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An Empirical Normal Mode Diagnostic Algorithm Applied to NCEP Reanalyses
Publisher: American Meteorological Society
Abstract: A diagnostic algorithm, based on the empirical normal mode decomposition technique, is proposed as a diagnostic tool in studies of the atmospheric variability. It begins by analyzing the transient eddies in terms of empirical ...
Representing Richardson Number Hysteresis in the NWP Boundary Layer
Publisher: American Meteorological Society
Abstract: urbulence in the planetary boundary layer (PBL) transports heat, momentum, and moisture in eddies that are not resolvable by current NWP systems. Numerical models typically parameterize this process using vertical diffusion ...
Empirical Normal Mode Diagnostic Study of the GEM Model's Dynamical Core
Publisher: American Meteorological Society
Abstract: An algorithm based on the empirical normal mode analysis is used in a comparative study of the climatology and variability in dynamical-core experiments of the Global Environmental Multiscale model. The algorithm is proposed ...
Adapting Two-Moment Microphysics Schemes across Model Resolutions: Subgrid Cloud and Precipitation Fraction and Microphysical Sub–Time Step
Publisher: American Meteorological Society
Abstract: wo-moment multiclass microphysics schemes are very promising tools to be used in high-resolution NWP models. However, they must be adapted for coarser resolutions. Here, a twofold solution is proposed?namely, a simple ...
A Convection Parameterization for Low-CAPE Environments
Publisher: American Meteorological Society
Use of a Genetic Algorithm to Optimize a Numerical Weather Prediction System
Publisher: American Meteorological Society
Implementation of Deterministic Weather Forecasting Systems Based on Ensemble–Variational Data Assimilation at Environment Canada. Part I: The Global System
Publisher: American Meteorological Society
Abstract: major set of changes was made to the Environment Canada global deterministic prediction system during the fall of 2014, including the replacement of four-dimensional variational data assimilation (4DVar) by four-dimensional ...
Impact of Coupling with an Ice–Ocean Model on Global Medium-Range NWP Forecast Skill
Publisher: American Meteorological Society
Abstract: AbstractThe importance of coupling between the atmosphere and the ocean for forecasting on time scales of hours to weeks has been demonstrated for a range of physical processes. Here, the authors evaluate the impact of an ...
Staggered Vertical Discretization of the Canadian Environmental Multiscale (GEM) Model Using a Coordinate of the Log-Hydrostatic-Pressure Type
Publisher: American Meteorological Society
Abstract: he Global Environmental Multiscale (GEM) model is the Canadian atmospheric model used for meteorological forecasting at all scales. A limited-area version now also exists. It is a gridpoint model with an implicit semi-Lagrangian ...
Systematic Errors in Weather and Climate Models: Nature, Origins, and Ways Forward
Publisher: American Meteorological Society