On the intrinsic hydrostatic energy structure of the barotropic compressible primitive equations

RESUMO

In the compressible primitive equations, gravity is not merely a source term: through the hydrostatic balance it forces, it organizes the system's energy geometry. The hydrostatic balance forces the sum of the barotropic enthalpy and the geopotential to be independent of the vertical coordinate an intrinsic rst hydrostatic integral, coinciding with the classical Montgomery potential of geophysical uid dynamics and testing the continuity equation against it gives the total mechanical energy identity, with no separate estimate on the vertical velocity. The core of this note is an augmented hydrostatic identity, obtained by testing the momentum equation against a BreschDesjardins-type augmented velocity: dierentiating the rst integral again produces two structural functions governing its cross terms, whose vanishing cases are characterized exactly here one vanishes identically if and only if the pressure is quadratic, the other if and only if it is isothermal, no law annihilating both. The resulting augmented identity also isolates a coupling involving the horizontal gradient of the vertical velocity that is not controlled by the energetic structure developed here, a limitation of this direct route to closing a BreschDesjardinstype entropy, not an impossibility theorem. For the isothermal law, the vanishing of the second function forces the vertical density prole to be a pure exponential, exactly the factorization underlying the Ersoy NgomSy change of variables the multiplicative expression of the Montgomery rst integral at that one law on which basis we give a detailed return-to-original-variables argument for the existence theorem of Wang, Dou and Jiu.