Journal of the Atmospheric Sciences: Recent submissions
Now showing items 421-440 of 13215
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A Linear Relationship between Vertical Velocity and Condensation Processes in Deep Convection
(2022)Vertical velocities and microphysical processes within deep convection are intricately linked, having wide-ranging impacts on water and mass vertical transport, severe weather, extreme precipitation, and the global ... -
A New Three-Dimensional Residual Flow Theory and Its Application to Brewer–Dobson Circulation in the Middle and Upper Stratosphere
(2022)This study formulates three-dimensional (3D) residual flow, treating both stationary and transient waves. The zonal and meridional momentum equations contain four terms: the geostrophic wind tendency, Coriolis force for ... -
Shallow Cumulus Properties as Captured by Adiabatic Fraction in High-Resolution LES Simulations
(2022)Shallow convective clouds are important players in Earth’s energy budget and hydrological cycle, and are abundant in the tropical and subtropical belts. They greatly contribute to the uncertainty in climate predictions due ... -
Combined Effect of the Wegener–Bergeron–Findeisen Mechanism and Large Eddies on Microphysics of Mixed-Phase Stratiform Clouds
(2022)The process of glaciation in mixed-phase stratiform clouds was investigated by a novel Lagrangian–Eulerian model (LEM) in which thousands of adjoining Lagrangian parcels moved within a turbulent-like velocity field with ... -
Transient Eddy Kinetic Energetics on Mars in Three Reanalysis Datasets
(2022)The ability of Martian reanalysis datasets to represent the growth and decay of short-period (1.5 < P < 8 sol) transient eddies is compared across the Mars Analysis Correction Data Assimilation (MACDA), Open access to Mars ... -
Influences of Environmental Relative Humidity and Horizontal Scale of Subcloud Ascent on Deep Convective Initiation
(2022)This study examines two factors impacting initiation of moist deep convection: free-tropospheric environmental relative humidity (ϕE) and horizontal scale of subcloud ascent (Rsub), the latter exerting a dominant control ... -
Masthead
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Indications of a Decrease in the Depth of Deep Convective Cores with Increasing Aerosol Concentration during the CACTI Campaign
(2022)An aerosol indirect effect on deep convective cores (DCCs), by which increasing aerosol concentration increases cloud-top height via enhanced latent heating and updraft velocity, has been proposed in many studies. However, ... -
QG–DL–Ekman: Dynamics of a Diabatic Layer in the Quasi-Geostrophic Framework
(2022)Quasigeostrophic (QG) theory describes the dynamics of synoptic-scale flows in the troposphere that are balanced with respect to both acoustic and internal gravity waves. Within this framework, effects of (turbulent) ... -
Northern Hemisphere Winter Blocking: Differing Onset Mechanisms across Regions
(2022)Atmospheric blocking is a prolific producer of extreme weather with significant socioeconomic impacts. Different physical mechanisms for blocking onset have been proposed and are generally focused on two sectors: the ... -
An Idealized 1½-Layer Isentropic Model with Convection and Precipitation for Satellite Data Assimilation Research. Part II: Model Derivation
(2022)In this Part II paper we present a fully consistent analytical derivation of the “dry” isentropic 1½-layer shallow-water model described and used in Part I of this study, with no convection and precipitation. The mathematical ... -
An Idealized 1½-Layer Isentropic Model with Convection and Precipitation for Satellite Data Assimilation Research. Part I: Model Dynamics
(2022)An isentropic 1½-layer model based on modified shallow-water equations is presented, including terms mimicking convection and precipitation. This model is an updated version of the isopycnal single-layer modified rotating ... -
On the Effect of Surface Friction and Upward Radiation of Energy on Equatorial Waves
(2022)In theoretical models of tropical dynamics, the effects of both surface friction and upward wave radiation through interaction with the stratosphere are oft-ignored, as they greatly complicate mathematical analysis. In ... -
Generalized Lapse Rate Formulas for Use in Entraining CAPE Calculations
(2022)Common assumptions in temperature lapse rate formulas for lifted air parcels include neglecting mixing, hydrostatic balance, the removal of all condensate once it forms (pseudoadiabatic), and/or the retention of all ... -
Convective and Turbulent Motions in Nonprecipitating Cu. Part II: LES Simulated Cloud Represented by a Starting Plume
(2022)The dynamic structure of a small trade wind cumulus (Cu) is analyzed using a novel approach. Cu developing in a shear-free environment is simulated by 10-m-resolution LES model with spectral bin microphysics. The aim is ... -
Observational Study on Boundary Layer Moist Static Energy Budget over the Tropical Western Pacific and Its Variability Associated with Boreal Summer Intraseasonal Oscillation
(2022)Moist static energy (MSE) in the atmospheric boundary layer (BL) is one of the essential parameters determining convective activity over tropical oceanic areas. It is thus important to quantitatively understand BL MSE ... -
Moist Static Potential Vorticity Budget in Tropical Motion Systems
(2022)Analyses of simple models of moist tropical motion systems reveal that the column-mean moist static potential vorticity (MSPV) can explain their propagation and growth. The MSPV is akin to the equivalent PV except it uses ... -
Does the Rotating Convection Paradigm Describe Secondary Eyewall Formation in Idealized Three-Dimensional Simulations?
(2022)The formation of a plausible secondary eyewall is examined with two principal simulation experiments that differ only in the fixed value of rain fall speed, one with a value of 70 m s−1 (approaching the pseudo-adiabatic ... -
The Influence of Shallow Cloud Populations on Transitions to Deep Convection in the Amazon
(2022)In this study, a pair of convection-permitting (2-km grid spacing), month-long, wet-season Weather Research and Forecasting (WRF) Model simulations with and without the eddy-diffusivity mass-flux (EDMF) scheme are performed ... -
Deep Eye Clouds in Tropical Cyclone Trami (2018) during T-PARCII Dropsonde Observations
(2022)The sporadic formation of short-lived convective clouds in the eye of Tropical Cyclone (TC) Trami (2018) is investigated using dropsonde data and simulation results from a coupled atmosphere–ocean model. According to the ...