Journal of the Atmospheric Sciences: Recent submissions

Now showing items 3341-3360 of 13215

    • Droplets to Drops by Turbulent Coagulation 

      Riemer, N.; Wexler, A. S. (American Meteorological Society, 2005)
      This study addresses two central problems in cloud microphysics. The first is the source of large droplets, which initiates the rapid production of warm rain. The second is the broadening of the cloud droplet spectrum at ...

    • Designing Chaotic Models 

      Lorenz, Edward N. (American Meteorological Society, 2005)
      After enumerating the properties of a simple model that has been used to simulate the behavior of a scalar atmospheric quantity at one level and one latitude, this paper describes the process of designing one modification ...

    • Numerical Simulation of Boundary Layer Structure and Cross-Equatorial Flow in the Eastern Pacific 

      Small, R. Justin; Xie, Shang-Ping; Wang, Yuqing; Esbensen, Steven K.; Vickers, Dean (American Meteorological Society, 2005)
      Recent observations from spaceborne microwave sensors have revealed detailed structure of the surface flow over the equatorial eastern Pacific in the boreal fall season. A marked acceleration of surface wind across the ...

    • Possible Effects of Collisional Breakup on Mixed-Phase Deep Convection Simulated by a Spectral (Bin) Cloud Model 

      Seifert, Axel; Khain, Alexander; Blahak, Ulrich; Beheng, Klaus D. (American Meteorological Society, 2005)
      The effects of the collisional breakup of raindrops are investigated using the Hebrew University Cloud Model (HUCM). The parameterizations, which are combined in the new breakup scheme, are those of Low and List, Beard and ...

    • A New Look at the Pacific Storm Track Variability: Sensitivity to Tropical SSTs and to Upstream Seeding 

      Orlanski, Isidoro (American Meteorological Society, 2005)
      There is a fairly well defined stationary wave and storm track response to El Niño SSTs over the Pacific. In this paper, the case is made that this response is a direct result of increased baroclinicity in the central ...

    • On Bulk Models of Shallow Cumulus Convection 

      Bellon, Gilles; Stevens, Bjorn (American Meteorological Society, 2005)
      Two-layer bulk models of the cloudy boundary layer are investigated, focusing on the consistency issues between common assumptions on the turbulent mixing and the thermodynamic profiles. Simplifications of the vertical ...

    • Diurnal Cycle of Convective Instability around the Central Mountains in Japan during the Warm Season 

      Sato, Tomonori; Kimura, Fujio (American Meteorological Society, 2005)
      Convective rainfall often shows a clear diurnal cycle. The nighttime peak of convective activity prevails in various regions near the world's mountains. The influence of the water vapor and convective instability upon ...

    • Entropy Sources in Equilibrium Conditions over a Tropical Ocean 

      Warner, Charles (American Meteorological Society, 2005)
      Confusion has existed as to sources of entropy due to irreversible processes in the atmosphere, the total of which matches the export of entropy by radiation. What is the mechanical efficiency of convection? For an ideal ...

    • Moisture Tendency Equations in a Tropical Atmosphere 

      López Carrillo, C.; Raymond, D. J. (American Meteorological Society, 2005)
      Direct diagnostic evaluation of the moisture tendency in the moisture equation is very difficult in practice because two poorly measured terms, moisture convergence and precipitation, dominate the equation. Using the near ...

    • Cloud Properties Simulated by a Single-Column Model. Part I: Comparison to Cloud Radar Observations of Cirrus Clouds 

      Luo, Yali; Krueger, Steven K.; Moorthi, Shrinivas (American Meteorological Society, 2005)
      This study describes and demonstrates a new method for identifying deficiencies in how cloud processes are represented in large-scale models. Kilometer-scale-resolving cloud radar observations and cloud-resolving model ...

    • A Baroclinic Instability that Couples Balanced Motions and Gravity Waves 

      Plougonven, Riwal; Muraki, David J.; Snyder, Chris (American Meteorological Society, 2005)
      Normal modes of a linear vertical shear (Eady shear) are studied within the linearized primitive equations for a rotating stratified fluid above a rigid lower boundary. The authors' interest is in modes having an inertial ...

    • Southern Hemisphere Blocking Onsets Associated with Upper-Tropospheric Divergence Anomalies 

      Sáez de Adana, F. Javier; Colucci, Stephen J. (American Meteorological Society, 2005)
      Upper-tropospheric divergence anomalies and divergence tendencies prior to and during the onset of blocking have been investigated for selected cases over the Southern Hemisphere in search of links between the upper-tropospheric ...

    • What Causes the Divergences in Local Second-Order Closure Models? 

      Canuto, V. M.; Cheng, Y.; Howard, A. M. (American Meteorological Society, 2005)
      It has been known for three decades that in the case of buoyancy-driven flows the widely used second-order closure (SOC) level-2.5 turbulence models exhibit divergences that render them unphysical in certain domains. This ...

    • Life Cycle of Numerically Simulated Shallow Cumulus Clouds. Part II: Mixing Dynamics 

      Zhao, Ming; Austin, Philip H. (American Meteorological Society, 2005)
      This paper is the second in a two-part series in which life cycles of six numerically simulated shallow cumulus clouds are systematically examined. The six clouds, selected from a single realization of a large-eddy simulation, ...

    • Life Cycle of Numerically Simulated Shallow Cumulus Clouds. Part I: Transport 

      Zhao, Ming; Austin, Philip H. (American Meteorological Society, 2005)
      This paper is the first in a two-part series in which the life cycles of numerically simulated shallow cumulus clouds are systematically examined. The life cycle data for six clouds with a range of cloud-top heights are ...

    • Observations and Modeling of Banded Orographic Convection 

      Kirshbaum, Daniel J.; Durran, Dale R. (American Meteorological Society, 2005)
      Radar images and numerical simulations of three shallow convective precipitation events over the Coastal Range in western Oregon are presented. In one of these events, unusually well-defined quasi-stationary banded formations ...

    • Monte Carlo Simulation of the Formation of Snowflakes 

      Maruyama, Ken-ichi; Fujiyoshi, Yasushi (American Meteorological Society, 2005)
      A stochastic microphysical model of snow aggregation that combines a simple aggregation model with a Monte Carlo method was developed. Explicit treatment of the shape of individual snowflakes in the new model facilitates ...

    • Wave Response during Hydrostatic and Geostrophic Adjustment. Part II: Potential Vorticity Conservation and Energy Partitioning 

      Chagnon, Jeffrey M.; Bannon, Peter R. (American Meteorological Society, 2005)
      This second part of a two-part study of the hydrostatic and geostrophic adjustment examines the potential vorticity and energetics of the acoustic waves, buoyancy waves, Lamb waves, and steady state that are generated ...

    • Numerical Simulations of Interactions between Gravity Waves and Deep Moist Convection 

      Eitzen, Zachary A.; Randall, David A. (American Meteorological Society, 2005)
      This study uses a numerical model to simulate deep convection both in the Tropics over the ocean and the midlatitudes over land. The vertical grid that was used extends into the stratosphere, allowing for the simultaneous ...

    • Multiplicative Noise and Non-Gaussianity: A Paradigm for Atmospheric Regimes? 

      Sura, Philip; Newman, Matthew; Penland, Cécile; Sardeshmukh, Prashant (American Meteorological Society, 2005)
      Atmospheric circulation statistics are not strictly Gaussian. Small bumps and other deviations from Gaussian probability distributions are often interpreted as implying the existence of distinct and persistent nonlinear ...