Nonlinear Dynamics Applied to Atmospheric Prediction

Abstract

Under AFOSR grant F49620-92-J-0498, Drs Barcilon and Nathan are studying the impact of steady, zonally varying vorticity forcing on topographic instability and finite amplitude, low frequency oscillations. The model consists of a viscous, barotropic fluid on a zonally periodic, midlatitude B-plane channel, bounded above by a flat, rigid boundary, below by a bottom topography, and laterally by sidewalls at y = o,TT Topographically induced low frequency oscillations in the presence of a steady, zonally varying vorticity source have been studied. The source has been shown to interact with the pertubation field to produce zonally rectified wave fluxes that change the zonal momentum balance of the system. This change provides a mechanism for coupling the topographic and vorticity forcings, leading to a dramatic alteration in the Hopf bifurcation from stationary to low frequency, finite amplitude oscillation.

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Document Details

Document Type
Technical Report
Publication Date
Oct 14, 1993
Accession Number
ADA273437

Entities

People

  • Richard L. Pfeffer

Organizations

  • Florida State University

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Amplitude
  • Atmospheric Sciences
  • Boundaries
  • Boundary Layer
  • Computational Science
  • Convection
  • Data Sets
  • Dynamics
  • Fluid Dynamics
  • Fluid Flow
  • Frequency
  • Momentum
  • Nonlinear Dynamics
  • Oscillation
  • Topography
  • Viscous Flow
  • Weather Forecasting

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Atmospheric Science/Meteorology