Hierarchy of mesoscale flow assumptions and equations
The present research proposes a standard nomenclature for mesoscale meteorological concepts, and integrates existing concepts of atmospheric space scales, flow assumptions, governing equations and resulting motions into a hierarchy useful in categorisation of mesoscale models. New dynamically based mesoscale time- and space-scale boundaries are proposed, consistent with the importance of the Coriolis force. In the proposed flow class classification, the starting point is the complete set of mesoscale equations for non-Boussinesq flows. Criteria used to differentiate each resulting flow class are discussed, while the resulting governing thermodynamic and dynamic equations for each motion type are given. Separate graphical representations during stable and unstable conditions of the spatial limits of each Boussinesq mesoscale flow sub-class are constructed from order of magnitude estimates for the various length and flow class separation criteria. A summary is given of the consensus in the literature concerning the equation sets necessary to reproduce characteristics associated with specific atmospheric flow phenomena. Comparative modelling studies are required to test the quantitative aspects of many of the ideas put forward in this paper.
Bibliographic Reference: Article: (1995)
Record Number: 199511430 / Last updated on: 1995-11-03
Original language: en
Available languages: en