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RISUsing Probability Density Functions to Derive Consistent Closure Relationships among Higher-Order Moments
Publisher: American Meteorological Society
Abstract: Parameterizations of turbulence often predict several lower-order moments and make closure assumptions for higher-order moments. In principle, the low- and high-order moments share the same probability density function ...
Record High 2022 September-Mean Temperature in Western North America
Publisher: American Meteorological Society
Turbulence and Vertical Fluxes in the Stable Atmospheric Boundary Layer. Part II: A Novel Mixing-Length Model
Publisher: American Meteorological Society
Abstract: his is the second part of a study about turbulence and vertical fluxes in the stable atmospheric boundary layer. Based on a suite of large-eddy simulations in Part I where the effects of stability on the turbulent structures ...
A PDF-Based Model for Boundary Layer Clouds. Part I: Method and Model Description
Publisher: American Meteorological Society
Abstract: A new cloudy boundary layer single-column model is presented. It is designed to be flexible enough to represent a variety of cloudiness regimes?such as cumulus, stratocumulus, and clear regimes?without the need for ...
Small-Scale and Mesoscale Variability in Cloudy Boundary Layers: Joint Probability Density Functions
Publisher: American Meteorological Society
Abstract: The joint probability density function (PDF) of vertical velocity and conserved scalars is important for at least two reasons. First, the shape of the joint PDF determines the buoyancy flux in partly cloudy layers. Second, ...
A PDF-Based Model for Boundary Layer Clouds. Part II: Model Results
Publisher: American Meteorological Society
Abstract: A new single-column model for the cloudy boundary layer, described in a companion paper, is tested for a variety of regimes. To represent the subgrid-scale variability, the model uses a joint probability density function ...
The Liquid Water Oscillation in Modeling Boundary Layer Cumuli with Third-Order Turbulence Closure Models
Publisher: American Meteorological Society
Abstract: A hierarchy of third-order turbulence closure models are used to simulate boundary layer cumuli in this study. An unrealistically strong liquid water oscillation (LWO) is found in the fully prognostic model, which predicts ...
Evaluation of the Warm Rain Formation Process in Global Models with Satellite Observations
Publisher: American Meteorological Society
Abstract: his study examines the warm rain formation process over the global ocean in global climate models. Methodologies developed to analyze CloudSat and Moderate Resolution Imaging Spectroradiometer (MODIS) satellite observations ...
Multivariate Probability Density Functions with Dynamics in the GFDL Atmospheric General Circulation Model: Global Tests
Publisher: American Meteorological Society
Abstract: unified turbulence and cloud parameterization based on multivariate probability density functions (PDFs) has been incorporated into the GFDL atmospheric general circulation model (AM3). This PDF-based parameterization not ...
Elucidating Model Inadequacies in a Cloud Parameterization by Use of an Ensemble-Based Calibration Framework
Publisher: American Meteorological Society
Abstract: Every cloud parameterization contains structural model errors. The source of these errors is difficult to pinpoint because cloud parameterizations contain nonlinearities and feedbacks. To elucidate these model inadequacies, ...