Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4421-4440 of 13215
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Predictability and Error Growth Dynamics in Cloud-Resolving Models
(American Meteorological Society, 2007)While the benefits of ensemble techniques over deterministic numerical weather predictions (NWP) are now widely recognized, the prospects of ensemble prediction systems (EPS) at high computational resolution are still ... -
Annular Modes in a Multiple Migrating Zonal Jet Regime
(American Meteorological Society, 2007)The authors investigate the dynamics of zonal jets in a semihemisphere zonally reentrant ocean model. The forcings imposed in the model are an idealized atmospheric wind stress and relaxation to a latitudinal temperature ... -
An Approach for Convective Parameterization with Memory: Separating Microphysics and Transport in Grid-Scale Equations
(American Meteorological Society, 2007)An approach for convective parameterization is presented here, in which grid-scale budget equations of parameterization use separate microphysics and transport terms. This separation is used both as a way to introduce into ... -
Stochastic Backscatter for Cloud-Resolving Models. Part I: Implementation and Testing in a Dry Convective Boundary Layer
(American Meteorological Society, 2008)In simulations of deep convection with cloud-resolving models the turbulence is often rather poorly resolved, and the influence of the subfilter-scale parameterization used in such circumstances is probably greater than ... -
A Parameter Sweep Experiment on Quasiperiodic Variations of a Polar Vortex due to Wave–Wave Interaction in a Spherical Barotropic Model
(American Meteorological Society, 2007)Weakly nonlinear aspects of a barotropically unstable polar vortex in a forced?dissipative system with a zonally asymmetric surface topography are investigated in order to obtain a deeper understanding of rather periodic ... -
Dynamic Instabilities of Simulated Hurricane-like Vortices and Their Impacts on the Core Structure of Hurricanes. Part II: Moist Experiments
(American Meteorological Society, 2008)The energy flows of a simulated moist hurricane-like vortex are analyzed to examine the processes that change the intensity and structure of tropical cyclones. The moist vortex used in this study is initially axisymmetric ... -
On the Interaction of Jupiter’s Great Red Spot and Zonal Jet Streams
(American Meteorological Society, 2007)In this paper, Jupiter?s Great Red Spot (GRS) is used to determine properties of the Jovian atmosphere that cannot otherwise be found. These properties include the potential vorticity of the GRS and its neighboring jet ... -
Estimating Topographic Blocking Using a Froude Number When the Static Stability Is Nonuniform
(American Meteorological Society, 2008)A parameter widely used to predict topographic flow blocking is the nondimensional mountain height or, synonymously, the inverse Froude number. Predictions using this parameter are based on the morphology of flows with ... -
Advances in Radiative Transfer Modeling in Support of Satellite Data Assimilation
(American Meteorological Society, 2007)Development of fast and accurate radiative transfer models for clear atmospheric conditions has enabled direct assimilation of clear-sky radiances from satellites in numerical weather prediction models. In this article, ... -
Quasi-Steady Katabatic Winds on Slopes in Wide Valleys: Hydraulic Theory and Observations
(American Meteorological Society, 2008)Theoretical and field observational studies on mean velocity and temperature fields of quasi-steady nocturnal downslope (katabatic) flows on sloping surfaces are reported for the case of very wide valleys in the presence ... -
Impact of the Vertical Variation of Cloud Droplet Size on the Estimation of Cloud Liquid Water Path and Rain Detection
(American Meteorological Society, 2007)Cloud droplet effective radius (DER) and liquid water path (LWP) are two key parameters for the quantitative assessment of cloud effects on the exchange of energy and water. Chang and Li presented an algorithm using ... -
Interpretation of AIRS Data in Thin Cirrus Atmospheres Based on a Fast Radiative Transfer Model
(American Meteorological Society, 2007)A thin cirrus cloud thermal infrared radiative transfer model has been developed for application to cloudy satellite data assimilation. This radiation model was constructed by combining the Optical Path Transmittance ... -
The Origin of Nonlinear Signatures of Planetary Wave Dynamics: Mean Phase Space Tendencies and Contributions from Non-Gaussianity
(American Meteorological Society, 2007)Mean phase space tendencies are investigated to systematically identify the origin of nonlinear signatures and the dynamical significance of small deviations from Gaussianity of planetary low-frequency waves. A general ... -
The Remote Sensing of Clouds and Precipitation from Space: A Review
(American Meteorological Society, 2007)This paper presents a critical review of a number of popular methods that have been developed to retrieve cloud and precipitation properties from satellite radiance measurements. The emphasis of the paper is on the retrieval ... -
Energy Accumulation in Easterly Circumpolar Jets Generated by Two-Dimensional Barotropic Decaying Turbulence on a Rapidly Rotating Sphere
(American Meteorological Society, 2007)A series of numerical experiments on two-dimensional decaying turbulence is performed for a barotropic fluid on a rotating sphere. Numerical calculations have confirmed two important asymptotic features: emergence of the ... -
Satellite Data Assimilation in Numerical Weather Prediction Models. Part II: Uses of Rain-Affected Radiances from Microwave Observations for Hurricane Vortex Analysis
(American Meteorological Society, 2007)A hybrid variational scheme (HVAR) is developed to produce the vortex analysis associated with tropical storms. This scheme allows for direct assimilation of rain-affected radiances from satellite microwave instruments. ... -
Assimilation of Satellite Cloud Data into the GMAO Finite-Volume Data Assimilation System Using a Parameter Estimation Method. Part I: Motivation and Algorithm Description
(American Meteorological Society, 2007)General circulation models are unable to resolve subgrid-scale moisture variability and associated cloudiness and so must parameterize grid-scale cloud properties. This typically involves various empirical assumptions and ... -
A Fast Cloud Overlap Parameterization for Microwave Radiance Assimilation
(American Meteorological Society, 2007)The assimilation of cloud- and rain-affected radiances in numerical weather prediction systems requires fast and accurate radiative transfer models. One of the largest sources of modeling errors originates from the assumptions ... -
Another Look at Stochastic Condensation for Subgrid Cloud Modeling: Adiabatic Evolution and Effects
(American Meteorological Society, 2007)The theory of stochastic condensation, which models the impact of an ensemble of unresolved supersaturation fluctuations S? on the volume-averaged droplet-size distribution f?(r), is revisited in the modern context of ... -
SHDOMPPDA: A Radiative Transfer Model for Cloudy Sky Data Assimilation
(American Meteorological Society, 2007)The spherical harmonics discrete ordinate method for plane-parallel data assimilation (SHDOMPPDA) model is an unpolarized plane-parallel radiative transfer forward model, with corresponding tangent linear and adjoint models, ...