Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3261-3280 of 13215
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Comments on “‘A Theory for Strong Long-Lived Squall Lines’ Revisited”
(American Meteorological Society, 2005) -
On the Role of Moist Processes in Tropical Intraseasonal Variability: Cloud–Radiation and Moisture–Convection Feedbacks
(American Meteorological Society, 2005)Recent observations of the tropical atmosphere reveal large variations of water vapor and clouds at intraseasonal time scales. This study investigates the role of these variations in the large-scale organization of the ... -
Tracer Transport in Deep Convective Updrafts: Plume Ensemble versus Bulk Formulations
(American Meteorological Society, 2005)Two widely used approaches for parameterizing tracer transport based on convective mass fluxes are the plume ensemble formulation (PEF) and the bulk formulation (BF). Here the behavior of these two is contrasted for the ... -
Assimilation of Surface Pressure Observations Using an Ensemble Filter in an Idealized Global Atmospheric Prediction System
(American Meteorological Society, 2005)An ensemble filter data assimilation system is tested in a perfect model setting using a low resolution Held?Suarez configuration of an atmospheric GCM. The assimilation system is able to reconstruct details of the model?s ... -
Using Idealized Coherent Structures to Parameterize Momentum Fluxes in a PBL Mass-Flux Model
(American Meteorological Society, 2005)In 2001, the authors presented a higher-order mass-flux model called assumed distributions with higher-order closure (ADHOC), which represents the large eddies of the planetary boundary layer (PBL) in terms of an assumed ... -
An Observational Case for the Prevalence of Roll Vortices in the Hurricane Boundary Layer
(American Meteorological Society, 2005)Doppler velocity data from Weather Surveillance Radar-1988 Doppler (WSR-88D) radars during four hurricane landfalls are analyzed to investigate the presence of organized vortices in the hurricane boundary layer (HBL). The ... -
Predictability in a Model of Geophysical Turbulence
(American Meteorological Society, 2005)The nature of predictability is examined in a numerical model relevant to the midlatitude atmosphere and oceans. The approach followed is novel and uses new theoretical tools from information theory, namely entropy ... -
The Dynamics of Phase Locking
(American Meteorological Society, 2005)Many low-frequency phenomena such as the Madden?Julian oscillation (MJO) or the El Niño?Southern Oscillation (ENSO) exhibit rapid growth where they appear to be undergoing a phase locking with other time scales such as the ... -
Embedded Cellular Convection in Moist Flow past Topography
(American Meteorological Society, 2005)Marginally unstable air masses impinging upon a mountain ridge may lead to the development of a nominally stratiform orographic cloud with shallow embedded convection. Rainfall amounts and distribution are then strongly ... -
A Conceptual Model for Entrainment in Cumulus Clouds
(American Meteorological Society, 2005)Cumulus clouds are generally modeled as a plume, and the model works well up until the cloud base is encountered, beyond which the continuously entraining model does not appear appropriate. Although it has been known for ... -
A Study of the Global Structure of the Migrating Diurnal Tide Using Generalized Hough Modes
(American Meteorological Society, 2005)The theory of generalized Hough modes developed in a companion paper is applied here to investigate the structure of the migrating diurnal tide in the mesosphere and lower thermosphere. A series of simple examples illustrate ... -
Generalized Hough Modes: The Structure of Damped Global-Scale Waves Propagating on a Mean Flow with Horizontal and Vertical Shear
(American Meteorological Society, 2005)The technique of classical tidal theory in which linear disturbances to a background flow at rest are expanded in terms of Hough modes is generalized for damped disturbances to a general zonal mean state under the assumption ... -
Perturbation Growth in Baroclinic Waves
(American Meteorological Society, 2005)Floquet theory is applied to the stability of time-periodic, nonparallel shear flows consisting of a baroclinic jet plus a neutral wave. This configuration is chosen as an idealized representation of baroclinic waves in a ... -
Regional Heat Sources and the Active and Break Phases of Boreal Summer Intraseasonal (30–50 Day) Variability
(American Meteorological Society, 2005)The boreal summer intraseasonal variability (BSISV) associated with the 30?50-day mode is represented by the coexistence of three components: poleward propagation of convection over the Indian and tropical west Pacific ... -
Adjustment to Injections of Mass, Momentum, and Heat in a Compressible Atmosphere
(American Meteorological Society, 2005)This study compares the response to injections of mass, heat, and momentum during hydrostatic and geostrophic adjustment in a compressible atmosphere. The sensitivity of the adjustment to these different injection types ... -
An Assessment of the Parameterization of Subgrid-Scale Cloud Effects on Radiative Transfer. Part II: Horizontal Inhomogeneity
(American Meteorological Society, 2005)The role of horizontal inhomogeneity in radiative transfer through cloud fields is investigated within the context of the two-stream approximation. Spatial correlations between cloud optical properties and the radiance ... -
Evolution of a Florida Cirrus Anvil
(American Meteorological Society, 2005)This paper presents a detailed study of a single thunderstorm anvil cirrus cloud measured on 21 July 2002 near southern Florida during the Cirrus Regional Study of Tropical Anvils and Cirrus Layers?Florida Area Cirrus ... -
A Simulation of a Supercell Thunderstorm with Emulated Radiative Cooling beneath the Anvil
(American Meteorological Society, 2005)This note reports the preliminary results of an ongoing numerical study designed to investigate what effects, if any, radiative transfer processes can have on the evolution of convective storms. A pair of idealized ... -
A Topographic Drag Closure Built on an Analytical Base Flux
(American Meteorological Society, 2005)Topographic drag schemes depend on grid-scale representations of the average height, width, and orientation of the subgrid topography. Until now, these representations have been based on a combination of statistics and ... -
The Role of Wave Packets in Wave–Mean Flow Interactions during Southern Hemisphere Summer
(American Meteorological Society, 2005)In this study, reanalysis data produced by the European Centre for Medium-Range Weather Forecasts for 14 Southern Hemisphere (SH) summer seasons have been analyzed. All cases of hemispheric transient eddy kinetic energy ...