Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1341-1360 of 13215
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An Analytic Description of the Structure and Evolution of Growing Deep Cumulus Updrafts
(American Meteorological Society, 2016)ew theoretical analytic expressions are derived for the evolution of a passive scalar, buoyancy, and vertical velocity in growing, entraining moist deep convective updrafts. These expressions are a function of updraft ... -
The Influences of Boundary Layer Mixing and Cloud-Radiative Forcing on Tropical Cyclone Size
(American Meteorological Society, 2017)ropical cyclone (TC) size is an important factor directly and indirectly influencing track, intensity, and related hazards, such as storm surge. Using a semi-idealized version of the operational Hurricane Weather Research ... -
On the Dynamical Control of the Mesosphere–Lower Thermosphere by the Lower and Middle Atmosphere
(American Meteorological Society, 2017)he NCAR Whole Atmosphere Community Climate Model (WACCM) is used to investigate the dynamical influence of the lower and middle atmosphere on the upper mesosphere and lower thermosphere. In simulations using a methodology ... -
Ice Multiplication by Breakup in Ice–Ice Collisions. Part I: Theoretical Formulation
(American Meteorological Society, 2017)or decades, enhancement of ice concentrations above those of active ice nucleus aerosols was observed in deep clouds with tops too warm for homogeneous freezing, indicating fragmentation of ice (multiplication). Several ... -
Local energetic constraints on Walker circulation strength
(American Meteorological Society, 2017)he weakening of tropical overturning circulations is a robust response to global warming in climate models and observations. However, there remain open questions on the causes of this change and the extent to which this ... -
Effects of Vertical Eddy Diffusivity Parameterization on the Evolution of Landfalling Hurricanes
(American Meteorological Society, 2017)ue to rapid changes in surface conditions when a landfalling hurricane moves from ocean to land, interactions between the hurricane and surface heat and moisture fluxes become essential components of its evolution and ... -
The Gulf Stream Convergence Zone in the time-mean winds
(American Meteorological Society, 2017)he distribution of surface divergence in the Northwest Atlantic is investigated using 10 years of satellite wind observations from the QuikSCAT scatterometer and a 1-yr simulation from the COAMPS atmospheric model. A band ... -
The Route to Raindrop Formation in a Shallow Cumulus Cloud Simulated by a Lagrangian Cloud Model
(American Meteorological Society, 2017)he mechanism of raindrop formation in a shallow cumulus cloud is investigated using a Lagrangian cloud model (LCM). The analysis is focused on how and under which conditions a cloud droplet grows to a raindrop by tracking ... -
Initiation of Deep Convection over an Idealized Mesoscale Convergence Line
(American Meteorological Society, 2016)his study performs cloud-resolving simulations of cumulus convection over an idealized surface-based convergence zone to investigate the mechanisms and sensitivities of deep convection initiation forced by mesoscale ascent. ... -
Corrigendum
(American Meteorological Society, 2017) -
Textured Dust Storm Activity in Northeast Amazonis–Southwest Arcadia, Mars: Phenomenology and Dynamical Interpretation
(American Meteorological Society, 2017)ust storms are Mars?s most notable meteorological phenomenon, but many aspects of their structure and dynamics remain mysterious. The cloud-top appearance of dust storms in visible imagery varies on a continuum between ... -
The role of ice-microphysics parametrizations in determining the prevalence of supercooled liquid water in high-resolution simulations of a Southern Ocean midlatitude cyclone
(American Meteorological Society, 2017)igh-resolution simulations of a Southern Ocean cyclone are compared to satellite-derived observations of liquid water path, cloud-top properties and top-of-atmosphere radiative fluxes. We focus on the cold-air outflow ... -
Mean-flow effects of thermal tides in the mesosphere and lower thermosphere
(American Meteorological Society, 2017)his study addresses the heat budget of the mesosphere and lower thermosphere with regard to the energy deposition of upward propagating waves. To this end we recapitulate the ener-getics of gravity waves, using an anelastic ... -
Tropical Cyclone Outflow-Layer Structure and Balanced Response to Eddy Forcings
(American Meteorological Society, 2016)he ERA-Interim is used to generate azimuthally averaged composites of Atlantic basin tropical cyclones from 1979 to 2014. Both the mean state and the eddy forcing terms exhibited similar radial?vertical structure for all ... -
Deep Convection and Column Water Vapor over Tropical Land versus Tropical Ocean: A Comparison between the Amazon and the Tropical Western Pacific
(American Meteorological Society, 2016)he relationships between the onset of tropical deep convection, column water vapor (CWV), and other measures of conditional instability are analyzed with 2 yr of data from the DOE Atmospheric Radiation Measurement (ARM) ... -
Large-Eddy Simulation of a katabatic jet along a convexly curved slope. Part 1: statistical results.
(American Meteorological Society, 2017)arge Eddy Simulation is performed to study a katabatic jet along a convexly curved slope with a maximum angle of about 35.5°. The design of this numerical simulation of turbulent shear flow is discussed and a qualitative ... -
Saharan Dust and the Nonlinear Evolution of the African Easterly Jet–African Easterly Wave System
(American Meteorological Society, 2016)he direct radiative effects of Saharan mineral dust (SMD) aerosols on the nonlinear evolution of the African easterly jet?African easterly wave (AEJ?AEW) system is examined using the Weather Research and Forecasting Model ... -
Supersaturation Fluctuations during the Early Stage of Cumulus Formation
(American Meteorological Society, 2016)n time scales that are long compared to the phase relaxation time, a quasi-steady supersaturation sqs is expected to exist in clouds. On shorter time scales, however, turbulent fluctuations of temperature and water vapor ... -
Flow Regimes over a Basin Induced by Upstream Katabatic Flows—An Idealized Modeling Study
(American Meteorological Society, 2016)dealized two-dimensional model simulations are performed to study the frequent nocturnal occurrence of downslope-windstorm-type flows in Arizona?s Meteor Crater. The model topography is a simplified representation of the ... -
Modification of the Gravity Wave Parameterization in the Whole Atmosphere Community Climate Model: Motivation and Results
(American Meteorological Society, 2016)he current standard version of the Whole Atmosphere Community Climate Model (WACCM) simulates Southern Hemisphere winter and spring temperatures that are too cold compared with observations. This ?cold-pole bias? leads to ...