, Grenoble, France .

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Abstract

The Greater Agulhas Region is one of the regions with highest mesoscale activity in the world ocean. Among other drivers, the interactions of the mesoscale eddies drive energetic submesoscale dynamics in the surface boundary layer. Here we derive near-surface horizontal wavenumber spectra from high-resolution satellite products and from the output of a double nested (1/20°, 1/60°) NEMO configuration with 120 vertical levels. The nests are embedded via AGRIF in a ORCA025 base model. The regional distribution of inertial range and mesoscale spectral slopes can be attributed to the different dynamical regimes prevalent in the Greater Agulhas Region. Further, we emphasize the use of horizontal wavenumber spectra to identify an appropriate choice of the subgrid closure for the model.

Document Type: Conference or Workshop Item (Talk)
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
Date Deposited: 22 Nov 2018 11:46
Last Modified: 22 Nov 2018 11:46
URI: https://oceanrep.geomar.de/id/eprint/44721

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