Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3961-3980 of 13215
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Convectively Coupled Waves Propagating along an Equatorial ITCZ
(American Meteorological Society, 2009)The dynamics of convectively coupled gravity waves traveling over a precipitating region are analyzed in an idealized model for the large-scale atmospheric circulation. The model is composed of a shallow water system coupled ... -
An Analytic Scaling Law for the Depositional Growth of Snow in Thin Mixed-Phase Layer Clouds
(American Meteorological Society, 2009)In various practical problems, such as assessing the threat of aircraft icing or calculating radiative transfer, it is important to know whether mixed-phase clouds contain significant liquid water content. Some mixed-phase ... -
Coplanar Doppler Lidar Retrieval of Rotors from T-REX
(American Meteorological Society, 2010)Dual-Doppler analysis of data from two coherent lidars during the Terrain-Induced Rotor Experiment (T-REX) allows the retrieval of flow structures, such as vortices, during mountain-wave events. The spatial and temporal ... -
The Size Distribution and Mass-Weighted Terminal Velocity of Low-Latitude Tropopause Cirrus Crystal Populations
(American Meteorological Society, 2009)Ice crystal terminal velocities govern the lifetime of radiatively complex, climatologically important, low-latitude tropopause cirrus clouds. To better understand cloud lifetimes, the terminal velocities of low-latitude ... -
Instability Analysis of Terrain-Induced Canopy Flows
(American Meteorological Society, 2009)Tall vegetation and complex terrain create difficult conditions for measuring and modeling net ecosystem?atmosphere exchanges of carbon, water vapor, and pollutants. The instability of canopy flow regimes over complex ... -
Global Extratropical Response to Diabatic Heating Variability of the Asian Summer Monsoon
(American Meteorological Society, 2009)Global teleconnections associated with the Asian summer monsoon convective activities are investigated based on monthly data of 29 Northern Hemisphere summers defined as June?September (JJAS). Two distinct teleconnection ... -
Characterization of the Martian Convective Boundary Layer
(American Meteorological Society, 2009)The authors have carried out an extensive characterization of the Martian mixed layer formed under convective conditions. The values of the mixed layer height, convective velocity scale, convective temperature scale, mean ... -
Case Study of a Developing African Easterly Wave during NAMMA: An Energetic Point of View
(American Meteorological Society, 2009)The West African perturbation that subsequently evolved into Hurricane Helene (2006) during NASA?s African Monsoon Multidisciplinary Analysis (NAMMA), 15 August?14 September 2006, and AMMA?s third special observing period ... -
Homogeneous and Inhomogeneous Mixing in Cumulus Clouds: Dependence on Local Turbulence Structure
(American Meteorological Society, 2009)The helicopter-borne instrument payload known as the Airborne Cloud Turbulence Observation System (ACTOS) was used to study the entrainment and mixing processes in shallow warm cumulus clouds. The characteristics of the ... -
Observed Synoptic-Scale Variability during the Developing Phase of an ISO over the Indian Ocean during MISMO
(American Meteorological Society, 2009)A case study of an intraseasonal oscillation (ISO) is investigated in the period leading up to its convectively active phase during the Mirai Indian Ocean Cruise for the Study of the MJO-Convection Onset (MISMO), which was ... -
Tropopause-Level Waveguides
(American Meteorological Society, 2010)Jet streams located on the dynamical tropopause are accompanied by coaligned bands of enhanced potential vorticity (PV) gradients, and these bands can serve as space?time evolving waveguides for synoptic and larger-scale ... -
Sensitivity Studies of Aerosol–Cloud Interactions in Mixed-Phase Orographic Precipitation
(American Meteorological Society, 2009)Anthropogenic aerosols serve as a source of both cloud condensation nuclei (CCN) and ice nuclei (IN) and affect microphysical properties of clouds. Increasing aerosol number concentration is assumed to retard the cloud ... -
Multiangular Polarized Characteristics of Optically Thin Cirrus in the Visible and Near-Infrared Spectral Region
(American Meteorological Society, 2010)Optically thin cirrus play a key role in the earth?s radiation budget and global climate change. Their radiative effects depend critically on the thin cirrus optical and microphysical properties. In this paper, inhomogeneous ... -
Moist Dynamical Linkage between the Equatorial Indian Ocean and the South Asian Monsoon Trough
(American Meteorological Society, 2010)During boreal summer, both the monsoon trough and the equatorial Indian Ocean (EIO) receive intense climatological precipitation. At various time scales, EIO sea surface temperature (SST) and/or precipitation variations ... -
On the Relationship between African Easterly Waves and the African Easterly Jet
(American Meteorological Society, 2009)This idealized modeling study investigates how convectively triggered African easterly waves (AEWs) are influenced by the intraseasonal variability of the African easterly jet (AEJ). A set of 10-day averaged zonally varying ... -
The Atmospheric Boundary Layer during Swell: A Field Study and Interpretation of the Turbulent Kinetic Energy Budget for High Wave Ages
(American Meteorological Society, 2009)Analysis of the turbulent kinetic energy (TKE) budget for five slightly unstable cases with swell has been performed based on measurements of mechanical production, buoyancy production, turbulent transport, and dissipation ... -
Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part II: Seasonal and Interannual Variability
(American Meteorological Society, 2009)The Lyapunov diffusivity is used to investigate local isentropic mixing events in the upper troposphere?lower stratosphere (UTLS) region. The diagnostic highlights the seasonal cycle of the longitudinally varying mixing ... -
A Theory of Baroclinic Turbulence
(American Meteorological Society, 2009)Understanding the physical mechanism maintaining fluid turbulence remains a fundamental theoretical problem. The two-layer model is an analytically and computationally simple system in which the dynamics of turbulence can ... -
Gravity Waves in Shear and Implications for Organized Convection
(American Meteorological Society, 2009)It is known that gravity waves in the troposphere, which are often excited by preexisting convection, can favor or suppress the formation of new convection. Here it is shown that in the presence of wind shear or barotropic ... -
Orographic Precipitation in the Tropics: Large-Eddy Simulations and Theory
(American Meteorological Society, 2009)Recent radar and rain gauge observations from the Caribbean island of Dominica (15°N) show a strong orographic enhancement of trade wind precipitation. The mechanisms behind this enhancement are investigated using idealized ...