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RISEvolution of Snow-Size Spectra in Cyclonic Storms. Part I: Snow Growth by Vapor Deposition and Aggregation
Publisher: American Meteorological Society
Abstract: Based on the stochastic collection equation, height- and time-dependent snow growth models were developed for unrimed stratiform snowfall. Moment conservation equations were parameterized and solved by constraining the ...
A Model Predicting the Evolution of Ice Particle Size Spectra and Radiative Properties of Cirrus Clouds. Part I: Microphysics
Publisher: American Meteorological Society
Abstract: A Lagrangian time-dependent three-dimensional model was developed that predicts the evolution of ice particle size spectra in cirrus clouds in terms of the growth processes of vapor diffusion and aggregation, as well as ...
Evolution of Snow-Size Spectra in Cyclonic Storms. Part II: Deviations from the Exponential Form
Publisher: American Meteorological Society
Abstract: Using a form of the stochastic collection equation, conservation equations for the first and second moments of the mass were parameterized to yield a height dependent one-dimensional snow growth model for unrimed stratiform ...
Parameterization of the Mie Extinction and Absorption Coefficients for Water Clouds
Publisher: American Meteorological Society
Abstract: It was found that the anomalous diffraction approximation (ADA) could be made to approximate Mie theory for absorption and extinction in water clouds by parameterizing the missing physics: 1) internal reflection/refraction, ...
Use of Mass- and Area-Dimensional Power Laws for Determining Precipitation Particle Terminal Velocities
Publisher: American Meteorological Society
Abstract: Based on boundary layer theory and a comparison of empirical power laws relating the Reynolds and Best numbers, it was apparent that the primary variables governing a hydrometeor's terminal velocity were its mass, its area ...
Effective Diameter in Radiation Transfer: General Definition, Applications, and Limitations
Publisher: American Meteorological Society
Abstract: Although the use of an effective radius for radiation transfer calculations in water clouds has been common for many years, the export of this concept to ice clouds has been fraught with uncertainty, due to the nonspherical ...
A Model Predicting the Evolution of Ice Particle Size Spectra and Radiative Properties of Cirrus Clouds. Part II: Dependence of Absorption and Extinction on Ice Crystal Morphology
Publisher: American Meteorological Society
Abstract: This study builds upon the microphysical modeling described in Part I by deriving formulations for the extinction and absorption coefficients in terms of the size distribution parameters predicted from the microphysical ...
Modeling Cirrus Clouds. Part II: Treatment of Radiative Properties
Publisher: American Meteorological Society
Abstract: A new radiation scheme, suitable for two-stream radiation transfer models, was developed for cirrus clouds. Analytical expressions were derived for the extinction and absorption coefficients and the asymmetry parameter. ...
Refinements in the Treatment of Ice Particle Terminal Velocities, Highlighting Aggregates
Publisher: American Meteorological Society
Abstract: Recent work on the terminal velocity of ice crystal aggregates suggests that their ?Re?X? relationship may not be well predicted by current theory. This study examines possible reasons for this departure from theory, and ...
Inferring Cirrus Size Distributions through Satellite Remote Sensing and Microphysical Databases
Publisher: American Meteorological Society
Abstract: Since cirrus clouds have a substantial influence on the global energy balance that depends on their microphysical properties, climate models should strive to realistically characterize the cirrus ice particle size distribution ...