Regular and irregular baroclinic waves in a Martian general circulation model: A role for diurnal forcing?
ADV SPACE RES 16:6 (1995) 3-7
Abstract:
The development and evolution of baroclinic transient waves are simulated in a high resolution, general circulation model (GCM) of the Martian atmosphere, including simulations both with and without a representation of the diurnal cycle of solar heating. Simulations with diurnally-averaged insolation are found to develop highly regular baroclinic transients during northern hemisphere autumn, winter and spring seasons, characterized by zonal wavenumber 1 or 2 and periods of 2-6 sols (a sol being a Martian day). With a diurnal cycle, however, transients are found to be significantly more irregular throughout the winter season, sporadically changing their dominant wavenumber and frequency, and resemble more closely data from the Viking Lander time series. These results are discussed with reference to some simple conceptual models in nonlinear dynamics, in terms either of a periodically-perturbed, self-exciting oscillator, or of attractor-merging near a crisis in a periodically perturbed bistable system.WESTERN BOUNDARY CURRENTS IN THE MARTIAN ATMOSPHERE - NUMERICAL SIMULATIONS AND OBSERVATIONAL EVIDENCE
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 100:E3 (1995) 5485-5500
Sloping convection: A paradigm for large-scale waves and eddies in planetary atmospheres?
Chaos 4:2 (1994) 135-162
Abstract:
In laboratory studies and associated theoretical and numerical work covering a very wide range of conditions (as specified by the key dimensionless parameters of the systems used) the phenomenon of sloping convection in rotating fluids can manifest itself in one of several spatial forms (waves, closed eddies, and combinations thereof), but all with strong local gradients (fronts, jet streams) and exhibiting various types of temporal behavior [steady, periodic vacillation, aperiodic (geostrophic) turbulence]. These general properties were first discovered in cylindrical (annular) systems, but they do not depend critically on geometry; differences between spherical and cylindrical systems are largely to be found in quantitative details. In all cases, the raison d'e tre of sloping convection is horizontal advective transfer, a process accompanied by upward advective heat transfer, which affects and may control vertical potential density gradients. It has been argued that sloping convection is the basic dynamical process underlying a wide variety of large-scale flow phenomena seen in planetary atmospheres (e.g., irregular waves in the Earth's atmosphere, regular waves in the Martian atmosphere, the Jovian Great Red Spot and other long-lived eddies seen in the atmospheres of the giant planets). In this review the extent to which this paradigm is upheld in the atmospheres of the major planets by recent work is discussed.WESTERN BOUNDARY CURRENTS IN THE ATMOSPHERE OF MARS
NATURE 367:6463 (1994) 548-551
PHASE PORTRAIT RECONSTRUCTION USING MULTIVARIATE SINGULAR SYSTEMS-ANALYSIS
PHYSICA D 69:3-4 (1993) 353-365