Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3701-3720 of 13215
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Comparisons of CCN with Supercooled Clouds
(American Meteorological Society, 2010)More than 140 supercooled clouds were compared with corresponding out-of-cloud cloud condensation nuclei (CCN) measurements. In spite of significant differences in altitude, temperature, distances from cloud base, updraft ... -
Finite-Amplitude Wave Activity and Diffusive Flux of Potential Vorticity in Eddy–Mean Flow Interaction
(American Meteorological Society, 2010)An exact diagnostic formalism for finite-amplitude eddy?mean flow interaction is developed for barotropic and quasigeostrophic baroclinic flows on the beta plane. Based on the advection?diffusion?reaction equation for ... -
Dynamical Mechanism for the Increase in Tropical Upwelling in the Lowermost Tropical Stratosphere during Warm ENSO Events
(American Meteorological Society, 2010)The Brewer?Dobson circulation strengthens in the lowermost tropical stratosphere during warm El Niño?Southern Oscillation (ENSO) events. Dynamical analyses using the most recent version of the Whole Atmosphere Community ... -
The Polar Summer Tropopause Inversion Layer
(American Meteorological Society, 2010)Temperature profiles in polar latitudes during summer reveal a strong and persistent inversion layer associated with the polar summer tropopause. This inversion layer is characterized by a temperature increase of ?8 K in ... -
Effect of Tropical Waves on the Tropical Tropopause Transition Layer Upwelling
(American Meteorological Society, 2010)An initial-value problem is employed with a GCM to investigate the role of the convectively driven Rossby and Kelvin waves for tropopause transition layer (TTL) upwelling in the tropics. The convective heating is mimicked ... -
Genesis of Pre–Hurricane Felix (2007). Part II: Warm Core Formation, Precipitation Evolution, and Predictability
(American Meteorological Society, 2010)This is the second of a two-part study examining the simulated formation of Atlantic Hurricane Felix (2007) in a cloud-representing framework. Here several open issues are addressed concerning the formation of the storm?s ... -
Wavelet Analyses of Turbulence in the Hurricane Surface Layer during Landfalls
(American Meteorological Society, 2010)Using wavelet transform (WT), this study analyzes the surface wind data collected by the portable wind towers during the landfalls of six hurricanes and one tropical storm in the 2002?04 seasons. The WT, which decomposes ... -
A Classical-Theory-Based Parameterization of Heterogeneous Ice Nucleation by Mineral Dust, Soot, and Biological Particles in a Global Climate Model
(American Meteorological Society, 2010)An ice nucleation parameterization based on classical nucleation theory, with aerosol-specific parameters derived from experiments, has been implemented into a global climate model?the Community Atmosphere Model (CAM)-Oslo. ... -
Daytime Heat Transfer Processes Related to Slope Flows and Turbulent Convection in an Idealized Mountain Valley
(American Meteorological Society, 2010)The mechanisms governing the daytime development of thermally driven circulations along the transverse axis of idealized two-dimensional valleys are investigated by means of large-eddy simulations. In particular, the impact ... -
The Detection and Significance of Diurnal Pressure and Potential Vorticity Anomalies East of the Rockies
(American Meteorological Society, 2010)Harmonic analysis of pressure, temperature, and precipitation data from 1000 Automated Surface Observing System (ASOS) stations reveals a mix of stationary and east?west moving disturbances east of the Rockies. Optimization ... -
Employing Cluster Analysis to Detect Significant Cloud 3D RT Effect Indicators
(American Meteorological Society, 2010)Three-dimensional cloud field morphology contributes to scene-averaged cloud reflectivity, but climate models do not currently incorporate methods of identifying situations where this contribution is substantial. This work ... -
The Three-Dimensional Axisymmetric Wind Field Structure of the Spencer, South Dakota, 1998 Tornado
(American Meteorological Society, 2010)The three-dimensional axisymmetric wind field structure of the violent Spencer, South Dakota, 1998 tornado was analyzed using the ground-based velocity track display (GBVTD) method. Data from a Doppler on Wheels mobile ... -
A Piecewise Potential Vorticity Inversion Algorithm and Its Application to Hurricane Inner-Core Anomalies
(American Meteorological Society, 2010)In this study, a piecewise potential vorticity (PV) inversion algorithm for an arbitrary number of PV pieces is developed by extending Wang and Zhang?s PV inversion scheme, and then the nonlinear responses to various types ... -
Idealized Simulations of the Intertropical Convergence Zone and Its Multilevel Flows
(American Meteorological Society, 2010)A mesoscale numerical model with an idealized tropical channel environment is used to study the dynamics of intertropical convergence zones (ITCZs) and the recently identified shallow return flow (SRF) and midlevel inflow ... -
Characterization of Momentum Transport Associated with Organized Moist Convection and Gravity Waves
(American Meteorological Society, 2010)Tropical convection is inherently multiscalar, involving complex fields of clouds and various regimes of convective organization ranging from small disorganized cumulus up to large organized convective clusters. In addition ... -
Baroclinic Waves with Parameterized Effects of Moisture Interpreted Using Rossby Wave Components
(American Meteorological Society, 2010)A theoretical framework is developed for the evolution of baroclinic waves with latent heat release parameterized in terms of vertical velocity. Both wave?conditional instability of the second kind (CISK) and large-scale ... -
Simulations of Subtropical Cyclones in a Baroclinic Channel Model
(American Meteorological Society, 2010)The present study considers a variety of cyclone developments that occur in an idealized, baroclinic channel model featuring full condensation heating effects over an ocean with prescribed sea surface temperature variation. ... -
Analysis of Tools Used to Quantify Droplet Clustering in Clouds
(American Meteorological Society, 2010)The spacing of cloud droplets observed along an approximately horizontal line through a cloud may be analyzed using a variety of techniques to reveal structure on small scales, sometimes called clustering, if such structure ... -
Annual, Interannual, and Intraseasonal Variability of Tropical Tropopause Transition Layer Cirrus
(American Meteorological Society, 2010)Cloud fields based on the first three years of data from the Cloud?Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) mission are used to investigate the relationship between cirrus within the tropical ... -
Tropical Tropopause Transition Layer Cirrus as Represented by CALIPSO Lidar Observations
(American Meteorological Society, 2010)The spatial and temporal variability of cirrus cloud fraction within the tropical tropopause transition layer (TTL) is investigated based on three years of data from the Cloud?Aerosol Lidar and Infrared Pathfinder Satellite ...