Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2261-2280 of 13215
-
Upstream-Propagating Wave Modes in Moist and Dry Flow over Topography
(American Meteorological Society, 2012)revious studies have observed upstream-propagating modes in two-dimensional numerical simulations of idealized flow over topography with moist, nearly neutral conditions in the troposphere, topped by a stable stratosphere. ... -
The Spectrum of Convectively Coupled Kelvin Waves and the Madden–Julian Oscillation in Regions of Low-Level Easterly and Westerly Background Flow
(American Meteorological Society, 2012)he zonal wavenumber?frequency power spectrum of outgoing longwave radiation in the global tropics suggests that power in convectively coupled Kelvin waves and the Madden?Julian oscillation (MJO) is organized into two ... -
Deep Convective Systems Observed by A-Train in the Tropical Indo-Pacific Region Affected by the MJO
(American Meteorological Society, 2012)n the Indo-Pacific region, mesoscale convective systems (MCSs) occur in a pattern consistent with the eastward propagation of the large-scale convective envelope of the Madden?Julian oscillation (MJO). MCSs are major ... -
Atmospheric Available Energy
(American Meteorological Society, 2012)he total potential energy of the atmosphere is the sum of its internal and gravitational energies. The portion of this total energy available to be converted into kinetic energy is determined relative to an isothermal, ... -
Cloud-Resolving Model Simulations with One- and Two-Way Couplings via the Weak Temperature Gradient Approximation
(American Meteorological Society, 2012)cloud-resolving model is modified to implement the weak temperature gradient approximation in order to simulate the interactions between tropical convection and the large-scale tropical circulation. The instantaneous ... -
Effects of the Quasi-Biennial Oscillation and Stratospheric Semiannual Oscillation on Tracer Transport in the Upper Stratosphere
(American Meteorological Society, 2012)sing satellite observations together with a chemistry?climate model (CCM), the effect of the stratospheric semiannual oscillation (SAO) and quasi-biennial oscillation (QBO) on the equatorial double peak in observed CH4 and ... -
An Investigation of Composite Dropsonde Profiles for Developing and Nondeveloping Tropical Waves during the 2010 PREDICT Field Campaign
(American Meteorological Society, 2012)omposite dropsonde profiles are analyzed for developing and nondeveloping tropical waves in an attempt to improve the understanding of tropical cyclogenesis. These tropical waves were sampled by 25 reconnaissance missions ... -
A Simple Framework for the Dynamic Response of Cirrus Clouds to Local Diabatic Radiative Heating
(American Meteorological Society, 2012)his paper presents a simple analytical framework for the dynamic response of cirrus to a local radiative flux convergence, expressible in terms of three independent modes of cloud evolution. Horizontally narrow and tenuous ... -
A Comparison of the Water Budgets between Clouds from AMMA and TWP-ICE
(American Meteorological Society, 2012)wo field campaigns, the African Monsoon Multidisciplinary Analysis (AMMA) and the Tropical Warm Pool?International Cloud Experiment (TWP-ICE), took place in 2006 near Niamey, Niger, and Darwin, Northern Territory, Australia, ... -
Assessment of Aerosol Modes Used in the MODIS Ocean Aerosol Retrieval
(American Meteorological Society, 2012)oastal and island Aerosol Robotic Network (AERONET) sites are used to determine characteristic aerosol modes over marine environments. They are compared with the assumed modes used in the operational Moderate Resolution ... -
A Method for Adaptive Habit Prediction in Bulk Microphysical Models. Part I: Theoretical Development
(American Meteorological Society, 2012)ulk microphysical schemes use the capacitance model for ice vapor growth in combination with mass?size relationships to determine the evolution of ice water content (IWC) and ice particle maximum dimension in time. These ... -
Symmetric and Asymmetric Structures of Hurricane Boundary Layer in Coupled Atmosphere–Wave–Ocean Models and Observations
(American Meteorological Society, 2012)t is widely accepted that air?sea interaction is one of the key factors in controlling tropical cyclone (TC) intensity. However, the physical mechanisms for connecting the upper ocean and air?sea interface with storm ... -
Dynamics and Practical Predictability of Extratropical Wintertime Low-Frequency Variability in a Low-Dimensional System
(American Meteorological Society, 2012)ynamics and practical predictability of extratropical low-frequency variability (LFV) in Northern Hemisphere winter are examined in the framework of a two-dimensional (2D) stochastic differential equation (SDE) on the phase ... -
Momentum Flux and Flux Divergence of Gravity Waves in Directional Shear Flows over Three-Dimensional Mountains
(American Meteorological Society, 2012)inear mountain wave theory is used to derive the general formulas of the gravity wave momentum flux (WMF) and its vertical divergence that develop in directionally sheared flows with constant vertical shear. Height variations ... -
Spectrally Consistent Scattering, Absorption, and Polarization Properties of Atmospheric Ice Crystals at Wavelengths from 0.2 to 100 μm
(American Meteorological Society, 2012)data library is developed containing the scattering, absorption, and polarization properties of ice particles in the spectral range from 0.2 to 100 ?m. The properties are computed based on a combination of the Amsterdam ... -
Incorporating the Effects of 3D Radiative Transfer in the Presence of Clouds into Two-Stream Multilayer Radiation Schemes
(American Meteorological Society, 2012)his paper presents a new method for representing the important effects of horizontal radiation transport through cloud sides in two-stream radiation schemes. Ordinarily, the radiative transfer equations are discretized ... -
Nonstationary Trapped Lee Waves Generated by the Passage of an Isolated Jet
(American Meteorological Society, 2012)he behavior of nonstationary trapped lee waves in a nonsteady background flow is studied using idealized three-dimensional (3D) numerical simulations. Trapped waves are forced by the passage of an isolated, synoptic-scale ... -
Tropical Stationary Wave Response to ENSO: Diabatic Heating Influence on the Indian Summer Monsoon
(American Meteorological Society, 2012)he atmospheric response to boreal summer tropical diabatic heating is studied in the atmospheric model component of the Community Atmosphere Model [CAM, version 3 (CAM3)] of the National Center for Atmospheric Research. ... -
Tornadogenesis in a Simulated Mesovortex within a Mesoscale Convective System
(American Meteorological Society, 2012)he Advanced Regional Prediction System (ARPS) is used to simulate a tornadic mesovortex with the aim of understanding the associated tornadogenesis processes. The mesovortex was one of two tornadic mesovortices spawned by ... -
Mechanisms of Banner Cloud Formation
(American Meteorological Society, 2013)anner clouds are clouds in the lee of steep mountains or sharp ridges. Their formation has previously been hypothesized as due to three different mechanisms: (i) vertical uplift in a lee vortex (which has a horizontal ...