Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2921-2940 of 13215
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Superrotation Maintained by Meridional Circulation and Waves in a Venus-Like AGCM
(American Meteorological Society, 2006)Fully developed superrotation?60 times faster than the planetary rotation (243 days)?is simulated using a Venus-like atmospheric general circulation model (AGCM). The angular momentum of the superrotation is pumped up by ... -
Information Flow in Ensemble Weather Predictions
(American Meteorological Society, 2007)In a weather prediction, information flows from the initial conditions to a later prediction. The uncertainty in the initial conditions implies that such a flow should be quantified with tools from probability theory. Using ... -
Coastal Wind Jets Flowing into the Tsushima Strait and Their Effect on Wind-Wave Development
(American Meteorological Society, 2007)Coastal wind jets that flow into the Tsushima Strait, Japan, and their effects on wind waves are investigated using synthetic aperture radar (SAR) images and altimeter-derived wind and waves. The coastal wind jets appear ... -
Characteristics of the Atlantic Storm-Track Eddy Activity and Its Relation with the North Atlantic Oscillation
(American Meteorological Society, 2007)This study focuses on feedbacks of the high-frequency eddy activity onto the quasi-stationary circulation, particularly with regard to the North Atlantic Oscillation (NAO). The methodology consists of analyzing NCEP?NCAR ... -
Evolution, Structure, Cloud Microphysical, and Surface Rainfall Processes of Monsoon Convection during the South China Sea Monsoon Experiment
(American Meteorological Society, 2007)A two-dimensional cloud-resolving simulation is combined with dual-Doppler and polarimetric radar analysis to study the evolution, dynamic structure, cloud microphysics, and rainfall processes of monsoon convection observed ... -
A Study of the Energetics of African Easterly Waves Using a Regional Climate Model
(American Meteorological Society, 2007)The evolution and spatial distribution of the energetics of African waves are studied. Complete eddy energy equations for an open system are derived for the computation of energy transformations during wave generation and ... -
Simulated Convective Lines with Parallel Stratiform Precipitation. Part I: An Archetype for Convection in Along-Line Shear
(American Meteorological Society, 2007)This article, the first of two describing convective lines with parallel stratiform (PS) precipitation, addresses the basic kinematic and precipitation features of these systems. The PS mode appears to be the preferred ... -
On Boundary Layer Separation in the Lee of Mesoscale Topography
(American Meteorological Society, 2007)The onset of boundary layer separation (BLS) forced by gravity waves in the lee of mesoscale topography is investigated based on a series of numerical simulations and analytical formulations. It is demonstrated that BLS ... -
Waves in a Cloudy Vortex
(American Meteorological Society, 2007)This paper derives a system of equations that approximately govern small-amplitude perturbations in a nonprecipitating cloudy vortex. The cloud coverage can be partial or complete. The model is used to examine moist vortex ... -
Mechanisms of the Great Plains Low-Level Jet as Simulated in an AGCM
(American Meteorological Society, 2007)A model diagnosis has been performed on the nocturnal Great Plains low-level jet (LLJ), which is one of the key elements of the warm season regional climate over North America. The horizontal?vertical structure, diurnal ... -
Closures for Ensemble-Mean Linear Dynamics with Stochastic Basic Flows
(American Meteorological Society, 2007)This paper demonstrates the validity of a second-order closure for the ensemble-mean dynamics using the approach of direct numerical ensemble simulations of a linear barotropic model with stochastic basic flows. For various ... -
Cloud Activating Properties of Aerosol Observed during CELTIC
(American Meteorological Society, 2007)Measurements of aerosol size distribution, chemical composition, and cloud condensation nuclei (CCN) concentration were performed during the Chemical Emission, Loss, Transformation, and Interactions with Canopies (CELTIC) ... -
A Study of the Response of Deep Tropical Clouds to Large-Scale Thermodynamic Forcings. Part II: Sensitivities to Microphysics, Radiation, and Surface Fluxes
(American Meteorological Society, 2007)The Goddard Cumulus Ensemble (GCE) model is used to examine the sensitivities of multiday 2D simulations of deep tropical convection to surface fluxes, interactive radiation, and ice microphysical processes. The simulations ... -
Dependence of Simulation of Boreal Summer Tropical Intraseasonal Oscillations on the Simulation of Seasonal Mean
(American Meteorological Society, 2007)The link between realism in simulation of the seasonal mean precipitation and summer tropical intraseasonal oscillations and their dependence on cumulus parameterization schemes is investigated using the Florida State ... -
Effects of Diurnal Variations on Tropical Equilibrium States: A Two-Dimensional Cloud-Resolving Modeling Study
(American Meteorological Society, 2007)Effects of diurnal variations on tropical heat and water vapor equilibrium states are investigated based on hourly data from two-dimensional cloud-resolving simulations. The model is integrated for 40 days and the simulations ... -
Interacting Mountain Waves and Boundary Layers
(American Meteorological Society, 2007)Linear hydrostatic 3D mountain wave theory is extended to include a thin frictional boundary layer (BL), parameterized using two characteristic relaxation times for wind adjustment. The character of the BL is described ... -
Direct Insertion of MODIS Radiances in a Global Aerosol Transport Model
(American Meteorological Society, 2007)In this paper results are presented from a simple offline assimilation system that uses radiances from the Moderate Resolution Imaging Spectroradiometer (MODIS) channels that sense atmospheric aerosols over land and ocean. ... -
Potential Vorticity as Meridional Coordinate
(American Meteorological Society, 2007)The dynamical equations of atmospheric flow are written using potential vorticity as the meridional coordinate and potential temperature as the vertical coordinate. Within this system, the atmosphere is divided into ... -
A Simple Model of the Millimeter-Wave Scattering Parameters of Randomly Oriented Aggregates of Finite Cylindrical Ice Hydrometeors
(American Meteorological Society, 2007)Spaceborne millimeter-wave radiometric measurements offer the potential to observe snowfall at high latitudes. A spaceborne W-band cloud radar on CloudSat has been able to observe snow. There is thus a need for a relatively ... -
Spectral Properties of One-Dimensional Diffusive Systems Subject to Stochastic Forcing
(American Meteorological Society, 2007)The vertical wavenumber and frequency spectra of horizontal wind and temperature in stochastically driven systems with diffusion, either due to uniform background eddy and molecular transport, or due to adjustment processes ...