Journal of the Atmospheric Sciences: Recent submissions
Now showing items 721-740 of 13215
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A nonlinear multi-scale theory of atmospheric blocking: Eastward and upward propagation and energy dispersion of tropospheric blocking wave packet
(American Meteorological Society, 2020)In this paper, a nonlinear multi-scale interaction model is used to examine how the planetary waves associated with eddy-driven blocking wave packets propagate through the troposphere in vertically varying weak baroclinic ... -
Mountain waves produced by a stratified shear flow with a boundary layer. Part II: Form drag, wave drag, and transition from downstream sheltering to upstream blocking
(American Meteorological Society, 2020)The non-hydrostatic version of the mountain flow theory presented in Part I is detailed. In the near neutral case, the surface pressure decreases when the flow crosses the mountain to balance an increase in surface friction ... -
Piecewise potential vorticity inversion without far-field response?
(American Meteorological Society, 2020)Given a flow domain D with subdomains D1 and D2, piecewise potential vorticity inversion (PPVI) inverts a potential vorticity (PV) anomaly in D2 and assumes vanishing PV in D1 where boundary conditions must be taken into ... -
The Initiation of Dry Patches in Cloud Resolving Convective Self-aggregation Simulations: Boundary Layer “Dry-subsidence” Feedback
(American Meteorological Society, 2020)Self-aggregation of convection can be considered as the simultaneous occurrence of dry patch initiation/amplification and wet patch contraction/intensification from initially uniform moisture and temperature fields. As the ... -
Smoke With Induced Rotation and Lofting (SWIRL) in the Stratosphere
(American Meteorological Society, 2020)The Australian bushfires of 2019/20 produced an unusually large number of pyrocumulonimbus (pyroCb) that injected huge amounts of smoke into the lower stratosphere. The pyroCbs from 29 December - 4 January were particularly ... -
How Snow Aggregate Ellipsoid Shape and Orientation Variability Affects Fall Speed and Self-Aggregation Rates
(American Meteorological Society, 2020)Snow aggregate shapes and orientations have long been known to exhibit substantial variability. Despite this observed variability, most weather and climate prediction models use fixed power-law functions that deterministically ... -
The Relative Importance of Updraft and Cold Pool Characteristics on Supercell Tornadogenesis in Highly Idealized Simulations
(American Meteorological Society, 2020)In the recent literature, the conception has emerged that supercell tornado potential may mostly depend on the strength of the low-level updraft, with more than sufficient subtornadic vertical vorticity being assumed to ... -
The Compressional Beta Effect: Analytical Solution, Numerical Benchmark, and Data Analysis
(American Meteorological Society, 2020)This study derives a complete set of equatorially confined wave solutions from an anelastic equation set with the complete Coriolis terms, which include both the vertical and meridional planetary vorticity. The propagation ... -
Environmental controls on tropical mesoscale convective system precipitation intensity
(American Meteorological Society, 2020)Using multiple independent satellite and reanalysis datasets, we compare relationships between mesoscale convective system (MCS) precipitation intensity (Pmax), environmental moisture, large-scale vertical velocity, and ... -
Application of the IDEMIX Concept for Internal Gravity Waves in the Atmosphere
(American Meteorological Society, 2020)The model Internal Wave Dissipation, Energy and Mixing (IDEMIX) presents a novel way of parameterizing internal gravity waves in the atmosphere. IDEMIX is based on the spectral energy balance of the wave field and has ... -
A Formula for the Maximum Vertical Velocity in Supercell Updrafts
(American Meteorological Society, 2020)In supercell environments, previous authors have shown strong connections between the vertical wind shear magnitude, updraft width, and entrainment. Based on these results, it is hypothesized that the influences of ... -
Comparison of Eulerian bin and Lagrangian particle-based microphysics in simulations of nonprecipitating cumulus
(American Meteorological Society, 2020)A single nonprecipitating cumulus congestus setup is applied to compare droplet spectra grown by the diffusion of water vapor in Eulerian bin and particle-based Lagrangian microphysics schemes. Bin microphysics represent ... -
Drop Size Distribution Broadening Mechanisms in a Bin Microphysics Eulerian Model
(American Meteorological Society, 2020)In this study, processes that broaden drop size distributions (DSDs) in Eulerian models with two-moment bin microphysics are analyzed. Numerous tests are performed to isolate the effects of different physical mechanisms ... -
Environment and Mechanisms of Severe Turbulence in a Midlatitude Cyclone
(American Meteorological Society, 2020)A large midlatitude cyclone occurred over the central United States from 0000 to 1800 UTC 30 April 2017. During this period, there were more than 1100 reports of moderate-or-greater turbulence at commercial aviation cruising ... -
Interactive Radiation Accelerates the Intensification of the Mid-level Vortex for Tropical Cyclogenesis
(American Meteorological Society, 2020)Interactive radiation helps accelerate tropical cyclogenesis, but the mechanism is still unclear. Using idealized numerical modeling in the radiative-convective equilibrium framework, it is revealed that interactive radiation ... -
Diffusive–Nondiffusive Flux Decompositions in Atmospheric Boundary Layers
(American Meteorological Society, 2020)Eddy diffusivity models are a common method to parameterize turbulent fluxes in the atmospheric sciences community. However, their inability to handle convective boundary layers leads to the addition of a nondiffusive flux ... -
Frictionally Induced Feedback in a Reduced Dynamical Model of Tropical Cyclone Intensification
(American Meteorological Society, 2020)This study examines the role of frictional feedback in the atmospheric boundary layer during tropical cyclone (TC) development. Using a reduced model of TC dynamics, it is shown that a feedback between frictional convergence ... -
Interpreting and Stabilizing Machine-learning Parametrizations of Convection
(American Meteorological Society, 2020)Neural networks are a promising technique for parameterizing sub-grid-scale physics (e.g. moist atmospheric convection) in coarse-resolution climate models, but their lack of interpretability and reliability prevents ... -
Secondary Ice Production upon Freezing of Freely Falling Drizzle Droplets
(American Meteorological Society, 2020)Ice multiplication processes are known to be responsible for the higher concentration of ice particles versus ice nucleating particles in clouds, but the exact secondary ice formation mechanisms remain to be quantified. ... -
Description of Atmospheric Aerosol Dynamics Using an Inverse Gaussian Distributed Method of Moments
(American Meteorological Society, 2020)For nearly 60 years, the lognormal distribution has been the most widely used function in the field of atmospheric science for characterizing atmospheric aerosol size distribution. We verify whether the three-parameter ...