Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4261-4280 of 13215
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(American Meteorological Society, 2008) -
Intertropical Convergence Zones during the Active Season in Daily Data
(American Meteorological Society, 2008)Synoptic-scale variability of vorticity structures in the lower troposphere of the tropics is analyzed in 23 yr of daily averaged high-resolution reanalysis data. The vorticity structures can be divided into zonally elongated ... -
Can a Descending Rain Curtain in a Supercell Instigate Tornadogenesis Barotropically?
(American Meteorological Society, 2008)This paper investigates whether the descending rain curtain associated with the hook echo of a supercell can instigate a tornado through a purely barotropic mechanism. A simple numerical model of a mesocyclone is constructed ... -
Factors Affecting ENSO’s Period
(American Meteorological Society, 2008)Accurately capturing the observed mean period of ENSO in general circulation models (GCMs) is often challenging, and it is therefore useful to understand which parameters and processes affect this period. A computationally ... -
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(American Meteorological Society, 2008) -
Implementing the Delta-Four-Stream Approximation for Solar Radiation Computations in an Atmosphere General Circulation Model
(American Meteorological Society, 2008)Proper quantification of the solar radiation budget and its transfer within the atmosphere is of utmost importance in climate modeling. The delta-four-stream (DFS) approximation has been demonstrated to offer a more accurate ... -
Distance-Scaled Water Concentrations versus Mass-Median Drop Size, Temperature, and Altitude in Supercooled Clouds
(American Meteorological Society, 2008)About 28 000 nautical miles (n mi) of select in-flight measurements of liquid water content (LWC), droplet sizes, temperature, and other variables in supercooled clouds from a variety of research projects over portions of ... -
Statistics of an Unstable Barotropic Jet from a Cumulant Expansion
(American Meteorological Society, 2008)Low-order equal-time statistics of a barotropic flow on a rotating sphere are investigated. The flow is driven by linear relaxation toward an unstable zonal jet. For relatively short relaxation times, the flow is dominated ... -
A Modified Dynamic Framework for the Atmospheric Spectral Model and Its Application
(American Meteorological Society, 2008)This paper describes a dynamic framework for an atmospheric general circulation spectral model in which a reference stratified atmospheric temperature and a reference surface pressure are introduced into the governing ... -
On the Climate Impact of Surface Roughness Anomalies
(American Meteorological Society, 2008)Large-scale deployment of wind power may alter climate through alteration of surface roughness. Previous research using GCMs has shown large-scale impacts of surface roughness perturbations but failed to elucidate the ... -
Factors Determining the Impact of Aerosols on Surface Precipitation from Clouds: An Attempt at Classification
(American Meteorological Society, 2008)The simulation of the dynamics and the microphysics of clouds observed during the Large-Scale Biosphere?Atmosphere Experiment in Amazonia?Smoke, Aerosols, Clouds, Rainfall, and Climate (LBA?SMOCC) campaign, as well as ... -
Small-Scale Moist Turbulence in Numerically Generated Convective Clouds
(American Meteorological Society, 2008)The authors present simulations of cloud-free and cloudy, nonprecipitating, convective turbulence at spatial resolutions down to ?x = 2.6 m for a domain size of (1 km)3. The runs are analyzed with attention focused on the ... -
Exponential Smallness of Inertia–Gravity Wave Generation at Small Rossby Number
(American Meteorological Society, 2008)This paper discusses some of the mechanisms whereby fast inertia?gravity waves can be generated spontaneously by slow, balanced atmospheric and oceanic flows. In the small Rossby number regime relevant to midlatitude ... -
Comments on “Time Step Sensitivity of Nonlinear Atmospheric Models: Numerical Convergence, Truncation Error Growth, and Ensemble Design”
(American Meteorological Society, 2008) -
Climate Response of Linear and Quadratic Functionals Using the Fluctuation–Dissipation Theorem
(American Meteorological Society, 2008)A generalization of the fluctuation?dissipation theorem (FDT) that allows generation of linear response operators that estimate the response of functionals of system state variables is tested for a system defined by an ... -
Characteristics of Summer Airflow over the Antarctic Peninsula in Response to Recent Strengthening of Westerly Circumpolar Winds
(American Meteorological Society, 2008)Summer near-surface temperatures over the northeast coast of the Antarctic Peninsula have increased by more than 2°C over the past 40 years, a temperature increase 3 times greater than that on the northwest coast. Recent ... -
CO2 Condensation in Baroclinic Eddies on Early Mars
(American Meteorological Society, 2008)The efficacy of a cloud-radiative feedback on early Mars is reexamined in the context of the theory of baroclinic waves in midlatitudes. The feedback has been proposed to explain fluvial features on the surface of Mars. ... -
Response of Simulated Squall Lines to Low-Level Cooling
(American Meteorological Society, 2008)Organized convection has long been recognized to have a nocturnal maximum over the central United States. The present study uses idealized numerical simulations to investigate the mechanisms for the maintenance, propagation, ... -
A Probabilistic Theory for Balance Dynamics
(American Meteorological Society, 2008)Balance dynamics are proposed in a probabilistic framework, assuming that the state variables and the master, or control, variables are random variables described by continuous probability density functions. Balance ... -
A Bulk Parameterization of Giant CCN
(American Meteorological Society, 2008)A parameterization for giant cloud condensation nuclei (GCCN), suitable for use in bulk microphysical models, has been developed that uses precise representations of the condensational growth of aerosol particles in the ...