Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4621-4640 of 13215
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Seasonal Variation of Aerosol Direct Radiative Forcing and Optical Properties Estimated from Ground-Based Solar Radiation Measurements
(American Meteorological Society, 2004)The surface direct radiative forcing and optical properties of aerosols have been analyzed from a ground-based solar radiation measurement, which was made under clear-sky conditions in Tsukuba, Japan, over two years from ... -
Characteristic Length Scales of Reactive Species in a Convective Boundary Layer
(American Meteorological Society, 2004)In this paper variance spectra of chemically active species in a dry convective boundary layer are studied by means of large-eddy simulations (LESs). The aim is to quantify the impact of chemistry on the spatial fluctuations ... -
On the Pressure Field in the Slope Wind Layer
(American Meteorological Society, 2003)It has been suggested by some authors that the momentum equation for thermally driven slope flow should contain a horizontal pressure gradient term, in addition to the buoyancy term. It is shown that this suggestion is ... -
Unified Treatment of Thermodynamic and Optical Variability in a Simple Model of Unresolved Low Clouds
(American Meteorological Society, 2003)Comparative studies of global climate models have long shown a marked sensitivity to the parameterization of cloud properties. Early attempts to quantify this sensitivity were hampered by diagnostic schemes that were ... -
Polarization of Thermal Microwave Atmospheric Radiation Due to Scattering by Ice Particles in Clouds
(American Meteorological Society, 2003)The polarization difference ?Tb between the vertical and horizontal components of thermal radiation emitted by clouds was studied using 37- and 85-GHz radiometers. The measurements were conducted during the Alliance Icing ... -
Bifurcation in Eddy Life Cycles: Implications for Storm Track Variability
(American Meteorological Society, 2003)By analyzing a number of very high resolution, nonhydrostatic experiments of baroclinic lifecycles, it was concluded that the intensity of the near-surface baroclinic development influences the upper-level wave to such an ... -
The Effects of Variations in Jet Width on the Growth of Baroclinic Waves: Implications for Midwinter Pacific Storm Track Variability
(American Meteorological Society, 2004)The effects of variations in jet width on the downstream growth of baroclinic waves are studied, using a simple quasigeostrophic model with a vertically varying basic state and variable channel width, as well as a simplified ... -
A New Look at the Problem of Tropical Cyclones in Vertical Shear Flow: Vortex Resiliency
(American Meteorological Society, 2004)A new paradigm for the resiliency of tropical cyclone (TC) vortices in vertical shear flow is presented. To elucidate the basic dynamics, the authors follow previous work and consider initially barotropic vortices on an f ... -
Spiral Bands in a Simulated Hurricane. Part II: Wave Activity Diagnostics
(American Meteorological Society, 2003)The theory of empirical normal modes (ENMs) was applied in a diagnostic study of the inner spiral bands formed in a simulated hurricane using the high-resolution Pennsylvania State University?National Center for Atmospheric ... -
Jovian Dynamics. Part III: Multiple, Migrating, and Equatorial Jets
(American Meteorological Society, 2003)Studies of the dynamical response of thin atmospheric layers overlying thick envelopes are extended to examine how multiple jets, such as those seen on Jupiter and Saturn, can be generated and maintained. The jets are ... -
Convective Asymmetries Associated with Tropical Cyclone Landfall. Part I: f-Plane Simulations
(American Meteorological Society, 2003)This study investigates the physical processes associated with changes in the convective structure of a tropical cyclone (TC) during landfall using the fifth-generation Pennsylvania State University?National Center for ... -
Midwinter Suppression of the Pacific Storm Track Activity as Seen in Aircraft Observations
(American Meteorological Society, 2003)Unassimilated observational data, from the years 1979 to 1993, are analyzed and compared to the NCEP?NCAR reanalysis data to confirm the magnitude of the seasonal cycle in Pacific storm track activity. Such a comparison ... -
Radiating Instabilities of Internal Inertio-Gravity Waves
(American Meteorological Society, 2003)The vertical radiation of local convective and shear instabilities of internal inertio-gravity waves is examined within linear stability theory. A steady, plane-parallel Boussinesq flow with vertical profiles of horizontal ... -
An Investigation of Turbulence Generation Mechanisms above Deep Convection
(American Meteorological Society, 2003)An investigation of the generation of turbulence above deep convection is presented. This investigation is motivated by an encounter between a commercial passenger aircraft and severe turbulence above a developing thunderstorm ... -
Size Statistics of Cumulus Cloud Populations in Large-Eddy Simulations
(American Meteorological Society, 2003)Cloud size distributions of shallow cumulus cloud populations are calculated using the large-eddy simulation (LES) approach. A range of different cases is simulated, and the results are compared to observations of real ... -
The Roles of the Horizontal Component of the Earth's Angular Velocity in Nonhydrostatic Linear Models
(American Meteorological Society, 2003)Roles of the horizontal component of the earth's rotation, which is neglected traditionally in atmospheric and oceanographic models, are studied through the normal mode analysis of a compressible and stratified model on a ... -
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(American Meteorological Society, 2003) -
Boundary Effects in Potential Vorticity Dynamics
(American Meteorological Society, 2003)Many aspects of geophysical flows can be described compactly in terms of potential vorticity dynamics. Since potential temperature can fluctuate at boundaries, however, the boundary conditions for potential vorticity ... -
The Microphysical Structure of Extreme Precipitation as Inferred from Ground-Based Raindrop Spectra
(American Meteorological Society, 2003)The controls on the variability of raindrop size distributions in extreme rainfall and the associated radar reflectivity?rain rate relationships are studied using a scaling-law formalism for the description of raindrop ... -
A Numerical Study of Cirrus Clouds. Part I: Model Description
(American Meteorological Society, 2003)This article, the first of a two-part series, presents a detailed description of a two-dimensional numerical cloud model directed toward elucidating the physical processes governing the evolution of cirrus clouds. The two ...