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On the Growth of Layers of Nonprecipitating Cumulus Convection
Publisher: American Meteorological Society
Abstract: A prototype problem of a nonprecipitating convective layer growing into a layer of uniform stratification and exponentially decreasing humidity is introduced to study the mechanism by which the cumulus-topped boundary layer ...
Quasi-Steady Analysis of a PBL Model with an Eddy-Diffusivity Profile and Nonlocal Fluxes
Publisher: American Meteorological Society
Abstract: Analytic solutions to a planetary boundary layer (PBL) model with an eddy-diffusivity profile (i.e., a K profile) and nonlocal fluxes are presented for the quasi-steady regime. The solutions demonstrate how different ...
Rethinking the Lower Bound on Aerosol Radiative Forcing
Publisher: American Meteorological Society
Abstract: ased on research showing that in the case of a strong aerosol forcing, this forcing establishes itself early in the historical record, a simple model is constructed to explore the implications of a strongly negative aerosol ...
Reply to “Comment on ‘Rethinking the Lower Bound on Aerosol Radiative Forcing’”
Publisher: American Meteorological Society
Abstract: AbstractKretzschmar et al., in a comment in 2017, use the spread in the output of aerosol?climate models to argue that the models refute the hypothesis (presented in a paper by Stevens in 2015) that for the mid-twentieth-century ...
Top-Hat Representation of Turbulence Statistics in Cloud-Topped Boundary Layers: A Large Eddy Simulation Study
Publisher: American Meteorological Society
Abstract: Large eddy simulation is used to study top-hat parameterizations of second- and third-order scalar statistics in cumulus and stratocumulus cloud-topped boundary layers (CTBLs). Although the top-hat parameterizations based ...
Using the Sensitivity of Large-Eddy Simulations to Evaluate Atmospheric Boundary Layer Models
Publisher: American Meteorological Society
Abstract: simple framework to study the sensitivity of atmospheric boundary layer (ABL) models to the large-scale conditions and forcings is introduced. This framework minimizes the number of parameters necessary to describe the ...
Microphysical Scaling Relations in a Kinematic Model of Isolated Shallow Cumulus Clouds
Publisher: American Meteorological Society
Abstract: The rain formation in shallow cumulus clouds by condensational growth and collision?coalescence of liquid drops is revisited with the aim of understanding the controls on precipitation efficiency for idealized cloud drafts. ...
The Echo Size Distribution of Precipitating Shallow Cumuli
Publisher: American Meteorological Society
Abstract: S-band radar surveillance scans of precipitating shallow convection are analyzed. The scans are complied from 52 days of near-continuous measurements in the winter trades of the North Atlantic during the Rain in Cumulus ...
Preconditioning Deep Convection with Cumulus Congestus
Publisher: American Meteorological Society
Abstract: ecent studies have pushed forward the idea that congestus clouds, through their moistening of the atmosphere, could promote deep convection. On the other hand, older studies have tended to relate convective initiation to ...
Time Scales of the Trade Wind Boundary Layer Adjustment
Publisher: American Meteorological Society
Abstract: he adjustment of the trade wind atmospheric boundary layer to an abrupt sea surface warming is investigated using a large-eddy simulation (LES) and two simple bulk models: a mixed-layer model (MLM), and a model based on ...