Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1961-1980 of 13215
-
CCN and Vertical Velocity Influences on Droplet Concentrations and Supersaturations in Clean and Polluted Stratus Clouds
(American Meteorological Society, 2013)loud microphysics and cloud condensation nuclei (CCN) measurements from two marine stratus cloud projects are presented and analyzed. Results show that the increase of cloud droplet concentrations Nc with CCN concentrations ... -
Daytime Heat Transfer Processes over Mountainous Terrain
(American Meteorological Society, 2013)he daytime heat transfer mechanisms over mountainous terrain are investigated by means of large-eddy simulations over idealized valleys. Two- and three-dimensional topographies, corresponding to infinite and finite valleys, ... -
The Contribution of Extratropical Waves to the MJO Wind Field
(American Meteorological Society, 2013)method for capturing the different dynamical components of the Madden?Julian oscillation (MJO) is presented. The tropical wind field is partitioned into three components using free-space Green?s functions: 1) a nondivergent ... -
Mesoscale Energy Spectra of the Mei-Yu Front System. Part I: Kinetic Energy Spectra
(American Meteorological Society, 2013)he mesoscale kinetic energy (KE) spectra of the mei-yu front system are investigated through idealized numerical simulations. In the mature stage, the upper-tropospheric KE spectrum resembles a ?3 power law for wavelengths ... -
Physical Mechanisms of Tropopause Polar Vortex Intensity Change
(American Meteorological Society, 2013)haracterized by radii as large as 800 km and lifetimes up to months, cyclonic tropopause polar vortices (TPVs) are coherent circulation features over the Arctic that are important precursors for surface cyclogenesis in ... -
ENSO Impact on Kelvin Waves and Associated Tropical Convection
(American Meteorological Society, 2013)he impact of El Niño?Southern Oscillation (ENSO) on atmospheric Kelvin waves and associated tropical convection is investigated using the ECMWF Re-Analysis, NOAA outgoing longwave radiation (OLR), and the analysis technique ... -
Emergence and Equilibration of Jets in Beta-Plane Turbulence: Applications of Stochastic Structural Stability Theory
(American Meteorological Society, 2013)tochastic structural stability theory (S3T) provides analytical methods for understanding the emergence and equilibration of jets from the turbulence in planetary atmospheres based on the dynamics of the statistical mean ... -
Predictability of Major Stratospheric Sudden Warmings of the Vortex Split Type: Case Study of the 2002 Southern Event and the 2009 and 1989 Northern Events
(American Meteorological Society, 2014)his study investigates the predictability of three major stratospheric sudden warmings (MSSWs) of the vortex split type: the Southern Hemisphere case in September 2002 and two Northern Hemisphere cases in January 2009 and ... -
Structure, Energy, and Parameterization of Inertia–Gravity Waves in Dry and Moist Simulations of a Baroclinic Wave Life Cycle
(American Meteorological Society, 2014)he impact of moisture on inertia?gravity wave generation is assessed for an idealized unstable baroclinic wave using the Weather Research and Forecasting Model (WRF) in a channel on the f plane. The evolution of these waves ... -
Formation of the Enhanced-V Infrared Cloud-Top Feature from High-Resolution Three-Dimensional Radar Observations
(American Meteorological Society, 2013)he responsible mechanism for the formation of the enhanced-V infrared cloud-top feature observed above tropopause-penetrating thunderstorms is not well understood. A new method for the combination of volumetric radar ... -
Tornadogenesis in a High-Resolution Simulation of the 8 May 2003 Oklahoma City Supercell
(American Meteorological Society, 2013)50-m-grid-spacing Advanced Regional Prediction System (ARPS) simulation of the 8 May 2003 Oklahoma City tornadic supercell is examined. A 40-min forecast run on the 50-m grid produces two F3-intensity tornadoes that track ... -
Sensitivity of the Position and Variability of the Eddy-Driven Jet to Different SST Profiles in an Aquaplanet General Circulation Model
(American Meteorological Society, 2013)he response of the storm track and eddy-driven jet to various steady sea surface temperature (SST) forcings is analyzed using the aquaplanet configuration of the atmospheric general circulation model Action de Recherche ... -
Comparing the Roles of Barotropic versus Baroclinic Feedbacks in the Atmosphere’s Response to Mechanical Forcing
(American Meteorological Society, 2013)o barotropic or baroclinic eddy feedbacks dominate the atmospheric circulation response to mechanical forcing?To address this question, barotropic torques are imposed over a range of latitudes in both an idealized general ... -
Topological Entropy: A Lagrangian Measure of the State of the Free Atmosphere
(American Meteorological Society, 2013)opological entropy is shown to be a useful characteristic of the state of the free atmosphere. It can be determined as the stretching rate of a line segment of tracer particles in the atmosphere over a time span of about ... -
Toward an Understanding of Vertical Momentum Transports in Cloud-System-Resolving Model Simulations of Multiscale Tropical Convection
(American Meteorological Society, 2013)his study examines the characteristics of convective momentum transport (CMT) and gravity wave momentum transport (GWMT) in two-dimensional cloud-system-resolving model simulations, including the relationships between the ... -
Improving Antarctic Total Ozone Projections by a Process-Oriented Multiple Diagnostic Ensemble Regression
(American Meteorological Society, 2013)ccurate projections of stratospheric ozone are required because ozone changes affect exposure to ultraviolet radiation and tropospheric climate. Unweighted multimodel ensemble-mean (uMMM) projections from chemistry?climate ... -
Rayleigh Damping in the Free Troposphere
(American Meteorological Society, 2013)his paper explores whether cumulus drag (i.e., the damping of winds by convective momentum transport) can be described by an effective Rayleigh drag (i.e., the damping of winds on a constant time scale). Analytical expressions ... -
Upscale Effects of Deep Convection during the North American Monsoon
(American Meteorological Society, 2013)he ability of deep monsoon convection to influence the larger-scale circulation over North America is investigated for a 6-day-long case study during the 2006 North American monsoon. Results from Rossby wave ray tracing ... -
Structure and Properties of Madden–Julian Oscillations Deduced from DYNAMO Sounding Arrays
(American Meteorological Society, 2013)he kinematic and thermodynamic characteristics of the October and November 2011 Madden?Julian oscillations (MJOs) that occurred over the Indian Ocean during Dynamics of the MJO (DYNAMO) are investigated. Analyses are ... -
Influence of Stratospheric Sudden Warming on AIRS Midtropospheric CO2
(American Meteorological Society, 2013)idtropospheric CO2 retrievals from the Atmospheric Infrared Sounder (AIRS) were used to explore the influence of stratospheric sudden warming (SSW) on CO2 in the middle to upper troposphere. To choose the SSW events that ...