Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3881-3900 of 13215
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Observations of a Super Cloud Cluster Accompanied by Synoptic-Scale Eastward-Propagating Precipitating Systems over the Indian Ocean
(American Meteorological Society, 2010)The multiscale structure of a super cloud cluster (SCC) over the equatorial Indian Ocean, observed in November and December 2006, was investigated using data from satellite microwave sensors and surface-based radars. The ... -
A Wave Amplitude Transition in a Quasi-Linear Model with Radiative Forcing and Surface Drag
(American Meteorological Society, 2009)A quasi-linear two-layer quasigeostrophic ?-plane model of the interaction between a baroclinic jet and a single zonal wavenumber perturbation is used to study the mechanics leading to a wave amplitude bifurcation?in ... -
Stratospheric Influences on Tropospheric Weather Systems
(American Meteorological Society, 2010)Four cases of tropospheric weather systems (two sea level cyclones, one sea level anticyclone, and one blocking midtropospheric anticyclone) are investigated with the goal of understanding the role of stratospheric versus ... -
Energy Production, Frictional Dissipation, and Maximum Intensity of a Numerically Simulated Tropical Cyclone
(American Meteorological Society, 2010)A tropical cyclone (TC) viewed as a heat engine converts heat energy extracted from the ocean into the kinetic energy of the TC, which is eventually dissipated due to surface friction. Since the energy production rate is ... -
Microwave Backscatter and Extinction by Soft Ice Spheres and Complex Snow Aggregates
(American Meteorological Society, 2010)Coupled-dipole approximation (CDA) calculations of microwave extinction and radar backscatter are presented for nonhomogeneous (soft) ice spheres and for quasi-realistic aggregates of elementary ice crystal forms, including ... -
Wave Driving in the Tropical Lower Stratosphere as Simulated by WACCM. Part II: ENSO-Induced Changes for Northern Winter
(American Meteorological Society, 2010)This study investigates ENSO-induced changes in the tropical lower stratosphere for northern winter as simulated by the Whole Atmosphere Community Climate Model (WACCM). A comparison is made between two 3650-day perpetual ... -
Mechanisms for Spontaneous Gravity Wave Generation within a Dipole Vortex
(American Meteorological Society, 2009)Previous simulations of dipole vortices propagating through rotating, stratified fluid have revealed small-scale inertia?gravity waves that are embedded within the dipole near its leading edge and are approximately stationary ... -
Characteristics of an African Easterly Wave Observed during NAMMA
(American Meteorological Society, 2010)The evolution of an African easterly wave is described using ground-based radar and ancillary datasets from three locations in West Africa: Niamey, Niger (continental), Dakar, Senegal (coastal), and Praia, Republic of Cape ... -
Simulation and Interpretation of the Genesis of Tropical Storm Gert (2005) as Part of the NASA Tropical Cloud Systems and Processes Experiment
(American Meteorological Society, 2009)Several hypotheses have been put forward for the mechanisms of generation of surface circulation associated with tropical cyclones. This paper examines high-resolution simulations of Tropical Storm Gert (2005), which formed ... -
Computational Cost and Accuracy in Calculating Three-Dimensional Radiative Transfer: Results for New Implementations of Monte Carlo and SHDOM
(American Meteorological Society, 2009)This paper examines the tradeoffs between computational cost and accuracy for two new state-of-the-art codes for computing three-dimensional radiative transfer: a community Monte Carlo model and a parallel implementation ... -
LASE Measurements of Water Vapor, Aerosol, and Cloud Distributions in Saharan Air Layers and Tropical Disturbances
(American Meteorological Society, 2009)The Lidar Atmospheric Sensing Experiment (LASE) on board the NASA DC-8 measured high-resolution profiles of water vapor and aerosols, and cloud distributions in 14 flights over the eastern North Atlantic during the NASA ... -
Gravity Waves Generated by Sheared Potential Vorticity Anomalies
(American Meteorological Society, 2010)The gravity waves (GWs) generated by potential vorticity (PV) anomalies in a rotating stratified shear flow are examined under the assumptions of constant vertical shear, two-dimensionality, and unbounded domain. Near a ... -
Dynamics of the Cumulus Cloud Margin: An Observational Study
(American Meteorological Society, 2009)Aircraft observations of shallow to moderately deep cumulus clouds are analyzed with the purpose of describing the typical horizontal structure of thermodynamic and kinematic parameters near the cumulus margin from the ... -
An Analysis of the Effect of Topography on the Martian Hadley Cells
(American Meteorological Society, 2010)Previous work with Mars general circulation models (MGCMs) has shown that the north?south slope in Martian topography causes asymmetries in the Hadley cells at equinox and in the annual average. To quantitatively solve for ... -
Characteristics of Deep Tropical and Subtropical Convection from Nadir-Viewing High-Altitude Airborne Doppler Radar
(American Meteorological Society, 2010)This paper presents observations of deep convection characteristics in the tropics and subtropics that have been classified into four categories: tropical cyclone, oceanic, land, and sea breeze. Vertical velocities in the ... -
The Continuous Spectrum in Baroclinic Models with Uniform Potential Vorticity Gradient and Ekman Damping
(American Meteorological Society, 2009)Analytic solutions of the continuous spectrum are obtained for quasigeostrophic models in which the basic-state meridional potential vorticity (PV) gradient is uniform but nonzero. The modes that form the continuous ... -
Impact of Airborne Doppler Radar Data Assimilation on the Numerical Simulation of Intensity Changes of Hurricane Dennis near a Landfall
(American Meteorological Society, 2009)Accurate forecasting of a hurricane?s intensity changes near its landfall is of great importance in making an effective hurricane warning. This study uses airborne Doppler radar data collected during the NASA Tropical Cloud ... -
Convective-Scale Structure and Evolution during a High-Resolution Simulation of Tropical Cyclone Rapid Intensification
(American Meteorological Society, 2010)The role of convective-scale processes in a 1.67-km mesoscale model simulation of the rapid intensification (RI) of Hurricane Dennis (2005) is presented. The structure and evolution of inner-core precipitating areas during ... -
Comments on “The Effects of Mesoscale Surface Heterogeneity on the Fair-Weather Convective Atmospheric Boundary Layer”
(American Meteorological Society, 2009) -
Atlantic Tropical Cyclogenetic Processes during SOP-3 NAMMA in the GEOS-5 Global Data Assimilation and Forecast System
(American Meteorological Society, 2009)This article investigates the role of the Saharan air layer (SAL) in tropical cyclogenetic processes associated with a nondeveloping and a developing African easterly wave observed during the Special Observation Period ...