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Fig. C.17.


Parameter study (2D model) for different values of the superadiabaticity δ, at fixed νt = 100 km2 s−1. The modes are those shown in Fig. 1. The spiral patterns in uϕ of the m = 1 high-latitude and m = 2 critical-latitude modes are sensitive to a small change in δ. To obtain a pattern consistent with the observations, δ < 2 × 10−7 is implied. The case δ = 10−6 is excluded by both the eigenfunctions and the eigenfrequencies. The m = 3 equatorial Rossby mode is almost independent of δ because it is nearly purely horizontal (quasi-toroidal).

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