Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3761-3780 of 13215
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The Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office’s Climate Model. Part II: Variability
(American Meteorological Society, 2010)Stratospheric variability is examined in a vertically extended version of the Met Office global climate model. Equatorial variability includes the simulation of an internally generated quasi-biennial oscillation (QBO) and ... -
Partially Coherent Backscatter in Radar Observations of Precipitation
(American Meteorological Society, 2010)Classical radar theory only considers incoherent backscatter from precipitation. Can precipitation generate coherent scatter as well? Until now, the accepted answer has been no, because hydrometeors are distributed sparsely ... -
Interpreting Stationary Wave Nonlinearity in Barotropic Dynamics
(American Meteorological Society, 2010)Stationary wave nonlinearity describes the self-interaction of stationary waves and is important in maintaining the zonally asymmetric atmospheric general circulation. However, the dynamics of stationary wave nonlinearity, ... -
Persistent Multiple Jets and PV Staircase
(American Meteorological Society, 2010)The persistence of multiple jets is investigated with a quasigeostrophic, two-layer, ?-plane channel model. Linearly unstable normal modes are found to be capable of qualitatively describing the eddy fluxes of the nonlinear ... -
Source of Gravity Waves within a Vortex-Dipole Jet Revealed by a Linear Model
(American Meteorological Society, 2010)This study develops a linear numerical model to address the source mechanism of the gravity waves generated within a vortex dipole simulated in a fully nonlinear nonhydrostatic mesoscale model. The background flow for this ... -
A Cumulus Parameterization with State-Dependent Entrainment Rate. Part II: Impact on Climatology in a General Circulation Model
(American Meteorological Society, 2010)The impact of a new cumulus parameterization developed in Part I of this paper on climatology in an atmospheric general circulation model (AGCM) is compared with that of the Arakawa?Schubert scheme. The parameterization ... -
Midlevel Ventilation’s Constraint on Tropical Cyclone Intensity
(American Meteorological Society, 2010)Midlevel ventilation, or the flux of low-entropy air into the inner core of a tropical cyclone (TC), is a hypothesized mechanism by which environmental vertical wind shear can constrain a tropical cyclone?s intensity. An ... -
The Response of Simulated Nocturnal Convective Systems to a Developing Low-Level Jet
(American Meteorological Society, 2010)Some recent numerical experiments have examined the dynamics of initially surface-based squall lines that encounter an increasingly stable boundary layer, akin to what occurs with the onset of nocturnal cooling. The present ... -
Evaluating Boundary Layer–Based Mass Flux Closures Using Cloud-Resolving Model Simulations of Deep Convection
(American Meteorological Society, 2010)High-resolution three-dimensional cloud resolving model simulations of deep cumulus convection under a wide range of large-scale forcings are used to evaluate a mass flux closure based on boundary layer convective inhibition ... -
Saturn’s Northern Hemisphere Ribbon: Simulations and Comparison with the Meandering Gulf Stream
(American Meteorological Society, 2010)Voyager observations of Saturn in 1980?81 discovered a wavy feature engirdling the planet at 47°N planetographic latitude. Its latitude coincides with that of an eastward jet stream, which is the second fastest on Saturn ... -
Transient Dynamics of Nonsymmetric Perturbations versus Symmetric Instability in Baroclinic Zonal Shear Flows
(American Meteorological Society, 2010)The linear dynamics of symmetric and nonsymmetric perturbations in unbounded zonal inviscid flows with a constant vertical shear of velocity, when a fluid is incompressible and density is stably stratified along the vertical ... -
A Cumulus Parameterization with State-Dependent Entrainment Rate. Part I: Description and Sensitivity to Temperature and Humidity Profiles
(American Meteorological Society, 2010)A new cumulus parameterization is developed for which an entraining plume model is adopted. The lateral entrainment rate varies vertically depending on the surrounding environment. Two different formulations are examined ... -
Surface Pressure Features of Landfalling Typhoon Rainbands and Their Possible Causes
(American Meteorological Society, 2010)This study uses temporally high-resolution surface observations, Doppler radar, and micro rain radar to document the finescale features of the two landfalling rainbands associated with Typhoon Longwang (2005) as they passed ... -
A Conceptual View on Inertial Oscillations and Nocturnal Low-Level Jets
(American Meteorological Society, 2010)In the present work Blackadar?s concept of nocturnal inertial oscillations is extended. Blackadar?s concept describes frictionless inertial oscillations above the nocturnal inversion layer. The current work includes ... -
Residual Circulation and Tropopause Structure
(American Meteorological Society, 2010)The effect of large-scale dynamics as represented by the residual mean meridional circulation in the transformed Eulerian sense, in particular its stratospheric part, on lower stratospheric static stability and tropopause ... -
Relationships of Biomass-Burning Aerosols to Ice in Orographic Wave Clouds
(American Meteorological Society, 2010)Ice concentrations in orographic wave clouds at temperatures between ?24° and ?29°C were shown to be related to aerosol characteristics in nearby clear air during five research flights over the Rocky Mountains. When clouds ... -
A Spectral Parameterization of Drag, Eddy Diffusion, and Wave Heating for a Three-Dimensional Flow Induced by Breaking Gravity Waves
(American Meteorological Society, 2010)There are three distinct processes by which upward-propagating gravity waves influence the large-scale dynamics and energetics of the middle atmosphere: (i) nonlocalized transport of momentum through wave propagation in ... -
The Impact of ENSO on Wave Breaking and Southern Annular Mode Events
(American Meteorological Society, 2010)This study examines the relationship between intraseasonal southern annular mode (SAM) events and the El Niño?Southern Oscillation (ENSO) using daily 40-yr ECMWF Re-Analysis (ERA-40) data. The data coverage spans the years ... -
Dissipative Energization of Baroclinic Waves by Surface Ekman Pumping
(American Meteorological Society, 2010)A two-layer quasigeostrophic model is used to study the effect of lower boundary Ekman pumping on the energetics of baroclinic waves. Although the direct impact of the Ekman pumping is to damp the total eddy energy, either ... -
Overlap of Solar and Infrared Spectra and the Shortwave Radiative Effect of Methane
(American Meteorological Society, 2010)This paper focuses on two shortcomings of radiative transfer codes commonly used in climate models. The first aspect concerns the partitioning of solar versus infrared spectral energy. In most climate models, the solar ...