Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1881-1900 of 13215
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A New Look at Deformation as a Diagnostic for Large-Scale Flow
(American Meteorological Society, 2014)eformation plays a key role in atmospheric dynamics because it provides a dynamical measure of the interaction between different scales, such as in frontogenesis. A climatology of deformation constructed from Interim ECMWF ... -
Development of North Atlantic Tropical Disturbances near Upper-Level Potential Vorticity Streamers
(American Meteorological Society, 2014)ropical cyclone (TC) development near upper-level potential vorticity (PV) streamers in the North Atlantic is studied from synoptic climatology, composite, and case study perspectives. Midlatitude anticyclonic wave breaking ... -
Stochastic Parameterization of Convective Area Fractions with a Multicloud Model Inferred from Observational Data
(American Meteorological Society, 2014)bservational data of rainfall from a rain radar in Darwin, Australia, are combined with data defining the large-scale dynamic and thermodynamic state of the atmosphere around Darwin to develop a multicloud model based on ... -
Relationship between Warm Airmass Transport into the Upper Polar Atmosphere and Cold Air Outbreaks in Winter
(American Meteorological Society, 2014)his study investigates dominant patterns of daily surface air temperature anomalies in winter (November?February) and their relationship with the meridional mass circulation variability using the daily Interim ECMWF ... -
Baroclinic and Barotropic Annular Variability in the Northern Hemisphere
(American Meteorological Society, 2014)arge-scale variability in the Northern Hemisphere (NH) circulation can be viewed in the context of three primary types of structures: 1) teleconnection patterns, 2) a barotropic annular mode, and 3) a baroclinic annular ... -
Make It a Double? Sobering Results from Simulations Using Single-Moment Microphysics Schemes
(American Meteorological Society, 2014)ingle-moment microphysics schemes have long enjoyed popularity for their simplicity and efficiency. However, in this article it is argued through theoretical considerations, idealized thunderstorm simulations, and ... -
Structure and Statistical Analysis of the Microphysical Properties of Generating Cells in the Comma Head Region of Continental Winter Cyclones
(American Meteorological Society, 2014)his paper presents analyses of the microphysical structure of cloud-top convective generating cells at temperatures between ?10° and ?55°C across the comma head of 11 continental cyclones, using data collected by the W-band ... -
The Sensitivity of Simulated Shallow Cumulus Convection and Cold Pools to Microphysics
(American Meteorological Society, 2015)he sensitivity of nested WRF simulations of precipitating shallow marine cumuli and cold pools to microphysical parameterization is examined. The simulations differ only in their use of two widely used double-moment rain ... -
On the Validity of the β-Plane Approximation in the Dynamics and the Chaotic Advection of a Point Vortex Pair Model on a Rotating Sphere
(American Meteorological Society, 2014)he dynamics of modulated point vortex pairs is investigated on a rotating sphere, where modulation is chosen to reflect the conservation of angular momentum (potential vorticity). In this setting the authors point out a ... -
A Study on the Asymmetric Rapid Intensification of Hurricane Earl (2010) Using the HWRF System
(American Meteorological Society, 2014)n this study, the results of a forecast from the operational Hurricane Weather Research and Forecast (HWRF) system for Hurricane Earl (2010) are verified against observations and analyzed to understand the asymmetric rapid ... -
A Dynamically Constrained Method for Determining the Vortex Centers of Tropical Cyclones Predicted by High-Resolution Models
(American Meteorological Society, 2014)his paper proposes a new method to properly define and accurately determine the vortex center of a model-predicted tropical cyclone (TC) from a dynamic perspective. Ideally, a dynamically determined TC vortex center should ... -
Cloud Conditions Favoring Secondary Ice Particle Production in Tropical Maritime Convection
(American Meteorological Society, 2014)rogress in understanding the formation of ice in lower-tropospheric clouds is slowed by the difficulties in characterizing the many complex interactions that lead to ice initiation and to the dynamic, non-steady-state ... -
A Parameterization of Sticking Efficiency for Collisions of Snow and Graupel with Ice Crystals: Theory and Comparison with Observations
(American Meteorological Society, 2014)new parameterization of sticking efficiency for aggregation of ice crystals onto snow and graupel is presented. This parameter plays a crucial role for the formation of ice precipitation and for electrification processes. ... -
Initiating Moist Convection in an Inhomogeneous Layer by Uniform Ascent
(American Meteorological Society, 2014)sing aircraft data from the recent Dominica Experiment (DOMEX) project in Dominica, the authors evaluate a modified version of Woodcock?s theory of moist convective initiation. Upstream of Dominica, anticorrelated fluctuations ... -
Predictability of Wintertime Stratospheric Circulation Examined Using a Nonstationary Fluctuation–Dissipation Relation
(American Meteorological Society, 2014)he dynamics and predictability of stratospheric low-frequency variability in the Northern Hemisphere winter are examined using a two-dimensional (2D) phase space spanned by the leading empirical orthogonal functions of the ... -
Three-Dimensional Structure and Evolution of the Vertical Velocity and Divergence Fields in the MJO
(American Meteorological Society, 2014)he features in the planetary-scale wind field that shape the MJO-related vertical velocity field are examined using the linear analysis protocol based on the daily global velocity potential field described in a companion ... -
Large-Eddy Simulation of Marine Atmospheric Boundary Layers above a Spectrum of Moving Waves
(American Meteorological Society, 2014)omentum and scalar transport in the marine atmospheric boundary layer (MABL) is driven by a turbulent mix of winds, buoyancy, and surface gravity waves. To investigate the interaction between these processes, a large-eddy ... -
On the Warm Core of a Tropical Cyclone Formed near the Tropopause
(American Meteorological Society, 2014)n the basis of numerical results of a three-dimensional model diagnosed using balance dynamics, a mechanism by which the upper-level warm core of tropical cyclones (TCs) forms is proposed. The numerical results reveal that ... -
Decadal Rainfall Dipole Oscillation over Southern Africa Modulated by Variation of Austral Summer Land–Sea Contrast along the East Coast of Africa
(American Meteorological Society, 2015)rainfall dipole mode characterized by negative correlation between subtropical southern Africa and equatorial eastern Africa is identified in instrumental observation data in the recent 100 years. The dipole mode shows a ... -
The Life Cycle of the North Atlantic Storm Track
(American Meteorological Society, 2014)he North Atlantic eddy-driven jet exhibits latitudinal variability with evidence of three preferred latitudinal locations: south, middle, and north. Here the authors examine the drivers of this variability and the variability ...