Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4161-4180 of 13215
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The Dry-Entropy Budget of a Moist Atmosphere
(American Meteorological Society, 2008)The entropy budget has been a popular starting point for theories of the work, or dissipation, performed by moist atmospheres. For a dry atmosphere, the entropy budget provides a theory for the dissipation in terms of the ... -
Sigma-Point Kalman Filter Data Assimilation Methods for Strongly Nonlinear Systems
(American Meteorological Society, 2009)Performance of an advanced, derivativeless, sigma-point Kalman filter (SPKF) data assimilation scheme in a strongly nonlinear dynamical model is investigated. The SPKF data assimilation scheme is compared against standard ... -
Explorations of Atmosphere–Ocean–Ice Climates on an Aquaplanet and Their Meridional Energy Transports
(American Meteorological Society, 2009)The degree to which total meridional heat transport is sensitive to the details of its atmospheric and oceanic components is explored. A coupled atmosphere, ocean, and sea ice model of an aquaplanet is employed to simulate ... -
A Spectral Stochastic Kinetic Energy Backscatter Scheme and Its Impact on Flow-Dependent Predictability in the ECMWF Ensemble Prediction System
(American Meteorological Society, 2009)Understanding model error in state-of-the-art numerical weather prediction models and representing its impact on flow-dependent predictability remains a complex and mostly unsolved problem. Here, a spectral stochastic ... -
Some Space–Time Spectral Analyses of Tropical Convection and Planetary-Scale Waves
(American Meteorological Society, 2008)Three aspects of space?time spectral analysis are explored for diagnosis of the organization of tropical convection by the Madden?Julian oscillation (MJO) and other equatorial wave modes: 1) definition of the background ... -
The Storm-Track Response to Idealized SST Perturbations in an Aquaplanet GCM
(American Meteorological Society, 2008)The tropospheric response to midlatitude SST anomalies has been investigated through a series of aquaplanet simulations using a high-resolution version of the Hadley Centre atmosphere model (HadAM3) under perpetual equinox ... -
Asymmetry of Daily Temperature Records
(American Meteorological Society, 2008)The authors study the NCEP?NCAR reanalysis temperature records and find that surface daily mean temperature cools rapidly and warms gradually at the midlatitudes (around 40°N and 40°S). This ?asymmetry? is partially related ... -
Interannual Variability and Trends of Extratropical Ozone. Part I: Northern Hemisphere
(American Meteorological Society, 2008)The authors apply principal component analysis (PCA) to the extratropical total column ozone from the combined merged ozone data product and the European Centre for Medium-Range Weather Forecasts assimilated ozone from ... -
Testing Lagrangian Theories of Internal Wave Spectra. Part II: Varying the Number of Waves
(American Meteorological Society, 2009)It has been proposed by Allen and Joseph, Hines, and Chunchuzov that the kinematic advection produced by superpositions of sinusoidal Lagrangian gravity waves confined to lower vertical wavenumbers m provides an explanation ... -
Testing Lagrangian Theories of Internal Wave Spectra. Part I: Varying the Amplitude and Wavenumbers
(American Meteorological Society, 2009)A growing body of literature has been built on the premise that kinematic advection produced by linear superpositions of sinusoidal Lagrangian gravity waves confined to lower vertical wavenumbers can provide an explanation ... -
Surface Heterogeneity Effects on Regional-Scale Fluxes in Stable Boundary Layers: Surface Temperature Transitions
(American Meteorological Society, 2009)Large-eddy simulation, with recently developed dynamic subgrid-scale models, is used to study the effect of heterogeneous surface temperature distributions on regional-scale turbulent fluxes in the stable boundary layer ... -
A Preferred Scale for Warm-Core Instability in a Nonconvective Moist Basic State
(American Meteorological Society, 2008)The existence, scale, and growth rates of subsynoptic-scale warm-core circulations are investigated with a simple parameterization for latent heat release in a nonconvective basic state using a linear two-layer shallow-water ... -
Sensitivity of a Cloud-Resolving Model to Bulk and Explicit Bin Microphysical Schemes. Part I: Comparisons
(American Meteorological Society, 2009)A two-dimensional cloud-resolving model is used to study the sensitivities of two microphysical schemes, a bulk scheme and an explicit spectral bin scheme, in simulating a midlatitude summertime squall line [Preliminary ... -
Quasigeostrophic Turbulence with Explicit Surface Dynamics: Application to the Atmospheric Energy Spectrum
(American Meteorological Society, 2009)The horizontal wavenumber spectra of wind and temperature near the tropopause have a steep ?3 slope at synoptic scales and a shallower ?5/3 slope at mesoscales, with a transition between the two regimes at a wavelength of ... -
Moist Convection and the Thermal Stratification of the Extratropical Troposphere
(American Meteorological Society, 2008)Simulations with an aquaplanet general circulation model show that sensible and latent heat transport by large-scale eddies influences the extratropical thermal stratification over a wide range of climates, even in relatively ... -
Sensitivity of a Cloud-Resolving Model to Bulk and Explicit Bin Microphysical Schemes. Part II: Cloud Microphysics and Storm Dynamics Interactions
(American Meteorological Society, 2009)Part I of this paper compares two simulations, one using a bulk and the other a detailed bin microphysical scheme, of a long-lasting, continental mesoscale convective system with leading convection and trailing stratiform ... -
A Dual Mass Flux Framework for Boundary Layer Convection. Part II: Clouds
(American Meteorological Society, 2009)This paper presents the extension of the eddy diffusivity mass flux (EDMF) framework for turbulent transport into the statistical modeling of boundary layer clouds. The advection?diffusion decomposition that defines EDMF ... -
Fast Lidar and Radar Multiple-Scattering Models. Part I: Small-Angle Scattering Using the Photon Variance–Covariance Method
(American Meteorological Society, 2008)A fast, approximate method is described for the calculation of the intensity of multiply scattered lidar returns from clouds. At each range gate it characterizes the outgoing photon distribution by its spatial variance, ... -
Sensitivity of Global Mixing and Fluxes to Isolated Transport Barriers
(American Meteorological Society, 2008)Effects of isolated transport barriers on the global mixing and fluxes of a tracer are investigated, where a barrier is defined as a local minimum in effective diffusivity. An idealized 1D model with a prescribed diffusivity ... -
Fast Lidar and Radar Multiple-Scattering Models. Part II: Wide-Angle Scattering Using the Time-Dependent Two-Stream Approximation
(American Meteorological Society, 2008)Spaceborne lidar returns from liquid water clouds contain significant contributions from photons that have experienced many wide-angle multiple-scattering events, resulting in returns appearing to originate from far beyond ...