Journal of the Atmospheric Sciences: Recent submissions

Now showing items 4641-4660 of 13215

    • A Large Eddy Simulation Intercomparison Study of Shallow Cumulus Convection 

      Siebesma, A. Pier; Bretherton, Christopher S.; Brown, Andrew; Chlond, Andreas; Cuxart, Joan; Duynkerke, Peter G.; Jiang, Hongli; Khairoutdinov, Marat; Lewellen, David; Moeng, Chin-Hoh; Sanchez, Enrique; Stevens, Bjorn; Stevens, David E. (American Meteorological Society, 2003)
      This paper reports an intercomparison study on undisturbed trade wind cumulus convection under steady-state conditions as observed during the Barbados Oceanographic and Meteorological Experiment (BOMEX) with 10 large eddy ...

    • Analysis of Humidity Halos around Trade Wind Cumulus Clouds 

      Lu, Miao-Ling; Wang, Jian; Flagan, Richard C.; Seinfeld, John H.; Freedman, Andrew; McClatchey, Robert A.; Jonsson, Haflidi H. (American Meteorological Society, 2003)
      Regions of enhanced humidity in the vicinity of cumulus clouds, so-called cloud halos, reflect features of cloud evolution, exert radiative effects, and may serve as a locus for new particle formation. Reported here are ...

    • Convective Systems over the South China Sea: Cloud-Resolving Model Simulations 

      Tao, W-K.; Shie, C-L.; Simpson, J.; Braun, S.; Johnson, R. H.; Ciesielski, P. E. (American Meteorological Society, 2003)
      The two-dimensional version of the Goddard Cumulus Ensemble (GCE) model is used to simulate two South China Sea Monsoon Experiment (SCSMEX) convective periods [18?26 May (prior to and during the monsoon onset) and 2?11 ...

    • Comments on “On an Improved Model for the Turbulent PBL” 

      Cheng, Y.; Canuto, V. M.; Howard, A. M. (American Meteorological Society, 2003)

    • Supersaturation of Water Vapor in Clouds 

      Korolev, Alexei V.; Mazin, Ilia P. (American Meteorological Society, 2003)
      A theoretical framework is developed to estimate the supersaturation in liquid, ice, and mixed-phase clouds. An equation describing supersaturation in mixed-phase clouds in general form is considered here. The solution for ...

    • Far-Field Simulation of the Hawaiian Wake: Sea Surface Temperature and Orographic Effects 

      Hafner, Jan; Xie, Shang-Ping (American Meteorological Society, 2003)
      Recent satellite observations reveal far-reaching effects of the Hawaiian Islands on surface wind, cloud, ocean current, and sea surface temperature (SST) that extend leeward over an unusually long distance (>1000 km). A ...

    • High-Frequency Planetary Waves in the Polar Middle Atmosphere as Seen in a Data Assimilation System 

      Coy, L.; Štajner, I.; DaSilva, A. M.; Joiner, J.; Rood, R. B.; Pawson, S.; Lin, S. J. (American Meteorological Society, 2003)
      The 4-day wave often dominates the large-scale wind, temperature, and constituent variability in the high-latitude Southern Hemisphere winter near the stratopause. This study examines the winter Southern Hemisphere vortex ...

    • The Interaction of Waves and Convection in the Tropics 

      Lindzen, Richard S. (American Meteorological Society, 2003)
      Interest in tropical waves and their interaction with convection has been rekindled in recent years by the discovery, using satellite infrared data to track high clouds, that such waves closely display the dispersive ...

    • The Origin of Stationary Planetary Waves in the Upper Mesosphere 

      Smith, Anne K. (American Meteorological Society, 2003)
      Satellite observations indicate that quasi-stationary planetary waves often exist to at least 100 km in the winter mesosphere. Waves are also seen in the summer upper mesosphere. A three-dimensional numerical model was ...

