Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4861-4880 of 13215
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Empirical Normal Mode Diagnostic Study of the GEM Model's Dynamical Core
(American Meteorological Society, 2002)An algorithm based on the empirical normal mode analysis is used in a comparative study of the climatology and variability in dynamical-core experiments of the Global Environmental Multiscale model. The algorithm is proposed ... -
Wavenumber-2 and Wavenumber-m Vortex Rossby Wave Instabilities in a Generalized Three-Region Model
(American Meteorological Society, 2002)A recent study using a discrete three-region nondivergent approximation for the inner-core region of a mature hurricane-like vortex fails to catch wavenumber-2 azimuthal shear instabilities that are observed in experiments ... -
A Microwave Polarimetric Two-Stream Radiative Transfer Model
(American Meteorological Society, 2002)The assimilation of satellite microwave measurements and the retrieval of geophysical parameters require a fast and accurate radiative transfer model. In this study, a scheme is developed to solve the vector radiative ... -
A Simple Cloud Parameterization Derived from Cloud Resolving Model Data: Diagnostic and Prognostic Applications
(American Meteorological Society, 2002)A simple statistical parameterization of cloud water?related variables that has been originally developed for nonprecipitating boundary layer clouds is extended for all cloud types including deep precipitating convection. ... -
A New Surface Model for Cyclone–Anticyclone Asymmetry
(American Meteorological Society, 2002)Cyclonic vortices on the tropopause are characterized by compact structure and larger pressure, wind, and temperature perturbations when compared to broader and weaker anticyclones. Neither the origin of these vortices nor ... -
Application of a Perturbation Recycling Method in the Large-Eddy Simulation of a Mesoscale Convective Internal Boundary Layer
(American Meteorological Society, 2002)An arrangement of boundary conditions is described and demonstrated that facilitates the large-eddy simulation (LES) of inhomogeneous boundary layers such as internal boundary layers. In addition to the domain where the ... -
Wave Breaking and Mixing at the Subtropical Tropopause
(American Meteorological Society, 2002)This paper discusses Rossby wave breaking on the isentropic surfaces that intersect the subtropical tropopause, using winds and isentropic potential vorticity from high-resolution meteorological analysis. The focus is both ... -
Cirrus Parcel Model Comparison Project. Phase 1: The Critical Components to Simulate Cirrus Initiation Explicitly
(American Meteorological Society, 2002)The Cirrus Parcel Model Comparison Project, a project of the GCSS [Global Energy and Water Cycle Experiment (GEWEX) Cloud System Studies] Working Group on Cirrus Cloud Systems, involves the systematic comparison of current ... -
Effective Diameter in Radiation Transfer: General Definition, Applications, and Limitations
(American Meteorological Society, 2002)Although the use of an effective radius for radiation transfer calculations in water clouds has been common for many years, the export of this concept to ice clouds has been fraught with uncertainty, due to the nonspherical ... -
Estimation of Raindrop Size Distribution Parameters from Polarimetric Radar Measurements
(American Meteorological Society, 2002)Estimation of raindrop size distribution over large spatial and temporal scales has been a long-standing goal of polarimetric radar. Algorithms to estimate the parameters of a gamma raindrop size distribution model from ... -
Catalina Eddies and Coastally Trapped Disturbances
(American Meteorological Society, 2002)Observations show that coastally trapped disturbances (CTDs) often accompany Catalina eddies that appear in the southern California bight. In a previous modeling study of CTDs using simple environments and forcings, ... -
Vortex Formation in Ellipsoidal Thermal Bubbles
(American Meteorological Society, 2002)The rise of an isolated dry thermal bubble in a quiescent unstratified environment is a prototypical natural convective flow. This study considers the rise of an isolated dry thermal bubble of ellipsoidal shape (elliptical ... -
Cirrus Cloud Microphysical Property Retrieval Using Lidar and Radar Measurements. Part II: Midlatitude Cirrus Microphysical and Radiative Properties
(American Meteorological Society, 2002)The lidar?radar algorithm described in Part I of this set of papers is applied to ?1000 h of Raman lidar and millimeter wave cloud radar (MMCR) data collected at the Atmospheric Radiation Measurement program Southern Great ... -
Effects of Cloud Horizontal Inhomogeneity on the Optical Thickness Retrieved from Moderate-Resolution Satellite Data
(American Meteorological Society, 2002)Cloud remote sensing techniques are conventionally based on the independent pixel approximation (IPA). Here, three-dimensional (3D) radiative effects on IPA-based retrieved optical thickness from a visible-wavelength ... -
A Generalized Systems Theory for the Effect of Varying Fluctuations on Cloud Droplet Size Distributions
(American Meteorological Society, 2002)A systems theory has previously been developed by Liu and Hallett to interpret droplet size distributions in turbulent clouds by utilizing ideas from statistical physics and information theory. The present paper generalizes ... -
A Fractional Approach to the Factor Separation Method
(American Meteorological Society, 2002)A fractional study of the factor separation (FS) approach is performed. A fractional version of the FS method is discussed. The revised approach allows a determination of role of the acting physical mechanisms as well as ... -
Parameterizing Vertically Coherent Cloud Distributions
(American Meteorological Society, 2002)A parameterization for specifying subgrid-scale cloud distributions in atmospheric models is developed. The fractional area of a grid-scale column in which clouds from two levels overlap (i.e., the cloud overlap probability) ... -
Local Energy Generation in Barotropic Flows
(American Meteorological Society, 2002)The local growth of disturbances to a steady, nondivergent shear flow is investigated in the context of the barotropic vorticity equation (BVE). A new expression for the instantaneous energy generation rate is derived by ... -
Mixed Rossby–Gravity Waves and Western Pacific Tropical Cyclogenesis. Part I: Synoptic Evolution
(American Meteorological Society, 2002)A large-amplitude mixed Rossby?gravity wave packet is identified in the western Pacific using 6?10-day bandpass-filtered winds. Individual disturbances of 2300?3000-km wavelength propagated westward as the packet moved ... -
Structure of the Atmosphere in Radiative–Convective Equilibrium
(American Meteorological Society, 2002)To investigate water vapor transport in an atmosphere in radiative?convective equilibrium, a simplified dynamical convection model (DCM) was constructed that explicitly models moist convection and longwave radiation in a ...