Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2861-2880 of 13215
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A Sensitivity Study of the Effect of Horizontal Photon Transport on the Radiative Forcing of Contrails
(American Meteorological Society, 2007)With the rapid growth in air travel, there is concern over the radiative impact of contrails and aircraft-induced cirrus on climate. Previous radiation calculations on contrails have almost all used the independent column ... -
Mesoscale Spectra of Mars’s Atmosphere Derived from MGS TES Infrared Radiances
(American Meteorological Society, 2007)Wavenumber spectra of the atmospheric potential energy of Mars at mesoscales (wavelengths of 64?957 km) were obtained as a function of latitude, season, and Martian year using infrared radiance data obtained by the Thermal ... -
Monsoon Dynamics with Interactive Forcing. Part I: Axisymmetric Studies
(American Meteorological Society, 2007)The applicability of axisymmetric theory of angular momentum conserving circulations to the large-scale steady monsoon is studied in a general circulation model with idealized representations of continental geometry and ... -
Weather Regime Prediction Using Statistical Learning
(American Meteorological Society, 2007)Two novel statistical methods are applied to the prediction of transitions between weather regimes. The methods are tested using a long, 6000-day simulation of a three-layer, quasigeostrophic (QG3) model on the sphere at ... -
Monsoon Dynamics with Interactive Forcing. Part II: Impact of Eddies and Asymmetric Geometries
(American Meteorological Society, 2007)The roles of eddies and forcing asymmetry in the dynamics of the large-scale monsoon circulation are investigated with a general circulation model. The net impact of eddies is found to be a slight weakening of the zonal ... -
Identification and ERA-15 Climatology of Potential Vorticity Streamers and Cutoffs near the Extratropical Tropopause
(American Meteorological Society, 2007)A novel approach is introduced to identify potential vorticity (PV) streamers and cutoffs as indicators of Rossby wave breaking near the extratropical tropopause and to compile climatologies of these features on different ... -
Modeling Backscatter Properties of Snowfall at Millimeter Wavelengths
(American Meteorological Society, 2007)Ground-based vertically pointing and airborne/spaceborne nadir-pointing millimeter-wavelength radars are being increasingly used worldwide. Though such radars are primarily designed for cloud remote sensing, they can also ... -
Momentum and Energy Transport by Gravity Waves in Stochastically Driven Stratified Flows. Part I: Radiation of Gravity Waves from a Shear Layer
(American Meteorological Society, 2007)In this paper, the emission of internal gravity waves from a local westerly shear layer is studied. Thermal and/or vorticity forcing of the shear layer with a wide range of frequencies and scales can lead to strong emission ... -
Relating Static Energy to Potential Temperature: A Caution
(American Meteorological Society, 2007)The relationship between dry static energy and potential temperature, cp? = cpT + gz, is exact for an adiabatic temperature profile, and extremely close to exact for an isothermal profile. Even though it is extremely ... -
Stratosphere–Troposphere Exchange and Its Relation to Potential Vorticity Streamers and Cutoffs near the Extratropical Tropopause
(American Meteorological Society, 2007)Two distinct dynamical processes near the dynamical tropopause (2-PVU surface) and their relation are discussed in this study: stratosphere?troposphere exchange (STE) and the formation of distinct potential vorticity (PV) ... -
Meridional Momentum Flux and Superrotation in the Multiscale IPESD MJO Model
(American Meteorological Society, 2007)The derivation of the meridional momentum flux arising from a multiscale horizontal velocity field in the intraseasonal, planetary, equatorial synoptic-scale dynamics (IPESD) multiscale models of the equatorial troposphere ... -
Improved Subfilter-Scale Models from the HATS Field Data
(American Meteorological Society, 2007)An earlier paper proposed simple rate-equation models for subfilter-scale (SFS) scalar flux and deviatoric stress in the terra incognita?that is, in numerical modeling applications where the filter (grid-mesh) scale is of ... -
Modal and Nonmodal Symmetric Perturbations. Part I: Completeness of Normal Modes and Constructions of Nonmodal Solutions
(American Meteorological Society, 2007)It is shown that the classic normal modes for symmetric perturbations in a layer of vertically sheared basic flow can be classified into three types: paired growing and decaying modes, paired slowly propagating modes, and ... -
The Convective Cold Top and Quasi Equilibrium
(American Meteorological Society, 2007)To investigate dominant vertical structures of observed temperature perturbations, and to test the temperature implications of the convective quasi-equilibrium hypothesis, the relationship of the tropical temperature profile ... -
Refinements to Ice Particle Mass Dimensional and Terminal Velocity Relationships for Ice Clouds. Part II: Evaluation and Parameterizations of Ensemble Ice Particle Sedimentation Velocities
(American Meteorological Society, 2007)This two-part study addresses the development of reliable estimates of the mass and fall speed of single ice particles and ensembles. Part I of the study reports temperature-dependent coefficients for the mass-dimensional ... -
Tropical Cyclogenesis within an Equatorial Rossby Wave Packet
(American Meteorological Society, 2007)A packet of equatorial Rossby (ER) waves that lasted 2.5 months is identified in the lower troposphere of the northwest Pacific. Waves within the packet had a period of 22 days, a wavelength of 3600 km, a westward phase ... -
On the Forcing of Inertia–Gravity Waves by Synoptic-Scale Flows
(American Meteorological Society, 2007)Studies on the spontaneous emission of gravity waves from jets, both observational and numerical, have emphasized that excitation of gravity waves occurred preferentially near regions of imbalance. Yet a quantitative ... -
Mixing Processes in a Nocturnal Low-Level Jet: An LES Study
(American Meteorological Society, 2007)A steady-state low-level jet observed in the Stable Atmospheric Boundary Layer Experiment in Spain-1998 (SABLES-98) campaign is simulated using a large-eddy simulation model. The radiation is taken into account since its ... -
Roll Circulations in the Convective Region of a Simulated Squall Line
(American Meteorological Society, 2007)In high-resolution numerical simulations (using horizontal grid spacing less than ?1 km), the convective region of squall lines will sometimes overturn as quasi-horizontal convective rolls. The authors study one case in ... -
Mesoscale Convective Vortex Formation in a Weakly Sheared Moist Neutral Environment
(American Meteorological Society, 2007)Idealized simulations of a diabatic Rossby vortex (DRV) in an initially moist neutral baroclinic environment are performed using the fifth-generation National Center for Atmospheric Research?Pennsylvania State University ...