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A Wavenumber–Frequency Spectrum Model for Sheared Convective Atmospheric Boundary Layer Flows
Publisher: American Meteorological Society
New Insights into Wind Shear Effects on Entrainment in Convective Boundary Layers Using Conditional Analysis
Publisher: American Meteorological Society
Abstract: Conventional analysis has shown that strong wind shear enhances the entrainment buoyancy flux in the convective boundary layer. By conditioning the entrainment zone into regions of turbulent (i.e., strongly vortical) and ...
Wind Shear Effects on Radiatively and Evaporatively Driven Stratocumulus Tops
Publisher: American Meteorological Society
Abstract: AbstractDirect numerical simulations resolving meter and submeter scales in the cloud-top region of stratocumulus are used to investigate the interactions between a mean vertical wind shear and in-cloud turbulence driven ...
Growth and Decay of a Convective Boundary Layer over a Surface with a Constant Temperature
Publisher: American Meteorological Society
Abstract: he growth and decay of a convective boundary layer (CBL) over a surface with a constant surface temperature that develops into a linear stratification is studied, and a mathematical model for this system is derived. The ...
Reduction of the Entrainment Velocity by Cloud Droplet Sedimentation in Stratocumulus
Publisher: American Meteorological Society
Abstract: AbstractThe effect of sedimentation on stratocumulus entrainment is investigated using direct numerical simulations of a cloud-top mixing layer driven by radiative and evaporative cooling. The simulations focus on the meter ...
Direct Numerical Simulations of a Smoke Cloud–Top Mixing Layer as a Model for Stratocumuli
Publisher: American Meteorological Society
Abstract: radiatively driven cloud-top mixing layer is investigated using direct numerical simulations. This configuration mimics the mixing process across the inversion that bounds the stratocumulus-topped boundary layer. The main ...
Mixing Driven by Radiative and Evaporative Cooling at the Stratocumulus Top
Publisher: American Meteorological Society
Abstract: he stratocumulus-top mixing process is investigated using direct numerical simulations of a shear-free cloud-top mixing layer driven by evaporative and radiative cooling. An extension of previous linear formulations allows ...
The Two-Layer Structure of the Entrainment Zone in the Convective Boundary Layer
Publisher: American Meteorological Society
Abstract: he entrainment zone (EZ) of a dry, shear-free convective boundary layer growing into a linearly stratified fluid is studied by means of direct numerical simulation. The scale separation between the boundary layer thickness ...
Wind Shear and Buoyancy Reversal at the Top of Stratocumulus
Publisher: American Meteorological Society
Abstract: numerical experiment is designed to study the interaction at the stratocumulus top between a mean vertical shear and the buoyancy reversal due to evaporative cooling, without radiative cooling. Direct numerical simulation ...
Direct Numerical Simulation of Evaporative Cooling at the Lateral Boundary of Shallow Cumulus Clouds
Publisher: American Meteorological Society
Abstract: his study investigates the dynamics of the subsiding shell at the lateral boundary of cumulus clouds, focusing on the role of evaporative cooling. Since the size of this shell is well below what large-eddy simulations can ...