Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4321-4340 of 13215
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Comments on “The Mysteries of Mammatus Clouds: Observations and Formation Mechanisms”
(American Meteorological Society, 2008) -
Modeling the Interaction between Cumulus Convection and Linear Gravity Waves Using a Limited-Domain Cloud System–Resolving Model
(American Meteorological Society, 2008)A limited-domain cloud system?resolving model (CSRM) is used to simulate the interaction between cumulus convection and two-dimensional linear gravity waves, a single horizontal wavenumber at a time. With a single horizontal ... -
The Gradient Genesis of Stratospheric Trace Species in the Subtropics and around the Polar Vortex
(American Meteorological Society, 2008)Mechanisms that control the formation and decay of meridional gradients in stratospheric trace species in the subtropics and around the polar vortex are investigated using a gradient genesis equation that uses mass-weighted ... -
Growth of Cloud Droplets by Turbulent Collision–Coalescence
(American Meteorological Society, 2008)An open question in cloud physics is how rain forms in warm cumulus as rapidly as it is sometimes observed. In particular, the growth of cloud droplets across the size gap from 10 to 50 ?m in radius has not been fully ... -
Predictable Components and Singular Vectors
(American Meteorological Society, 2008)This paper shows that if a measure of predictability is invariant to affine transformations and monotonically related to forecast uncertainty, then the component that maximizes this measure for normally distributed variables ... -
On the Wavelength of the Rossby Waves Radiated by Tropical Cyclones
(American Meteorological Society, 2008)The authors present a theory for the zonal wavelength of tropical depression?type disturbances, which occur as a result of Rossby wave radiation from a preexisting tropical cyclone (TC). In some cases, such disturbances ... -
Parameter Sweep Experiments on Spontaneous Gravity Wave Radiation from Unsteady Rotational Flow in an f-Plane Shallow Water System
(American Meteorological Society, 2008)Inertial gravity wave radiation from an unsteady rotational flow (spontaneous radiation) is investigated numerically in an f-plane shallow water system for a wide range of Rossby numbers, 1 ≤ Ro ≤ 1000, and Froude numbers, ... -
Temperature Phase Tilt in Unstable Baroclinic Waves
(American Meteorological Society, 2007)A general property on the phase relation in linear baroclinic instability is proved analytically: in a potential vorticity homogenization regime, the complex geometry of the quasigeostrophic equations determines that the ... -
Determination of the Combined Ventilation Factor and Capacitance for Ice Crystal Aggregates from Airborne Observations in a Tropical Anvil Cloud
(American Meteorological Society, 2008)The ventilation factor and capacitance used in numerical models to represent ice crystal aggregates directly affects the growth rate of the ice crystal aggregates, and consequently the sink of atmospheric water vapor. ... -
Dynamic Models for the Subgrid-Scale Mixing of Reactants in Atmospheric Turbulent Reacting Flows
(American Meteorological Society, 2008)The effects of the subgrid scales on chemical transformations in large-eddy simulations of the convective atmospheric boundary layer (CBL) are investigated. Dynamic similarity subgrid-scale models are formulated and used ... -
Convectively Coupled Equatorial Waves Simulated on an Aquaplanet in a Global Nonhydrostatic Experiment
(American Meteorological Society, 2008)Large-scale tropical convective disturbances simulated in a 7-km-mesh aquaplanet experiment are investigated. A 40-day simulation was executed using the Nonhydrostatic Icosahedral Atmospheric Model (NICAM). Two scales of ... -
Resonant Response of Deep Convection to Surface Hot Spots
(American Meteorological Society, 2008)Observations show substantial variations of the intensity of tropical and/or summertime deep convection on land that are not explained by standard measures of convective instability. One feature that distinguishes land ... -
Seasonal Variation of Cloud Systems over ARM SGP
(American Meteorological Society, 2008)Increased observational analyses provide a unique opportunity to perform years-long cloud-resolving model (CRM) simulations and generate long-term cloud properties that are very much in demand for improving the representation ... -
Time Scale and Feedback of Zonal-Mean-Flow Variability
(American Meteorological Society, 2008)The physical processes that determine the time scale of zonal-mean-flow variability are examined with an idealized numerical model that has a zonally symmetric lower boundary. In the part of the parameter space where the ... -
Midlatitude Static Stability in Simple and Comprehensive General Circulation Models
(American Meteorological Society, 2008)The static stability of the extratropical troposphere is examined in two atmospheric general circulation models (GCMs) over idealized boundary conditions, with emphasis on the role of moisture in determining the midlatitude ... -
Nonlinear Generalization of Singular Vectors: Behavior in a Baroclinic Unstable Flow
(American Meteorological Society, 2008)Singular vector (SV) analysis has proved to be helpful in understanding the linear instability properties of various types of flows. SVs are the perturbations with the largest amplification rate over a given time interval ... -
Infrasound Emitted by Tornado-Like Vortices: Basic Theory and a Numerical Comparison to the Acoustic Radiation of a Single-Cell Thunderstorm
(American Meteorological Society, 2008)This paper addresses the physics and numerical simulation of the adiabatic generation of infrasound by tornadoes. Classical analytical results regarding the production of infrasound by vortex Rossby waves and by corotating ... -
Impact of the Atmospheric Boundary Layer on Mountain Waves
(American Meteorological Society, 2008)Interaction between mountain waves and the atmospheric boundary layer (BL) has been investigated using a mesoscale model with BL parameterizations and analytical BL models. The impact of the BL diagnosed from the mesoscale ... -
Modeling Supersaturation and Subgrid-Scale Mixing with Two-Moment Bulk Warm Microphysics
(American Meteorological Society, 2008)This paper describes further developments of a two-moment warm rain bulk microphysics scheme suitable for addressing the indirect impact of atmospheric aerosols on ice-free clouds in large-eddy simulation (LES) models. The ... -
Another Look at the Influence of Absorbing Aerosols in Drops on Cloud Absorption: Large Aerosols
(American Meteorological Society, 2008)Since as early as 1969, solar absorbing aerosols inside of cloud drops have been suggested to influence cloud radiative properties. The absorbing aerosols were invoked to help explain two ?anomalies?: 1) the maximum visible ...