Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3401-3420 of 13215
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Reexamining the Near-Core Radial Structure of the Tropical Cyclone Primary Circulation: Implications for Vortex Resiliency
(American Meteorological Society, 2005)Recent theoretical studies, based on vortex Rossby wave (VRW) dynamics, have established the importance of the radial structure of the primary circulation in the response of tropical cyclone (TC)?like vortices to ambient ... -
Aerosol Characteristics and Radiative Impacts over the Arabian Sea during the Intermonsoon Season: Results from ARMEX Field Campaign
(American Meteorological Society, 2005)During the second phase of the Arabian Sea Monsoon Experiment (ARMEX-II), extensive measurements of spectral aerosol optical depth, mass concentration, and mass size distribution of ambient aerosols as well as mass ... -
An Arctic Springtime Mixed-Phase Cloudy Boundary Layer Observed during SHEBA
(American Meteorological Society, 2005)The microphysical characteristics, radiative impact, and life cycle of a long-lived, surface-based mixed-layer, mixed-phase cloud with an average temperature of approximately ?20°C are presented and discussed. The cloud ... -
The Theory of Ice Nucleation by Heterogeneous Freezing of Deliquescent Mixed CCN. Part II: Parcel Model Simulation
(American Meteorological Society, 2005)The new theory of ice nucleation by heterogeneous freezing of deliquescent mixed cloud condensation nuclei (CCN) presented in Part I is incorporated into a parcel model with explicit water and ice bin microphysics to ... -
Constant Raindrop Fall Speed Profiles Derived from Doppler Radar Data Analyses for Steady Nonconvective Precipitation
(American Meteorological Society, 2005)For nonconvective, steady light rain with rain rates <5 mm h?1 the mean Doppler velocity of raindrop spectra was found to be constant below the melting band, when the drop-free fall speed was adjusted for pressure. The ... -
Spatial and Temporal Variations of Gravity Wave Parameters. Part I: Intrinsic Frequency, Wavelength, and Vertical Propagation Direction
(American Meteorological Society, 2005)Five years (1998?2002) of U.S. high vertical resolution radiosonde data are analyzed to derive important gravity wave parameters, such as intrinsic frequencies, vertical and horizontal wavelengths, and vertical propagation ... -
Equatorial Superrotation and the Factors Controlling the Zonal-Mean Zonal Winds in the Tropical Upper Troposphere
(American Meteorological Society, 2005)The response of the zonal-mean zonal winds in the tropical upper troposphere to thermal forcing in the Tropics is studied using an idealized general circulation model with 18 vertical levels and simplified atmospheric ... -
Extratropical Dry-Air Intrusions into the West African Monsoon Midtroposphere: An Important Factor for the Convective Activity over the Sahel
(American Meteorological Society, 2005)This paper investigates the relationship between large-scale dynamics, water vapor, and organized convection over West Africa. Making use of a simplified condensation hypothesis, a back-trajectory model fed by NCEP-analyzed ... -
Is Environmental CAPE Important in the Determination of Maximum Possible Hurricane Intensity?
(American Meteorological Society, 2005)In numerical simulations using an axisymmetric, cloud-resolving hurricane model, hurricane intensity shows quasi-steady-state behavior. This quasi-steady intensity is interpreted as the maximum possible intensity (MPI) of ... -
Comments on “On Internal Waves in a Lagrangian Reference Frame”
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Inferring Fall Attitudes of Pristine Dendritic Crystals from Polarimetric Radar Data
(American Meteorological Society, 2005)Single pristine planar ice crystals exhibit some flutter around their preferential horizontal orientation as they fall. This study presents estimates of flutter and analyzes predominant fall attitudes of pristine dendritic ... -
Observations of Drizzle in Nocturnal Marine Stratocumulus
(American Meteorological Society, 2005)In situ and radar data from the second field study of the Dynamics and Chemistry of Marine Stratocumulus (DYCOMS-II) have been used to study drizzle in stratocumulus. Measurements indicate that drizzle is prevalent. During ... -
Homogeneous Ice Nucleation in Subtropical and Tropical Convection and Its Influence on Cirrus Anvil Microphysics
(American Meteorological Society, 2005)This study uses a unique set of microphysical measurements obtained in a vigorous, convective updraft core at temperatures between ?33° and ?36°C, together with a microphysical model, to investigate the role of homogeneous ... -
Zonal Asymmetries, Teleconnections, and Annular Patterns in a GCM
(American Meteorological Society, 2005)The influence of zonally asymmetric boundary conditions on the leading modes of variability in a suite of atmospheric general circulation models is investigated. The set of experiments consists of nine model configurations, ... -
Assessment of Hydrometeor Collection Rates from Exact and Approximate Equations. Part I: A New Approximate Scheme
(American Meteorological Society, 2005)The collection equation is analyzed for the case of two spherical hydrometeors with collection efficiency unity and exponential size distributions. When the fall velocities are significantly different a more general form ... -
Momentum Flux Spectrum of Convectively Forced Internal Gravity Waves and Its Application to Gravity Wave Drag Parameterization. Part I: Theory
(American Meteorological Society, 2005)The phase-speed spectrum of momentum flux by convectively forced internal gravity waves is analytically formulated in two- and three-dimensional frameworks. For this, a three-layer atmosphere that has a constant vertical ... -
Dynamics of 2-Day Equatorial Waves
(American Meteorological Society, 2004)The dynamics of the 2-day wave, a type of convectively coupled disturbance that frequents the equatorial western Pacific, is examined using observations and a linear primitive equation model. A statistical composite of the ... -
Observed Cyclone–Anticyclone Tropopause Vortex Asymmetries
(American Meteorological Society, 2005)Relatively little is known about coherent vortices near the extratropical tropopause, even with regard to basic facts about their frequency of occurrence, longevity, and structure. This study addresses these issues through ... -
Mechanisms of Up-Valley Winds
(American Meteorological Society, 2004)The basic physical mechanisms governing the daytime evolution of up-valley winds in mountain valleys are investigated using a series of numerical simulations of thermally driven flow over idealized three-dimensional ...