The work of Hans Burchard has been supported by the EU-funded project European Coastal-Shelf Sea Operational Monitoring and Forecasting System (ECOOP; Contract 36355). Elisabeth Schulz is a grant holder of the Interdisciplinary Faculty of the University of Rostock, Germany. We thank Malcolm Scully (Old Dominion University, Norfolk, Virginia) for pointing out that more processes than classical tidal straining contribute to the covariance between longitudinal vertical shear and eddy viscosity. We are furthermore grateful to Richard Hofmeister (Warnemünde, Germany) for supporting us with his python skills for the graphics and to Karsten Bolding (Asperup, Denmark) for keeping GETM up and running. Finally, we thank Parker MacCready (University of Washington, Seattle) and an anonymous referee for their constructive comments on earlier versions of the manuscript.
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