Discussion
Which type of instability requires shear as well as stratification?
Answer: B
Kelvin Helmholtz instability occurs when the shear is strong enough to overcome the stratification, with the criterion expressed through the Richardson number falling below one quarter. Convective instability needs no shear at all. Symmetric and baroclinic instabilities both involve shear but through rotation and the thermal wind rather than through direct overturning of the interface. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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