3. Static stability (a) Consider the vertical density profile in which the density increases linearly with depth in the upper 30 m. The potential density (sq) at the surface is 25.0, and sq at 30 m is 25.03. Compute the Brunt-Bisl frequency (N), and the period of oscillation (2p/N) in the upper 30 m at this location. Please include the unit in your answer. (b) Measurements at another location indicates that the Brunt Bisl frequency (N) is 0.03 sec-1. Is this density structure more stable or less stable than that in (a)? Explain physically (not mathematically) why?