Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4141-4160 of 13215
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Internal Feedbacks from Monsoon–Midlatitude Interactions during Droughts in the Indian Summer Monsoon
(American Meteorological Society, 2009)Results from a 20-yr simulation of a high-resolution AGCM forced with climatological SST, along with simplified model experiments and supplementary data diagnostics, are used to investigate internal feedbacks arising from ... -
Acceleration of the Brewer–Dobson Circulation due to Increases in Greenhouse Gases
(American Meteorological Society, 2008)The acceleration of the Brewer?Dobson circulation under rising concentrations of greenhouse gases is investigated using the Whole Atmosphere Community Climate Model. The circulation strengthens as a result of increased ... -
The Influence of Near-Surface, High-Entropy Air in Hurricane Eyes on Maximum Hurricane Intensity
(American Meteorological Society, 2009)Using a time-dependent axisymmetric numerical model, the authors evaluate whether high-entropy air near the surface in hurricane eyes can substantially increase hurricanes? maximum intensity. This local high-entropy anomaly ... -
Estimation of Gravity Wave Momentum Flux and Phase Speeds from Quasi-Lagrangian Stratospheric Balloon Flights. Part II: Results from the Vorcore Campaign in Antarctica
(American Meteorological Society, 2008)The stratospheric gravity wave field in the Southern Hemisphere is investigated by analyzing observations collected by 27 long-duration balloons that flew between September 2005 and February 2006 over Antarctica and the ... -
Infrared Radiance Modeling by Optimal Spectral Sampling
(American Meteorological Society, 2008)This paper describes a rapid and accurate technique for the numerical modeling of band transmittances and radiances in media with nonhomogeneous thermodynamic properties (i.e., temperature and pressure), containing a mixture ... -
Understanding the Changes of Stratospheric Water Vapor in Coupled Chemistry–Climate Model Simulations
(American Meteorological Society, 2008)Past and future climate simulations from the Goddard Earth Observing System Chemistry?Climate Model (GEOS CCM), with specified boundary conditions for sea surface temperature, sea ice, and trace gas emissions, have been ... -
A Simple Stochastic Model for Generating Broken Cloud Optical Depth and Cloud-Top Height Fields
(American Meteorological Society, 2009)A simple and fast algorithm for generating two correlated stochastic two-dimensional (2D) cloud fields is described. The algorithm is illustrated with two broken cumulus cloud fields: cloud optical depth and cloud-top ... -
The Slope of Moist Symmetric Instability with Water Loading
(American Meteorological Society, 2008)Idealized numerical experiments, supported by analytic considerations, are performed to determine the preferred direction of symmetric instability when water loading is considered. It is concluded that the most unstable ... -
A Numerical Case Study on the Initiation of the Madden–Julian Oscillation
(American Meteorological Society, 2009)A mesoscale tropical channel model is used to study the long-standing problem of the initiation of the Madden?Julian oscillation (MJO). With initial and lateral boundary conditions provided by a global reanalysis, this ... -
Estimation of Gravity Wave Momentum Flux and Phase Speeds from Quasi-Lagrangian Stratospheric Balloon Flights. Part I: Theory and Simulations
(American Meteorological Society, 2008)A methodology for estimating gravity wave characteristics from quasi-Lagrangian observations provided by long-duration, superpressure balloon flights in the stratosphere is reviewed. Wavelet analysis techniques are used ... -
Analysis of Convective Transport and Parameter Sensitivity in a Single Column Version of the Goddard Earth Observation System, Version 5, General Circulation Model
(American Meteorological Society, 2009)Convection strongly influences the distribution of atmospheric trace gases. General circulation models (GCMs) use convective mass fluxes calculated by parameterizations to transport gases, but the results are difficult to ... -
Global Circulation in an Axially Symmetric Shallow Water Model Forced by Equinoctial Differential Heating
(American Meteorological Society, 2009)Solutions of an axially symmetric inviscid shallow-water model (SWM) on the earth forced by equinoctial differential heating are constructed using numerical integration of the time-dependent equations and analysis of their ... -
A Baroclinic Laminar State for Rotating Stratified Flows
(American Meteorological Society, 2008)A baroclinic laminar model is developed as the late-time equilibrium state in the free decay of rotating stratified turbulence under low-Froude-number scaling. Vertical motions are suppressed by stratification and ambient ... -
Scale Analysis for Large-Scale Tropical Atmospheric Dynamics
(American Meteorological Society, 2009)A systematic scale analysis is performed for large-scale dynamics over the tropics. It is identified that two regimes are competing: 1) a dynamics characterized by balance between the vertical advection term and diabatic ... -
The Moisture Mode in the Quasi-Equilibrium Tropical Circulation Model. Part II: Nonlinear Behavior on an Equatorial β Plane
(American Meteorological Society, 2009)Numerical calculations of a simplified quasi-equilibrium tropical circulation model (QTCM) on the equatorial ? plane have been performed to explore the nonlinear regime of the moisture mode. Sensitivity tests have examined ... -
Blocking in Areas of Complex Topography, and Its Influence on Rainfall Distribution
(American Meteorological Society, 2009)Using a 6-km-resolution regional climate simulation of Southern California, the effect of orographic blocking on the precipitation climatology is examined. To diagnose whether blocking occurs, precipitating hours are ... -
The Moisture Mode in the Quasi-Equilibrium Tropical Circulation Model. Part I: Analysis Based on the Weak Temperature Gradient Approximation
(American Meteorological Society, 2009)The moisture mode in a simplified version of the quasi-equilibrium tropical circulation model (QTCM) of Neelin and Zeng is analyzed. Perturbation expansion based on the ratio of temperature tendency to adiabatic cooling ... -
Effects of Finescale Debris on Near-Surface Tornado Dynamics
(American Meteorological Society, 2008)Debris clouds provide an important visual signature of tornadoes and can potentially significantly affect the wind structure, damage potential, and Doppler radar measurements of tornado wind speeds. To study such issues, ... -
On the Zonal Structure of the North Atlantic Oscillation and Annular Modes
(American Meteorological Society, 2009)The zonal structure and dynamics of the dipolar patterns of intraseasonal variability in the extratropical atmosphere?namely, the North Atlantic Oscillation (NAO) and the so-called annular modes of variability?are investigated ... -
Possible Aerosol Effects on Lightning Activity and Structure of Hurricanes
(American Meteorological Society, 2008)According to observations of hurricanes located relatively close to the land, intense and persistent lightning takes place within a 250?300-km radius ring around the hurricane center, whereas the lightning activity in the ...