Journal of the Atmospheric Sciences: Recent submissions

Now showing items 3461-3480 of 13215

    • Flow Patterns and Drag in Near-Critical Flow over Isolated Orography 

      Johnson, E. R.; Vilenski, G. G. (American Meteorological Society, 2004)
      Since early manned space flight orographically forced cloud patterns have been described in terms of the single isolated shock structure of shallow-water flow or, equivalently, compressible fluid flow. Some of these ...

    • Abrupt Transition to Strong Superrotation in an Axisymmetric Model of the Upper Troposphere 

      Shell, Karen M.; Held, Isaac M. (American Meteorological Society, 2004)
      Abrupt transitions to strongly superrotating states have been found in some idealized models of the troposphere. These transitions are thought to be caused by feedbacks between the eddy momentum flux convergence in low ...

    • Observations and Numerical Simulations of Inertia–Gravity Waves and Shearing Instabilities in the Vicinity of a Jet Stream 

      Lane, Todd P.; Doyle, James D.; Plougonven, Riwal; Shapiro, Melvyn A.; Sharman, Robert D. (American Meteorological Society, 2004)
      The characteristics and dynamics of inertia?gravity waves generated in the vicinity of an intense jet stream/ upper-level frontal system on 18 February 2001 are investigated using observations from the NOAA Gulfstream-IV ...

    • Small-Scale Mixing, Large-Scale Advection, and Stratospheric Tracer Distributions 

      Vanneste, J. (American Meteorological Society, 2004)
      The vertical mixing of tracers in the stratosphere is mainly due to patches of three-dimensional turbulence, which are highly intermittent in time and space. A simple heuristic model of this form of mixing is developed and ...

    • An Explicit One-Dimensional Time-Dependent Tilting Cloud Model 

      Chen, Shu-Hua; Sun, Wen-Yih (American Meteorological Society, 2004)
      An explicit one-dimensional time-dependent tilting cloud model has been developed for use in cumulus parameterizations. The tilting axis is not necessarily orthogonal to the (r, ?) plane, making the horizontal axisymmetric ...

    • Convective Influence on the Heat Balance of the Tropical Tropopause Layer: A Cloud-Resolving Model Study 

      Kuang, Zhiming; Bretherton, Christopher S. (American Meteorological Society, 2004)
      The tropical tropopause layer (TTL), and in particular the cold point tropopause, has been previously suggested as a feature decoupled from convection. Using a cloud-resolving model, the authors demonstrate that convection, ...

    • Initiation of Precipitation Episodes Relative to Elevated Terrain 

      Ahijevych, D. A.; Davis, C. A.; Carbone, R. E.; Tuttle, J. D. (American Meteorological Society, 2004)
      The western and central United States experience a pronounced diurnal cycle in rainfall during the warm season. Over the higher terrain west of 105°W, most precipitation occurs in the afternoon, whereas the central United ...

    • The Norm Dependence of Singular Vectors 

      Kuang, Zhiming (American Meteorological Society, 2004)
      For a linearized system such as ??/?t = ??, singular vector analysis can be used to find patterns that give the largest or smallest ratios between the sizes of ?? and ?. Such analyses have applications to a wide range of ...

    • The Use of Large-Eddy Simulations in Lagrangian Particle Dispersion Models 

      Weil, Jeffrey C.; Sullivan, Peter P.; Moeng, Chin-Hoh (American Meteorological Society, 2004)
      A Lagrangian dispersion model driven by velocity fields from large-eddy simulations (LESs) is presented for passive particle dispersion in the planetary boundary layer (PBL). In this combined LES?Lagrangian stochastic model ...

    • Remotely Sensed Microphysical and Thermodynamic Properties of Nonuniform Water Cloud Fields 

      Harshvardhan; Guo, Guang; Green, Robert N.; Qu, Zheng; Nakajima, Takashi Y. (American Meteorological Society, 2004)
      Visible and near-infrared reflected radiances have been used to estimate the cloud optical depth and effective radius of cloud-filled global area coverage (GAC) pixels from the Advanced Very High Resolution Radiometer ...

