Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2401-2420 of 13215
-
Lower-Stratospheric Radiative Damping and Polar-Night Jet Oscillation Events
(American Meteorological Society, 2012)he effect of stratospheric radiative damping time scales on stratospheric variability and on stratosphere?troposphere coupling is investigated in a simplified global circulation model by modifying the vertical profile of ... -
Energy Dispersion in African Easterly Waves
(American Meteorological Society, 2012)he existence of an upstream (eastward) group velocity for African easterly waves (AEWs) is shown based on single-point lag regressions using gridded reanalysis data from 1990 to 2010. The eastward energy dispersion is ... -
Impact of Asymmetric Dynamical Processes on the Structure and Intensity Change of Two-Dimensional Hurricane-Like Annular Vortices
(American Meteorological Society, 2012)n this study, a simple two-dimensional (2D) unforced barotropic model is used to study the asymmetric dynamics of the hurricane inner-core region and to assess their impact on the structure and intensity change. Two sets ... -
Moisture Modes and the Eastward Propagation of the MJO
(American Meteorological Society, 2012)he authors discuss modifications to a simple linear model of intraseasonal moisture modes. Wind?evaporation feedbacks were shown in an earlier study to induce westward propagation in an eastward mean low-level flow in this ... -
The Variability and Predictability of Axisymmetric Hurricanes in Statistical Equilibrium
(American Meteorological Society, 2012)he variability and predictability of axisymmetric hurricanes are determined from a 500-day numerical simulation of a tropical cyclone in statistical equilibrium. By design, the solution is independent of the initial ... -
A Cumulus Cloud Microphysics Parameterization for Cloud-Resolving Models
(American Meteorological Society, 2012)microphysical parameterization for shallow cumulus and boundary layer stratocumulus clouds has been developed. Similar to the Khairoutdinov and Kogan parameterization for stratocumulus clouds, the new parameterization is ... -
A Spatial Filter Approach to Evaluating the Role of Convection on the Evolution of a Mesoscale Vortex
(American Meteorological Society, 2013)new spatial filter is proposed that exploits a spectral gap in power between the convective scale and the system (?vortex?) scale during tropical cyclone (TC) genesis simulations. Using this spatial separation, this study ... -
Modulation of the Diurnal Cycle of Warm-Season Precipitation by Short-Wave Troughs
(American Meteorological Society, 2012)raveling deep tropospheric disturbances of wavelengths ~1500 km (short waves) have long been known to play an important role in the initiation and maintenance of warm-season convection. To date, relatively few studies have ... -
A New Mechanism of Droplet Size Distribution Broadening during Diffusional Growth
(American Meteorological Society, 2013)new mechanism has been developed for size distribution broadening toward large droplet sizes. This mechanism may explain the rapid formation of large cloud droplets, which may subsequently trigger precipitation formation ... -
A Modeling Study of Stratospheric Waves over the Southern Andes and Drake Passage
(American Meteorological Society, 2012)arge-amplitude stratospheric gravity waves over the southern Andes and Drake Passage, as observed by the Atmospheric Infrared Sounder (AIRS) on 8?9 August 2010, are modeled and studied using a deep (0?70 km) version of the ... -
Role of Interactions between Aerosol Radiative Effect, Dynamics, and Cloud Microphysics on Transitions of Monsoon Intraseasonal Oscillations
(American Meteorological Society, 2013)xtended-range prediction of monsoon intraseasonal oscillations (MISOs), crucial for agriculture and water management, is limited by their event-to-event variability. Here, the authors propose a hypothesis supported by a ... -
A Numerical Study of the Impacts of Dry Air on Tropical Cyclone Formation: A Development Case and a Nondevelopment Case
(American Meteorological Society, 2012)he impacts of dry air on tropical cyclone formation are examined in the numerical model simulations of ex-Gaston (2010) and pre-Fay (2008). The former, a remnant low downgraded from a short-lived tropical cyclone, can be ... -
On the Geographic Asymmetry of Typhoon Translation Speed across the Mountainous Island of Taiwan
(American Meteorological Society, 2012)his paper examines the effect of topographically phase-locked convection on the motion of typhoons across the island of Taiwan. Data for 84 typhoons that reached Taiwan?s eastern coast from 1960 to 2010 are analyzed, with ... -
Postprocessing Model-Predicted Rainfall Fields in the Spectral Domain Using Phase Information from Radar Observations
(American Meteorological Society, 2012)n an attempt to combine the short-term skill of radar nowcasting and the long-term skill of numerical models, successive 15-min rainfall accumulations obtained from the U.S. national radar composites and predicted by the ... -
The Role of High-Latitude Waves in the Intraseasonal to Seasonal Variability of Tropical Upwelling in the Brewer–Dobson Circulation
(American Meteorological Society, 2013)he forcing of tropical upwelling in the Brewer?Dobson circulation (BDC) on intraseasonal to seasonal time scales is investigated in integrations of an idealized general circulation model, ECMWF Interim Re-Analysis, and ... -
The Properties and Formation of Cirrus Clouds over the Tibetan Plateau Based on Summertime Lidar Measurements
(American Meteorological Society, 2012)s part of the Tibet Ozone, Aerosol and Radiation (TOAR) project, a micropulse lidar was operated in Naqu (31.5°N, 92.1°E; 4508 m MSL) on the Tibetan Plateau to observe cirrus clouds continuously from 19 July to 26 August ... -
Secondary Eyewall Formation and Eyewall Replacement Cycles in a Simulated Hurricane: Effect of the Net Radial Force in the Hurricane Boundary Layer
(American Meteorological Society, 2012)ultiple secondary eyewall formations (SEFs) and eyewall replacement cycles (ERCs) are simulated with the fifth-generation Pennsylvania State University (PSU)?National Center for Atmospheric Research (NCAR) Mesoscale Model ... -
Sensitivity of Warm-Frontal Processes to Cloud-Nucleating Aerosol Concentrations
(American Meteorological Society, 2013)n extratropical cyclone that crossed the United States on 9?11 April 2009 was successfully simulated at high resolution (3-km horizontal grid spacing) using the Colorado State University Regional Atmospheric Modeling System. ... -
Turbulence and Vertical Fluxes in the Stable Atmospheric Boundary Layer. Part II: A Novel Mixing-Length Model
(American Meteorological Society, 2013)his is the second part of a study about turbulence and vertical fluxes in the stable atmospheric boundary layer. Based on a suite of large-eddy simulations in Part I where the effects of stability on the turbulent structures ... -
On the Signatures of Equatorial and Extratropical Wave Forcing in Tropical Tropopause Layer Temperatures
(American Meteorological Society, 2012)emperatures in the tropical tropopause layer (TTL) play an important role in stratosphere?troposphere exchange and in the formation and maintenance of thin cirrus clouds. Many previous studies have examined the contributions ...