Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4941-4960 of 13215
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Lee-Vortex Formation in Free-Slip Stratified Flow over Ridges. Part II: Mechanisms of Vorticity and PV Production in Nonlinear Viscous Wakes
(American Meteorological Society, 2002)The formation of orographic wakes and vortices is studied within the context of numerically simulated viscous flow with uniform basic-state wind and stability past elongated free-slip ridges. The viscosity and thermal ... -
Atmospheric Energetics in the Wavelet Domain. Part I: Governing Equations and Interpretation for Idealized Flows
(American Meteorological Society, 2002)Orthonormal wavelet analysis of the primitive momentum equations enables a new formulation of atmospheric energetics, providing a new description of transfers and fluxes of kinetic energy (KE) between structures that are ... -
Lee-Vortex Formation in Free-Slip Stratified Flow over Ridges. Part I: Comparison of Weakly Nonlinear Inviscid Theory and Fully Nonlinear Viscous Simulations
(American Meteorological Society, 2002)The formation of lee wakes and vortices is explored in the context of stratified flow with uniform basic-state wind and stability past elongated free-slip ridges. The theory of inviscid flow past a ridge of small nondimensional ... -
Simulations of the Interannual Variability of Stratospheric Water Vapor
(American Meteorological Society, 2002)Observations and model results indicate that the quasi-biennial oscillation (QBO) modulation of stratospheric water vapor results from two causes. Dynamical redistribution of water vapor from the QBO-induced mean meridional ... -
Westward-Propagating Synoptic-Scale Disturbances and the ITCZ
(American Meteorological Society, 2002)In an attempt to understand the dynamics of the intertropical convergence zone (ITCZ), this study explores the extent to which the ITCZ is causally related to zonally propagating synoptic-scale disturbances. The ITCZ, ... -
Lightning Scaling Relations Revisited
(American Meteorological Society, 2002)Scaling relations connecting storm electrical generator power (and hence lightning flash rate) to charge transport velocity and storm geometry were originally posed by Vonnegut in the 1960s. These were later simplified to ... -
Variability of Aerosol Optical Properties at Four North American Surface Monitoring Sites
(American Meteorological Society, 2002)Aerosol optical properties measured over several years at surface monitoring stations located at Bondville, Illinois (BND); Lamont, Oklahoma (SGP); Sable Island, Nova Scotia (WSA); and Barrow, Alaska (BRW), have been ... -
Parameterization of the Dry Convective Boundary Layer Based on a Mass Flux Representation of Thermals
(American Meteorological Society, 2002)Presented is a mass flux parameterization of vertical transport in the convective boundary layer. The formulation of the new parameterization is based on an idealization of thermal cells or rolls. The parameterization is ... -
“Log-Chipper” Turbulence in the Convective Boundary Layer
(American Meteorological Society, 2002)Turbulent fluctuations of a conservative scalar in the atmospheric boundary layer (ABL) can be generated by a scalar flux at the surface, a scalar flux of entrainment at the ABL top, and the ?chewing up? of scalar variations ... -
An Updated Parameterization of Convectively Forced Gravity Wave Drag for Use in Large-Scale Models
(American Meteorological Society, 2002)An updated parameterization of gravity wave drag forced by subgrid-scale cumulus convection (GWDC) in large-scale models is proposed. For an analytical formulation of the cloud-top wave stress, two-dimensional, steady-state, ... -
New Perspectives on the Northern Hemisphere Winter Storm Tracks
(American Meteorological Society, 2002)The aim of this paper is to explore the use of both an Eulerian and system-centered method of storm track diagnosis applied to a wide range of meteorological fields at multiple levels to provide a range of perspectives on ... -
Reexamination of Riming Electrification in a Wind Tunnel
(American Meteorological Society, 2002)Riming electrification experiments have been conducted in a wind tunnel, focusing on the substantial difference in results reported by Takahashi in 1978 and by Jayaratne et al. in 1983. Three critical regimes were selected, ... -
Seasonal Variations in the Southern Hemisphere Storm Tracks and Associated Wave Propagation
(American Meteorological Society, 2002)Seasonal variations in the Southern Hemisphere (SH) storm track characteristics and associated wave propagation are studied using 19 years of NCEP?NCAR gridded data. It is found that the SH storm track is strongest in the ... -
Origin of Lapse Rate Changes in the Upper Tropical Troposphere
(American Meteorological Society, 2002)Vertical motions in clouds arise from a variety of thermodynamic processes, including latent heat release, evaporative cooling, melting, and cloud radiative heating. In the Tropics, the net upward vertical mass flux from ... -
Considerations for Stochastic Convective Parameterization
(American Meteorological Society, 2002)Convective parameterizations in general circulation models (GCMs) generally only aim to simulate the mean or first-order moment of convection; higher moments associated with subgrid variability are not explicitly considered. ... -
Gravity Waves from Fronts: Parameterization and Middle Atmosphere Response in a General Circulation Model
(American Meteorological Society, 2002)Current parameterizations of the gravity wave processes that are relevant to middle atmosphere general circulation modeling need to have specified somewhere in the lower atmosphere a number of characteristics of the gravity ... -
A New Dynamical Subgrid Model for the Planetary Surface Layer. Part II: Analytical Computation of Fluxes, Mean Profiles, and Variances
(American Meteorological Society, 2002)A new dynamical subgrid model for turbulent flow is used to derive the structure of the heat and momentum fluxes, mean wind and temperature profiles, and temperature and velocity variances, as a function of the Richardson ... -
Intermittent Turbulence and Oscillations in the Stable Boundary Layer over Land. Part I: A Bulk Model
(American Meteorological Society, 2002)In the stable boundary layer (SBL) it is observed often that turbulence is not continuous in space and time. This discontinuous, intermittent turbulence causes alternations from the mean evolution of the stratified atmospheric ... -
The Seasonal Variation of the Propagating Diurnal Tide in the Mesosphere and Lower Thermosphere. Part I: The Role of Gravity Waves and Planetary Waves
(American Meteorological Society, 2002)The seasonal variation of the propagating diurnal tide in the mesosphere and lower thermosphere is examined using results from a 2-yr simulation of the extended version of the Canadian Middle Atmosphere Model (CMAM). The ... -
Three-Dimensionality and Forcing of the Brewer–Dobson Circulation
(American Meteorological Society, 2002)Integrations with the nonlinear primitive equations are used to study 3D diabatic structure underlying the Brewer?Dobson circulation of the middle atmosphere. Such structure reveals zonally asymmetric contributions to mean ...