Petersen, Ralph S.
M.S. (Master of Science)
Department of Geography
Atmospheric circulation--Mathematical models
An efficient technique for the computation of dry isentropic trajectories is presented. The method is baaed on the discrete model formulation of Greenspan that was used by Petersen and Uccelllni which solves the equation of motion numerically. The introduction of an alternate numerical technique enabled a significant reduction of errors and a stabilization for larger time steps when applied to idealized mass and motion fields. To simulate moist adiabatic motions, latent heat release is included in the model through an efficient iterative process. Results using this technique were unique and indistinguishable from those obtained on a thermodynamic diagram. Moist trajectories showed slightly larger errors than comparative dry trajectories clue to several simplifying assumptions and greater accelerations encountered after vertical motions away from the initial isantropic surface. Both. the moist and dry computation techniques yielded reliable, energy-consistent trajectories.
Tremback, Craig, "A moist adiabatic trajectory computation technique based on a modified discrete model formulation" (1980). Graduate Research Theses & Dissertations. 409.
Northern Illinois University
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