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RISA Non-Reflective Upper Boundary Condition for Limited-Height Hydrostatic Models
Publisher: American Meteorological Society
Abstract: A simple upper boundary condition for hydrostatic, Boussinesq models is derived from a linear internal wave theory, assuming a uniform stratification and no Coriolis effects. This condition is applied in a two-dimentional ...
The Diurnal Cycle of the Marine Stratocumulus Layer: A Higher-Order Model Study
Publisher: American Meteorological Society
Abstract: A third-order turbulence model of the marine stratocumulus layer, including cloud ensemble relations and detailed radiative computation, is used to study a case observed over the North Sea during the JASIN experiment. It ...
Cloud-Ensemble Relations Based on the Gamma Probability Distribution for the Higher-Order Models of the Planetary Boundary Layer
Publisher: American Meteorological Society
Abstract: This paper aims to develop and test a parameterization scheme for partial cloudiness, to be used in the framework of higher-order models of the turbulent planetary boundary layer. The proposed scheme is designed to be ...
A Simple Parameterization of the Large-Scale Effects of Cumulus Convection
Publisher: American Meteorological Society
Abstract: A parameterization of the effects of deep cumulus convection on the large-scale heat and water budget is proposed. It is based on a simple prediction of the convective mass flux, and a global treatment of the detrainment ...
The Effect of Rotation and Surface Friction on Orographic Drag
Publisher: American Meteorological Society
Abstract: A numerical, hydrostatic model is used to investigate the form and magnitude of the pressure drag created by 3D elliptical mountains of various heights (h) and aspect ratios (R) in flows characterized by uniform upstream ...
Nonlinear Flow Past an Elliptic Mountain Ridge
Publisher: American Meteorological Society
Abstract: The hydrostatic flow over an elliptical mountain of aspect ratio 5 is explored by numerical experiments. The upstream profiles of wind and stability are constant, the Coriolis effect is ignored, and there is free slip at ...
Numerical Simulation of a Low-Level Wind Created by Complex Orography: A Cierzo Case Study
Publisher: American Meteorological Society
Abstract: Three-dimensional simulations of the IOP 10 of the Pyrénées Experiment are presented. In this case, the northerly synoptic flow forces two regional winds around the Pyrénées Mountain range: the cierzo in the Ebro Valley ...
Simulation of an Observed Squall Line with a Meso-Beta-Scale Hydrostatic Model
Publisher: American Meteorological Society
Abstract: This paper reports on simulations of an observed squall line with the meso-beta-scale hydrostatic PERIDOT model. An attempt is made to answer the question of what model changes are necessary to roughly simulate a squall ...
On the Stability of the THIRD-Order Turbulence Closure for the Modeling of the Stratocumulus-Topped Boundary Layer
Publisher: American Meteorological Society
Abstract: It is shown that higher-order turbulence-closure models include as particular solutions damped oscillations in the statically stable case, and possibly amplifying and propagating oscillations in the statically unstable ...
Improved Site-Specific Numerical Prediction of Fog and Low Clouds: A Feasibility Study
Publisher: American Meteorological Society
Abstract: Accurate short-term forecasts of low ceiling and visibility are vital to air traffic operation, in order to maximize the use of an airport. The research presented here uses specific local observations and a detailed numerical ...