Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2981-3000 of 13215
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Potential Vorticity Diagnosis of a Simulated Hurricane. Part II: Quasi-Balanced Contributions to Forced Secondary Circulations
(American Meteorological Society, 2006)Although the forced secondary circulations (FSCs) associated with hurricane-like vortices have been previously examined, understanding is still limited to idealized, axisymmetric flows and forcing functions. In this study, ... -
Nonlocal Treatment of the Buoyancy-Shear-Driven Boundary Layer
(American Meteorological Society, 2006)A successful description of a convective boundary layer requires that the model employed takes into account the nonlocal nature of turbulent convection. In this paper new third-order moments (TOMs) are presented and tested. ... -
Rain Reevaporation, Boundary Layer–Convection Interactions, and Pacific Rainfall Patterns in an AGCM
(American Meteorological Society, 2006)Sensitivity experiments with an atmospheric general circulation model (AGCM) show that parameterized rain reevaporation has a large impact on simulated precipitation patterns in the tropical Pacific, especially on the ... -
Stochastic Models for the Kinematics of Moisture Transport and Condensation in Homogeneous Turbulent Flows
(American Meteorological Society, 2006)The transport of a condensing passive scalar is studied as a prototype model for the kinematics of moisture transport on isentropic surfaces. Condensation occurs whenever the scalar concentration exceeds a specified local ... -
Dynamical Subgrid-Scale Parameterizations from Direct Numerical Simulations
(American Meteorological Society, 2006)Dynamical subgrid-scale parameterizations of stochastic backscatter, eddy drain viscosity, and net eddy viscosity have been formulated and calculated for two-dimensional turbulent flows on the sphere based on the statistics ... -
Generation and Trapping of Gravity Waves from Convection with Comparison to Parameterization
(American Meteorological Society, 2006)Some parameterizations of gravity wave mean flow forcing in global circulation models (GCMs) add realism by describing wave generation by tropospheric convection. Because the convection in GCMs is itself a parameterized ... -
Further Results on Moist Nearly Neutral Flow over a Ridge
(American Meteorological Society, 2006)In a recent study, the authors performed numerical simulations of moist nearly neutral flows over a ridge using the Weather Research and Forecasting (WRF) Model in a regime where the Coriolis force can be neglected and ... -
Relative Humidity in Liquid, Mixed-Phase, and Ice Clouds
(American Meteorological Society, 2006)The results of in situ observations of the relative humidity in liquid, mixed, and ice clouds typically stratiform in nature and associated with mesoscale frontal systems at temperatures ?45°C < Ta < ?5°C are presented. ... -
Cloud Properties Simulated by a Single-Column Model. Part II: Evaluation of Cumulus Detrainment and Ice-Phase Microphysics Using a Cloud-Resolving Model
(American Meteorological Society, 2006)This paper is the second in a series in which kilometer-scale-resolving observations from the Atmospheric Radiation Measurement Program and output from the University of California, Los Angeles/Colorado State University ... -
Gap Flows through Idealized Topography. Part II: Effects of Rotation and Surface Friction
(American Meteorological Society, 2006)Numerical simulations are conducted of geostrophically balanced flow over an isolated mountain cut by a horizontal gap. The relative importance of the along-gap synoptic-scale pressure gradient and terrain-induced mesoscale ... -
Normal-Mode Analysis of a Baroclinic Wave-Mean Oscillation
(American Meteorological Society, 2006)The stability of a time-periodic baroclinic wave-mean oscillation in a high-dimensional two-layer quasigeostrophic spectral model is examined by computing a full set of time-dependent normal modes (Floquet vectors) for the ... -
Vertical Moist Thermodynamic Structure and Spatial–Temporal Evolution of the MJO in AIRS Observations
(American Meteorological Society, 2006)The atmospheric moisture and temperature profiles from the Atmospheric Infrared Sounder (AIRS)/Advanced Microwave Sounding Unit on the NASA Aqua mission, in combination with the precipitation from the Tropical Rainfall ... -
The Madden–Julian Oscillation Recorded in Early Observations from the Tropical Rainfall Measuring Mission (TRMM)
(American Meteorological Society, 2006)A satellite data analysis is performed to explore the Madden?Julian oscillation (MJO) focusing on the potential roles of the equatorial Rossby (ER) and Kelvin waves. Measurements from the Tropical Rainfall Measuring Mission ... -
Melting Layer Cloud Observed during R/V Mirai Cruise MR01-K05
(American Meteorological Society, 2006)In this study, cloud profiling radar and lidar were used to determine the frequency distribution of the base heights of cloudy layers with little (or no) falling condensate particles. The data were obtained from stationary ... -
Low-Frequency Variability in the Midlatitude Baroclinic Atmosphere Induced by an Oceanic Thermal Front
(American Meteorological Society, 2007)This study examines the flow induced by an east?west-oriented oceanic thermal front in a highly idealized baroclinic model. Previous work showed that thermal fronts could produce energetic midlatitude jets in an ... -
What Is the Shape of a Raindrop? An Answer from Radar Measurements
(American Meteorological Society, 2006)In a previous study, Gorgucci et al. showed the potential advantage of using together polarimetric radar measurements of reflectivity factor, differential reflectivity, and specific differential propagation phase, in order ... -
Field Observations of Multimode Raindrop Oscillations by High-Speed Imaging
(American Meteorological Society, 2006)Periodic oscillations of raindrops falling at terminal velocity in natural rain are visualized for the first time by high-speed imaging. These images show the existence of an oscillation mode with the same frequency as the ... -
A Bootstrap Technique for Testing the Relationship between Local-Scale Radar Observations of Cloud Occurrence and Large-Scale Atmospheric Fields
(American Meteorological Society, 2006)A classification scheme is created to map the synoptic-scale (large scale) atmospheric state to distributions of local-scale cloud properties. This mapping is accomplished by a neural network that classifies 17 months of ... -
On the Tropospheric Response to Anomalous Stratospheric Wave Drag and Radiative Heating
(American Meteorological Society, 2006)Observational and numerical evidence suggest that variability in the extratropical stratospheric circulation has a demonstrable impact on tropospheric variability on intraseasonal time scales. In this study, it is demonstrated ... -
Turbulent Velocity-Variance Profiles in the Stable Boundary Layer Generated by a Nocturnal Low-Level Jet
(American Meteorological Society, 2006)Profiles of mean winds and turbulence were measured by the High Resolution Doppler lidar in the strong-wind stable boundary layer (SBL) with continuous turbulence. The turbulence quantity measured was the variance of the ...