Journal of the Atmospheric Sciences: Recent submissions
Now showing items 901-920 of 13215
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On the Relative Sensitivity of a Tropical Deep Convective Storm to Changes in Environment and Cloud Microphysical Parameters
(American Meteorological Society, 2019)AbstractMonte Carlo and Morris screening techniques are used to examine the relative sensitivity of deep convective simulations to changes in initial conditions (IC) versus changes to microphysical parameters (MP). IC are ... -
Zonal-Mean Atmospheric Dynamics of Slowly Rotating Terrestrial Planets
(American Meteorological Society, 2019)AbstractThe zonal-mean atmospheric flow of an idealized terrestrial planet is investigated using both numerical simulations and zonally symmetric theories, focusing largely on the limit of low planetary rotation rate. Two ... -
Madden–Julian Oscillations Seen in the Upper-Troposphere Vorticity Field: Interactions with Rossby Wave Trains
(American Meteorological Society, 2019)AbstractThe vorticity variability associated with the Madden?Julian oscillation (MJO) is examined. The analysis is focused on the 150-hPa pressure level, because a clear dipolar-vortex signal, reminiscent of the theoretically ... -
The Importance of the Ice-Phase Microphysics Parameterization for Simulating the Effects of Changes to CCN Concentrations in Deep Convection
(American Meteorological Society, 2019)AbstractSimulations of a well-observed squall line that occurred during the Midlatitude Continental Convective Clouds Experiment (MC3E) were conducted using a mesoscale model with a horizontal grid spacing of 1 km to examine ... -
Mesoscale Processes during the Genesis of Hurricane Karl (2010)
(American Meteorological Society, 2019)AbstractObservations from the Pre-Depression Investigation of Cloud Systems in the Tropics (PREDICT), Genesis and Rapid Intensification Processes (GRIP), and Intensity Forecast Experiment (IFEX) field campaigns are analyzed ... -
Sensible Heat Fluxes in the Nearly Neutral Boundary Layer: The Impact of Frictional Heating within the Surface Layer
(American Meteorological Society, 2019)AbstractThe effect of frictional dissipative heating on the calculation of surface fluxes in the atmospheric boundary layer using bulk flux formulas is considered. Although the importance of frictional dissipation in intense ... -
Statistical State Dynamics of Weak Jets in Barotropic Beta-Plane Turbulence
(American Meteorological Society, 2018)AbstractZonal jets in a barotropic setup emerge out of homogeneous turbulence through a flow-forming instability of the homogeneous turbulent state (zonostrophic instability), which occurs as the turbulence intensity ... -
Estimating Turbulence Kinetic Energy Dissipation Rates in the Numerically Simulated Stratocumulus Cloud-Top Mixing Layer: Evaluation of Different Methods
(American Meteorological Society, 2019)AbstractIn this work, direct numerical simulation (DNS) of the stratocumulus cloud-top mixing layer is used to test various approaches to estimate the turbulence kinetic energy (TKE) dissipation rate ε from one-dimensional ... -
Stratified Flows over and around Long Dynamically Tall Mountain Ridges
(American Meteorological Society, 2019)AbstractUniformly stratified flows approaching long and dynamically tall ridges develop two distinct flow components over disparate time scales. The fluid upstream and below a ?blocking level? is stagnant in the limit of ... -
Measuring Area-Averaged Vertical Motions with Dropsondes
(American Meteorological Society, 2018)AbstractMeasurements of vertical profiles of areal-mean mass divergence, vorticity, and vertical velocity, based on dropsondes distributed over an area of 25 000 km2, are presented. The dropsondes were released with high ... -
Remote Sensing of Sea Salt Aerosol below Trade Wind Clouds
(American Meteorological Society, 2019)AbstractSea salt aerosol in the boundary layer below shallow cumulus clouds is remotely observed with a Ka-band cloud radar at the Barbados Cloud Observatory and is detected in 76% of the measurements over 1 year. Carried ... -
Universality in the Spatial Evolution of Self-Aggregation of Tropical Convection
(American Meteorological Society, 2019)AbstractSelf-aggregation in numerical simulations of tropical convection is described by an upscale growth and intensification of dry and moist regions. Previous work has focused on determining the relevant mechanism that ... -
Estimating Convection’s Moisture Sensitivity: An Observation–Model Synthesis Using AMIE-DYNAMO Field Data
(American Meteorological Society, 2019)AbstractWe seek to use ARM MJO Investigation Experiment (AMIE)-DYNAMO field campaign observations to significantly constrain height-resolved estimates of the parameterization-relevant, causal sensitivity of convective ... -
Deep Convective Organization, Moisture Vertical Structure, and Convective Transition Using Deep-Inflow Mixing
(American Meteorological Society, 2019)AbstractIt is an open question whether an integrated measure of buoyancy can yield a strong relation to precipitation across tropical land and ocean, across the seasonal and diurnal cycles, and for varying degrees of ... -
The Predictability of Tropical Pacific Decadal Variability: Insights from Attractor Reconstruction
(American Meteorological Society, 2019)AbstractTropical Pacific decadal variability (TPDV), though not the totality of Pacific decadal variability, has wide-ranging climatic impacts. It is currently unclear whether this phenomenon is predictable. In this study, ... -
Impact of Aerosol Shortwave Radiative Heating on Entrainment in the Atmospheric Convective Boundary Layer: A Large-Eddy Simulation Study
(American Meteorological Society, 2018)AbstractEntrainment is critical to the development of the atmospheric convective boundary layer (CBL), but little is known about how entrainment is impacted by the aerosol radiative effect. An aerosol radiation transfer ... -
On the Creation and Evolution of Small-Scale Low-Level Vorticity Anomalies during Tropical Cyclogenesis
(American Meteorological Society, 2019)AbstractRecent numerical modeling and observational studies indicate the importance of vortical hot towers (VHTs) in the transformation of a tropical disturbance to a tropical depression. It has recently been recognized ... -
The Eddy-Driven Jet and Storm-Track Responses to Boundary Layer Drag: Insights from an Idealized Dry GCM Study
(American Meteorological Society, 2019)AbstractSimulations using a dry, idealized general circulation model (GCM) are conducted to systematically investigate the eddy-driven jet?s sensitivity to the location of boundary layer drag. Perturbations of boundary ... -
Formulation of Three-Dimensional Quasi-Residual Mean Flow Balanced with Diabatic Heating Rate and Potential Vorticity Flux
(American Meteorological Society, 2019)AbstractThree-dimensional (3D) quasi-residual mean flow is derived to diagnose 3D dynamical material transport associated with stationary planetary waves. The 3D quasi-residual mean vertical flow does not include the ... -
Modeling the Transient Response of Tropical Convection to Mesoscale SST Variations
(American Meteorological Society, 2019)AbstractA cloud-resolving model coupled to a mixed layer ocean with an initial 500-km-wide, +3-K sea surface temperature (SST) patch is used to demonstrate the relationship between tropical mesoscale SST gradients and ...