Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1101-1120 of 13215
-
A Two-Dimensional Dynamical Model for the Subseasonal Variability of the Asian Monsoon Anticyclone
(American Meteorological Society, 2018)AbstractThe Asian monsoon anticyclone, which develops in the upper troposphere and lower stratosphere during boreal summer, exhibits significant subseasonal variability with a characteristic spatial structure. The dynamics ... -
Quantifying Isentropic Mixing Linked to Rossby Wave Breaking in a Modified Lagrangian Coordinate
(American Meteorological Society, 2018)AbstractIsentropic mixing is an important process for the distribution of chemical constituents in the mid- to high latitudes. A modified Lagrangian framework is applied to quantify the mixing associated with two distinct ... -
Baroclinic Adjustment and Dissipative Control of Storm Tracks
(American Meteorological Society, 2018)AbstractThe steady-state response of a midlatitude storm track to large-scale extratropical thermal forcing and eddy friction is investigated in a dry general circulation model with a zonally symmetric forcing. A two-way ... -
Reexamining the Gradient and Countergradient Representation of the Local and Nonlocal Heat Fluxes in the Convective Boundary Layer
(American Meteorological Society, 2018)AbstractTurbulent mixing in the daytime convective boundary layer (CBL) is carried out by organized nonlocal updrafts and smaller local eddies. In the upper mixed layer of the CBL, heat fluxes associated with nonlocal ... -
Sensitivity of Tropical Cyclone Track to the Vertical Structure of a Nearby Monsoon Gyre
(American Meteorological Society, 2018)AbstractThe impact of different vertical structures of a nearby monsoon gyre (MG) on a tropical cyclone (TC) track is investigated using idealized numerical simulations. In the experiment with a relatively deeper MG, the ... -
Diurnal Evolution and Structure of Long-Lived Mesoscale Convective Vortices along the Mei-Yu Front over the East China Plains
(American Meteorological Society, 2018)AbstractThe structure and diurnal evolution of long-lived, eastward-propagating mesoscale convective vortices (MCVs) along typical summertime mei-yu fronts over the east China plains are investigated through composite ... -
Relationships between Electrification and Storm-Scale Properties Based on Idealized Simulations of an Intensifying Hurricane-Like Vortex
(American Meteorological Society, 2017)AbstractThis study investigates relationships between storm-scale properties and the electrification and lightning of two simulations of an intensifying idealized tropical cyclone (TC) using the cloud-resolving Collaborative ... -
Extratropical Response to the MJO: Nonlinearity and Sensitivity to the Initial State
(American Meteorological Society, 2017)AbstractPrevious studies have shown that the Madden?Julian oscillation (MJO) has a global impact that may provide an important source of skill for subseasonal predictions. The extratropical response was found to be the ... -
The Response of an Idealized Atmosphere to Localized Tropical Heating: Superrotation and the Breakdown of Linear Theory
(American Meteorological Society, 2017)AbstractAn equatorial heat source mimicking the strong diabatic heating above the west Pacific is added to an idealized, dry general circulation model. For small (<0.5 K day?1) heating rates the responses closely match the ... -
How Well Can We Represent the Spectrum of Convective Clouds in a Climate Model? Comparisons between Internal Parameterization Variables and Radar Observations
(American Meteorological Society, 2018)AbstractCurrent climate models cannot resolve individual convective clouds, and hence parameterizations are needed. The primary goal of convective parameterization is to represent the bulk impact of convection on the ... -
Secondary Ice Production by Fragmentation of Freezing Drops: Formulation and Theory
(American Meteorological Society, 2018)AbstractA numerical formulation is provided for secondary ice production during fragmentation of freezing raindrops or drizzle. This is obtained by pooling laboratory observations from published studies and considering the ... -
Linking African Easterly Wave Activity with Equatorial Waves and the Influence of Rossby Waves from the Southern Hemisphere
(American Meteorological Society, 2018)AbstractA connection is found between African easterly waves (AEWs), equatorial westward-moving mixed Rossby?gravity (WMRG) waves, and equivalent barotropic Rossby waves (RWs) from the Southern Hemisphere (SH). The amplitude ... -
Sensitivity of Idealized Moist Baroclinic Waves to Environmental Temperature and Moisture Content
(American Meteorological Society, 2017)AbstractIdealized simulations are used to examine the sensitivity of moist baroclinic wave growth to environmental temperature and moisture content. With relative humidity held fixed, the surface temperature at 45°N, denoted ... -
Upscale Impact of Mesoscale Disturbances of Tropical Convection on Convectively Coupled Kelvin Waves
(American Meteorological Society, 2017)AbstractTropical convection associated with convectively coupled Kelvin waves (CCKWs) is typically organized by an eastward-moving synoptic-scale convective envelope with numerous embedded westward-moving mesoscale ... -
Axisymmetric Balance Dynamics of Tropical Cyclone Intensification and Its Breakdown Revisited
(American Meteorological Society, 2018)AbstractThis paper revisits the evolution of an idealized tropical cyclone?like vortex forced by a prescribed distribution of diabatic heating in the context of both inviscid and frictional axisymmetric balance dynamics. ... -
A Moist Static Energy Framework for Zonal-Mean Storm-Track Intensity
(American Meteorological Society, 2018)AbstractA moist static energy (MSE) framework for zonal-mean storm-track intensity, defined as the extremum of zonal-mean transient eddy MSE flux, is derived and applied across a range of time scales. According to the ... -
Structural Changes Preceding Rapid Intensification in Tropical Cyclones as Shown in a Large Ensemble of Idealized Simulations
(American Meteorological Society, 2017)AbstractStructural changes that precede rapid intensification (RI) of tropical cyclones (TCs) are examined in a full-physics model by conducting a large ensemble (270) of idealized TC simulations. The processes leading to ... -
Effects of the Low-Level Wind Profile on Outflow Position and Near-Surface Vertical Vorticity in Simulated Supercell Thunderstorms
(American Meteorological Society, 2017)AbstractSupercell thunderstorms are simulated using an idealized numerical model to analyze the effects of modifications to the environmental low-level wind profile on near-surface rotation. Specifically, the orientation, ... -
Effect of Overturning Circulation on Long Equatorial Waves: A Low-Frequency Cutoff
(American Meteorological Society, 2018)AbstractZonally long tropical waves in the presence of a large-scale meridional and vertical overturning circulation are studied in an idealized model based on the intraseasonal multiscale moist dynamics (IMMD) theory. The ... -
The Potential Role of Atmospheric Bores and Gravity Waves in the Initiation and Maintenance of Nocturnal Convection over the Southern Great Plains
(American Meteorological Society, 2018)AbstractThis investigation explores the relationship among bores, gravity waves, and convection within the nocturnal environment through the utilization of measurements taken during the International H2O Project (IHOP_2002) ...