Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2801-2820 of 13215
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Breaking Waves at the Tropopause in the Wintertime Northern Hemisphere: Climatological Analyses of the Orientation and the Theoretical LC1/2 Classification
(American Meteorological Society, 2007)Breaking waves on the tropopause are viewed as potential vorticity (PV) streamers on middle-world isentropic levels. A Northern Hemisphere winter climatology of the streamers? spatial distribution and meridional orientation ... -
Multiscale Models with Moisture and Systematic Strategies for Superparameterization
(American Meteorological Society, 2007)The accurate parameterization of moist convection presents a major challenge for the accurate prediction of weather and climate through numerical models. Superparameterization is a promising recent alternative strategy for ... -
A New Surface Model for β-Plane Turbulence
(American Meteorological Society, 2007)This paper introduces a new numerical model for studying wave?turbulence interactions in a continuously stratified rotating flow, having a uniform potential vorticity and a rigid boundary. The meridional variation in the ... -
Transient Mountain Waves and Their Interaction with Large Scales
(American Meteorological Society, 2007)The impact of transient mountain waves on a large-scale flow is examined through idealized numerical simulations of the passage of a time-evolving synoptic-scale jet over an isolated 3D mountain. Both the global momentum ... -
Influence of Doubled CO2 on Ozone via Changes in the Brewer–Dobson Circulation
(American Meteorological Society, 2007)In this short note, the effect of enhanced circulation due to doubling CO2 on ozone is investigated. The difference of Brewer?Dobson circulation (BDC) between the doubled CO2 and control run from an idealized atmospheric ... -
The Effect of Internally Generated Inner-Core Asymmetries on Tropical Cyclone Potential Intensity
(American Meteorological Society, 2007)In a quiescent environment on an f plane, the internal dynamic processes of a tropical cyclone (TC) can generate axially asymmetric circulations (asymmetries) in its inner-core region. The present study investigates how ... -
Modal and Nonmodal Symmetric Perturbations. Part II: Nonmodal Growths Measured by Total Perturbation Energy
(American Meteorological Society, 2007)Maximum nonmodal growths of total perturbation energy are computed for symmetric perturbations constructed from the normal modes presented in Part I. The results show that the maximum nonmodal growths are larger than the ... -
Targeted Observations of Tropical Cyclone Movement Based on the Adjoint-Derived Sensitivity Steering Vector
(American Meteorological Society, 2007)Since 2003, a field program has been conducted under the name of Dropwindsonde Observations for Typhoon Surveillance near the Taiwan Region (DOTSTAR). As the name DOTSTAR suggests, targeted observation is one of its key ... -
Entrainment-Mixing and Radiative Transfer Simulation in Boundary Layer Clouds
(American Meteorological Society, 2007)In general circulation models, clouds are parameterized and radiative transfer calculations are performed using the plane-parallel approximation over the cloudy fraction of each model grid. The albedo bias resulting from ... -
Dynamics of the Shallow Meridional Circulation around Intertropical Convergence Zones
(American Meteorological Society, 2007)The generally accepted view of the meridional circulation in the tropical east Pacific is that of a single deep overturning cell driven by deep convective heating in the intertropical convergence zone (ITCZ), similar to ... -
The Spectral Ice Habit Prediction System (SHIPS). Part I: Model Description and Simulation of the Vapor Deposition Process
(American Meteorological Society, 2007)This paper describes the Spectral Ice Habit Prediction System (SHIPS), which represents a continuous-property approach to microphysics simulation in an Eulerian cloud-resolving model (CRM). A two-moment hybrid-bin method ... -
Observed Characteristics of the MJO Relative to Maximum Rainfall
(American Meteorological Society, 2007)This study examines various dynamical and thermodynamical processes that characterize the Madden?Julian oscillation (MJO). Episodes of deep convection related to the MJO based on rainfall data from the Tropical Rainfall ... -
Near-Surface Intensification of Tornado Vortices
(American Meteorological Society, 2007)An idealized analytical model and numerical large-eddy simulations are used to explore fluid-dynamic mechanisms by which tornadoes may be intensified near the surface relative to conditions aloft. The analytical model ... -
Maximum Entropy Production in Climate Theory
(American Meteorological Society, 2007)R. D. Lorenz et al. claim that recent data on Mars and Titan show that planetary atmospheres are in unconstrained states of maximum entropy production (MEP). Their model as it applies to Venus, Earth, Mars, and Titan is ... -
Near-Surface Vortex Intensification through Corner Flow Collapse
(American Meteorological Society, 2007)Results are presented from a large set of large-eddy simulations of a class of unsteady vortex evolution that may sometimes play a role in tornadogenesis or tornado variability. Beginning with a high-swirl parent vortex ... -
Katabatic Winds on Ice Sheets: A Refinement of the Prandtl Model
(American Meteorological Society, 2007)Katabatic winds on ice sheets and glaciers are buoyancy-driven flows, much like turbidity currents in the ocean. These winds are driven by radiative cooling of the ice surface and are not resolved by the typical horizontal ... -
Simulating the Seasonal Cycle of the Northern Hemisphere Storm Tracks Using Idealized Nonlinear Storm-Track Models
(American Meteorological Society, 2007)In this study, an idealized nonlinear model is used to investigate whether dry dynamical factors alone are sufficient for explaining the observed seasonal modulation of the Northern Hemisphere storm tracks during the cool ... -
The Effects of a Mountain on the Propagation of a Preexisting Convective System for Blocked and Unblocked Flow Regimes
(American Meteorological Society, 2007)Observations and previous research of squall lines impinging on mountain ranges have revealed that the squall lines sometimes stall upstream of the mountains for several hours leading to copious accumulations of precipitation. ... -
Radar Analysis of Precipitation Initiation in Maritime versus Continental Clouds near the Florida Coast: Inferences Concerning the Role of CCN and Giant Nuclei
(American Meteorological Society, 2007)A method of analyzing radar data is developed and applied to determine whether the X-band radar reflectivity evolution of clouds observed during summertime on the northeast Florida coast during the Small Cumulus Microphysics ... -
The Occurrence of “Irregular” Ice Particles in Stratiform Clouds
(American Meteorological Society, 2007)Recent studies that have classified ice particles from airborne imaging probe data have concluded that the vast majority of ice particles in stratiform precipitation systems are of an ?irregular shape.? This conclusion ...