Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4521-4540 of 13215
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Analytic Representation of the Large-Scale Organization of Tropical Convection
(American Meteorological Society, 2004)The pivotal role of mesoscale organization on the large-scale coherence of tropical convection is represented by a nonlinear dynamical model. The general model consists of two interlocked systems: a mesoscale parameterization ... -
Combined Dynamics of Boundary and Interior Perturbations in the Eady Setting
(American Meteorological Society, 2004)A theoretical study is undertaken of the relative influence of intermediate-level, near-surface, and tropopause-level perturbations upon flow development and cyclogenesis. The study is based upon two complementary ... -
Simple Models of the Role of Surface Fluxes in Convective Cold Pool Evolution
(American Meteorological Society, 2004)Gravity-current models have been used for many years to describe the cold pools of low-level air that are generated by cumulonimbus precipitation. More recently, it has been realized that surface fluxes of heat and water ... -
Parameterization of the Autoconversion Process.Part I: Analytical Formulation of the Kessler-Type Parameterizations
(American Meteorological Society, 2004)Various commonly used Kessler-type parameterizations of the autoconversion of cloud droplets to embryonic raindrops are theoretically derived from the same formalism by applying the generalized mean value theorem for ... -
HATS: Field Observations to Obtain Spatially Filtered Turbulence Fields from Crosswind Arrays of Sonic Anemometers in the Atmospheric Surface Layer
(American Meteorological Society, 2004)The Horizontal Array Turbulence Study (HATS) field program utilized horizontal, crosswind arrays of sonic anemometers to calculate estimates of spatially filtered and subfilter-scale (SFS) turbulence, corresponding to its ... -
Retrieval of Microscale Flow Structures from High-Resolution Doppler Lidar Data Using an Adjoint Model
(American Meteorological Society, 2004)Radial velocity data measured by high-resolution Doppler lidar (HRDL) are assimilated with a four-dimensional variational data assimilation (4DVAR) method to retrieve microscale flow structures in an atmospheric boundary ... -
Why Do Baroclinic Waves Tilt Poleward with Height?
(American Meteorological Society, 2004)Theoretical and modeling studies of nongeostrophic effects in baroclinic waves predict that baroclinic waves should tilt poleward with height, with a larger tilt in total meridional wind than in geostrophic quantities. ... -
A Vector Derivation of the Semigeostrophic Potential Vorticity Equation
(American Meteorological Society, 2004)The semigeostrophic potential vorticity equation is derived in a vector-based notation for the shallow-water and primitive equations, as models for atmospheric flow. The derivation proceeds from knowledge of the functional ... -
Baroclinic Equilibration and the Maintenance of the Momentum Balance.Part I: A Barotropic Analog
(American Meteorological Society, 2004)In this two-paper series the basic dynamics concerning the equilibration of a baroclinic jet are described, using as a reference the simple Charney?Boussinesq model. Though this problem has been studied in the past in more ... -
The Role of the Nonlocal Transport in Modeling the Shear-Driven Atmospheric Boundary Layer
(American Meteorological Society, 2004)In this work the role played by the transport equations including nonlocal terms in simulating the atmospheric turbulence is investigated. Two different models are compared: the first one is a standard E?ε model solving ... -
A Cautionary Note on the Use of Meteorological Analysis Fields for Quantifying Atmospheric Mixing
(American Meteorological Society, 2004)Offline atmospheric transport models are normally driven with meteorological analyses. However, subsequent analysis fields are dynamically not consistent with each other, because they are produced in independent data ... -
Baroclinic Equilibration and the Maintenance of the Momentum Balance.Part II: 3D Results
(American Meteorological Society, 2004)In this two-paper series the equilibration of a baroclinic jet is described, emphasizing the redistribution of momentum and the effects that this redistribution has on the steering level and the potential vorticity (PV) ... -
A Local Model for Planetary Atmospheres Forced by Small-Scale Convection
(American Meteorological Society, 2004)An equivalent-barotropic fluid on the ? plane, forced at small scales by random stirring and dissipated by linear heat and vorticity drag, is considered as a local model for flow in the weather layer of internally forced ... -
Kelvin–Helmholtz Instability of Potential Vorticity Layers: A Route to Mixing
(American Meteorological Society, 2004)The linear and nonlinear dynamics of layers of anomalously high potential vorticity (PV) are studied in detail. It is well known that PV layers are subject to slow, balanced, mixed barotropic?baroclinic instabilities. In ... -
A Mechanism for Atmospheric Regime Behavior
(American Meteorological Society, 2004)Adopting the viewpoint that atmospheric flow regimes can be associated with steady states, this work investigates the hypothesis that regime transitions in deterministic atmosphere models are related to the existence of ... -
A Linear Theory of Orographic Precipitation
(American Meteorological Society, 2004)A linear theory of orographic precipitation is developed, including airflow dynamics, condensed water advection, and downslope evaporation. The formulation extends the widely used ?upslope? model. Vertically integrated ... -
The Tropical Dynamical Response to Latent Heating Estimates Derived from the TRMM Precipitation Radar
(American Meteorological Society, 2004)A 3-yr (1998?2000) climatology of near-surface rainfall and stratiform rain fraction observed by the Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) was used to calculate the four-dimensional distribution ... -
The Generation of the Morning Glory
(American Meteorological Society, 2004)A high-resolution cloud model is used to explore in detail the generation of the morning glory, a low-level nonlinear atmospheric internal wave observed on the southwestern side of Cape York Peninsula (Australia). The model ... -
Internal Waves in a Lagrangian Reference Frame
(American Meteorological Society, 2004)Several recent studies of internal gravity waves have been expressed in a Lagrangian reference frame, motivated by the observation that in this frame the dispersion relation then excludes the Eulerian Doppler shifting term ... -
Mountain Torques and Northern Hemisphere Low-Frequency Variability. Part I: Hemispheric Aspects
(American Meteorological Society, 2004)The NCEP?NCAR reanalysis dataset for 1958?97 is used to analyze intraseasonal variations in mountain torques and the large-scale atmospheric circulation patterns associated with them. Spectral analysis of the atmospheric ...