Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1901-1920 of 13215
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Environmental Helicity and Its Effects on Development and Intensification of Tropical Cyclones
(American Meteorological Society, 2014)uch attention has been given to the impact of environmental wind shear in the 850?200-hPa layer on tropical cyclones (TCs). However, even with the same magnitude of shear, helicity in this layer can vary significantly. A ... -
A Semihydrostatic Theory of Gravity-Dominated Compressible Flow
(American Meteorological Society, 2014)rom Hamilton?s least-action principle, compressible equations of motion with density diagnosed from potential temperature through hydrostatic balance are derived. Slaving density to potential temperature suppresses the ... -
Does Wind Shear Cause Hydrometeor Size Sorting?
(American Meteorological Society, 2014)everal recent studies have implicated vertical wind shear in producing steady-state size sorting of a distribution of hydrometeors falling at their terminal velocity, which varies as a function of hydrometeor diameter. In ... -
A Study on the Scale Dependence of the Predictability of Precipitation Patterns
(American Meteorological Society, 2014)methodology is proposed to investigate the scale dependence of the predictability of precipitation patterns at the mesoscale. By applying it to two or more precipitation fields, either modeled or observed, a decorrelation ... -
Parameterization of Cloud Microphysics Based on the Prediction of Bulk Ice Particle Properties. Part II: Case Study Comparisons with Observations and Other Schemes
(American Meteorological Society, 2014)new microphysics scheme has been developed based on the prediction of bulk particle properties for a single ice-phase category, in contrast to the traditional approach of separating ice into various predefined species ... -
The Sensitivity of a Numerically Simulated Idealized Squall Line to the Vertical Distribution of Aerosols
(American Meteorological Society, 2014)hanges in the aerosol number concentration are reflected by changes in raindrop size and number concentration that ultimately affect the strength of cold pools via evaporation. Therefore, aerosol perturbations can potentially ... -
On the Sensitivity of Zonal-Index Persistence to Friction
(American Meteorological Society, 2014)riction is an important parameter in atmospheric modeling that may affect internal variability in a number of ways. It directly damps the annular-mode variability, but it also helps to maintain it through baroclinic ... -
An Exploration of Multivariate Fluctuation Dissipation Operators and Their Response to Sea Surface Temperature Perturbations
(American Meteorological Society, 2014)he fluctuation?dissipation theorem (FDT) has been proposed as a method of calculating the mean response of the atmosphere to small external perturbations. This paper explores the application of the theory under time and ... -
Dynamical and Microphysical Evolution during Mixed-Phase Cloud Glaciation Simulated Using the Bulk Adaptive Habit Prediction Model
(American Meteorological Society, 2014)bulk microphysics scheme predicting ice particle habit evolution has been implemented in the Weather Research and Forecasting Model. Large-eddy simulations are analyzed to study the effects of ice habit and number concentration ... -
A Simple Analytical Model of the Nocturnal Low-Level Jet over the Great Plains of the United States
(American Meteorological Society, 2014)simple analytical model including both diurnal thermal forcing over sloping terrain (the ?Holton? mechanism) and diurnally varying boundary layer friction (the ?Blackadar? mechanism) is developed to account for the observed ... -
Role of Cross-Equatorial Waves in Maintaining Long Periods of Low Convective Activity over Southern Africa
(American Meteorological Society, 2014)eriods of low convective activity over southern Africa during the peak rainy season from December to February are known to be due to the northeastward displacement of the tropical temperate trough (TTT) systems from the ... -
Parameterization of Cloud Microphysics Based on the Prediction of Bulk Ice Particle Properties. Part I: Scheme Description and Idealized Tests
(American Meteorological Society, 2014)method for the parameterization of ice-phase microphysics is proposed and used to develop a new bulk microphysics scheme. All ice-phase particles are represented by several physical properties that evolve freely in time ... -
Identifying a Barotropic Growth Mechanism in East Pacific Tropical Cyclogenesis Using Adjoint-Derived Sensitivity Gradients
(American Meteorological Society, 2014)he eastern Pacific tropical cyclone basin is typified by a low-level westerly jet with the main development region residing on its northern, cyclonic-shear side. The persistent meridional shear of the zonal flow associated ... -
Spiral Rainbands in a Numerical Simulation of Hurricane Bill (2009). Part I: Structures and Comparisons to Observations
(American Meteorological Society, 2014)his study examines spiral rainbands in a numerical simulation of Hurricane Bill (2009). This paper, the first part of the study, evaluates the structures of spiral rainbands and compares them to previous observations. Four ... -
On the Seasonal and Synoptic Time-Scale Variability of the North Atlantic Trade Wind Region and Its Low-Level Clouds
(American Meteorological Society, 2014)he seasonality in large-scale meteorology and low-level cloud amount (CClow) is explored for a 5° ? 5° area in the North Atlantic trades, using 12 years of ERA-Interim and MODIS data, supported by 2 years of Barbados Cloud ... -
Spiral Rainbands in a Numerical Simulation of Hurricane Bill (2009). Part II: Propagation of Inner Rainbands
(American Meteorological Society, 2014)his is the second part of a study that examines spiral rainbands in a numerical simulation of Hurricane Bill (2009). This paper evaluates whether the propagation of inner rainbands in the Hurricane Bill simulation is ... -
Sensitivity of Tropical Cyclone Feedback on the Intensity of the Western Pacific Subtropical High to Microphysics Schemes
(American Meteorological Society, 2014)he Advanced Research version of Weather Research and Forecasting (WRF-ARW) Model is used to examine the sensitivity of a simulated tropical cyclone (TC) track and the associated intensity of the western Pacific subtropical ... -
A Search for Chaotic Behavior in Stratospheric Variability: Comparison between the Northern and Southern Hemispheres
(American Meteorological Society, 2014)outhern Hemisphere (SH) stratospheric variability is investigated with respect to chaotic behavior using time series from three different variables extracted from four different reanalysis products. The results are compared ... -
Moist Static Energy Budget of the MJO during DYNAMO
(American Meteorological Society, 2014)he authors analyze the column-integrated moist static energy budget over the region of the tropical Indian Ocean covered by the sounding array during the Cooperative Indian Ocean Experiment on Intraseasonal Variability in ... -
Effects of Vertical Wind Shear on Inner-Core Thermodynamics of an Idealized Simulated Tropical Cyclone
(American Meteorological Society, 2014)suite of idealized simulations of tropical cyclones (TCs) with weak to strong vertical wind shear (VWS) imposed during the mature stage was employed to examine the effects of VWS on the inner-core thermodynamics and intensity ...