Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4101-4120 of 13215
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Large Eddy Simulation of the Diurnal Cycle in Southeast Pacific Stratocumulus
(American Meteorological Society, 2009)This paper describes a series of 6-day large eddy simulations of a deep, sometimes drizzling stratocumulus-topped boundary layer based on forcings from the East Pacific Investigation of Climate (EPIC) 2001 field campaign. ... -
Practical Application of Two-Turning-Point Theory to Mountain-Wave Transmission through a Wind Jet
(American Meteorological Society, 2009)A Fourier method is used to model mountain waves that have nearby turning points in a wind jet. In Fourier space, the propagation equations are solved by ray theory. To correct for the ray singularity at a turning point ... -
Variability of Local Structure Parameters in the Convective Boundary Layer
(American Meteorological Society, 2009)The propagation of optical and acoustical waves is affected by the atmospheric turbulence through the local instantaneous refractive index structure parameter in a volume of characteristic size r, denoted Cn,r2. Often r ... -
Sudden Stratospheric Warmings as Noise-Induced Transitions
(American Meteorological Society, 2008)Sudden stratospheric warmings (SSWs) are usually considered to be initiated by planetary wave activity. Here it is asked whether small-scale variability (e.g., related to gravity waves) can lead to SSWs given a certain ... -
The Response of a Simplified GCM to Axisymmetric Forcings: Applicability of the Fluctuation–Dissipation Theorem
(American Meteorological Society, 2008)Following on their previous work, in which they found the annular modes to be a preferred response of a simplified general circulation model atmosphere to a number of mechanical forcings, the authors now explore the ... -
A Wind Tunnel Study on the Shape, Oscillation, and Internal Circulation of Large Raindrops with Sizes between 2.5 and 7.5 mm
(American Meteorological Society, 2009)Precipitation prediction using weather radars requires detailed knowledge of the shape parameters of raindrops falling at their terminal velocities in air. Because the raindrops undergo oscillation, the most important shape ... -
Zonal Flow Regime Changes in a GCM and in a Simple Quasigeostrophic Model: The Role of Stratospheric Dynamics
(American Meteorological Society, 2009)The atmospheric general circulation is characterized by both single- and double-jet patterns. The double-jet structure of the zonal mean zonal wind is analyzed in Southern Hemisphere observations for the two calendar months ... -
An Interpretation of Baroclinic Initial Value Problems: Results for Simple Basic States with Nonzero Interior PV Gradients
(American Meteorological Society, 2009)In the Eady model, where the meridional potential vorticity (PV) gradient is zero, perturbation energy growth can be partitioned cleanly into three mechanisms: (i) shear instability, (ii) resonance, and (iii) the Orr ... -
CORRIGENDUM
(American Meteorological Society, 2008) -
A Toy Model of the Instability in the Equatorially Trapped Convectively Coupled Waves on the Equatorial Beta Plane
(American Meteorological Society, 2008)The equatorial atmospheric variability shows a spectrum of significant peaks in the wavenumber?frequency domain. These peaks have been identified with the equatorially trapped wave modes of rotating shallow water wave ... -
An Indirect Effect of Ice Nuclei on Atmospheric Radiation
(American Meteorological Society, 2009)A three-dimensional cloud-resolving model (CRM) with observed large-scale forcing is used to study how ice nuclei (IN) affect the net radiative flux at the top of the atmosphere (TOA). In all the numerical experiments ... -
Comments on “Piecewise Potential Vorticity Inversion: Elementary Tests”
(American Meteorological Society, 2008) -
The Role of Eddies in Driving the Tropospheric Response to Stratospheric Heating Perturbations
(American Meteorological Society, 2009)A simplified general circulation model has been used to investigate the chain of causality whereby changes in tropospheric circulation and temperature are produced in response to stratospheric heating perturbations. Spinup ... -
Aerodynamic Contrails: Microphysics and Optical Properties
(American Meteorological Society, 2009)Aerodynamic contrails form when air flows across the wings of subsonic aircraft in cruise. During a short adiabatic expansion phase, high supersaturations trigger burstlike homogeneous ice formation on ambient liquid aerosol ... -
Aerodynamic Contrails: Phenomenology and Flow Physics
(American Meteorological Society, 2009)Aerodynamic contrails have been recognized for a long time although they appear sporadically. Usually one observes them under humid conditions near the ground, where they are short-lived phenomena. Aerodynamic contrails ... -
Characterization of the Martian Surface Layer
(American Meteorological Society, 2009)The authors have estimated the diurnal evolution of Monin?Obukhov length, friction velocity, temperature scale, surface heat flux, eddy-transfer coefficients for momentum and heat, and turbulent viscous dissipation rate ... -
Orographic Flow Response to Variations in Upstream Humidity
(American Meteorological Society, 2008)The effects of upstream relative humidity (RH) on low-level wind and precipitation patterns for low-speed, statically stable flows over a mountain are investigated using idealized two- and three-dimensional numerical-simulation ... -
Dynamical Balances and Tropical Stratospheric Upwelling
(American Meteorological Society, 2008)The dynamical balances associated with upwelling in the tropical lower stratosphere are investigated based on climatological 40-yr ECMWF Re-Analysis (ERA-40) and NCEP?NCAR reanalysis data. Zonal mean upwelling is calculated ... -
Mesoscale Convective Systems and Critical Clusters
(American Meteorological Society, 2009)Size distributions and other geometric properties of mesoscale convective systems (MCSs), identified as clusters of adjacent pixels exceeding a precipitation threshold in satellite radar images, are examined with respect ... -
Equatorial Convectively Coupled Waves in a Simple Multicloud Model
(American Meteorological Society, 2008)Linear stability results for the multicloud model recently developed by the authors on an equatorial beta plane are presented here. The linearized equations, about a realistic radiative?convective equilibrium (RCE) are ...