Journal of the Atmospheric Sciences: Recent submissions
Now showing items 801-820 of 13215
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Radiation-Induced Condensational Growth and Cooling of Cloud-Sized Mist Droplets
(American Meteorological Society, 2020)A laboratory-experimental and theoretical-modeling investigation was conducted of isobaric, radiative cooling of cloud-like water mists to a remote heat sink, similar to what can happen at the tops of clouds. For mist ... -
Detecting Regime Transitions of the Nocturnal and Polar Near-Surface Temperature Inversion
(American Meteorological Society, 2020)Many natural systems undergo critical transitions, i.e., sudden shifts from one dynamical regime to another. In the climate system, the atmospheric boundary layer can experience sudden transitions between fully turbulent ... -
Nonlinear Forecast Error Growth of Rapidly Intensifying Hurricane Harvey (2017) Examined through Convection-permitting Ensemble Assimilation of GOES-16 All-sky Radiances
(American Meteorological Society, 2020)The dynamics and predictability of the rapid intensification (RI) of Hurricane Harvey (2017) were examined using convection-permitting initialization, analysis, and prediction from a cycling ensemble Kalman filter (EnKF) ... -
Evaluations of the Thermodynamic Phases of Clouds in a Cloud-System-Resolving Model Using CALIPSO and a Satellite Simulator over the Southern Ocean
(American Meteorological Society, 2020)A new evaluation method for the thermodynamic phases of clouds in cloud-system-resolving models is presented using CALIPSO observations and a satellite simulator. This method determines the thermodynamic phases using the ... -
Bin-Emulating Hail Melting in Three-Moment Bulk Microphysics
(American Meteorological Society, 2020)A three-moment bulk microphysics scheme is modified to treat melting in a size-dependent manner that emulates results from a spectral bin scheme. The three-moment bulk framework allows the distribution shape to change and ... -
Improvements in Supercooled Liquid Water Simulations of Low-Level Mixed-Phase Clouds over the Southern Ocean Using a Single-Column Model
(American Meteorological Society, 2020)A high-resolution global atmospheric model, the nonhydrostatic icosahedral atmospheric model (NICAM), exhibited underestimation biases in low-level mixed-phase clouds in the midlatitudes and polar regions. The ice-cloud ... -
Factor Effects in Numerical Simulations
(American Meteorological Society, 2020)Numerical simulations allow users to adjust factor settings in experimental runs to understand how changes in those factors affect the output. However, it is not straightforward to analyze these outputs when multiple input ... -
New Modified and Extended Stability Functions for the Stable Boundary Layer based on SHEBA and Parametrizations of Bulk Transfer Coefficients for Climate Models
(American Meteorological Society, 2020)Climate models still have deficits in reproducing the surface energy and momentum budgets in Arctic regions. One of the reasons is that currently used transfer coefficients occurring in parameterizations of the turbulent ... -
Coastal Stratocumulus Dissipation Dependence on Initial Conditions and Boundary Forcings in a Mixed-Layer Model
(American Meteorological Society, 2020)The impact of initial states and meteorological variables on stratocumulus cloud dissipation time over coastal land is investigated using a mixed-layer model. A large set of realistic initial conditions and forcing parameters ... -
Impact of Convectively Generated Low-Frequency Gravity Waves on Evolution of Mesoscale Convective Systems
(American Meteorological Society, 2020)Idealized numerical simulations of mesoscale convective systems (MCSs) over a range of instabilities and shears were conducted to examine low-frequency gravity waves generated during initial and mature stages of convection. ... -
Thermal Chains and Entrainment in Cumulus Updrafts. Part II: Analysis of Idealized Simulations
(American Meteorological Society, 2020)Research has suggested that the structure of deep convection often consists of a series of rising thermals, or “thermal chain,” which contrasts with existing conceptual models that are used to construct cumulus parameterizations. ... -
Thermal Chains and Entrainment in Cumulus Updrafts. Part I: Theoretical Description
(American Meteorological Society, 2020)Recent studies have shown that cumulus updrafts often consist of a succession of discrete rising thermals with spherical vortex-like circulations. In this paper, a theory is developed for why this “thermal chain” structure ... -
A Second-Order Closure Turbulence Model: New Heat Flux Equations and No Critical Richardson Number
(American Meteorological Society, 2020)We formulate a new second-order closure turbulence model by employing a recent closure for the pressure–temperature correlation at the equation level. As a result, we obtain new heat flux equations that avoid the long-standing ... -
Size and Structure of Dry and Moist Reversible Tropical Cyclones
(American Meteorological Society, 2020)The size and structure of tropical cyclones (TCs) are investigated using idealized numerical simulations. Three simulations are conducted: a pure dry TC (DRY), a moist reversible TC (REV) with fallout of hydrometeors in ... -
Studying Scale Dependency of Aerosol Cloud Interactions using Multi-Scale Cloud Formulations
(American Meteorological Society, 2020)The WRF-ACI model configuration is used to investigate the scale dependency of aerosol-cloud interactions (ACI) across the “grey zone” scales for grid and subgrid-scale clouds. The impacts of ACI on weather are examined ... -
Cloud-Top Entrainment in Mixed-Phase Stratocumulus and its Process-Level Representation in Large-Eddy Simulation
(American Meteorological Society, 2020)Cloud-top entrainment is a crucial process for the evolution of Stratocumulus and is driven by interactions of radiation, microphysics, and turbulence on scales reaching down to less than one meter. Regardless of this fact, ... -
Multiple Environmental Influences on the Lightning of Cold-Based Continental Cumulonimbus Clouds. Part I: Description and Validation of Model
(American Meteorological Society, 2020)In this two-part paper, influences from environmental factors on lightning in a convective storm are assessed with a model. In Part I, an electrical component is described and applied in the Aerosol-Cloud model (AC). AC ... -
Ensemble Sensitivity Analysis of Tropical Cyclone Intensification Rate during the Development Stage
(American Meteorological Society, 2020)Ensemble sensitivity analysis based on convective-permitting ensemble simulations is used to understand the processes associated with tropical cyclone (TC) intensification under idealized conditions. Partial correlations ... -
The influence of terrain on the convective environment and associated convective morphology from an idealized modeling prospective
(American Meteorological Society, 2020)Orographic deep convection (DC) initiation and rapid evolution from supercells to mesoscale convective systems (MCS) are common near the Sierras de Cόrdoba, Argentina, which was the focal point of the Remote Sensing of ... -
Convective Coupling in Tropical-Depression-Type Waves. Part II: Moisture and Moist Static Energy Budgets
(American Meteorological Society, 2020)The companion of this paper, Part I, discovered the characteristics of the rainfall progression in tropical-depression (TD)-type waves over the western North Pacific. In Part II, the large-scale controls on the convective ...