Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1941-1960 of 13215
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Reply to “Comments on ‘How Does the Boundary Layer Contribute to Eyewall Replacement Cycles in Axisymmetric Tropical Cyclones?’”
(American Meteorological Society, 2014) -
What Drives the Brewer–Dobson Circulation?
(American Meteorological Society, 2014)ecent studies have revealed strong interactions between resolved Rossby wave and parameterized gravity wave driving in stratosphere-resolving atmospheric models. Perturbations to the parameterized wave driving are often ... -
Departures from Axisymmetric Balance Dynamics during Secondary Eyewall Formation
(American Meteorological Society, 2014)epartures from axisymmetric balance dynamics are quantified during a case of secondary eyewall formation. The case occurred in a three-dimensional mesoscale convection-permitting numerical simulation of a tropical cyclone, ... -
Metastability of Northern Hemisphere Teleconnection Modes
(American Meteorological Society, 2014)his study applies a finite-element, bounded-variation, vector autoregressive method to assess midtropospheric flow regimes characterized by regime switches between metastable states. The flow is assessed in reanalysis data ... -
Laboratory Measurements of Contact Freezing by Dust and Bacteria at Temperatures of Mixed-Phase Clouds
(American Meteorological Society, 2014)aboratory measurements of freezing by aerosol particles in contact mode are presented. The fraction of particles catalyzing freezing is quantified for three mineral dusts and three strains of bacteria. This is the most ... -
A Mechanism of Tropical Convection Inferred from Observed Variability in the Moist Static Energy Budget
(American Meteorological Society, 2014)emporal variability in the moist static energy (MSE) budget is studied with measurements from a combination of different satellites including the Tropical Rainfall Measuring Mission (TRMM) and A-Train platforms. A composite ... -
Anelastic and Compressible Simulation of Moist Deep Convection
(American Meteorological Society, 2014)nelastic and compressible solutions are compared for two moist deep convection benchmarks, a two-dimensional thermal rising in a saturated moist-neutral deep atmosphere, and a three-dimensional supercell formation. In the ... -
The Relationship between Hurricane Potential Intensity and CAPE
(American Meteorological Society, 2014)he theoretical minimum eyewall pressure of tropical cyclones can be computed from convective available potential energy (CAPE) if the buoyancy in the CAPE is allowed to feed back on the surface pressure via hydrostatic ... -
Zonally Symmetric Adjustment in the Presence of Artificial Relaxation
(American Meteorological Society, 2014)umerical experiments, presented in a companion paper, have been performed in which the zonal-mean state of the stratosphere in a comprehensive, stratosphere-resolving, general circulation model is strongly relaxed (or ... -
The Characterization of Ice Hydrometeor Gamma Size Distributions as Volumes in N0–λ–μ Phase Space: Implications for Microphysical Process Modeling
(American Meteorological Society, 2014)amma distributions represent particle size distributions (SDs) in mesoscale and cloud-resolving models that predict one, two, or three moments of hydrometeor species. They are characterized by intercept (N0), slope (?), ... -
The Downward Influence of Stratospheric Sudden Warmings
(American Meteorological Society, 2014)he coupling between the stratosphere and the troposphere following two major stratospheric sudden warmings is studied in the Canadian Middle Atmosphere Model using a nudging technique by which the zonal-mean evolution of ... -
Transient Cold Air Drainage down a Shallow Valley
(American Meteorological Society, 2014)rainage of cold air down a small valley and associated near-surface wind maxima are examined from 20 stations with sonic anemometers at 1 m and from a 20-m tower that includes six sonic anemometers in the lowest 5 m, ... -
A Pathway Connecting the Monsoonal Heating to the Rapid Arctic Ice Melt
(American Meteorological Society, 2014)his study provides a monsoonal link to the rapid Arctic ice melt. Each year the planetary-scale African?Asian monsoonal outflow near the tropopause carries a large anticyclonic gyre that has a longitudinal spread that ... -
Genesis of Hurricane Julia (2010) within an African Easterly Wave: Sensitivity Analyses of WRF-LETKF Ensemble Forecasts
(American Meteorological Society, 2014)n this study, the predictability of tropical cyclogenesis (TCG) is explored by conducting ensemble sensitivity analyses on the TCG of Hurricane Julia (2010). Using empirical orthogonal functions (EOFs), the dominant patterns ... -
Influence of Large-Scale Conductivity Inhomogeneities in the Atmosphere on the Global Electric Circuit
(American Meteorological Society, 2014)heoretical estimation of the influence of large-scale conductivity inhomogeneities on the global electric circuit and, in particular, on the ionospheric potential is considered. A well-posed formulation of this problem is ... -
Low Richardson Number in the Tropical Cyclone Outflow Layer
(American Meteorological Society, 2014)ropsondes from the NOAA G-IV aircraft were used to examine the presence of low bulk Richardson numbers RB in tropical cyclones. At least one 400-m layer above z = 7.5 km exhibited RB < 1 in 96% of the sondes and RB ≤ 0.25 ... -
Atmospheric Predictability: Why Butterflies Are Not of Practical Importance
(American Meteorological Society, 2014)he spectral turbulence model of Lorenz, as modified for surface quasigeostrophic dynamics by Rotunno and Snyder, is further modified to more smoothly approach nonlinear saturation. This model is used to investigate error ... -
How Does the Quasi-Biennial Oscillation Affect the Stratospheric Polar Vortex?
(American Meteorological Society, 2013)he stratospheric polar vortex is weaker in the easterly phase of the quasi-biennial oscillation (QBO-E) than in the westerly phase (QBO-W), but the mechanism behind the QBO's influence is not well understood. The composite ... -
On the Origin and Impact of a Polygonal Eyewall in the Rapid Intensification of Hurricane Wilma (2005)
(American Meteorological Society, 2013)n analysis of a high-resolution dataset from a realistic simulation of Hurricane Wilma (2005) was performed to understand the mechanism for the formation of a prominent polygonal eyewall and mesovortices during the rapid ... -
Scale Dependency of Total Water Variance and Its Implication for Cloud Parameterizations
(American Meteorological Society, 2013)he scale dependency of variance of total water mixing ratio is explored by analyzing data from a general circulation model (GCM), a numerical weather prediction model (NWP), and large-eddy simulations (LESs). For clarification, ...