Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1141-1160 of 13215
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Mountain-Wave Turbulence in the Presence of Directional Wind Shear over the Rocky Mountains
(American Meteorological Society, 2018)AbstractMountain-wave turbulence in the presence of directional wind shear over the Rocky Mountains in Colorado is investigated. Pilot reports (PIREPs) are used to select cases in which moderate or severe turbulence ... -
Turbulence Effects of Collision Efficiency and Broadening of Droplet Size Distribution in Cumulus Clouds
(American Meteorological Society, 2017)AbstractThis paper aims to investigate and quantify the turbulence effect on droplet collision efficiency and explore the broadening mechanism of the droplet size distribution (DSD) in cumulus clouds. The sophisticated ... -
The Role of Near-Core Convective and Stratiform Heating/Cooling in Tropical Cyclone Structure and Intensity
(American Meteorological Society, 2017)AbstractThe effects of convective and stratiform diabatic processes in the near-core region on tropical cyclone (TC) structure and intensity change are examined by artificially modifying the convective and stratiform ... -
Relationship between Aerosols, Hail Microphysics, and ZDR Columns
(American Meteorological Society, 2018)AbstractMechanisms of formation of differential reflectivity columns are investigated in simulations of a midlatitude summertime hailstorm with hailstones up to several centimeters in diameter. Simulations are performed ... -
Dynamic Multiscale Modes of Severe Storm Structure Detected in Mobile Doppler Radar Data by Entropy Field Decomposition
(American Meteorological Society, 2017)AbstractThe detection of complex spatially and temporally varying coherent structures in data from highly nonlinear and non-Gaussian systems is a challenging problem in a wide range of scientific disciplines. This is the ... -
Role of Surface Enthalpy Fluxes in Idealized Simulations of Tropical Depression Spinup
(American Meteorological Society, 2018)AbstractAn idealized, three-dimensional, cloud-system-resolving model is used to investigate the influence of surface enthalpy flux variations on tropical depression (TD) spinup, an early stage of tropical cyclogenesis in ... -
Computation and Characterization of Local Subfilter-Scale Energy Transfers in Atmospheric Flows
(American Meteorological Society, 2018)AbstractAtmospheric motions are governed by turbulent motions associated to nontrivial energy transfers at small scales (direct cascade) and/or at large scales (inverse cascade). Although it is known that the two cascades ... -
Role of Surface Friction on Shallow Nonprecipitating Convection
(American Meteorological Society, 2017)AbstractThe role of surface friction on shallow nonprecipitating convection is investigated using a series of large-eddy simulations with varying surface friction velocity and with a cloud identification algorithm. As ... -
Horizontal and Vertical Scaling of Cloud Geometry Inferred from CloudSat Data
(American Meteorological Society, 2018)AbstractA method is described to characterize the scale dependence of cloud chord length using cloud-type classification reported with the 94-GHz CloudSat radar. The cloud length along the CloudSat track is quantified using ... -
The Emergence of Shallow Easterly Jets within QBO Westerlies
(American Meteorological Society, 2017)AbstractA configuration of an idealized general circulation model has been obtained in which a deep, stratospheric, equatorial, westerly jet is established that is spontaneously and quasi-periodically disrupted by shallow ... -
A New Radiative Transfer Method for Solar Radiation in a Vertically Internally Inhomogeneous Medium
(American Meteorological Society, 2017)AbstractThe problem of solar spectral radiation is considered in a layer-based model, with scattering and absorption parallel to the plane for each medium (cloud, ocean, or aerosol layer) and optical properties assumed to ... -
On the Dynamics of Adjustment in the f-Plane Shallow Water Adjoint System
(American Meteorological Society, 2018)AbstractAnalytic results and numerical experimentation reveal that a ?backward? integration of the adjoint of the shallow water system linearized about a basic state at rest on an f plane is characterized by a radiation ... -
On Boussinesq Dynamics near the Tropopause
(American Meteorological Society, 2017)AbstractThe near-tropopause energy spectrum closely follows a ?5/3 power law at mesoscales. Most theories addressing the mesoscale spectrum assume unbalanced dynamics but ignore the tropopause (near which the bulk of the ... -
Linking Hadley Circulation and Storm Tracks in a Conceptual Model of the Atmospheric Energy Balance
(American Meteorological Society, 2018)AbstractMidlatitude storm tracks shift in response to climate change and natural climate variations such as El Niño, but the dynamical mechanisms controlling these shifts are not well established. This paper develops an ... -
Predictive Skill and Predictability of North Atlantic Tropical Cyclogenesis in Different Synoptic Flow Regimes
(American Meteorological Society, 2017)AbstractPractical predictability of tropical cyclogenesis over the North Atlantic is evaluated in different synoptic flow regimes using the NCEP Global Ensemble Forecast System (GEFS) reforecasts with forecast lead time ... -
Sphere-Filling Asymptotics of the Barotropic Potential Vorticity Staircase
(American Meteorological Society, 2017)AbstractFor barotropic flow in spherical geometry, the ideal potential vorticity staircase with flat steps and vertical risers exhibits a relationship between prograde jet strength and spacing such that, for regular spacing, ... -
Simulation of Mesoscale Cellular Convection in Marine Stratocumulus. Part I: Drizzling Conditions
(American Meteorological Society, 2017)AbstractThis study uses eddy-permitting simulations to investigate the mechanisms that promote mesoscale variability of moisture in drizzling stratocumulus-topped marine boundary layers. Simulations show that precipitation ... -
How Uncertainty in Field Measurements of Ice Nucleating Particles Influences Modeled Cloud Forcing
(American Meteorological Society, 2017)AbstractField and laboratory measurements using continuous flow diffusion chambers (CFDCs) have been used to construct parameterizations of the number of ice nucleating particles (INPs) in mixed-phase and completely glaciated ... -
Weakly or Strongly Nonlinear Mesoscale Dynamics Close to the Tropopause?
(American Meteorological Society, 2018)AbstractRecently, it has been discussed whether the mesoscale energy spectra in the upper troposphere and lower stratosphere are generated by weakly or strongly nonlinear dynamics. A necessary condition for weak nonlinearity ... -
Atmospheric Overturning across Multiple Scales of an MJO Event during the CINDY/DYNAMO Campaign
(American Meteorological Society, 2017)AbstractThis study investigates the atmospheric overturning of the October 2011 MJO event observed during the Cooperative Indian Ocean Experiment on Intraseasonal Variability in the Year 2011 (CINDY)/DYNAMO field experiment ...