Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4601-4620 of 13215
-
Large-Eddy Simulation: How Large is Large Enough?
(American Meteorological Society, 2004)The length scale evolution of various quantities in a clear convective boundary layer (CBL), a stratocumulus-topped boundary layer, and three radiatively cooled (?smoke cloud?) convective boundary layers are studied by ... -
A Method of Specifying the Gravity Wave Spectrum above Convection Based on Latent Heating Properties and Background Wind
(American Meteorological Society, 2004)The spectrum of convectively generated gravity waves is currently not resolved in general circulation models and must be parameterized. Due to the lack of understanding of the connection between convection properties and ... -
Atmospheric Contributions to Earth Nutation: Geodetic Constraints and Limitations of the Torque Approach
(American Meteorological Society, 2004)Atmospheric motions in the retrograde diurnal (S1) band are of interest to a wide community of researchers in earth dynamics and geodesy, due to their potential contribution to the low-frequency motions of the rotation ... -
Longitudinal Variation of the Stratospheric Quasi-Biennial Oscillation
(American Meteorological Society, 2004)The longitudinal dependence of interannual variations of tropical stratospheric wind is examined in a detailed general circulation model simulation and in the limited observations available. A version of the SKYHI model ... -
A Mechanism and Simple Dynamical Model of the North Atlantic Oscillation and Annular Modes
(American Meteorological Society, 2004)A simple dynamical model is presented for the basic spatial and temporal structure of the large-scale modes of intraseasonal variability and associated variations in the zonal index. Such variability in the extratropical ... -
Inertia–Gravity Wave Generation by Balanced Motion: Revisiting the Lorenz–Krishnamurthy Model
(American Meteorological Society, 2004)The spontaneous generation of inertia?gravity waves by balanced motion at low Rossby number is examined using Lorenz's five-component model. The mostly numerical analysis by Lorenz and Krishnamurthy of a particular ... -
Time–Space Distribution of Long-Range Atmospheric Predictability
(American Meteorological Society, 2004)The global three-dimensional structure of long-range (one month to one season) atmospheric predictability was investigated with a general circulation model. The main focus was to ascertain the role of atmospheric initial ... -
Stratiform Precipitation, Vertical Heating Profiles, and the Madden–Julian Oscillation
(American Meteorological Society, 2004)The observed profile of heating through the troposphere in the Madden?Julian oscillation (MJO) is found to be very top heavy: more so than seasonal-mean heating and systematically more so than all of the seven models for ... -
Convective Entrainment into a Shear-Free, Linearly Stratified Atmosphere: Bulk Models Reevaluated through Large Eddy Simulations
(American Meteorological Society, 2004)Relationships between parameters of convective entrainment into a shear-free, linearly stratified atmosphere predicted by the zero-order jump and general-structure bulk models of entrainment are reexamined using data from ... -
Empirical Low-Order Models of Barotropic Flow
(American Meteorological Society, 2004)Empirical low-order models are constructed in the framework of a quasigeostrophic barotropic spectral model, truncated at T21. The spectral model is projected onto a linear subspace spanned by only a limited number of ... -
Exponentially Small Inertia–Gravity Waves and the Breakdown of Quasigeostrophic Balance
(American Meteorological Society, 2004)The spontaneous generation of inertia?gravity waves by balanced motion is investigated in the limit of small Rossby number ? ? 1. Particular (sheared disturbance) solutions of the three-dimensional Boussinesq equations are ... -
Stratospheric Tracer Spectra
(American Meteorological Society, 2004)The combined effects of advection and diffusion on the equilibrium spatial structure of a tracer whose spatial variation is maintained by a large-scale forcing are considered. Motivated by the lower stratosphere, the flow ... -
The Influence of Physical Processes on Extratropical Singular Vectors
(American Meteorological Society, 2004)An investigation is made of the impact of a full linearized physical (moist) parameterization package on extratropical singular vectors (SVs) using the ECMWF integrated forecasting system (IFS). Comparison is made for one ... -
Synoptic View of the North Atlantic Oscillation
(American Meteorological Society, 2004)This article investigates the synoptic characteristics of individual North Atlantic Oscillation (NAO) events by examining the daily evolution of the potential temperature field on the nominal tropopause (the 2-PVU surface). ... -
A Study of the Aerosol Effect on a Cloud Field with Simultaneous Use of GCM Modeling and Satellite Observation
(American Meteorological Society, 2004)The indirect effect of aerosols was simulated by a GCM for nonconvective water clouds and was compared with remote sensing results from the Advanced Very High Resolution Radiometer (AVHRR) satellite-borne sensor for January, ... -
Is the North Atlantic Oscillation a Breaking Wave?
(American Meteorological Society, 2004)Given the recent observational evidence that the positive (negative) phase of the North Atlantic Oscillation (NAO) is the remnant of anticyclonic (cyclonic) wave breaking, this study uses a multilevel primitive equation ... -
On the Ability of Dry Tropical-Cyclone-like Vortices to Withstand Vertical Shear
(American Meteorological Society, 2004)The ability of dry tropical-cyclone-like vortices to resist vertical shear is discussed. An idealized model calculation is presented in which a dry vortex remains nearly upright during 4 days under the influence of ... -
Forced Waves on a Zonally Aligned Jet Stream
(American Meteorological Society, 2004)The potential vorticity (PV) pattern in the vicinity of the jet stream takes the form of a narrow tube of enhanced PV gradient on the in situ isentropic surfaces. It is asserted that this distinctive structure can serve ... -
The Resolution Dependence of Model Physics: Illustrations from Nonhydrostatic Model Experiments
(American Meteorological Society, 2004)The goal of this paper is to gain insight into the resolution dependence of model physics, the parameterization of moist convection in particular, which is required for accurately predicting large-scale features of the ... -
Assimilation of Standard and Targeted Observations within the Unstable Subspace of the Observation–Analysis–Forecast Cycle System
(American Meteorological Society, 2004)In this paper it is shown that the flow-dependent instabilities that develop within an observation?analysis?forecast (OAF) cycle and that are responsible for the background error can be exploited in a very simple way to ...