    • The Development of a Cyclone–Anticyclone Asymmetry within a Growing Baroclinic Wave 

      Frisius, Thomas (American Meteorological Society, 2003)
      This study examines the cyclone?anticyclone asymmetry within idealized baroclinic waves. For this purpose a primitive equation (PE) model and a quasigeostrophic (QG) model are used. The Rossby number appears to be an ...

    • Diffusivity, Kinetic Energy Dissipation, and Closure Theories for the Poleward Eddy Heat Flux 

      Lapeyre, G.; Held, I. M. (American Meteorological Society, 2003)
      Diffusive eddy closure theory for estimating the poleward heat flux is reexamined and tested in the context of a two-layer homogeneous model. Consideration of the inverse energy cascade induced by baroclinic turbulence on ...

    • On Potential Vorticity Flux Vectors 

      Bannon, Peter R.; Schmidli, Jürg; Schär, Christoph (American Meteorological Society, 2003)
      Dynamical, rather than kinematical, considerations indicate that a generalized potential vorticity in terms of the gradient of an arbitrary scalar function requires that the potential vorticity flux vector contain a ...

    • An Expression for Effective Buoyancy in Surroundings with Horizontal Density Gradients 

      Davies-Jones, Robert (American Meteorological Society, 2003)
      An expression is obtained for effective buoyancy per unit volume in inviscid anelastic flow with surrounding horizontal density variations. Effective buoyancy is defined here as the statically forced part of the locally ...

    • Hamiltonian Description of Idealized Binary Geophysical Fluids 

      Bannon, Peter R. (American Meteorological Society, 2003)
      A Hamiltonian formulation for the dynamics and thermodynamics of a compressible, rotating, binary fluid subject to gravity is developed. Here, binary refers to the presence of two components of the fluid, such as solids ...

    • A Prognostic Turbulence Scheme for the Nonhydrostatic Plume Model ATHAM 

      Herzog, Michael; Oberhuber, Josef M.; Graf, Hans-F. (American Meteorological Society, 2003)
      The presented turbulence scheme was developed for the Active Tracer High-Resolution Atmospheric Model (ATHAM) to parameterize the effect of subgrid-scale turbulence. In contrast to the commonly used assumption of local ...

    • A Fast, Accurate Method of Computing Near-Surface Longwave Fluxes and Cooling Rates in the Atmosphere 

      Varghese, Saji; Vasudeva Murthy, A. S.; Narasimha, Roddam (American Meteorological Society, 2003)
      As radiation plays a key role in the determination of the near-surface thermal environment, great accuracy is required in the computation of radiative fluxes, especially because a small error in the fluxes can lead to large ...

    • Properties and Parameterization of the Stable Boundary Layer over Moderate Topography 

      Brown, A. R.; Wood, N. (American Meteorological Society, 2003)
      Numerical simulations are used to investigate the impact on the stable boundary layer of moderate topography (with hill heights in some cases comparable to the undisturbed boundary layer depth). Area-averaged properties ...

    • Influence of Mach Number on Tornado Corner Flow Dynamics 

      Xia, J.; Lewellen, W. S.; Lewellen, D. C. (American Meteorological Society, 2003)
      Since maximum Mach numbers in an F5 tornado are expected to, at least, reach ?0.4, a study was undertaken to determine the major potential compressibility effects in such flows. Results from compressible large-eddy simulations ...

    • Evolution of Mixed Rossby–Gravity Waves in Idealized MJO Environments 

      Aiyyer, Anantha R.; Molinari, John (American Meteorological Society, 2003)
      A linear shallow water model is used to simulate the evolution of mixed Rossby?gravity (MRG) waves in background states representative of the convective phase of the Madden?Julian oscillation (MJO). Initial MRG wave ...

    • The Calculation of Climatically Relevant Singular Vectors in the Presence of Weather Noise as Applied to the ENSO Problem 

      Kleeman, Richard; Tang, Youmin; Moore, Andrew M. (American Meteorological Society, 2003)
      An efficient technique for the extraction of climatically relevant singular vectors in the presence of weather noise is presented. This technique is particularly relevant to the analysis of coupled general circulation ...