the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Impact of the current feedback on kinetic energy over the North-East Atlantic from a coupled ocean/atmospheric boundary layer model
Abstract. A one-dimensional Atmospheric Boundary Layer (ABL1D) is coupled with the NEMO ocean model and implemented over the Iberian–Biscay–Ireland (IBI) area at 1/36° resolution to investigate the retroactions between the surface currents and the atmosphere, namely the Current FeedBack (CFB) in this region of low mesoscale activity. The ABL1D-NEMO coupled model is forced by a large-scale atmospheric reanalysis (ERA-Interim) and integrated over the period 2016–2017.
The mechanisms of eddy kinetic energy damping and ocean upper-layers re-energization are realistically simulated, meaning that the CFB is properly represented by the model. In particular, the dynamical coupling coefficients between the curls of surface stress/wind and current are in agreement with the literature.
The effects of CFB on the kinetic energy (KE) are then investigated through a KE budget. We show that the KE decrease induced by the CFB is significant down to 1500 m. Near the surface (0–300 m), most of the KE decrease can be explained by a reduction of the surface wind work by 4 %. At depth (300–2000 m), the CFB induce a reduction of the pressure work (i.e: the PE to KE conversion) associated with a reduction of KE which is significant down to 1500 m. We show that this reduction of KE at depth can be explained by CFB-induced Ekman pumping above eddies that weakens the mesoscale activity and this over the whole water column.
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Preprint
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Interactive discussion
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RC1: 'Referee's comment', Christopher W. Hughes, 17 Mar 2021
- AC1: 'Reply on RC1', Théo Brivoal, 19 May 2021
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RC2: 'Referee B's comments', Anonymous Referee #2, 24 Mar 2021
- AC2: 'Reply on RC2', Théo Brivoal, 19 May 2021
Interactive discussion
-
RC1: 'Referee's comment', Christopher W. Hughes, 17 Mar 2021
- AC1: 'Reply on RC1', Théo Brivoal, 19 May 2021
-
RC2: 'Referee B's comments', Anonymous Referee #2, 24 Mar 2021
- AC2: 'Reply on RC2', Théo Brivoal, 19 May 2021
Data sets
ASCAT ON METOP LEVEL 4 DAILY GRIDDED MEAN WIND FIELDS IN 0.25° GEOGRAPHICAL GRID A. Bentamy and D. Croize Fillon https://doi.org/10.1080/01431161.2011.600348
Model code and software
NEMO ocean engine NEMO System Team https://doi.org/10.5281/zenodo.1464816
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Cited
2 citations as recorded by crossref.
- A simplified atmospheric boundary layer model for an improved representation of air–sea interactions in eddying oceanic models: implementation and first evaluation in NEMO (4.0) F. Lemarié et al. 10.5194/gmd-14-543-2021
- The Copernicus Global 1/12° Oceanic and Sea Ice GLORYS12 Reanalysis L. Jean-Michel et al. 10.3389/feart.2021.698876