Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4801-4820 of 13215
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The Structure and Composition of the Annular Modes in an Aquaplanet General Circulation Model
(American Meteorological Society, 2002)The annular mode simulated by an atmospheric general circulation model with a zonally symmetric lower boundary is investigated. The annular mode, defined as the leading empirical orthogonal function (EOF) of the zonal-mean ... -
Entrainment into Mixed Layers. Part II: A New Closure
(American Meteorological Society, 2002)A new entrainment closure for convectively mixed boundary layers, particularly those topped by stratocumulus clouds, is developed and calibrated against results of large eddy simulations carried out by C.-H. Moeng. The ... -
Accounting for Unresolved Clouds in a 1D Infrared Radiative Transfer Model. Part I: Solution for Radiative Transfer, Including Cloud Scattering and Overlap
(American Meteorological Society, 2002)Various aspects of infrared radiative transfer through clouds are investigated. First, three solutions to the IR radiative transfer equation are presented and assessed, each corresponding to a different approximation for ... -
Accounting for Unresolved Clouds in a 1D Infrared Radiative Transfer Model. Part II: Horizontal Variability of Cloud Water Path
(American Meteorological Society, 2002)A 1D infrared radiative transfer model that handles clouds with subgrid-scale horizontal variability is developed and tested. It assumes that fluctuations in cloud absorptance optical depth ? across layers (and collections ... -
Sensitivity of Tropical Pacific Convection to Dry Layers at Mid- to Upper Levels: Simulation and Parameterization Tests
(American Meteorological Society, 2002)Numerical forecast experiments are carried out to investigate the implications of observed moisture variability in the tropical Pacific for deep convection. The study uses a series of quasi-cloud-resolving model forecasts ... -
Free Gravity Waves and Balanced Dynamics
(American Meteorological Society, 2002)It is shown how a renormalization technique, which is a variant of classical Krylov?Bogolyubov?Mitropol'skii averaging, can be used to obtain slow evolution equations for the vortical and inertia?gravity wave components ... -
Entrainment into Mixed Layers. Part I: Sharp-Edged and Smoothed Tops
(American Meteorological Society, 2002)A pervasive issue in the analysis of clear and cloud-containing convectively mixed layers is how to predict their growth through entrainment. This paper deals largely with the definition of the interface with the upper ... -
Comparison of Stratus Cloud Properties Deduced from Surface, GOES, and Aircraft Data during the March 2000 ARM Cloud IOP
(American Meteorological Society, 2002)Low-level stratus cloud microphysical properties derived from surface and Geostationary Operational Environmental Satellite (GOES) data during the March 2000 cloud intensive observational period (IOP) at the Atmospheric ... -
A Numerical Study on Appearance of the Runaway Greenhouse State of a Three-Dimensional Gray Atmosphere
(American Meteorological Society, 2002)A numerical study on the runaway greenhouse state is performed by using a general circulation model (GCM) with simplified hydrologic and radiative processes. Except for the inclusion of three-dimensional atmospheric motion, ... -
Effects of Domain Size and Numerical Resolution on the Simulation of Shallow Cumulus Convection
(American Meteorological Society, 2002)The authors present three-dimensional numerical simulations of oceanic trade cumulus clouds underlying stratocumulus clouds. The case studied is a Global Energy and Water Experiment (GEWEX) Cloud System Study (GCSS) model ... -
Numerical Experiments of Barotropic Flow Interaction with a 3D Obstacle
(American Meteorological Society, 2002)In this paper the results of numerical simulation experiments on the interaction between a neutrally stratified atmospheric flow and a symmetric 3D obstacle are presented and discussed. These experiments provide evidence ... -
Effect of Negative Vorticity on the Formation of Multiple Structure of Natural Vortices
(American Meteorological Society, 2002)If a cyclonic vortex is bounded by a zero isotach surrounding its center at some radius, it is inevitably accompanied by negative vorticity regions somewhere within it. Since the radial gradient of vorticity changes its ... -
Dependence of Singular Vector Structure and Evolution on the Choice of Norm
(American Meteorological Society, 2002)A diagnosis of singular vector (SV) evolution in the Eady model for the potential enstrophy and energy norms is performed using potential vorticity (PV) inversion and Eliassen?Palm (E?P) flux diagnostics, and compared with ... -
Using Neutral Singular Vectors to Study Low-Frequency Atmospheric Variability
(American Meteorological Society, 2002)The authors explore the use of the ?neutral vectors? of a linearized version of a global quasigeostrophic atmospheric model with realistic mean flow in the study of the nonlinear model's low-frequency variability. Neutral ... -
Momentum Budget of the East Antarctic Atmospheric Boundary Layer: Results of a Regional Climate Model
(American Meteorological Society, 2002)Output of a regional atmospheric climate model is used to quantify the average January and July momentum budget of the atmospheric boundary layer (ABL) over the East Antarctic ice sheet and the surrounding oceans. Results ... -
Parameterization of the Optical Properties of Sulfate Aerosols in the Infrared
(American Meteorological Society, 2002)Parameterizations of absorptance depth for ammonium sulfate [(NH4)2SO4], ammonium bisulfate (NH4HSO4), and sulfuric acid (H2SO4) in the infrared are provided for an eight-band model (covering 340?2500 cm?1) and for 32 ... -
LIRAD Observations of Tropical Cirrus Clouds in MCTEX. Part I: Optical Properties and Detection of Small Particles in Cold Cirrus
(American Meteorological Society, 2002)This paper presents further results on the optical properties of tropical and equatorial cirrus using the light detecting and ranging (lidar) radiometer (LIRAD) method. The results were obtained from observations in the ... -
LIRAD Observations of Tropical Cirrus Clouds in MCTEX. Part II: Optical Properties and Base Cooling in Dissipating Storm Anvil Clouds
(American Meteorological Society, 2002)During the Maritime Continent Thunderstorm Experiment (MCTEX), several decaying storm anvils were observed. The anvil clouds exhibited typical patterns of fallout and decay over a number of hours of observation. The anvil ... -
Interactions between Cloud Microphysics and Cumulus Convection in a General Circulation Model
(American Meteorological Society, 2002)In the Colorado State University general circulation model, cumulus detrainment of cloud water and cloud ice has been, up to now, the only direct coupling between convective and large-scale condensation processes. This ... -
Internal Interannual Variability of the Troposphere–Stratosphere Coupled System in a Simple Global Circulation Model. Part I: Parameter Sweep Experiment
(American Meteorological Society, 2002)Internal variations of the troposphere?stratosphere coupled system with intraseasonal and interannual timescales are investigated in a parameter sweep experiment with a simple global circulation model under a periodic ...