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A Linearized Analysis of Diurnal Boundary Layer Convergence over the Topography of the United States
Publisher: American Meteorological Society
Abstract: A linearized model of forced Boussinesq, hydrostatic, gravity inertia waves is developed in a terrain-following coordinate system. Diurnally periodic motions, forced by diurnally fluctuating buoyancy forces above sloping ...
A Variable Resolution Global Model Based upon Fourier and Finite Element Representation
Publisher: American Meteorological Society
Abstract: We describe the development and preliminary testing of a numerical scheme designed to predict the global circulation which can also telescope into local subdomains of enhanced vertical and horizontal resolution. The accuracy ...
The Transient Mass-Flow Adjustment of Heated Atmospheric Circulations
Publisher: American Meteorological Society
Abstract: The transient adjustment of the baroclinic structure of a warm core disturbance forced by heating is studied as an initial value problem. It is found that the divergent flow in convective regions adjusts on a time scale ...
The Influence of One-Way Interacting Lateral Boundary Conditions upon Predictability of Flow in Bounded Numerical Models
Publisher: American Meteorological Society
Abstract: The influence of one-way interacting lateral bounday conditions upon the predictability of flows in boundeddomains is studied using the barotropic nondivergent model in global and local domains. Past studies haveattempted ...
Frictional Effects in Strongly Divergent Flows
Publisher: American Meteorological Society
Abstract: The effect of friction in strongly divergent steady flows is studied. It is found that friction weakens flow divergence out of strong high-pressure centers, contrary to the more commonly studied case for weaker high-pressure ...
Three-Dimensional Characteristics of Diurnally Varying Boundary-Layer Flows
Publisher: American Meteorological Society
Abstract: Numerical models of three-dimensional, diurnally varying, boundary-layer flows are integrated to study the effect of fluctuating pressure gradients and eddy stresses within different circulation systems. The computational ...
DIURNAL VARIATIONS IN BOUNDARY LAYER WINDS OVER THE SOUTH-CENTRAL UNITED STATES IN SUMMER
Publisher: American Meteorological Society
Abstract: Analysis of 1 week's data in August 1960 shows significant diurnal variations in surface geostrophic wind over the south-central United States. The oscillation in the southerly component (Vg) is driven by the response of ...
Sensitivity of North American Numerical Weather Prediction to Initial State Uncertainty in Selected Upstream Subdomains
Publisher: American Meteorological Society
Abstract: In this study the impact of initial uncertainty in localized regions on midrange forecast sensitivity over North America is studied. The local regions considered are the North American domain and two areas upstream, one ...
Sensitivity of a Global Forecast Model to Initializations with Reanalysis Datasets
Publisher: American Meteorological Society
Abstract: A global research model is initialized with reanalysis datasets obtained from NCEP and ECMWF. The globally averaged accuracy of the resulting 120-h predictions varies little between the different initializations, but a ...