Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2081-2100 of 13215
-
An Expanded Dataset of Hurricane Eyewall Sizes and Slopes
(American Meteorological Society, 2014)sing airborne Doppler radar data from 39 flights into hurricanes from 2004 to 2010, the authors examine the outward slope of the eyewall, revisiting the recent studies of Stern and Nolan. The slope of the radius of maximum ... -
Frictional Convergence in a Decaying Weak Vortex
(American Meteorological Society, 2014)ross-isobaric flow and Ekman pumping are investigated in the frictional spindown of an initially barotropic vortex in a stratified atmosphere. Consistent with early work by Holton and others, it is found that the stratification ... -
Numerical Simulations of Sheared Conditionally Unstable Flows over a Mountain Ridge
(American Meteorological Society, 2014)n two recent papers, the authors performed numerical simulations with a three-dimensional, explicitly cloud-resolving model for a uniform wind flowing past a bell-shaped ridge and using an idealized unstable (Weisman?Klemp) ... -
Quadrant Distribution of Tropical Cyclone Inner-Core Kinematics in Relation to Environmental Shear
(American Meteorological Society, 2014)irborne Doppler radar data collected in tropical cyclones by National Oceanic and Atmospheric Administration WP-3D aircraft over an 8-yr period (2003?10) are used to statistically analyze the vertical structure of tropical ... -
Large-Scale Distinctions between MJO and Non-MJO Convective Initiation over the Tropical Indian Ocean
(American Meteorological Society, 2013)n this study, the authors seek large-scale signals that may distinguish MJO from non-MJO convective events before they start over the Indian Ocean. Three such signals were found. Low-level easterly anomalies extend from ... -
The Role of Stratospheric Polar Vortex Breakdown in Southern Hemisphere Climate Trends
(American Meteorological Society, 2014)his paper investigates the connection between the delay in the final breakdown of the stratospheric polar vortex, the stratospheric final warming (SFW), and Southern Hemisphere climate trends. The authors first analyze ... -
Lagrangian Mixing Dynamics at the Cloudy–Clear Air Interface
(American Meteorological Society, 2014)he entrainment of clear air and its subsequent mixing with a filament of cloudy air, as occurs at the edge of a cloud, is studied in three-dimensional direct numerical simulations that combine the Eulerian description of ... -
Predictability and Genesis of Hurricane Karl (2010) Examined through the EnKF Assimilation of Field Observations Collected during PREDICT
(American Meteorological Society, 2013)he genesis of Hurricane Karl (2010) is explored using analyses and forecasts from a cycling ensemble Kalman filter (EnKF) that assimilates routinely collected observations as well as dropsonde measurements that were taken ... -
Diabatic Damping of Zonal Index Variations
(American Meteorological Society, 2014)onal index variations, or north?south shifts of the midlatitude jet, are the dominant mode of zonal wind variability in the Southern Hemisphere. Previous studies have shown that synoptic-time-scale eddy momentum flux ... -
Stratospheric Predictability: Basic Characteristics in JMA 1-Month Hindcast Experiments for 1979–2009
(American Meteorological Society, 2014)his study investigates basic characteristics of stratospheric predictability in the Northern Hemisphere using 1-month hindcast (HC) experiment data from the Japan Meteorological Agency for 1979?2009. The author describes ... -
Boundary Layer Updrafts Driven by Airflow over Heated Terrain
(American Meteorological Society, 2013)his study presents linear and nonlinear scalings for boundary layer ascent forced by airflow over heated terrain and compares them to results from corresponding high-resolution numerical simulations. Close agreement between ... -
Regression Analysis of Zonally Narrow Components of the MJO
(American Meteorological Society, 2014)ecent works have demonstrated that eastward-propagating features smaller than zonal wavenumber 3 but with spatial structures similar to those of the Madden?Julian oscillation (MJO) frequently develop over the Indo-Pacific ... -
Comments on “How Does the Boundary Layer Contribute to Eyewall Replacement Cycles in Axisymmetric Tropical Cyclones?”
(American Meteorological Society, 2014) -
Future Changes in the Brewer–Dobson Circulation under Different Greenhouse Gas Concentrations in WACCM4
(American Meteorological Society, 2014)he climatology and future changes of the Brewer?Dobson circulation (BDC) in three climate change scenarios are studied using the latest version of the Whole Atmosphere Community Climate Model (WACCM4), which is fully coupled ... -
An Eigenfrequency Analysis of Mixed Rossby–Gravity Waves on Barotropic Vortices
(American Meteorological Society, 2014)n this study, the linearized, f-plane, shallow-water equations are discretized into a matrix eigenvalue problem to examine the full spectrum of free waves on barotropic (monopolar and hollow) vortices. A typical wave ... -
Performance of a New Convective Parameterization Scheme on Model Convergence in Simulations of a Tropical Cyclone at Grey-Zone Resolutions
(American Meteorological Society, 2014)he latest version of the Weather Research and Forecasting model (WRFV3.5) is used to evaluate the performance of the Grell and Freitas (GF13) cumulus parameterization scheme on the model convergence in simulations of a ... -
Ekman Pumping and the Energetics of the Southern Hemisphere Eddy Life Cycle
(American Meteorological Society, 2014)n the framework of the Lorenz energy cycle, the climatological and eddy life cycle characteristics of the generation of eddy available potential energy through Ekman pumping (EEPE) are evaluated using Interim European ... -
Reply to “Comments on ‘Indications of Stratified Turbulence in a Mechanistic GCM’”
(American Meteorological Society, 2013) -
Reply to “Comments on ‘Direct Numerical Simulation of the Turbulent Ekman Layer: Evaluation of Closure Models’”
(American Meteorological Society, 2014) -
Observations of Temperature in the Upper Troposphere and Lower Stratosphere of Tropical Weather Disturbances
(American Meteorological Society, 2014)icrowave temperature profiler (MTP) data are analyzed to document temperature signatures in the upper troposphere and lower stratosphere that accompany Atlantic tropical weather disturbances. The MTP was deployed on the ...