Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2941-2960 of 13215
-
On the Definition of the Cloud Water Content Fluctuations and Its Effects on the Computation of a Second-Order Liquid Water Correlation
(American Meteorological Society, 2007)In subgrid-scale condensation schemes of cloud models, the majority of previous authors have relied on results presented in a paper by Bougeault. In the present paper, second-order liquid water correlations are restated ... -
A General Method for Conserving Energy and Potential Enstrophy in Shallow-Water Models
(American Meteorological Society, 2007)The shallow-water equations may be posed in the form df?/dt = {F, H, Z}, where H is the energy, Z is the potential enstrophy, and the Nambu bracket {F, H, Z} is completely antisymmetric in its three arguments. This makes ... -
Simultaneous Measurement of Condensation and Thermal Accommodation Coefficients for Cloud Droplet Growth in Due Consideration of a New Moving Surface-Boundary Effect
(American Meteorological Society, 2007)A droplet growth theory that describes a new effect of vapor and temperature field shift due to the growth-based movement of droplet surface boundary (moving boundary effect) was derived and found to enhance the growth ... -
A Simple Multicloud Parameterization for Convectively Coupled Tropical Waves. Part II: Nonlinear Simulations
(American Meteorological Society, 2007)Observations in the Tropics point to the important role of three cloud types, congestus, stratiform, and deep convective clouds, besides ubiquitous shallow boundary layer clouds for both the climatology and large-scale ... -
The Influence of Time-Dependent Melting on the Dynamics and Precipitation Production in Maritime and Continental Storm Clouds
(American Meteorological Society, 2007)Simulations of one maritime and four continental observed cases of deep convection are performed with the Hebrew University Cloud Model that has spectral bin microphysics. The maritime case is from observations made on 18 ... -
Numerical and Experimental Investigation of the Neutral Atmospheric Surface Layer
(American Meteorological Society, 2007)This study combines the experimental measurements with large-eddy simulation (LES) data of a neutral planetary boundary layer (PBL) documented by a 60-m tower instrumented with eight sonic anemometers, and a high-resolution ... -
Impact of Atmosphere–Ocean Coupling on the Predictability of Monsoon Intraseasonal Oscillations
(American Meteorological Society, 2007)The impact of air?sea coupling on the predictability of monsoon intraseasonal oscillations (MISO) has been investigated with an atmosphere?ocean coupled model and its atmospheric component. From a 15-yr coupled control ... -
The Effect of Lower Stratospheric Shear on Baroclinic Instability
(American Meteorological Society, 2007)Using a hierarchy of models, and observations, the effect of vertical shear in the lower stratosphere on baroclinic instability in the tropospheric midlatitude jet is examined. It is found that increasing stratospheric ... -
Evolution of Low-Level Angular Momentum in the 2 June 1995 Dimmitt, Texas, Tornado Cyclone
(American Meteorological Society, 2007)The life cycle of the 2 June 1995 Dimmitt, Texas, tornado cyclone, observed during the Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX), is described. The tornado cyclone here is defined as a ... -
The Primary Nonlinear Dynamics of Modal and Nonmodal Perturbations of Monochromatic Inertia–Gravity Waves
(American Meteorological Society, 2007)The breaking of an inertia?gravity wave (IGW), initiated by its leading normal modes (NMs) or singular vectors (SVs), and the resulting small-scale eddies are investigated by means of direct numerical simulations of a ... -
Time Step Sensitivity of Nonlinear Atmospheric Models: Numerical Convergence, Truncation Error Growth, and Ensemble Design
(American Meteorological Society, 2007)Computational models based on discrete dynamical equations are a successful way of approaching the problem of predicting or forecasting the future evolution of dynamical systems. For linear and mildly nonlinear models, the ... -
Angular Momentum Conservation and Gravity Wave Drag Parameterization: Implications for Climate Models
(American Meteorological Society, 2007)The robustness of the parameterized gravity wave response to an imposed radiative perturbation in the middle atmosphere is examined. When momentum is conserved and for reasonable gravity wave drag parameters, the response ... -
Dynamic Radiative–Convective Equilibria Using GCM Column Physics
(American Meteorological Society, 2007)The behavior of a GCM column physics package in a nonrotating, doubly periodic, homogeneous setting with prescribed SSTs is examined. This radiative?convective framework is proposed as a useful tool for studying some of ... -
Eddy Influences on Hadley Circulations: Simulations with an Idealized GCM
(American Meteorological Society, 2006)An idealized GCM is used to investigate how the strength and meridional extent of the Hadley circulation depend on the planet radius, rotation rate, and thermal driving. Over wide parameter ranges, the strength and meridional ... -
Linear and Nonlinear Signatures in the Planetary Wave Dynamics of an AGCM: Probability Density Functions
(American Meteorological Society, 2007)To identify and quantify indications of linear and nonlinear planetary wave behavior and their impact on the distribution of atmospheric states, characteristics of a very long integration of an atmospheric general circulation ... -
On the Parameterization of Surface Roughness at Regional Scales
(American Meteorological Society, 2007)A parameterization for surface roughness and blending height at regional scales, under neutral atmospheric stability, is studied and tested. The analysis is based on a suite of large-eddy simulations (LES) over surfaces ... -
Dynamics of Eddy-Driven Low-Frequency Dipole Modes. Part II: Free Mode Characteristics of NAO and Diagnostic Study
(American Meteorological Society, 2007)Through calculating the scatter diagrams of the streamfunction (?P or ?T) versus potential vorticity (PV) (qP or qT), where ?P and ?T are the planetary-scale streamfunction and total streamfunction, respectively, and using ... -
Dynamics of Eddy-Driven Low-Frequency Dipole Modes. Part I: A Simple Model of North Atlantic Oscillations
(American Meteorological Society, 2007)A simple theoretical model is proposed to clarify how synoptic-scale waves drive the life cycle of the North Atlantic Oscillation (NAO) with a period of nearly two weeks. This model is able to elucidate what determines the ... -
Evolution of Dipole-Type Blocking Life Cycles: Analytical Diagnoses and Observations
(American Meteorological Society, 2007)A variable coefficient Korteweg?de Vries (VCKdV) system is derived by considering the time-dependent background flow and boundary conditions from a nonlinear, inviscid, nondissipative, and equivalent barotropic vorticity ... -
Numerical Simulation of Cloud–Clear Air Interfacial Mixing: Effects on Cloud Microphysics
(American Meteorological Society, 2006)This paper extends the previously published numerical study of Andrejczuk et al. on microscale cloud?clear air mixing. Herein, the primary interest is on microphysical transformations. First, a convergence study is ...