Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1241-1260 of 13215
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Large-Eddy Simulation of Shallow Cumulus over Land: A Composite Case Based on ARM Long-Term Observations at Its Southern Great Plains Site
(American Meteorological Society, 2017)AbstractBased on long-term observations by the Atmospheric Radiation Measurement program at its Southern Great Plains site, a new composite case of continental shallow cumulus (ShCu) convection is constructed for large-eddy ... -
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(American Meteorological Society, 2017)AbstractTo understand the slow eastward propagation of the Madden?Julian oscillation (MJO), the authors propose a new mechanism of slow eastward propagation of an unstable disturbance [slow eastward-propagating disturbance ... -
Closed-Form Analytic Solution of Cloud Dissipation for a Mixed-Layer Model
(American Meteorological Society, 2017)AbstractStratocumulus clouds play an important role in climate cooling and are hard to predict using global climate and weather forecast models. Thus, previous studies in the literature use observations and numerical ... -
Dynamics of Cloud-Top Generating Cells in Winter Cyclones. Part III: Shear and Convective Organization
(American Meteorological Society, 2017)AbstractCloud-top generating cells (GCs) are a common feature atop stratiform clouds within the comma head of winter cyclones. The dynamics of cloud-top GCs are investigated using very high-resolution idealized WRF Model ... -
Balanced Response of an Axisymmetric Tropical Cyclone to Periodic Diurnal Heating
(American Meteorological Society, 2017)AbstractA modified version of the Sawyer?Eliassen equation is applied to determine the impact of periodic diurnal heating on a balanced vortex. The TC diurnal cycle is a coherent signal that arises in the cirrus canopy. ... -
Multiscale Dynamical Processes Underlying the Wintertime Atlantic Blockings
(American Meteorological Society, 2017)AbstractThe wintertime atmospheric blocking over the Atlantic is investigated using a newly developed methodology?namely, localized multiscale energy and vorticity analysis (MS-EVA)?and the theory of canonical energy ... -
Ice Multiplication by Breakup in Ice–Ice Collisions. Part II: Numerical Simulations
(American Meteorological Society, 2017)AbstractIn Part I of this two-part paper, a formulation was developed to treat fragmentation in ice?ice collisions. In the present Part II, the formulation is implemented in two microphysically advanced cloud models ... -
The Possible Role of Density Current Dynamics in the Generation of Low-Level Vertical Vorticity in Supercells
(American Meteorological Society, 2017)AbstractA physical mechanism based on density current dynamics is proposed to explain the generation of low-level vertical vorticity in supercells. This mechanism may serve as one explanation for the associative relationship ... -
Gross Moist Stability Analysis: Assessment of Satellite-Based Products in the GMS Plane
(American Meteorological Society, 2017)AbstractNew diagnostic applications of the gross moist stability (GMS) are proposed with demonstrations using satellite-based data. The plane of the divergence of column moist static energy (MSE) against the divergence of ... -
Structure and Maintenance Mechanism of Long-Lived Concentric Eyewalls Associated with Simulated Typhoon Bolaven (2012)
(American Meteorological Society, 2017)AbstractTyphoons with long-lived concentric eyewalls (CEs) are more intense than those with short-lived CEs. It is important for more accurate prediction of typhoon intensity to understand the maintenance mechanism of the ... -
A Unified Formulation of Radiative Transfer in Plane-Parallel Atmospheres Based on General Decomposition of Radiance. Part I: The Theory
(American Meteorological Society, 2017)AbstractA unified formulation of the general decomposition of radiance and the radiative transfer equation (RTE) of plane-parallel atmospheres and the general solutions of the generally decomposed RTE system (GD-RTES) are ... -
A Diagnosis of Excessive Mixing in Smagorinsky Subfilter-Scale Turbulent Kinetic Energy Models
(American Meteorological Society, 2017)AbstractLarge-eddy simulation (LES) models are widely used to study atmospheric turbulence. The effects of small-scale motions that cannot be resolved need to be modeled by a subfilter-scale (SFS) model. The SFS contribution ... -
Influence of the Stratospheric Quasi-Biennial Oscillation on the Madden–Julian Oscillation during Austral Summer
(American Meteorological Society, 2017)AbstractInfluence of the stratospheric quasi-biennial oscillation (QBO) on the Madden?Julian oscillation (MJO) and its statistical significance are examined for austral summer (DJF) in neutral ENSO events during 1979?2013. ... -
A Physically Based Autoconversion Parameterization
(American Meteorological Society, 2017)AbstractA physically based parameterization for the autoconversion is derived by solving the stochastic collection equation (SCE) with an approximated collection kernel. The collection kernel is constructed using the ... -
Comments on “Dynamics of Upper-Level Frontogenesis in Baroclinic Waves”
(American Meteorological Society, 2016)AbstractA recent paper by Mak et al. grants the opportunity to discuss two different definitions of the frontogenetical function proposed in the literature to study the formation and evolution of upper-level fronts. This ... -
Positive and Negative Eddy Feedbacks Acting on Midlatitude Jet Variability in a Three-Level Quasigeostrophic Model
(American Meteorological Society, 2017)AbstractThe variability of midlatitude jets is investigated in a long-term integration of a dry three-level quasigeostrophic model on the sphere. As for most observed jets, the leading EOF of the zonal-mean wind corresponds ... -
On the Formulation and Universality of Monin–Obukhov Similarity Functions for Mean Gradients and Standard Deviations in the Unstable Surface Layer: Results from Surface-Layer-Resolving Large-Eddy Simulations
(American Meteorological Society, 2017)AbstractSurface-layer-resolving large-eddy simulations (LESs) of free-convective to near-neutral boundary layers are used to study Monin?Obukhov similarity theory (MOST) functions. The LES dataset, previously used for the ... -
Suppression of Arctic Air Formation with Climate Warming: Investigation with a Two-Dimensional Cloud-Resolving Model
(American Meteorological Society, 2017)AbstractArctic climate change in winter is tightly linked to changes in the strength of surface temperature inversions, which occur frequently in the present climate as Arctic air masses form during polar night. Recent ... -
Reduction of the Entrainment Velocity by Cloud Droplet Sedimentation in Stratocumulus
(American Meteorological Society, 2016)AbstractThe effect of sedimentation on stratocumulus entrainment is investigated using direct numerical simulations of a cloud-top mixing layer driven by radiative and evaporative cooling. The simulations focus on the meter ... -
A Microphysical Analysis of Elevated Convection in the Comma Head Region of Continental Winter Cyclones
(American Meteorological Society, 2016)AbstractAn analysis of the microphysical structure of elevated convection within the comma head region of two winter cyclones over the midwestern United States is presented using data from the Wyoming Cloud Radar (WCR) and ...