Non‐Boussinesq effects and further development in a model of upper tropospheric frontogenesis

In previous papers, upper tropospheric frontogenesis has been exhibited in a model in which a horizontal deformation field acts on a temperature distribution in a Boussinesq two fluid system. The basic approximation made is that the flow along the incipient front is geostrophic. This approximation allows the reduction of the problem to that of solving a non‐linear second order partial differential equation. Here this equation is solved by a slightly different technique. Non‐Boussinesq effects are included and are shown to produce a strengthening of the upper‐tropospheric front and its associated jet stream. Further deformation is allowed and the development of a more realistic front described.