Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1641-1660 of 13215
-
Inverse Energy Cascades in an Eddy-Induced NAO-Type Flow: Scale Interaction Mechanism
(American Meteorological Society, 2015)n this paper, based on a new wave?eddy interaction framework, the interaction mechanism between the North Atlantic Oscillation (NAO) and synoptic-scale eddies is revealed by using the analytical solutions of a two-scale ... -
A Numerical Study on the Attitudes and Aerodynamics of Freely Falling Hexagonal Ice Plates
(American Meteorological Society, 2015)he fall attitudes and the flow fields of falling hexagonal ice plates are studied by numerically solving the transient incompressible Navier?Stokes equation for flow past ice plates and the body dynamics equations representing ... -
Evaluation of Subgrid-Scale Hydrometeor Transport Schemes Using a High-Resolution Cloud-Resolving Model
(American Meteorological Society, 2015)otential ways of parameterizing vertical turbulent fluxes of hydrometeors are examined using a high-resolution simulation of continental deep convection. The cloud-resolving model uses a double-moment microphysics scheme ... -
Isentropic Analysis of a Simulated Hurricane
(American Meteorological Society, 2015)urricanes, like many other atmospheric flows, are associated with turbulent motions over a wide range of scales. Here the authors adapt a new technique based on the isentropic analysis of convective motions to study the ... -
Contributions of Surface Sensible Heat Fluxes to Tropical Cyclone. Part II: The Sea Spray Processes
(American Meteorological Society, 2015)n Part II of this study, the roles of surface sensible heat fluxes (SHX) in tropical cyclones (TCs) are further investigated in the context of sea spray processes. Results show that the sea spray evaporation is favorable ... -
On the Convective Coupling and Moisture Organization of East Pacific Easterly Waves
(American Meteorological Society, 2015)rocesses associated with the local amplification of easterly waves (EWs) in the east Pacific warm pool are explored. Developing EWs favor convection in the southwest and northeast quadrants of the disturbance. In nascent ... -
Numerical Experiments to Analyze Cloud Microphysical Processes Depicted in Vertical Profiles of Radar Reflectivity of Warm Clouds
(American Meteorological Society, 2015)nformation about microphysical processes in warm clouds embedded in satellite measurements must be untangled to be used to improve the parameterization in global models. In this paper, the relationship between vertical ... -
MSE Minus CAPE is the True Conserved Variable for an Adiabatically Lifted Parcel
(American Meteorological Society, 2015)or an adiabatic parcel convecting up or down through the atmosphere, it is often assumed that its moist static energy (MSE) is conserved. Here, it is shown that the true conserved variable for this process is MSE minus ... -
Immersion Freezing of Kaolinite: Scaling with Particle Surface Area
(American Meteorological Society, 2015)his study presents an analysis showing that the freezing probability of kaolinite particles from Fluka scales exponentially with particle surface area for different atmospherically relevant particle sizes. Immersion freezing ... -
Improving Parameterization of Entrainment Rate for Shallow Convection with Aircraft Measurements and Large-Eddy Simulation
(American Meteorological Society, 2015)his work examines the relationships of entrainment rate to vertical velocity, buoyancy, and turbulent dissipation rate by applying stepwise principal component regression to observational data from shallow cumulus clouds ... -
An Ensemble Approach to Investigate Tropical Cyclone Intensification in Sheared Environments. Part I: Katia (2011)
(American Meteorological Society, 2015)he mechanisms responsible for tropical cyclone (TC) intensification in the presence of moderate vertical shear magnitudes are not well understood. To investigate how TCs intensify in spite of moderate shear, this study ... -
Convective Self-Aggregation and Tropical Cyclogenesis under the Hypohydrostatic Rescaling
(American Meteorological Society, 2015)he behavior of rotating and nonrotating aggregated convection is examined at various horizontal resolutions using the hypohydrostatic, or reduced acceleration in the vertical (RAVE), rescaling. This modification of the ... -
Idealized Numerical Experiments on Cyclone Development in the Tropical, Subtropical, and Extratropical Environments
(American Meteorological Society, 2015)he development of cyclones, particularly in the Southern Hemisphere summer, is active in the tropics and extratropics but is inactive in the subtropics. To elucidate the influence of environmental fields on the cyclone ... -
Gravity Wave–Induced Anomalous Potential Vorticity Gradient Generating Planetary Waves in the Winter Mesosphere
(American Meteorological Society, 2015)his study shows that gravity wave (GW) forcing (GWF) plays a crucial role in the barotropic/baroclinic instability that is frequently observed in the mesosphere and considered an origin of planetary waves (PWs) such as ... -
Lagrangian Droplet Dynamics in the Subsiding Shell of a Cloud Using Direct Numerical Simulations
(American Meteorological Society, 2015)his study investigates the droplet dynamics at the lateral cloud?environment interface in shallow cumulus clouds. A mixing layer is used to study a small part of the cloud edge using direct numerical simulation combined ... -
Impacts of Updraft Size and Dimensionality on the Perturbation Pressure and Vertical Velocity in Cumulus Convection. Part II: Comparison of Theoretical and Numerical Solutions and Fully Dynamical Simulations
(American Meteorological Society, 2015)his paper compares simple theoretical expressions relating vertical velocity, perturbation pressure, updraft size, and dimensionality for cumulus convection, derived in Part I, with numerical solutions of the anelastic ... -
Sticky Thermals: Evidence for a Dominant Balance between Buoyancy and Drag in Cloud Updrafts
(American Meteorological Society, 2015)he vertical velocities of convective clouds are of great practical interest because of their influence on many phenomena, including severe weather and stratospheric moistening. However, the magnitudes of forces giving rise ... -
Impacts of Updraft Size and Dimensionality on the Perturbation Pressure and Vertical Velocity in Cumulus Convection. Part I: Simple, Generalized Analytic Solutions
(American Meteorological Society, 2015)his study investigates relationships between vertical velocity, perturbation pressure, updraft size, and dimensionality for cumulus convection. Generalized theoretical expressions are derived from approximate analytic ... -
A Momentum Budget Analysis of Westerly Wind Events Associated with the Madden–Julian Oscillation during DYNAMO
(American Meteorological Society, 2015)he Dynamics of the Madden?Julian Oscillation (DYNAMO) field campaign was conducted over the Indian Ocean (IO) from October 2011 to February 2012 to investigate the initiation of the Madden?Julian oscillation (MJO). Three ... -
Large-Eddy Simulations and Damped-Oscillator Models of the Unsteady Ekman Boundary Layer
(American Meteorological Society, 2015)he Ekman boundary layer (EBL) is a central problem in geophysical fluid dynamics that emerges when the pressure gradient force, the Coriolis force, and the frictional force interact in a flow. The unsteady version of the ...