Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4381-4400 of 13215
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Two-Dimensional Idealized Simulations of the Impact of Multiple Windward Ridges on Orographic Precipitation
(American Meteorological Society, 2008)This paper presents two-dimensional (2D) idealized simulations at 1-km grid spacing using the fifth-generation Pennsylvania State University?National Center for Atmospheric Research (PSU?NCAR) Mesoscale Model (MM5) in order ... -
A Total Turbulent Energy Closure Model for Neutrally and Stably Stratified Atmospheric Boundary Layers
(American Meteorological Society, 2007)This paper presents a turbulence closure for neutral and stratified atmospheric conditions. The closure is based on the concept of the total turbulent energy. The total turbulent energy is the sum of the turbulent kinetic ... -
Fragmentation of Freezing Drops in Shallow Maritime Frontal Clouds
(American Meteorological Society, 2008)Images of frozen drops with pieces missing were collected on two days of airborne sampling in shallow supercooled stratiform frontal clouds in the coastal waters of Washington State. In those limited regions where ice ... -
Unimodality of Wave Amplitude in the Northern Hemisphere
(American Meteorological Society, 2008)A novel statistic for local wave amplitude of the 500-hPa geopotential height field is introduced. The statistic uses a Hilbert transform to define a longitudinal wave envelope and dynamical latitude weighting to define ... -
A Comparison of Statistical Dynamical and Ensemble Prediction Methods during Blocking
(American Meteorological Society, 2008)In this paper error growth is examined using a family of inhomogeneous statistical closure models based on the quasi-diagonal direct interaction approximation (QDIA), and the results are compared with those based on ensembles ... -
Is a Real Cyclogenesis Case Explained by Generalized Linear Baroclinic Instability?
(American Meteorological Society, 2007)Midlatitude cyclogenesis is currently often explained as resulting from the baroclinic instability of a jet flow. The present formulation of the theory, essentially resulting from the deep revision performed by Farrell, ... -
Use of High-Resolution Satellite Observations to Evaluate Cloud and Precipitation Statistics from Cloud-Resolving Model Simulations. Part I: South China Sea Monsoon Experiment
(American Meteorological Society, 2007)Cloud and precipitation simulated using the three-dimensional (3D) Goddard Cumulus Ensemble (GCE) model are compared to Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) and Precipitation Radar (PR) rainfall ... -
A New Parameterization of an Asymmetry Factor of Cirrus Clouds for Climate Models
(American Meteorological Society, 2007)The aspect ratio (AR) of a nonspherical ice particle is identified as the key microphysical parameter to determine its asymmetry factor for solar radiation. The mean effective AR is defined for cirrus clouds containing ... -
Weather-Layer Dynamics of Baroclinic Eddies and Multiple Jets in an Idealized General Circulation Model
(American Meteorological Society, 2008)The general circulation and the behavior of multiple jets and baroclinic eddies are described for an atmosphere in which meridional potential temperature gradients and eddies are confined to a weather layer. The weather ... -
Nonlinear Atmospheric Adjustment to Momentum Forcing
(American Meteorological Society, 2008)A nonlinear, numerical model of a dry, compressible atmosphere is used to simulate the hydrostatic and geostrophic adjustment to a localized prescribed injection of momentum applied over 5 min. with a size characteristic ... -
Potential Vorticity Diagnosis in the Quasigeostrophic and Nonlinear Balance Systems
(American Meteorological Society, 2008)Quantitative diagnosis of low-Rossby-number flows using potential vorticity (PV) includes using elements of PV advection to deduce instantaneous tendencies of the balanced atmospheric state, most commonly the geopotential ... -
The Sensitivity of the Isentropic Slope in a Primitive Equation Dry Model
(American Meteorological Society, 2008)This paper discusses the sensitivity of the isentropic slope in a primitive equation dry model forced with Newtonian cooling when the heating is varied. This is done in two different ways, changing either the radiative ... -
Aerosol–Cloud Interactions in a Mesoscale Model. Part II: Sensitivity to Aqueous-Phase Chemistry
(American Meteorological Society, 2008)The feedbacks between aerosols, cloud microphysics, and cloud chemistry are investigated in a mesoscale model. A simple bulk aqueous-phase sulfur chemistry scheme was fully coupled to the existing aerosol and microphysics ... -
Large-Eddy Simulation of the Onset of the Sea Breeze
(American Meteorological Society, 2007)This paper describes results from a large-eddy simulation (LES) model used in an idealized setting to simulate the onset of the sea breeze. As the LES is capable of simulating boundary layer?scale, three-dimensional ... -
Effects of Nonlinearity on Convectively Forced Internal Gravity Waves: Application to a Gravity Wave Drag Parameterization
(American Meteorological Society, 2008)In the present study, the authors propose a way to include a nonlinear forcing effect on the momentum flux spectrum of convectively forced internal gravity waves using a nondimensional numerical model (NDM) in a two-dimensional ... -
Dissipation of Synoptic-Scale Flow by Small-Scale Turbulence
(American Meteorological Society, 2008)Although it is now accepted that imbalance in the atmosphere and ocean is generic, the feedback of the unbalanced motion on the balanced flow has not received much attention. In this work the parameterization problem is ... -
Is There a Diurnal Cycle in the Summer Cloud-Capped Arctic Boundary Layer?
(American Meteorological Society, 2007)Data from the Arctic Ocean Experiment 2001 (AOE-2001) are used to study the vertical structure and diurnal cycle of the summertime central Arctic cloud-capped boundary layer. Mean conditions show a shallow stratocumulus-capped ... -
A Stochastic Parameterization for Deep Convection Based on Equilibrium Statistics
(American Meteorological Society, 2008)A stochastic parameterization scheme for deep convection is described, suitable for use in both climate and NWP models. Theoretical arguments and the results of cloud-resolving models are discussed in order to motivate the ... -
A Thermal Plume Model for the Convective Boundary Layer: Representation of Cumulus Clouds
(American Meteorological Society, 2008)The ?thermal plume model,? a mass-flux scheme combined with a classical diffusive approach, originally developed to represent turbulent transport in the dry convective boundary layer, is extended here to the representation ... -
Numerical Simulation of Baroclinic Waves with a Parameterized Boundary Layer
(American Meteorological Society, 2007)A dry three-dimensional baroclinic life cycle model is used to investigate the role of turbulent fluxes of heat and momentum within the boundary layer on midlatitude cyclones. Simulations are performed of life cycles for ...