Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3981-4000 of 13215
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Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part I: Detection with the Lyapunov Diffusivity
(American Meteorological Society, 2009)A new diagnostic (the ?Lyapunov diffusivity?) is presented that has the ability to quantify isentropic mixing in diffusion units and detects local mixing events by describing latitude?longitude variability. It is a hybrid ... -
Influence of the SST Rise on Baroclinic Instability Wave Activity under an Aquaplanet Condition
(American Meteorological Society, 2009)The influence of the sea surface temperature (SST) rise on extratropical baroclinic instability wave activity is investigated using an aquaplanet general circulation model (GCM). Two types of runs were performed: the High+3 ... -
The Impact of Outflow Environment on Tropical Cyclone Intensification and Structure
(American Meteorological Society, 2009)In this study, the impacts of regions of weak inertial stability on tropical cyclone intensification and peak strength are examined. It is demonstrated that weak inertial stability in the outflow layer minimizes an energy ... -
A Comparison of Tropical and Midlatitude Thunderstorm Evolution in Response to Wind Shear
(American Meteorological Society, 2009)The influence of vertical wind shear on storm development within a tropical environment is studied with the aid of two numerical models and compared with that in simulations of midlatitude storms. The simulations show that ... -
Simulated Electrification of a Small Thunderstorm with Two-Moment Bulk Microphysics
(American Meteorological Society, 2010)Electrification and lightning are simulated for a small continental multicell storm. The results are consistent with observations and thus provide additional understanding of the charging processes and evolution of this ... -
Planetary Scale Selection of the Madden–Julian Oscillation
(American Meteorological Society, 2009)Numerical experiments with a 2.5-layer and a 2-level model are conducted to examine the mechanism for the planetary scale selection of the Madden?Julian oscillation (MJO). The strategy here is to examine the evolution of ... -
Riming of Graupel: Wind Tunnel Investigations of Collection Kernels and Growth Regimes
(American Meteorological Society, 2009)Laboratory experiments were carried out in the vertical wind tunnel in Mainz, Germany, to study the collision coalescence growth of single spherical ice particles having initial radii between 290 and 380 ?m while they were ... -
Numerical Simulation of Cloud–Clear Air Interfacial Mixing: Homogeneous versus Inhomogeneous Mixing
(American Meteorological Society, 2009)This note presents an analysis of several dozens of direct numerical simulations of the cloud?clear air mixing in a setup of decaying moist turbulence with bin microphysics. The goal is to assess the instantaneous relationship ... -
Modulation of the Period of the Quasi-Biennial Oscillation by the Solar Cycle
(American Meteorological Society, 2009)The authors examine the mechanism of solar cycle modulation of the Quasi-Biennial Oscillation (QBO) period using the Two-and-a-Half-Dimensional Interactive Isentropic Research (THINAIR) model. Previous model results (using ... -
The Transition to Strong Convection
(American Meteorological Society, 2009)Recent work has shown that observations of tropical precipitation conform to properties associated with critical phenomena in other systems. Here some of these universal properties are used to probe the physics of tropical ... -
Turbulence Structure of the Hurricane Boundary Layer between the Outer Rainbands
(American Meteorological Society, 2009)As part of the Coupled Boundary Layers Air?Sea Transfer (CBLAST)-Hurricane program, flights were conducted to directly measure turbulent fluxes and turbulence properties in the high-wind boundary layer of hurricanes between ... -
Multiyear Evaluations of a Cloud Model Using ARM Data
(American Meteorological Society, 2009)This work uses long-term lidar and radar retrievals of the vertical structure of cloud at the Atmospheric Radiation Measurement (ARM) program?s Southern Great Plains site to evaluate cloud occurrence in multiyear runs of ... -
A PDF-Based Microphysics Parameterization for Simulation of Drizzling Boundary Layer Clouds
(American Meteorological Society, 2009)Formulating the contribution of subgrid-scale (SGS) variability to microphysical processes in boundary layer and deep convective cloud parameterizations is a challenging task because of the complexity of microphysical ... -
Investigation of Upstream Boundary Layer Influence on Mountain Wave Breaking and Lee Wave Rotors Using a Large-Eddy Simulation
(American Meteorological Society, 2009)Interactions between a turbulent boundary layer and nonlinear mountain waves are explored using a large-eddy simulation model. Simulations of a self-induced critical layer, which develop a stagnation layer and a strong ... -
Annular Variability and Eddy–Zonal Flow Interactions in a Simplified Atmospheric GCM. Part I: Characterization of High- and Low-Frequency Behavior
(American Meteorological Society, 2009)Experiments have been performed using a simplified, Newtonian forced, global circulation model to investigate how variability of the tropospheric jet can be characterized by examining the combined fluctuations of the two ... -
Statistics on High-Cloud Areas and Their Sensitivities to Cloud Microphysics Using Single-Cloud Experiments
(American Meteorological Society, 2009)Statistics on high-altitude cloud areas associated with deep cumulus clouds and their sensitivities to cloud microphysics are studied in the framework of single-cloud experiments with an explicit cloud system?resolving ... -
Morning-to-Afternoon Evolution of Marine Stratus Polluted by Underlying Ships: Implications for the Relative Lifetimes of Polluted and Unpolluted Clouds
(American Meteorological Society, 2009)Ship tracks appearing in both the morning and afternoon Moderate Resolution Imaging Spectroradiometer (MODIS) imagery for the Pacific Ocean off the west coast of the United States were used to study the morning-to-afternoon ... -
Emergence of Jets from Turbulence in the Shallow-Water Equations on an Equatorial Beta Plane
(American Meteorological Society, 2009)Coherent jets, such as the Jovian banded winds, are a prominent feature of rotating turbulence. Shallow-water turbulence models capture the essential mechanism of jet formation, which is systematic eddy momentum flux ... -
Observational Study of Marine Atmospheric Boundary Layer Characteristics during Swell
(American Meteorological Society, 2009)By combining simultaneous data from an instrumented Air?Sea Interaction Spar (ASIS) buoy and a 30-m tower, profiles of wind and turbulence characteristics have been obtained at several heights from about 1 to 30 m above ... -
Modeling of Subgrid-Scale Mixing in Large-Eddy Simulation of Shallow Convection
(American Meteorological Society, 2009)This paper discusses an extension of the approach proposed previously to represent the delay of cloud water evaporation and buoyancy reversal due to the cloud?environment mixing in bulk microphysics large-eddy simulation ...