    • The QME AERI LBLRTM: A Closure Experiment for Downwelling High Spectral Resolution Infrared Radiance 

      Turner, D. D.; Tobin, D. C.; Clough, S. A.; Brown, P. D.; Ellingson, R. G.; Mlawer, E. J.; Knuteson, R. O.; Revercomb, H. E.; Shippert, T. R.; Smith, W. L.; Shephard, M. W. (American Meteorological Society, 2004)
      Research funded by the U.S. Department of Energy's Atmospheric Radiation Measurement (ARM) program has led to significant improvements in longwave radiative transfer modeling over the last decade. These improvements, which ...

    • Solar and QBO Influences on the Timing of Stratospheric Sudden Warmings 

      Gray, Lesley J.; Crooks, Simon; Pascoe, Charlotte; Sparrow, Sarah; Palmer, Michael (American Meteorological Society, 2004)
      The interaction of the 11-yr solar cycle (SC) and the quasi-biennial oscillation (QBO) and their influence on the Northern Hemisphere (NH) polar vortex are studied using idealized model experiments and ECMWF Re-Analysis ...

    • The Connection between Coherent Structures and Low-Frequency Wave Packets in Large-Scale Atmospheric Flow 

      Hodyss, Daniel; Nathan, Terrence R. (American Meteorological Society, 2004)
      A theory is presented that addresses the connection between low-frequency wave packets (LFWPs) and the formation and decay of coherent structures (CSs) in large-scale atmospheric flow. Using a weakly nonlinear evolution ...

    • Clouds and Shortwave Fluxes at Nauru. Part II: Shortwave Flux Closure 

      McFarlane, Sally A.; Evans, K. Franklin (American Meteorological Society, 2004)
      The datasets currently being collected by the Atmospheric Radiation Measurement (ARM) program on the islands of Nauru and Manus represent the longest time series of ground-based cloud measurements in the tropical western ...

    • The Angular Momentum Constraint on Climate Sensitivity and Downward Influence in the Middle Atmosphere 

      Shepherd, Theodore G.; Shaw, Tiffany A. (American Meteorological Society, 2004)
      It is shown that under reasonable assumptions, conservation of angular momentum provides a strong constraint on gravity wave drag feedbacks to radiative perturbations in the middle atmosphere. In the time mean, radiatively ...

    • Quantifying Asymmetric Wave Breaking and Two-Way Transport 

      Nakamura, Noboru (American Meteorological Society, 2004)
      Effective diffusivity calculated from a scalar field that obeys the advection?diffusion equation has proved useful for estimating the permeability of unsteady boundaries of air masses such as the edge of the stratospheric ...

    • Dryline Bulge Evolution in a Two-Dimensional Mixed-Layer Model 

      Auslander, Glenn M.; Bannon, Peter R. (American Meteorological Society, 2004)
      This study examines the diurnal response of a mixed-layer model of the dryline system to localized anomalies of surface heat flux, topography, mixed-layer depth, and inversion strength. The two-dimensional, mixed-layer ...

    • Tropical Rain Characteristics and Microphysics in a Three-Dimensional Cloud Model 

      Takahashi, Tsutomu; Shimura, Kazunori (American Meteorological Society, 2004)
      The rain characteristics of convective clouds have been investigated numerically. Five different microphysical model settings have been used to study the roles of various mechanisms influencing rain formation: maritime ice ...

    • Tropical Cyclone Formation in a Sheared Environment: A Case Study 

      Molinari, John; Vollaro, David; Corbosiero, Kristen L. (American Meteorological Society, 2004)
      The development of Hurricane Danny (1997) from depression to hurricane was examined using cloud-to-ground lightning data, reconnaissance aircraft data, and satellite imagery. Vertical wind shear between 850 and 200 hPa of ...

    • Evidence for a k−5/3 Spectrum from the EOLE Lagrangian Balloons in the Low Stratosphere 

      Lacorata, Guglielmo; Aurell, Erik; Legras, Bernard; Vulpiani, Angelo (American Meteorological Society, 2004)
      The EOLE experiment is revisited to study turbulent processes in the lower stratosphere circulation from a Lagrangian viewpoint and to resolve a discrepancy on the slope of the atmospheric energy spectrum between the work ...