Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1521-1540 of 13215
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Ice Nucleating Particle Measurements at 241 K during Winter Months at 3580 m MSL in the Swiss Alps
(American Meteorological Society, 2016)ce nucleating particle (INP) concentrations were measured at the High Altitude Research Station Jungfraujoch, Switzerland, 3580 m above mean sea level during the winter months of 2012, 2013, and 2014 with the Portable Ice ... -
Metamodeling of Droplet Activation for Global Climate Models
(American Meteorological Society, 2015)he nucleation of cloud droplets from the ambient aerosol is a critical physical process that must be resolved for global models to faithfully predict aerosol?cloud interactions and aerosol indirect effects on climate. To ... -
Momentum Balance and Eliassen–Palm Flux on Moist Isentropic Surfaces
(American Meteorological Society, 2015)revious formulations for the zonally averaged momentum budget and Eliassen?Palm (EP) flux diagnostics do not adequately account for moist dynamics, since air parcels are not differentiated by their moisture content when ... -
Mechanisms Contributing to Suppressed Precipitation in Mt. Hua of Central China. Part I: Mountain Valley Circulation
(American Meteorological Society, 2016)significant reduction in precipitation in the past decades has been documented over many mountain ranges such as those in central and eastern China. Consistent with the increase of air pollution in these regions, it has ... -
Factors Controlling Stratocumulus Cloud Lifetime over Coastal Land
(American Meteorological Society, 2016)he breakup of stratocumulus clouds over coastal land areas is studied using a combination of large-eddy simulations (LESs) and mixed-layer models (MLMs) with a focus on mechanisms regulating the timing of the breakup. In ... -
The Relationship between Equatorial Mixed Rossby–Gravity and Eastward Inertio-Gravity Waves. Part II
(American Meteorological Society, 2016)pace?time spectral analysis of tropical cloudiness data shows strong evidence that convectively coupled n = 0 mixed Rossby?gravity waves (MRGs) and eastward inertio-gravity waves (EIGs) occur primarily within the western/central ... -
The Relationship between Equatorial Mixed Rossby–Gravity and Eastward Inertio-Gravity Waves. Part I
(American Meteorological Society, 2016)he relationship between n = 0 mixed Rossby?gravity waves (MRGs) and eastward inertio-gravity waves (EIGs) from Matsuno?s shallow-water theory on an equatorial beta plane is studied using statistics of satellite brightness ... -
Seasonality of the Structure and Propagation Characteristics of the MJO
(American Meteorological Society, 2016)he seasonality of the Madden?Julian oscillation (MJO) is documented in observational data, and a nonlinear shallow-water model is used to help interpret some of the contrasts in MJO structure between the boreal winter ... -
Numerical Study of Motion and Stability of Falling Columnar Crystals
(American Meteorological Society, 2015)nderstanding of the flow field and falling patterns of ice crystals is fundamental to cloud physics and radiative transfer, and yet the complex shape hampers a comprehensive understanding. In order to create better ... -
Triple-Moment Modal Parameterization for the Adaptive Growth Habit of Pristine Ice Crystals
(American Meteorological Society, 2015)three-moment modal parameterization scheme was developed for describing variations in the shape of cloud ice crystals during growth by vapor deposition. The shape of ice crystals is represented using the volume-weighted ... -
A Lagrangian Study of Precipitation-Driven Downdrafts
(American Meteorological Society, 2015)recipitation-driven downdrafts are an important component of deep convective systems. They stabilize the atmosphere by injecting relatively cold and dry air into the boundary layer. They have also been invoked as responsible ... -
On the Upstream Track Deflection of Tropical Cyclones Past a Mountain Range: Idealized Experiments
(American Meteorological Society, 2016)pstream track deflection of a propagating cyclonic vortex past an isolated mountain range is investigated by using idealized simulations with both boundary layer turbulent mixing and cloud effects. The westbound vortex ... -
Large-Eddy Simulations of EUCLIPSE–GASS Lagrangian Stratocumulus-to-Cumulus Transitions: Mean State, Turbulence, and Decoupling
(American Meteorological Society, 2016)esults of four Lagrangian stratocumulus-to-shallow-cumulus transition cases as obtained from six different large-eddy simulation models are presented. The model output is remarkably consistent in terms of the representation ... -
Why is the Tropical Cyclone Boundary Layer Not “Well Mixed”?
(American Meteorological Society, 2015)lausible diagnostics for the top of the tropical cyclone boundary layer include (i) the top of the layer of strong frictional inflow and (ii) the top of the ?well mixed? layer, that is, the layer over which potential ... -
A New Look to the Generalized CAPE
(American Meteorological Society, 2016)determination of the generalized CAPE (GCAPE) is suggested where instead of an adiabatic reversible vertical redistribution of air in a conditionally unstable atmosphere, irreversible processes with regard to the water ... -
Expansion of a Holepunch Cloud by a Gravity Wave Front
(American Meteorological Society, 2015)holepunch cloud is a curious phenomenon where a disturbance in a thin cloud layer initiates an expanding circular hole of clear air. Usually triggered by the passage of aircraft, observations of these holes in clouds date ... -
Exploring the Role of Eddy Momentum Fluxes in Determining the Characteristics of the Equinoctial Hadley Circulation: Fixed-SST Simulations
(American Meteorological Society, 2016)he influence of eddy momentum fluxes on the equinoctial Hadley circulation is explored using idealized simulations on an equatorial beta plane in which the sea surface temperature (SST) distribution is fixed. By comparing ... -
Numerical Archetypal Parameterization for Mesoscale Convective Systems
(American Meteorological Society, 2015)ertical shear commonly organizes atmospheric convection into coherent multiscale structures. The associated countergradient vertical transport of horizontal momentum by organized convection can enhance the wind shear and ... -
Wave–Mean Flow Interactions and the Maintenance of Superrotation in a Terrestrial Atmosphere
(American Meteorological Society, 2016)he interplay between mean meridional circulation and transient eddies through wave?mean flow interaction processes defines the general behavior of any planetary atmospheric circulation. Under a higher-Rossby-number regime, ... -
Impact of Swell on Air–Sea Momentum Flux and Marine Boundary Layer under Low-Wind Conditions
(American Meteorological Society, 2016)he impact of fast-propagating swell on the air?sea momentum exchange and the marine boundary layer is examined based on multiple large-eddy simulations over a range of wind speed and swell parameters in the light-wind?fast-wave ...