Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2321-2340 of 13215
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Influence of Convective Momentum Transport on Mixed Rossby–Gravity Waves: A Contribution to Tropical 2-Day Waves
(American Meteorological Society, 2013)nfluences of convective momentum transport (CMT) on tropical waves are analytically studied with an idealized model, which captures the first-order baroclinic structure in the vertical. The CMT has significant influence ... -
Large-Eddy Simulations of Trade Wind Cumuli Using Particle-Based Microphysics with Monte Carlo Coalescence
(American Meteorological Society, 2013)series of simulations employing the superdroplet method (SDM) for representing aerosol, cloud, and rain microphysics in large-eddy simulations (LES) is discussed. The particle-based formulation treats all particles in the ... -
Observed Structure of Convectively Coupled Waves as a Function of Equivalent Depth: Kelvin Waves and the Madden–Julian Oscillation
(American Meteorological Society, 2012)he view that convectively coupled Kelvin waves and the Madden?Julian oscillation (MJO) are distinct modes is tested by regressing data from the Climate Forecast System Reanalysis against satellite outgoing longwave radiation ... -
Dynamical Control of the Mesosphere by Orographic and Nonorographic Gravity Wave Drag during the Extended Northern Winters of 2006 and 2009
(American Meteorological Society, 2012)version of the Canadian Middle Atmosphere Model (CMAM) that is nudged toward reanalysis data up to 1 hPa is used to examine the impacts of parameterized orographic and nonorographic gravity wave drag (OGWD and NGWD) on the ... -
Sensitivities and Mechanisms of the Zonal Mean Atmospheric Circulation Response to Tropical Warming
(American Meteorological Society, 2013)lthough El Niño and global warming are both characterized by warming in the tropical upper troposphere, the latitudinal changes of the Hadley cell edge and midlatitude eddy-driven jet are opposite in sign. Using an idealized ... -
Comments on “Convectively Generated Potential Vorticity in Rainbands and Formation of the Secondary Eyewall in Hurricane Rita of 2005”
(American Meteorological Society, 2012)n a previous paper Judt and Chen propose that secondary eyewall formation can be the result of the accumulation of convectively generated potential vorticity in the rainbands. They argue that secondary potential vorticity ... -
Predictability of Precipitation from Continental Radar Images. Part V: Growth and Decay
(American Meteorological Society, 2012)n a Lagrangian frame of reference, the accuracy of rainfall systems predicted by nowcasting algorithms can be improved by incorporating the growth and decay of the rainfall. The scale dependence of predictability of growth ... -
Dynamical and Physical Processes Leading to Tropical Cyclone Intensification under Upper-Level Trough Forcing
(American Meteorological Society, 2013)he rapid intensification of Tropical Cyclone (TC) Dora (2007, southwest Indian Ocean) under upper-level trough forcing is investigated. TC?trough interaction is simulated using a limited-area operational numerical weather ... -
Analysis of Resolved and Parameterized Vertical Transports in Convective Boundary Layers at Gray-Zone Resolutions
(American Meteorological Society, 2013)he gray zone of a physical process in numerical models is defined as the range of model resolution in which the process is partly resolved by model dynamics and partly parameterized. In this study, the authors examine the ... -
Radiative Impacts of Free-Tropospheric Clouds on the Properties of Marine Stratocumulus
(American Meteorological Society, 2013)bservations from multiple satellites and large-eddy simulations (LESs) from the Regional Atmospheric Modeling System (RAMS) are used to determine the extent to which free-tropospheric clouds (FTCs) affect the properties ... -
Dynamics of Tropical Cyclone Intensification: Deep Convective Cyclonic “Left Movers”
(American Meteorological Society, 2013)eep convective processes play an important role in tropical cyclone (TC) formation and intensification. In this study, the authors investigate the interaction between discrete buoyant updrafts and the vertically sheared ... -
Snow Studies. Part III: Theoretical Derivations for the Ensemble Retrieval of Snow Microphysics from Dual-Wavelength Vertically Pointing Radars
(American Meteorological Society, 2013)s a first step toward retrieval of snow microphysics from two vertically pointing radars operating at X band and W band, a theoretical model of snow microphysics is formulated in which the number of unknown parameters is ... -
Theory and Observations of Controls on Lightning Flash Size Spectra
(American Meteorological Society, 2013)revious analyses of very high frequency (VHF) Lightning Mapping Array (LMA) observations relative to the location of deep convective updrafts have noted a systematic pattern in flash characteristics. In and near strong ... -
Snow Studies. Part IV: Ensemble Retrieval of Snow Microphysics from Dual-Wavelength Vertically Pointing Radars
(American Meteorological Society, 2013)ased on the theory developed in Part III, this paper introduces a new method to retrieve snow microphysics from ground-based collocated X- and W-band vertically pointing Doppler radars. To take into account the variety of ... -
Modulation of Seasonal Precipitation over the Tropical Western/Central Pacific by Convectively Coupled Mixed Rossby–Gravity Waves
(American Meteorological Society, 2012)he relationship between the interannual variations of the activity of convectively coupled equatorial waves and seasonal mean precipitation in the tropical western to central Pacific Ocean is investigated. It is found that ... -
A New Formulation of the Spectral Energy Budget of the Atmosphere, with Application to Two High-Resolution General Circulation Models
(American Meteorological Society, 2013)new formulation of the spectral energy budget of kinetic and available potential energies of the atmosphere is derived, with spherical harmonics as base functions. Compared to previous formulations, there are three main ... -
Thermodynamic Environments of Deep Convection in Atlantic Tropical Disturbances
(American Meteorological Society, 2013)onditional composites of dropsondes deployed into eight tropical Atlantic weather systems during 2010 are analyzed. The samples are conditioned based on cloud-top temperature within 10 km of the dropsonde, the radius from ... -
Changes in the Metastability of the Midlatitude Southern Hemisphere Circulation and the Utility of Nonstationary Cluster Analysis and Split-Flow Blocking Indices as Diagnostic Tools
(American Meteorological Society, 2012)hanges in the metastability of the Southern Hemisphere 500-hPa circulation are examined using both cluster analysis techniques and split-flow blocking indices. The cluster methodology is a purely data-driven approach for ... -
A Multiscale Model for the Planetary and Synoptic Motions in the Atmosphere
(American Meteorological Society, 2013)reduced asymptotic model valid for the planetary and synoptic scales in the atmosphere is presented. The model is derived by applying a systematic multiple-scales asymptotic method to the full compressible-flow equations ... -
Isentropic Transport within the Antarctic Polar-Night Vortex: Rossby Wave Breaking Evidence and Lagrangian Structures
(American Meteorological Society, 2013)he trajectories in the lower stratosphere of isopycnic balloons released from Antarctica by Vorcore and Concordiasi field campaigns during the southern springs of 2005 and 2010 showed events of latitudinal transport inside ...