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Fig. 2.

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Left: ratio between the two physical contributions to either mode damping or the surface effect (turbulent pressure vs. turbulent dissipation and redistribution of kinetic energy), as a function of the drift tensor anisotropy factor, ΦG, for a mode of frequency ν = νmax = 3 mHz. The turbulent velocity anisotropy is set to Φu = 0.5 and the turbulent frequency to ωt = 0.03 rad.s−1. The vertical dashed line marks the limit ΦG = 1: to the left, the dissipation of the vertical turbulent motions prevails over the redistribution of turbulent kinetic energy between horizontal and vertical motions, and vice versa to the right. The horizontal dashed line is the same as in Fig. 1. Right: same ratio, as a function of the turbulent frequency, ωt, for a mode of frequency ν = νmax = 3 mHz. The two anisotropy factors are set to Φu = 0.5 and ΦG = 1.0. The horizontal dashed line is the same as in Fig. 1. (a) R as a function of ΦG (b) R as a function of ωt

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