features is the very low potential vorticity mode water created for the case of anomalous surface cooling (Fig. 4.106b, d).

The difference between these cases can be seen clearly from profiles of stratification and potential vorticity taken at a station (26° N, 5° E), which is near the western boundary and at a location corresponding to the Bermuda station in the Atlantic. Most interestingly, all perturbations appear in the form of the second dynamical thermocline mode-like features (Fig. 4.107a).

a Stratification b Potential vorticity a Stratification b Potential vorticity

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