Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1581-1600 of 13215
-
On Averaging Aspect Ratios and Distortion Parameters over Ice Crystal Population Ensembles for Estimating Effective Scattering Asymmetry Parameters
(American Meteorological Society, 2015)he use of ensemble-average values of aspect ratio and distortion parameter of hexagonal ice prisms for the estimation of ensemble-average scattering asymmetry parameters is evaluated. Using crystal aspect ratios greater ... -
Secondary Eyewall Formation in an Idealized Tropical Cyclone Simulation: Balanced and Unbalanced Dynamics
(American Meteorological Society, 2016)he secondary eyewall formation (SEF) in an idealized simulation of a tropical cyclone (TC) is examined from the perspective of both the balanced and unbalanced dynamics and through the tangential wind (Vt) budget analysis. ... -
Exploring Stratocumulus Cloud-Top Entrainment Processes and Parameterizations by Using Doppler Cloud Radar Observations
(American Meteorological Society, 2015)bservations made at the Atmospheric Radiation Measurement (ARM) Program?s Southern Great Plains (SGP) site during uniform nonprecipitating stratocumulus cloud conditions for a 14-h period are used to examine cloud-top ... -
Reasons for the Extremely High-Ranging Planetary Boundary Layer over the Western Tibetan Plateau in Winter
(American Meteorological Society, 2016)he planetary boundary layer (PBL) over the Tibetan Plateau (with a mean elevation about 4 km above sea level) reaches an unmatched height of 9515 m above sea level. The proximity of this height to the tropopause facilitates ... -
Southern Hemisphere Extratropical Gravity Wave Sources and Intermittency Revealed by a Middle-Atmosphere General Circulation Model
(American Meteorological Society, 2015)outhern Hemisphere extratropical gravity wave activity is examined using simulations from a free-running middle-atmosphere general circulation model called Kanto that contains no gravity wave parameterizations. The total ... -
Physically Based Stochastic Perturbations (PSP) in the Boundary Layer to Represent Uncertainty in Convective Initiation
(American Meteorological Society, 2016)tochastic perturbations allow for the representation of small-scale variability due to unresolved physical processes. However, the properties of this variability depend on model resolution and weather regime. A physically ... -
Surface Stress over the Ocean in Swell-Dominated Conditions during Moderate Winds
(American Meteorological Society, 2015)tmospheric and surface wave data from several oceanic experiments carried out on the Floating Instrument Platform (FLIP) and the Air?Sea Interaction Spar (ASIS) have been analyzed with the purpose of identifying swell-related ... -
Effects of Saharan Dust on the Linear Dynamics of African Easterly Waves
(American Meteorological Society, 2015)he direct radiative effects of Saharan mineral dust aerosols on the linear dynamics of African easterly waves (AEWs) are examined analytically and numerically. The analytical analysis combines the thermodynamic equation ... -
Liquid–Ice Mass Partition in Tropical Maritime Convective Clouds
(American Meteorological Society, 2016)he liquid?ice mass partitioning in tropical maritime convective clouds is studied using data collected by the National Center for Atmospheric Research C-130 research aircraft during the Ice in Clouds Experiment?Tropical ... -
Intrinsic versus Practical Limits of Atmospheric Predictability and the Significance of the Butterfly Effect
(American Meteorological Society, 2016)imits of intrinsic versus practical predictability are studied through examining multiscale error growth dynamics in idealized baroclinic waves with varying degrees of convective instabilities. In the dry experiment free ... -
An Approach to Generating Mutually Independent Initial Perturbations for Ensemble Forecasts: Orthogonal Conditional Nonlinear Optimal Perturbations
(American Meteorological Society, 2015)onditional nonlinear optimal perturbation (CNOP) is the initial perturbation that satisfies a certain physical constraint and causes the largest nonlinear evolution at prediction time. To yield mutually independent initial ... -
Stratocumulus Cloud Clearings and Notable Thermodynamic and Aerosol Contrasts across the Clear–Cloudy Interface
(American Meteorological Society, 2015)ata from three research flights, conducted over water near the California coast, are used to investigate the boundary between stratocumulus cloud decks and clearings of different sizes. Large clearings exhibit a diurnal ... -
A Numerical Study of Convection in a Condensing CO2 Atmosphere under Early Mars-Like Conditions
(American Meteorological Society, 2016)loud convection of a CO2 atmosphere where the major constituent condenses is numerically investigated under a setup idealizing a possible warm atmosphere of early Mars, utilizing a two-dimensional cloud-resolving model ... -
Multipoint Monin–Obukhov Similarity and Its Application to Turbulence Spectra in the Convective Atmospheric Surface Layer
(American Meteorological Society, 2015)generalized Monin?Obukhov similarity hypothesis for the atmospheric surface layer is proposed. It employs the Monin?Obukhov length as a length scale in both the horizontal and vertical directions, in contrast to the original ... -
Enhanced Persistence of Equatorial Waves via Convergence Coupling in the Stochastic Multicloud Model
(American Meteorological Society, 2015)ecent observational and theoretical studies show a systematic relationship between tropical moist convection and measures related to large-scale convergence. It has been suggested that cloud fields in the column stochastic ... -
Dynamics of Cloud-Top Generating Cells in Winter Cyclones. Part II: Radiative and Instability Forcing
(American Meteorological Society, 2015)ecent field observations suggest that cloud-top precipitation generating cells (GCs) are ubiquitous in the warm-frontal and comma-head regions of midlatitude winter cyclones. The presence of fallstreaks emanating from the ... -
Eddy Activity Sensitivity to Changes in the Vertical Structure of Baroclinicity
(American Meteorological Society, 2015)he relation between the mean meridional temperature gradient and eddy fluxes has been addressed by several eddy flux closure theories. However, these theories give little information on the dependence of eddy fluxes on the ... -
A PDF-Based Formulation of Microphysical Variability in Cumulus Congestus Clouds
(American Meteorological Society, 2015)alculating unbiased microphysical process rates over mesoscale model grid volumes necessitates knowledge of the subgrid-scale (SGS) distribution of variables, typically represented as probability distribution functions ... -
New Statistical Model for Variability of Aerosol Optical Thickness: Theory and Application to MODIS Data over Ocean
(American Meteorological Society, 2015)novel model for the variability in aerosol optical thickness (AOT) is presented. This model is based on the consideration of AOT fields as realizations of a stochastic process that is the exponent of an underlying Gaussian ... -
Dynamics of Cloud-Top Generating Cells in Winter Cyclones. Part I: Idealized Simulations in the Context of Field Observations
(American Meteorological Society, 2015)his paper assesses the influence of radiative forcing and latent heating on the development and maintenance of cloud-top generating cells (GCs) in high-resolution idealized Weather Research and Forecasting Model simulations ...