Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4301-4320 of 13215
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A Generalization of Lorenz’s Model for the Predictability of Flows with Many Scales of Motion
(American Meteorological Society, 2008)In a seminal paper, E. N. Lorenz proposed that flows with many scales of motion in which smaller-scale error spreads to larger scales and in which the error-doubling time decreases with decreasing scale have a finite range ... -
Stratified Turbulence: A Possible Interpretation of Some Geophysical Turbulence Measurements
(American Meteorological Society, 2008)Several existing sets of smaller-scale ocean and atmospheric data appear to display Kolmogorov?Obukov?Corrsin inertial ranges in horizontal spectra for length scales up to at least a few hundred meters. It is argued here ... -
Shortwave Radiative Impacts from Aerosol Effects on Marine Shallow Cumuli
(American Meteorological Society, 2008)The net shortwave radiative impact of aerosol on simulations of two shallow marine cloud cases is investigated using a Monte Carlo radiative transfer model. For a shallow cumulus case, increased aerosol concentrations are ... -
A Moisture-Stratiform Instability for Convectively Coupled Waves
(American Meteorological Society, 2008)A simple model of two vertical modes is constructed and analyzed to reveal the basic instability mechanisms of convectively coupled waves. The main novelty of this model is a convective parameterization based on the ... -
Sensitivity of a Large Ensemble of Tropical Convective Systems to Changes in the Thermodynamic and Dynamic Forcings
(American Meteorological Society, 2008)A two-dimensional cloud-resolving model (CRM) is used to perform five sets of simulations of 68 deep convective cloud objects identified with Clouds and the Earth?s Radiant Energy System (CERES) data to examine their ... -
Large-Eddy Simulation of Evaporatively Driven Entrainment in Cloud-Topped Mixed Layers
(American Meteorological Society, 2008)Cloud-top entrainment instability (CTEI) is a hypothesized positive feedback between cloud-top entrainment and enhanced turbulence associated with buoyancy reversal. A sufficiently strong positive feedback is hypothesized ... -
Tropical Cyclone Energy Dispersion in a Three-Dimensional Primitive Equation Model: Upper-Tropospheric Influence
(American Meteorological Society, 2008)The three-dimensional (3D) Rossby wave energy dispersion of a tropical cyclone (TC) is studied using a baroclinic primitive equation model. The model is initialized with a symmetric vortex on a beta plane in an environment ... -
Large-Eddy Simulations and Observations of Atmospheric Marine Boundary Layers above Nonequilibrium Surface Waves
(American Meteorological Society, 2008)Winds and waves in marine boundary layers are often in an unsettled state when fast-running swell generated by distant storms propagates into local regions and modifies the overlying turbulent fields. A large-eddy simulation ... -
Aerosol Effects on Clouds, Precipitation, and the Organization of Shallow Cumulus Convection
(American Meteorological Society, 2008)This study investigates the effects of aerosol on clouds, precipitation, and the organization of trade wind cumuli using large eddy simulations (LES). Results show that for this shallow-cumulus-under-stratocumulus case, ... -
Dynamics of Eddy-Driven Low-Frequency Dipole Modes. Part IV: Planetary and Synoptic Wave-Breaking Processes during the NAO Life Cycle
(American Meteorological Society, 2008)Based on a highly idealized, analytical solution of the North Atlantic Oscillation (NAO) derived in Part III of this series, it is shown that wave breaking is not a necessary condition for the occurrence of NAO events. The ... -
The Extratropical Tropopause Inversion Layer: Global Observations with GPS Data, and a Radiative Forcing Mechanism
(American Meteorological Society, 2007)Global characteristics of the extratropical tropopause inversion layer identified in radiosonde observations by Birner are studied using high vertical resolution temperature profiles from GPS radio occultation measurements. ... -
Eddy-Mediated Regime Transitions in the Seasonal Cycle of a Hadley Circulation and Implications for Monsoon Dynamics
(American Meteorological Society, 2008)In a simulation of seasonal cycles with an idealized general circulation model without a hydrologic cycle and with zonally symmetric boundary conditions, the Hadley cells undergo transitions between two regimes distinguishable ... -
Morphology of Tropical Upwelling in the Lower Stratosphere
(American Meteorological Society, 2008)Sensitivity tests of a mechanistic model of the mean meridional circulation driven by specified eddy forcing are conducted to investigate how the morphology of tropical upwelling in the lower stratosphere is related to the ... -
Comments on “A Method to Estimate Aerosol Radiative Forcing from Spectral Optical Depths”
(American Meteorological Society, 2008) -
Using Singular Value Decomposition to Parameterize State-Dependent Model Errors
(American Meteorological Society, 2008)The purpose of the present study is to use a new method of empirical model error correction, developed by Danforth et al. in 2007, based on estimating the systematic component of the nonperiodic errors linearly dependent ... -
Why Precipitation Is Mostly Concentrated over Islands in the Maritime Continent
(American Meteorological Society, 2008)High-resolution observations and regional climate model simulations reveal that precipitation over the Maritime Continent is mostly concentrated over islands. Analysis of the diurnal cycles of precipitation and winds ... -
Rapid Filamentation Zone in a Numerically Simulated Tropical Cyclone
(American Meteorological Society, 2008)In a recent study, Rozoff et al. proposed a possible mechanism to explain the formation and maintenance of the weak-echo annulus (or moat) outside of the primary eyewall of a tropical cyclone observed in radar images. By ... -
A Large Annual Cycle in Ozone above the Tropical Tropopause Linked to the Brewer–Dobson Circulation
(American Meteorological Society, 2007)Near-equatorial ozone observations from balloon and satellite measurements reveal a large annual cycle in ozone above the tropical tropopause. The relative amplitude of the annual cycle is large in a narrow vertical layer ... -
3D Chaotic Model for Subgrid Turbulent Dispersion in Large Eddy Simulations
(American Meteorological Society, 2008)A 3D multiscale kinematic velocity field is introduced as a model to simulate Lagrangian turbulent dispersion. The incompressible velocity field is a nonlinear deterministic function, periodic in space and time, that ... -
Multicloud Models for Organized Tropical Convection: Enhanced Congestus Heating
(American Meteorological Society, 2008)Despite the recent advances in supercomputing, the current general circulation models (GCMs) poorly represent the large-scale variability associated with tropical convection. Multicloud model convective parameterizations ...