Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4181-4200 of 13215
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Tropospheric Rossby Wave Breaking and the NAO/NAM
(American Meteorological Society, 2008)Objective analysis of several hundred thousand anticyclonic and cyclonic breaking Rossby waves is performed for the Northern Hemisphere (NH) winters of 1958?2006. A winter climatology of both anticyclonic and cyclonic ... -
A Dual Mass Flux Framework for Boundary Layer Convection. Part I: Transport
(American Meteorological Society, 2009)This study considers the question of what is the least complex bulk mass flux framework that can still conceptually reproduce the smoothly varying coupling between the shallow convective cloud layer and the subcloud mixed ... -
A Wavelet Representation of Synoptic-Scale Coherent Structures
(American Meteorological Society, 2008)Midlatitude cyclogenesis as interpreted in the framework of either baroclinic development or potential vorticity thinking heavily relies on the concept of synoptic-scale anomaly. Given the existence of potential vorticity ... -
Revisiting Low and List (1982): Evaluation of Raindrop Collision Parameterizations Using Laboratory Observations and Modeling
(American Meteorological Society, 2008)Raindrop collision and breakup is a stochastic process that affects the evolution of drop size distributions (DSDs) in precipitating clouds. Low and List have remained the obligatory reference on this matter for almost ... -
A Study of the Probability of Clear Line of Sight through Single-Layer Cumulus Cloud Fields in the Tropical Western Pacific
(American Meteorological Society, 2008)The plane-parallel horizontal (PPH) hypothesis used to approximate clouds in GCMs neglects three-dimensional cloud effects. Such effects can amount to as much as 20 W m?2 in longwave radiation. Several investigators have ... -
Seasonal Influence of the Quasi-Biennial Oscillation on Stratospheric Jets and Rossby Wave Breaking
(American Meteorological Society, 2009)The influence of the stratospheric quasi-biennial oscillation (QBO) on the polar night jets (PNJs), subtropical easterly jets (SEJs), and associated Rossby wave breaking (RWB) is investigated using global meteorological ... -
Giant Sea-Salt Aerosols and Warm Rain Formation in Marine Stratocumulus
(American Meteorological Society, 2008)The concentrations and sizes of smaller aerosols (radius smaller than 0.5 ?m) in the marine atmosphere vary owing to natural and anthropogenic factors. The concentrations and sizes of giant and ultragiant aerosols vary ... -
Shepard and Hardy Multiquadric Interpolation Methods for Multicomponent Aerosol–Cloud Parameterization
(American Meteorological Society, 2009)This paper presents a novel method based on the application of interpolation techniques to the multicomponent aerosol?cloud parameterization for global climate modeling. Quantifying the aerosol indirect effect still remains ... -
The Potential for Improved Boundary Layer Cloud Optical Depth Retrievals from the Multiple Directions of MISR
(American Meteorological Society, 2008)The Multiangle Imaging Spectroradiometer (MISR) views the earth with nine cameras, ranging from a 70° zenith angle viewing forward through nadir to 70° viewing aft. MISR does not have an operational cloud optical depth ... -
A Method to Find Perturbations That Trigger Blocking Onset: Conditional Nonlinear Optimal Perturbations
(American Meteorological Society, 2008)In this paper the following question is addressed: assuming that some information is available about initial perturbations (e.g., that they belong to an ensemble, which consists of the perturbations whose magnitudes are ... -
Formation of Jets by Baroclinic Turbulence
(American Meteorological Society, 2008)Turbulent fluids are frequently observed to spontaneously self-organize into large spatial-scale jets; geophysical examples of this phenomenon include the Jovian banded winds and the earth?s polar-front jet. These relatively ... -
Entrainment in Cumulus Clouds: What Resolution is Cloud-Resolving?
(American Meteorological Society, 2008)Systematic numerical experiments were conducted to determine the spatial resolution required to resolve a moist thermal show convergence at a scale proportional to the smaller of the initial thermal diameter D0 and a ... -
The Spectral Ice Habit Prediction System (SHIPS). Part II: Simulation of Nucleation and Depositional Growth of Polycrystals
(American Meteorological Society, 2008)This paper proposes a framework to predict polycrystals along with hexagonal monocrystals in a cloud-resolving model and discusses validity of the scheme and physical processes important for habit distribution by implementing ... -
Kinetics of Cloud Drop Formation and Its Parameterization for Cloud and Climate Models
(American Meteorological Society, 2008)To study the kinetics of drop nucleation in clouds, the integro?differential equation for integral water supersaturation in cloud is derived and analyzed. Solving the supersaturation equation with an algebraic form of the ... -
Genesis of Tropical Storm Eugene (2005) from Merging Vortices Associated with ITCZ Breakdowns. Part I: Observational and Modeling Analyses
(American Meteorological Society, 2008)Although tropical cyclogenesis occurs over all tropical warm ocean basins, the eastern Pacific appears to have the highest frequency of tropical cyclogenesis events per unit area. In this study, tropical cyclogenesis from ... -
Barotropic Regeneration of Upper-Level Synoptic Disturbances in Different Configurations of the Zonal Weather Regime
(American Meteorological Society, 2008)Barotropic dynamics of upper-tropospheric midlatitude disturbances evolving in different configurations of the zonal weather regime (i.e., in different zonal-like large-scale flows) were studied using observational analyses ... -
Coexisting Turbulent Climate Attractors in a Two-Layer Quasigeostrophic Model
(American Meteorological Society, 2008)An intriguing manifestation of the underlying nonlinear fluid dynamic character of the atmosphere is found in an idealized quasigeostrophic model of the troposphere. For identical forcing and dissipation, the model?s climate ... -
On the Parameterization of Evaporation of Raindrops as Simulated by a One-Dimensional Rainshaft Model
(American Meteorological Society, 2008)The process of evaporation of raindrops below cloud base is investigated by numerical simulations using a one-dimensional rainshaft model with bin microphysics. The simulations reveal a high variability of the shape of the ... -
Relative Humidity as an Indicator for Cloud Formation over Heterogeneous Land Surfaces
(American Meteorological Society, 2008)The influence of land surface heterogeneity on potential cloud formation is investigated using relative humidity as an indicator. This is done by performing numerical experiments using a large-eddy simulation model (LES). ... -
A Probabilistic Analysis of the Dynamics and Predictability of Tropical Cyclogenesis
(American Meteorological Society, 2008)Using methods unique for tropical cyclone studies in peer-reviewed literature, this study examines the dynamics and predictability of a nondeveloping tropical disturbance in the Gulf of Mexico during the 2004 hurricane ...