Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3041-3060 of 13215
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Large-Eddy Simulation of Stably Stratified Atmospheric Boundary Layer Turbulence: A Scale-Dependent Dynamic Modeling Approach
(American Meteorological Society, 2006)A new tuning-free subgrid-scale model, termed locally averaged scale-dependent dynamic (LASDD) model, is developed and implemented in large-eddy simulations (LES) of stable boundary layers. The new model dynamically computes ... -
Optical and Microphysical Properties of Upper Clouds Measured with the Raman Lidar and Hydrometeor Videosonde: A Case Study on 29 March 2004 over Tsukuba, Japan
(American Meteorological Society, 2006)Optical and microphysical properties of the upper clouds at an altitude range of 5?11 km were measured over Tsukuba, Japan, on 29?30 March 2004 using a ground-based Raman lidar and a balloon-borne hydrometeor videosonde ... -
On the Self-Maintenance of Midlatitude Jets
(American Meteorological Society, 2006)In this paper an atmospheric jet is considered self-maintaining if the overall effect of baroclinic eddies is to preserve or enhance its westerly shear with height. Observations suggest that the wintertime jets in Earth?s ... -
Predictability of Precipitation from Continental Radar Images. Part IV: Limits to Prediction
(American Meteorological Society, 2006)Predictability of precipitation is examined from storm to synoptic scales through an experimental approach using continent-scale radar composite images. The lifetime of radar reflectivity patterns in Eulerian and Lagrangian ... -
Role of the Low-Frequency Deformation Field on the Explosive Growth of Extratropical Cyclones at the Jet Exit. Part II: Baroclinic Critical Region
(American Meteorological Society, 2006)Midlatitude cyclones tend to develop strongly in specific locations relative to the large-scale flow, such as jet-exit zones. Here, the approach developed in Part I that highlights the role of large-scale deformation in ... -
An Idealized Nonlinear Model of the Northern Hemisphere Winter Storm Tracks
(American Meteorological Society, 2006)In this paper, a nonlinear dry model, forced by fixed radiative forcing alone, has been constructed to simulate the Northern Hemisphere winter storm tracks. A procedure has been devised to iterate the radiative equilibrium ... -
Regimes in Simple Systems
(American Meteorological Society, 2006)Dynamical systems possessing regimes are identified with those where the state space possesses two or more regions such that transitions of the state from either region to the other are rare. Systems with regimes are ... -
Collisions of Small Drops in a Turbulent Flow. Part III: Relative Droplet Fluxes and Swept Volumes
(American Meteorological Society, 2006)Swept volumes of cloud droplets with radii below 20 ?m are calculated under conditions typical of atmospheric cloud turbulence characterized by enormous values of Reynolds numbers, high turbulent intermittency, and ... -
Role of the Low-Frequency Deformation Field on the Explosive Growth of Extratropical Cyclones at the Jet Exit. Part I: Barotropic Critical Region
(American Meteorological Society, 2006)By using new theoretical results on perturbation growth in spatially and temporally complex quasigeostrophic flows, this paper investigates the role of the large-scale deformation field on extratropical cyclones and ... -
An Elicitation of the Dynamic Nature of Water Vapor Feedback in Climate Change Using a 1D Model
(American Meteorological Society, 2006)The concept of feedback has been used by several authors in the field of climate science to describe the behavior of models and to assess the importance of the different mechanisms at stake. Here, a simple 1D model of ... -
The Response of Damaging Winds of a Simulated Tropical Cyclone to Finite-Amplitude Perturbations of Different Variables
(American Meteorological Society, 2006)Four-dimensional variational data assimilation (4DVAR) is an established data assimilation method that finds the finite-amplitude perturbation that best fits observations consistent with a priori information and model ... -
Very Early Formation of Big, Liquid Drops Revealed by ZDR in Continental Cumulus
(American Meteorological Society, 2006)Examination of the early radar echo histories of several vigorous, cumulus clouds in northeast Colorado and northwest Kansas, with sensitive, dual-polarization radar, reveals the formation of millimeter-sized water drops ... -
A Mass-Flux Scheme View of a High-Resolution Simulation of a Transition from Shallow to Deep Cumulus Convection
(American Meteorological Society, 2006)In this paper, an idealized, high-resolution simulation of a gradually forced transition from shallow, nonprecipitating to deep, precipitating cumulus convection is described; how the cloud and transport statistics evolve ... -
Parameterization of Pressure Perturbations in a PBL Mass-Flux Model
(American Meteorological Society, 2006)In a companion paper, the authors presented a boundary layer parameterization that was based on the mass-flux concept and included an internally consistent representation of the vertical flux of horizontal momentum. In the ... -
Solar Tides as Revealed by Measurements of Mesosphere Temperature by the MLS Experiment on UARS
(American Meteorological Society, 2006)Temperatures between 25 and 86 km measured by the Microwave Limb Sounder (MLS) experiment on the Upper Atmosphere Research Satellite (UARS) are analyzed to delineate diurnal, semidiurnal, and terdiurnal tidal structures ... -
Dynamics of Synoptic Eddy and Low-Frequency Flow Interaction. Part I: A Linear Closure
(American Meteorological Society, 2006)The interaction between synoptic eddy and low-frequency flow (SELF) has been recognized for decades to play an important role in the dynamics of the low-frequency variability of the atmospheric circulation. In this three-part ... -
Empirical Mode Reduction in a Model of Extratropical Low-Frequency Variability
(American Meteorological Society, 2006)This paper constructs and analyzes a reduced nonlinear stochastic model of extratropical low-frequency variability. To do so, it applies multilevel quadratic regression to the output of a long simulation of a global ... -
Dynamics of Synoptic Eddy and Low-Frequency Flow Interaction. Part III: Baroclinic Model Results
(American Meteorological Society, 2006)In this three-part study, a linear closure has been developed for the synoptic eddy and low-frequency flow (SELF) interaction and demonstrated that internal dynamics plays an important role in generating the leading ... -
Solar Semidiurnal Tide in the Dusty Atmosphere of Mars
(American Meteorological Society, 2006)Vertical coupling due to the solar semidiurnal tide in Mars's atmosphere, and effects on zonal mean temperature and wind structures, are investigated using a numerical model. The model provides self-consistent solutions ... -
Dynamics of Synoptic Eddy and Low-Frequency Flow Interaction. Part II: A Theory for Low-Frequency Modes
(American Meteorological Society, 2006)Amidst stormy atmospheric circulation, there are prominent recurrent patterns of variability in the planetary circulation, such as the Antarctic Oscillation (AAO), Arctic Oscillation (AO) or North Atlantic Oscillation ...