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Revision of the current theory of unstably stratified turbulence and its potential implications for PEEX

Turbulence in unstably stratified flows is traditionally considered as chaotic eddies generated on equal terms by the two very different mechanisms: mean velocity shears, and buoyancy forces. By this means, vertical buoyant plumes comprising “convective turbulence” are not distinguished form 3-dimensional shear-generated eddies comprising “mechanical turbulence”. The latter are dynamically unstable and, hence, break down to produce smaller eddies, thus performing direct cascade of turbulent kinetic energy (TKE) and other properties of turbulence from larger to smaller scales towards their molecular dissipation. The conventional theory does not distinguish convective plumes from mechanical eddies and, factually, postulates that plumes also perform the direct cascade.