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RISPrognostic Equations for Cloud Fraction and Liquid Water, and Their Relation to Filtered Density Functions
Publisher: American Meteorological Society
Abstract: This paper derives prognostic equations for cloud fraction and specific liquid water content. Such equations are carried by host models in order to provide more accurate forcing of microphysical and radiative parameterizations. ...
The Relationship between the Transilient Matrix and the Green’s Function for the Advection-Diffusion Equation
Publisher: American Meteorological Society
Abstract: The Green?s function (or propagator) of the advection-diffusion equation is used to link the transilient matrix to the advection-diffusion equation. The Green?s function framework allows one to construct more rigorous and ...
An Analytic Scaling Law for the Depositional Growth of Snow in Thin Mixed-Phase Layer Clouds
Publisher: American Meteorological Society
Abstract: In various practical problems, such as assessing the threat of aircraft icing or calculating radiative transfer, it is important to know whether mixed-phase clouds contain significant liquid water content. Some mixed-phase ...
Using 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 ...
An Analytic Longwave Radiation Formula for Liquid Layer Clouds
Publisher: American Meteorological Society
Abstract: Many Global Energy and Water Cycle Experiment (GEWEX) Cloud System Study (GCSS) intercomparisons of boundary layer clouds have used a convenient but idealized longwave radiation formula for clouds in their large-eddy ...
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 ...
Observed Microphysical Structure of Midlevel, Mixed-Phase Clouds
Publisher: American Meteorological Society
Abstract: This paper analyzes airborne measurements of six midlevel clouds observed over the Great Plains of the United States in late 1999 and early 2000 during the fifth of the Complex Layered-Cloud Experiments (CLEX-5). Data show ...
Higher-Order Turbulence Closure and Its Impact on Climate Simulations in the Community Atmosphere Model
Publisher: American Meteorological Society
Abstract: his paper describes climate simulations of the Community Atmosphere Model, version 5 (CAM5), coupled with a higher-order turbulence closure known as Cloud Layers Unified by Binormals (CLUBB). CLUBB is a unified parameterization ...