Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1001-1020 of 13215
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Nonlinear Formation of the Three-Dimensional Spectrum of Mesoscale Wind Velocity and Temperature Fluctuations in a Stably Stratified Atmosphere
(American Meteorological Society, 2018)AbstractThe theory of formation of the space?time spectrum of the mesoscale fluctuations in the horizontal wind velocity and vertical displacements (or relative temperature fluctuations) in a stably stratified atmosphere ... -
An Evaluation of LES Turbulence Models for Scalar Mixing in the Stratocumulus-Capped Boundary Layer
(American Meteorological Society, 2018)AbstractThe stratocumulus cloud?capped boundary layer under a sharp inversion is a challenging regime for large-eddy simulation (LES). Here, data from the first research flight of the Second Dynamics and Chemistry of the ... -
Mesoscale Horizontal Kinetic Energy Spectra of a Tropical Cyclone
(American Meteorological Society, 2018)AbstractA high-resolution cloud-permitting simulation with the Weather Research and Forecasting (WRF) Model is performed to investigate the mesoscale horizontal kinetic energy (HKE) spectra of a tropical cyclone (TC). The ... -
The Impact of Mountain Waves on an Idealized Baroclinically Unstable Large-Scale Flow
(American Meteorological Society, 2018)AbstractThe feedback of mountain waves and low-level blocking on an idealized baroclinically unstable wave passing over an isolated ridge is examined through numerical simulation. Theoretical analysis implies that the ... -
The Finite-Amplitude Evolution of Mixed Kelvin–Rossby Wave Instability and Equatorial Superrotation in a Shallow-Water Model and an Idealized GCM
(American Meteorological Society, 2018)AbstractAn instability involving the resonant interaction of a Rossby wave and a Kelvin wave has been proposed to drive equatorial superrotation in planetary atmospheres with a substantially smaller radius or a smaller ... -
Dynamical Insights into Extreme Short-Term Precipitation Associated with Supercells and Mesovortices
(American Meteorological Society, 2018)AbstractIn some prominent extreme precipitation and flash flood events, radar and rain gauge observations have suggested that the heaviest short-term rainfall accumulations (up to 177 mm h?1) were associated with supercells ... -
Orographic Precipitation Response to Microphysical Parameter Perturbations for Idealized Moist Nearly Neutral Flow
(American Meteorological Society, 2018)AbstractThis study explores the sensitivity of clouds and precipitation to microphysical parameter perturbations using idealized simulations of moist, nearly neutral flow over a bell-shaped mountain. Numerous parameters ... -
Evolution and Stability of Two-Dimensional Anelastic Internal Gravity Wave Packets
(American Meteorological Society, 2018)AbstractThe weakly nonlinear evolution, stability, and overturning of horizontally and vertically localized internal gravity wave packets is examined for a nonrotating, anelastic atmosphere that is stationary in the absence ... -
A Gravity Wave Drag Matrix for Complex Terrain
(American Meteorological Society, 2018)AbstractWe propose a simplified scheme to predict mountain wave drag over complex terrain using only the regional-average low-level wind components U and V. The scheme is tuned and tested on data from the South Island of ... -
Evaluation of a Time-Dependent Model for the Intensification of Tropical Cyclones
(American Meteorological Society, 2018)AbstractAxisymmetric and three-dimensional simulations are used to evaluate the theory of tropical cyclone (TC) intensification proposed by K. A. Emanuel, which is based on gradient wind balance and moist-neutral ascent ... -
A Parameterization Scheme for Air–Sea Surface Interface Fluxes: Design and Stand-Alone Experiments
(American Meteorological Society, 2018)AbstractObservations show that sea surface temperature (SST) can vary up to several degrees in a day and sea surface energy fluxes up to a few hundreds of watts per square meter. For synoptic- and subsynoptic-scale atmospheric ... -
Role of Finite-Amplitude Rossby Waves and Nonconservative Processes in Downward Migration of Extratropical Flow Anomalies
(American Meteorological Society, 2018)AbstractThere is growing evidence that stratospheric variability exerts a noticeable imprint on tropospheric weather and climate. Despite clear evidence of these impacts, the principal mechanism whereby stratospheric ... -
Observing the Tropical Atmosphere in Moisture Space
(American Meteorological Society, 2018)AbstractMeasurements from the Barbados Cloud Observatory are analyzed to identify the processes influencing the distribution of moist static energy and the large-scale organization of tropical convection. Five years of ... -
Convective Organization in Evolving Large-Scale Forcing Represented by a Highly Truncated Numerical Archetype
(American Meteorological Society, 2018)AbstractConsidered as a prognostic generalization of mass-flux-based convection parameterization, the highly truncated nonhydrostatic anelastic model with segmentally constant approximation (NAM?SCA) is tested with ... -
Comments on “The Gulf Stream Convergence Zone in the Time-Mean Winds”
(American Meteorological Society, 2018)AbstractIn a recent study, O?Neill et al. analyzed the divergence of surface winds above the northwest Atlantic. In the time mean, a band of convergence is found, overlying the southern flank of the Gulf Stream. To quantify ... -
Buoyant Motion of a Turbulent Thermal
(American Meteorological Society, 2018)AbstractBy introducing an equivalence between magnetostatics and the equations governing buoyant motion, we derive analytical expressions for the acceleration of isolated density anomalies (thermals). In particular, we ... -
On the Coupling between Barotropic and Baroclinic Modes of Extratropical Atmospheric Variability
(American Meteorological Society, 2018)Abstract The baroclinic and barotropic components of atmospheric dynamics are usually viewed as interlinked through the baroclinic life cycle, with baroclinic growth of eddies connected to heat fluxes, barotropic decay ... -
Ground-Truth Model Evaluation of Subgrid Orographic Base-Flux Parameterization
(American Meteorological Society, 2018)AbstractHigh-resolution simulation can be a powerful means of evaluating and tuning orographic drag schemes, but connecting the parameterized drag, which is a local forcing, with the model drag, which is fundamentally ... -
A Phenomenological Paradigm for Midtropospheric Cyclogenesis in the Indian Summer Monsoon
(American Meteorological Society, 2018)AbstractMidtropospheric cyclones (MTCs) are a distinct class of synoptic disturbances, characterized by quasi-stationary cyclonic circulation in midtropospheric levels, which often produce heavy rainfall and floods over ... -
On the Characteristics of Linear-Phase Roll Vortices under a Moving Hurricane Boundary Layer
(American Meteorological Society, 2018)AbstractPrevious theoretical and numerical studies only focused on the formation of roll vortices (rolls) under a stationary and axisymmetric hurricane. The effect of the asymmetric wind structure induced by the storm ...