Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2341-2360 of 13215
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A Satellite Study of Tropical Moist Convection and Environmental Variability: A Moisture and Thermal Budget Analysis
(American Meteorological Society, 2013)he thermodynamic variability associated with moist convection over tropical oceans is analyzed by making use of a variety of satellite sensors including radars, an infrared and microwave sounder unit, and a microwave ... -
Tracer Dispersion in the Turbulent Convective Layer
(American Meteorological Society, 2013)xperimental results for passive tracer dispersion in the turbulent surface layer under convective conditions are presented. In this case, the dispersion of tracer particles is determined by the interplay of two mechanisms: ... -
Aerosol Effects on Simulated Storm Electrification and Precipitation in a Two-Moment Bulk Microphysics Model
(American Meteorological Society, 2013)he effects of cloud condensation nuclei (CCN) concentrations are found to strongly affect the microphysical and electrical evolution of a numerically simulated small multicell storm. The simulations reproduce the well-known ... -
Squall-Line Intensification via Hydrometeor Recirculation
(American Meteorological Society, 2013)any studies have demonstrated the intimate connection between microphysics and deep moist convection, especially for squall lines via cold pool pathways. The present study examines four numerically simulated idealized ... -
Environment and the Lifetime of Tropical Deep Convection in a Cloud-Permitting Regional Model Simulation
(American Meteorological Society, 2013)y applying a cloud-tracking algorithm to tropical convective systems in a regional high-resolution model simulation, this study documents the environmental conditions before and after convective systems are initiated over ... -
Local Dynamics of Baroclinic Waves in the Martian Atmosphere
(American Meteorological Society, 2013)he paper investigates the processes that drive the spatiotemporal evolution of baroclinic transient waves in the Martian atmosphere by a simulation experiment with the Geophysical Fluid Dynamics Laboratory (GFDL) Mars ... -
Effect of Aerosol on Cloud–Environment Interactions in Trade Cumulus
(American Meteorological Society, 2012)his study examines the role of aerosol in mediating interactions between a warm trade cumulus cloud system and the environment that spawns it. Numerical simulations of the observed and well-studied Rain in Cumulus over the ... -
Ozone Loss and Recovery and the Preconditioning of Upward-Propagating Planetary Wave Activity
(American Meteorological Society, 2013)mechanistic chemistry?dynamical model is used to evaluate the relative importance of radiative, photochemical, and dynamical feedbacks in communicating changes in lower-stratospheric ozone to the circulation of the ... -
Triggered Convection, Gravity Waves, and the MJO: A Shallow-Water Model
(American Meteorological Society, 2013)he Madden?Julian oscillation (MJO) is the dominant mode of intraseasonal variability in the tropics. Despite its primary importance, a generally accepted theory that accounts for fundamental features of the MJO, including ... -
A New Wall Shear Stress Model for Atmospheric Boundary Layer Simulations
(American Meteorological Society, 2013)new wall shear stress model to be used as a wall boundary condition for large-eddy simulations of the atmospheric boundary layer is proposed. The new model computes the wall shear stress and the vertical derivatives of the ... -
On Adding Thermodynamic Damping Mechanisms to Refine Two Classical Models of Katabatic Winds
(American Meteorological Society, 2013)he Prandtl and layer-averaged models of katabatic winds contain some nonphysical singularities in the analytical solutions, which give unbounded steady flow anomalies at zero slope angles or adiabatic lapse rates. This ... -
How Does the Eye Warm? Part II: Sensitivity to Vertical Wind Shear and a Trajectory Analysis
(American Meteorological Society, 2013)n Part II of this study, idealized simulations of tropical cyclones are used to investigate the influence of vertical wind shear on the structure of warming and descent in the eye; results are compared with the no-shear ... -
Exploring the Mechanisms of Ice Nucleation on Kaolinite: From Deposition Nucleation to Condensation Freezing
(American Meteorological Society, 2013)o identify the temperature and humidity conditions at which different ice nucleation mechanisms are active, the authors conducted experiments on 200-, 400-, and 800-nm size-selected kaolinite particles, exposing them to ... -
Indications of Stratified Turbulence in a Mechanistic GCM
(American Meteorological Society, 2012)he horizontal kinetic energy spectrum and its budget are analyzed on the basis of a general circulation model with simplistic parameterizations of radiative and latent heating. A spectral truncation at total wavenumber 330 ... -
A Dissection of Energetics of the Geostrophic Flow: Reconciliation of Rossby Wave Energy Flux and Group Velocity
(American Meteorological Society, 2013)t is shown in this paper that there is no ambiguity in the final form of the governing equations of a quasigeostrophic (QG) model after partitioning the total flow into the geostrophic, balanced ageostrophic, and unbalanced ... -
Delineating the Eddy–Zonal Flow Interaction in the Atmospheric Circulation Response to Climate Forcing: Uniform SST Warming in an Idealized Aquaplanet Model
(American Meteorological Society, 2013)he mechanisms of the atmospheric response to climate forcing are analyzed using an example of uniform SST warming in an idealized aquaplanet model. A 200-member ensemble of experiments is conducted with an instantaneous ... -
Dynamics of the Stratiform Sector of a Tropical Cyclone Rainband
(American Meteorological Society, 2012)irborne Doppler radar documented the stratiform sector of a rainband within the stationary rainband complex of Hurricane Rita. The stratiform rainband sector is a mesoscale feature consisting of nearly uniform precipitation ... -
Predictability and Dynamics of a Nonintensifying Tropical Storm: Erika (2009)
(American Meteorological Society, 2013)n this study, the predictability of Tropical Storm Erika (2009) is evaluated by analyzing a 60-member convection-permitting ensemble initialized with perturbations from a real-time ensemble Kalman filter (EnKF) system. ... -
Connections between the Spring Breakup of the Southern Hemisphere Polar Vortex, Stationary Waves, and Air–Sea Roughness
(American Meteorological Society, 2013)robust connection between the drag on surface-layer winds and the stratospheric circulation is demonstrated in NASA's Goddard Earth Observing System Chemistry?Climate Model (GEOSCCM). Specifically, an updated parameterization ... -
Formation and Maintenance of Nocturnal Low-Level Stratus over the Southern West African Monsoon Region during AMMA 2006
(American Meteorological Society, 2013)he southern parts of West Africa are frequently covered by an extensive deck of shallow, low (200?400 m AGL) stratus or stratocumulus clouds during the summer monsoon. These clouds usually form at night in association with ...