where bj are the coefficients determined through a least-square fitting to the constraints.
Assume that a water parcel at level z is displaced to a slightly higher level z + Z .Its density will be different from that of the new environment. Whether such an initial perturbation is stable depends on the vertical distribution of water properties. We will assume that the processes are adiabatic and reversible, so the new density of the parcel at the new location will be
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