Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4281-4300 of 13215
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A Novel Approach for Representing Ice Microphysics in Models: Description and Tests Using a Kinematic Framework
(American Meteorological Society, 2008)This paper documents the development of a novel approach for representing ice microphysics in numerical models. In this approach, the ice particle mass?dimension and projected-area?dimension relationships vary as a function ... -
Investigation of Droplet Size Distributions and Drizzle Formation Using a New Trajectory Ensemble Model. Part I: Model Description and First Results in a Nonmixing Limit
(American Meteorological Society, 2008)A novel trajectory ensemble model of a stratocumulus cloud is described. In this model, the boundary layer (BL) is fully covered by a great number of Lagrangian air parcels that during their motion can contain either wet ... -
The Spontaneous Imbalance of an Atmospheric Vortex at High Rossby Number
(American Meteorological Society, 2008)This paper discusses recent progress toward understanding the instability of a monotonic vortex at high Rossby number, due to the radiation of spiral inertia?gravity (IG) waves. The outward-propagating IG waves are excited ... -
Analytical Solutions to the Stochastic Kinetic Equation for Liquid and Ice Particle Size Spectra. Part II: Large-Size Fraction in Precipitating Clouds
(American Meteorological Society, 2008)The stochastic kinetic equation is solved analytically for precipitating particles that can be identified as rain, snow, and graupel. The general solution for the size spectra of the large-size particles is represented by ... -
Sensitivity Studies of the Role of Aerosols in Warm-Phase Orographic Precipitation in Different Dynamical Flow Regimes
(American Meteorological Society, 2008)Aerosols serve as a source of cloud condensation nuclei (CCN) and influence the microphysical properties of clouds. In the case of orographic clouds, it is suspected that aerosol?cloud interactions reduce the amount of ... -
Hurricane Vortex Dynamics during Atlantic Extratropical Transition
(American Meteorological Society, 2008)Simulations of six Atlantic hurricanes are diagnosed to understand the behavior of realistic vortices in varying environments during the process of extratropical transition (ET). The simulations were performed in real time ... -
Vertical Motions in Arctic Mixed-Phase Stratiform Clouds
(American Meteorological Society, 2008)The characteristics of Arctic mixed-phase stratiform clouds and their relation to vertical air motions are examined using ground-based observations during the Mixed-Phase Arctic Cloud Experiment (MPACE) in Barrow, Alaska, ... -
Analytical Solutions to the Stochastic Kinetic Equation for Liquid and Ice Particle Size Spectra. Part I: Small-Size Fraction
(American Meteorological Society, 2008)The kinetic equation of stochastic condensation for cloud drop size spectra is extended to account for crystalline clouds and also to include the accretion?aggregation process. The size spectra are separated into small and ... -
Objective Identification of Nonlinear Convectively Coupled Phases of Monsoon Intraseasonal Oscillation: Implications for Prediction
(American Meteorological Society, 2008)The nonlinear convectively coupled character of the summer monsoon intraseasonal oscillation (ISO) that manifests in its event-to-event variations is a major hurdle for skillful extended-range prediction of the active/break ... -
Thermodynamic Consistency of the Anelastic Approximation for a Moist Atmosphere
(American Meteorological Society, 2008)The primary goal of this paper is to validate the use of the anelastic approximation for fluids with a complex equation of state such as moist air or seawater. The anelastic approximation is based on a leading-order expansion ... -
Tracking Gravity Waves in Baroclinic Jet-Front Systems
(American Meteorological Society, 2008)Using a two-dimensional Fourier decomposition and a four-dimensional ray-tracing technique, the propagating characteristics and source mechanisms of mesoscale gravity waves simulated in idealized baroclinic jet-front systems ... -
Vertically Propagating Kelvin Waves and Tropical Tropopause Variability
(American Meteorological Society, 2008)The relationship between local convection, vertically propagating Kelvin waves, and tropical tropopause height variability is examined. This study utilizes both simulations of a global primitive-equation model and global ... -
The Structure and Mesoscale Organization of Precipitating Stratocumulus
(American Meteorological Society, 2008)Large-eddy simulations are used to explore the structure and mesoscale organization of precipitating stratocumulus. The simulations incorporate a simple, two-moment, bulk representation of microphysical processes, which ... -
Arctic Mixed-Phase Clouds Simulated by a Cloud-Resolving Model: Comparison with ARM Observations and Sensitivity to Microphysics Parameterizations
(American Meteorological Society, 2008)Single-layer mixed-phase stratiform (MPS) Arctic clouds, which formed under conditions of large surface heat flux combined with general subsidence during a subperiod of the Atmospheric Radiation Measurement (ARM) Program?s ... -
On the Diurnal Variation of Mountain Waves
(American Meteorological Society, 2008)The diurnal variation of mountain waves and wave drag associated with flow past mesoscale ridges has been examined using the Coupled Ocean?Atmosphere Mesoscale Prediction System (COAMPS) and an analytical boundary layer ... -
A Low-Level Circulation in the Tropics
(American Meteorological Society, 2008)Deep convective tropical systems are strongly convergent in the midtroposphere. Horizontal wind measurements from a variety of rawinsonde arrays in the equatorial Pacific and Caribbean are used to calculate the mean dynamical ... -
Stably Stratified Flows: A Model with No Ri(cr)
(American Meteorological Society, 2008)A large set of laboratory, direct numerical simulation (DNS), and large eddy simulation (LES) data indicates that in stably stratified flows turbulent mixing exists up to Ri ? O(100), meaning that there is practically no ... -
Numerical Simulation of Mammatus
(American Meteorological Society, 2008)Mammatus are hanging lobes on the underside of clouds. Although many different mechanisms have been proposed for their formation, none have been rigorously tested. In this study, three-dimensional numerical simulations of ... -
Modeling of the Melting Layer. Part IV: Brightband Bulk Parameterization
(American Meteorological Society, 2008)In this paper a simplified UHF-band backscattering parameterization for individual melting snowflakes is proposed. This parameterization is a function of the density, shape, and melted fraction, and is used here in a ... -
Gravity Currents in a Deep Anelastic Atmosphere
(American Meteorological Society, 2008)This study presents analytic results for steady gravity currents in a channel using the deep anelastic equations. Results are cast in terms of a nondimensional parameter H/H0 that relates the channel depth H to a scale ...