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RISOn Global Nonlinear Geostrophic Balance of an Isolated Distribution of Vorticity Using a New Time Invariant
Publisher: American Meteorological Society
Abstract: A new time invariant of the shallow-water model on the f plane for an isolated distribution of vorticity is obtained. The physical interpretation of the new invariant and its relation to past studies is discussed. It ...
Empirical Normal-Mode Analysis of Atmospheric Data
Publisher: American Meteorological Society
Abstract: The theory of empirical orthogonal functions (EOFs) is generalized in the context of normal modes on unidirectional sheared flows, at first using small disturbance to a monotonic potential vorticity basic state. A wave ...
Empirical Normal Modes versus Empirical Orthogonal Functions for Statistical Prediction
Publisher: American Meteorological Society
Abstract: The theory of empirical normal modes (ENMs) for a shallow water fluid is developed. ENMs are basis functions that both have the statistical properties of empirical orthogonal functions (EOFs) and the dynamical properties ...
Gravity Wave Diagnosis Using Empirical Normal Modes
Publisher: American Meteorological Society
Abstract: The theory of empirical normal modes (ENMs) is adapted to diagnose gravity waves generated by a relatively high-resolution numerical model solving the primitive equations. The ENM approach is based on the principal component ...
The Influence of the Madden–Julian Oscillation on Canadian Wintertime Surface Air Temperature
Publisher: American Meteorological Society
Abstract: Using the homogenized Canadian historical daily surface air temperature (SAT) for 210 relatively evenly distributed stations across Canada, the lagged composites and probability of the above- and below-normal SAT in Canada ...
Extratropical Response to the MJO: Nonlinearity and Sensitivity to the Initial State
Publisher: American Meteorological Society
Abstract: AbstractPrevious studies have shown that the Madden?Julian oscillation (MJO) has a global impact that may provide an important source of skill for subseasonal predictions. The extratropical response was found to be the ...
On the Dynamics of the Formation of the Kelvin Cat’s-Eye in Tropical Cyclogenesis. Part I: Climatological Investigation
Publisher: American Meteorological Society
Abstract: otivated by Dunkerton et al., a climatological study of 54 developing easterly waves in 1998?2001 was performed. Time-lagged composites in a translating reference frame following the disturbances indicate a weak meridional ...
The Importance of Critical Layer in Differentiating Developing from Nondeveloping Easterly Waves
Publisher: American Meteorological Society
Abstract: ecently Asaadi et al. found that an easterly wave (EW) train over the Atlantic and eastern Pacific is oriented in a southeast?northwest direction because of the observed tilt in the easterly jet. This tilt results in only ...
An Observed Connection between the North Atlantic Oscillation and the Madden–Julian Oscillation
Publisher: American Meteorological Society
Abstract: Based on the bivariate Madden?Julian oscillation (MJO) index defined by Wheeler and Hendon and 25 yr (1979?2004) of pentad data, the association between the North Atlantic Oscillation (NAO) and the MJO on the intraseasonal ...
On the Dynamics of the Formation of the Kelvin Cat’s-Eye in Tropical Cyclogenesis. Part II: Numerical Simulation
Publisher: American Meteorological Society
Abstract: shallow-water model is used to study the role of critical layers in tropical cyclogenesis. Forced and unforced problems of disturbances on a parabolic jet associated with weak basic-state meridional potential vorticity ...