Journal of the Atmospheric Sciences: Recent submissions
Now showing items 741-760 of 13215
-
A k–ε Turbulence Model for the Convective Atmosphere
(American Meteorological Society, 2020)A k–ε turbulence model for the stable atmosphere is extended for the convective atmosphere. The new model represents the buoyancy-induced increase in the kinetic energy and scale of eddies, and is consistent with the ... -
Stochastic Variability of Tropical Cyclone Intensity at the Maximum Potential Intensity Equilibrium
(American Meteorological Society, 2020)This study examines the variability of tropical cyclone (TC) intensity associated with stochastic forcings at the maximum potential intensity (PI) equilibrium. By representing TC intensity as an Itô diffusion process in ... -
Towards transient subgrid-scale gravity wave representation in atmospheric models. Part II: Wave intermittency simulated with convective sources
(American Meteorological Society, 2020)In a companion paper, the Multi-Scale Gravity-Wave Model (MS-GWaM) has been introduced and its application to a global model as a transient subgrid-scale parameterization has been described. This paper focuses on the ... -
Effects of Vegetation and Topography on the Boundary Layer Structure above the Amazon Forest
(American Meteorological Society, 2020)Observational data from two field campaigns in the Amazon forest were used to study the vertical structure of turbulence above the forest. The analysis was performed using the reduced turbulent kinetic energy (TKE) budget ... -
Marine boundary layers above heterogeneous SST: Across-front winds
(American Meteorological Society, 2020)Turbulent flow in a weakly convective marine atmospheric boundary layer (MABL) driven by geostrophic winds Ug = 10ms−1 and heterogeneous sea surface temperature (SST) is examined using fine mesh large eddy simulation (LES). ... -
Asymmetric rainband processes leading to secondary eyewall formation in a model simulation of Hurricane Matthew (2016)
(American Meteorological Society, 2020)The dynamics of an asymmetric rainband complex leading into secondary eyewall formation (SEF) are examined in a simulation of Hurricane Matthew (2016), with particular focus on the tangential wind field evolution. Prior ... -
The role of upper-level coupling on Great Plains low-level jet structure and variability
(American Meteorological Society, 2020)The Great Plains (GP) southerly nocturnal low-level jet (GPLLJ) is a dominant contributor to the region’s warm season (May–September) mean and extreme precipitation, wind energy generation and severe weather outbreaks—including ... -
Lilly’s Model for Steady-State Tropical Cyclone Intensity and Structure
(American Meteorological Society, 2020)This study revisits the axisymmetric tropical cyclone (TC) theory from D. K. Lilly’s unpublished manuscript (Lilly model) and compares it to axisymmetric TC simulations from a nonhydrostatic cloud model. Analytic solutions ... -
An Array of Ringing Global Free Modes Discovered in Tropical Surface Pressure Data
(American Meteorological Society, 2020)We used newly available ERA5 hourly global data to examine the variations of atmospheric circulation on global scales and high frequencies. The space–time spectrum of surface pressure displays a typical red background ... -
Dynamical Roles of Mixed Rossby–Gravity Waves in Driving Convective Initiation and Propagation of the Madden–Julian Oscillation: General Views
(American Meteorological Society, 2020)Motivated by the previous case study, this work shows that dynamical variations of mixed Rossby–gravity waves with tropical depression-type circulations (MRGTDs) are one possible drivers of convective initiation and ... -
Spatially variable advection correction of Doppler radial velocity data
(American Meteorological Society, 2020)Techniques to mitigate analysis errors arising from the non-simultaneity of data collections typically use advection-correction procedures based on the hypothesis (frozen turbulence) that the analyzed field can be represented ... -
Squall Line Response to Coastal Mid-Atlantic Thermodynamic Heterogeneities
(American Meteorological Society, 2020)Idealized 3D numerical simulations are used to quantify the impact of moving marine atmospheric boundary layers (MABLs) on squall lines in an environment representative of the U.S. mid-Atlantic coastal plain. Characteristics ... -
Vertical Variability of the Raindrop Size Distribution in Typhoons Observed at the Shenzhen 356-m Meteorological Tower
(American Meteorological Society, 2020)Raindrop size distribution (DSD) characteristics at various altitudes in two landfalling typhoons in 2017 (Hato and Pakhar) were investigated by using laser optical disdrometers mounted at four altitudes (10 m, 40 m, 160 ... -
Observations of Upper-Tropospheric Temperature Inversions in the Indian Monsoon and Their Links to Convectively Forced Quasi-Stationary Kelvin Waves
(American Meteorological Society, 2020)High-vertical-resolution temperature measurements from GPS radio occultation data show frequent upper-tropospheric inversions over the equatorial Indian Ocean during the summer monsoon season. Each year, around 30% of ... -
Rapid droplet coalescence produced by thunder
(American Meteorological Society, 2020)This article considers a simple model to numerically study whether thunderclaps can produce droplet coalescence in natural clouds due to the relative velocities they induce between different-sized droplets. This mechanism ... -
Role of Gravity Waves in a Vortex-Split Sudden Stratospheric Warming in January 2009
(American Meteorological Society, 2020)The role of gravity waves (GWs) in a sudden stratospheric warming (SSW) event that occurred in January 2009 (SSW09) is investigated using the MERRA-2 dataset. Nearly 2 weeks prior to the central date (lag = 0), at which ... -
Structure Functions and Structure Parameters of Velocity Fluctuations in Numerically Simulated Atmospheric Convective Boundary Layer Flows
(American Meteorological Society, 2020)We extend our previous study, which dealt with structure functions of potential temperature fluctuations, and focus on the characteristics of second-order velocity structure functions and corresponding structure parameters ... -
Numerical Simulations of Orographic Convection across Multiple Gray Zones
(American Meteorological Society, 2020)Idealized simulations are used to determine the sensitivity of moist orographic convection to horizontal grid spacing Δh. In simulated mechanically (MECH) and thermally (THERM) forced convection over an isolated ridge, Δh ... -
Transition from Geostrophic Flows to Inertia–Gravity Waves in the Spectrum of a Differentially Heated Rotating Annulus Experiment
(American Meteorological Society, 2020)Inertia–gravity waves (IGWs) play an essential role in the terrestrial atmospheric dynamics as they can lead to energy and momentum flux when propagating upward. An open question is to what extent IGWs contribute to the ... -
Genesis of an East Pacific Easterly Wave from a Panama Bight MCS: A Case Study Analysis from June 2012
(American Meteorological Society, 2020)This study investigates the transition of a Panama Bight mesoscale convective system (MCS) into the easterly wave (EW) that became Hurricane Carlotta (2012). Reanalysis, observations, and a convective-permitting Weather ...