Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4121-4140 of 13215
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Large-Eddy Simulation of Moist Convection during a Cold Air Outbreak over the Gulf Stream
(American Meteorological Society, 2009)Cold air outflow over the Gulf Stream is modeled using a cloud-resolving large-eddy simulation model with three classes of precipitation. Simulations are conducted in a quasi-Lagrangian framework using an idealized sounding ... -
Metastable Decomposition of High-Dimensional Meteorological Data with Gaps
(American Meteorological Society, 2008)This paper presents an extension of the recently developed method for simultaneous dimension reduction and metastability analysis of high-dimensional time series. The modified approach is based on a combination of ensembles ... -
On the Analysis of Mean Downward Velocities around the Antarctic Polar Vortex
(American Meteorological Society, 2008)The Lagrangian characteristics of vertical motions around the Antarctic polar vortex are investigated using a general circulation model (GCM) and various analysis methods. A trace analysis that estimated the vertical ... -
Composite Life Cycle of Maritime Tropical Mesoscale Convective Systems in Scatterometer and Microwave Satellite Observations
(American Meteorological Society, 2009)This study examines scatterometer-observed surface wind divergence and vorticity, along with precipitable water (PW), across the life cycle of tropical maritime mesoscale convective systems (MCSs) as resolved in 0.5° data. ... -
Retrievals of Thick Cloud Optical Depth from the Geoscience Laser Altimeter System (GLAS) by Calibration of Solar Background Signal
(American Meteorological Society, 2008)Laser beams emitted from the Geoscience Laser Altimeter System (GLAS), as well as other spaceborne laser instruments, can only penetrate clouds to a limit of a few optical depths. As a result, only optical depths of thinner ... -
The Effect of Topography on Storm-Track Intensity in a Relatively Simple General Circulation Model
(American Meteorological Society, 2009)The effect of topography on storm-track intensity is examined with a set of primitive equation model integrations. This effect is found to be crucially dependent on the latitudinal structure of the background flow impinging ... -
How Do Outer Spiral Rainbands Affect Tropical Cyclone Structure and Intensity?
(American Meteorological Society, 2009)A long-standing issue on how outer spiral rainbands affect the structure and intensity of tropical cyclones is studied through a series of numerical experiments using the cloud-resolving tropical cyclone model TCM4. Because ... -
Comments on “Issues Regarding the Assimilation of Cloud and Precipitation Data”
(American Meteorological Society, 2008) -
Vortex-Driven Sensitivity in Deformation Flow
(American Meteorological Society, 2008)A sensitivity mechanism for the interaction of two vortices in a two-dimensional deformation background flow is explored. A nonlinear model describing the vortex interaction up to a critical merging distance is developed. ... -
The Role of Radiation in Influencing Tropical Cloud Distributions in a Radiative–Convective Equilibrium Cloud-Resolving Model
(American Meteorological Society, 2009)Observations by Johnson et al. depict regions of active tropical convection as possessing increased relative humidity through a deep layer and reduced low-level static stability when compared to nonconvecting regions. ... -
Turbulent Condensation of Droplets: Direct Simulation and a Stochastic Model
(American Meteorological Society, 2009)The effect of turbulent mixing on droplet condensation is studied via direct numerical simulations of a population of droplets in a periodic box of homogeneous isotropic turbulence. Each droplet is tracked as a fluid ... -
Sensitivity of the Upper Mesosphere to the Lorenz Energy Cycle of the Troposphere
(American Meteorological Society, 2009)The concept of a mechanistic general circulation model that explicitly simulates the gravity wave drag in the extratropical upper mesosphere in a self-consistent fashion is proposed. The methodology consists of 1) a standard ... -
Gravity Wave Instability Dynamics at High Reynolds Numbers. Part II: Turbulence Evolution, Structure, and Anisotropy
(American Meteorological Society, 2009)This paper examines the character, intermittency, and anisotropy of turbulence accompanying wave instability, breaking, and turbulence evolution and decay for gravity waves (GW) having a high intrinsic frequency, amplitudes ... -
Multidimensional Longwave Forcing of Boundary Layer Cloud Systems
(American Meteorological Society, 2008)The importance of multidimensional (MD) longwave radiative effects on cloud dynamics is evaluated in an eddy-resolving model (ERM)?the two-dimensional analog to large-eddy simulation (LES)?framework employing multidimensional ... -
The Effects of Critical Layers on Residual Layer Turbulence
(American Meteorological Society, 2009)The authors report results of a study of finescale turbulence structure in the portion of the nocturnal boundary layer known as the residual layer (RL). The study covers two nights during the Cooperative Atmosphere?Surface ... -
Gravity Wave Instability Dynamics at High Reynolds Numbers. Part I: Wave Field Evolution at Large Amplitudes and High Frequencies
(American Meteorological Society, 2009)Direct numerical simulations are employed to examine gravity wave instability dynamics at a high intrinsic frequency, wave amplitudes both above and below nominal convective instability, and a Reynolds number sufficiently ... -
Diminutive Frontal Waves—A Link between Fronts and Cyclones
(American Meteorological Society, 2009)A number of recent publications have dealt with cyclone identification and tracking. Following on, this paper extends the typical cyclone life cycle back in time to embrace a new feature called a ?diminutive frontal wave.? ... -
The Angular Momentum Budget of the Transformed Eulerian Mean Equations
(American Meteorological Society, 2008)The axial angular momentum (AAM) budget of zonal atmospheric annuli extending from the surface to a given height and over meridional belts is discussed within the framework of conventional and transformed Eulerian mean ... -
Internal Control of Hurricane Intensity Variability: The Dual Nature of Potential Vorticity Mixing
(American Meteorological Society, 2009)In hurricane eyewalls, the vertical stretching effect tends to produce an annular ring of high vorticity. Idealized, unforced nondivergent barotropic model results have suggested such rings of vorticity are often barotropically ... -
The Kelvin versus the Raoult Term in the Köhler Equation
(American Meteorological Society, 2008)A comprehensive sensitivity study was carried out examining the sensitivity of hygroscopic growth and activation as modeled with the Köhler equation. Different parameters in the Köhler equation were varied within the range ...