Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2181-2200 of 13215
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The Evolution of Hurricane Humberto (2001)
(American Meteorological Society, 2013)n 2001, the National Oceanic and Atmospheric Administration and the National Aeronautical and Space Administration marshaled their resources to sample Hurricane Humberto for 3 successive days during the fourth Convection ... -
Comments on “Preconditioning Deep Convection with Cumulus Congestus”
(American Meteorological Society, 2013)he hypothesis that cumulus congestus clouds in the tropics moisten dry layers above the boundary layer and promote the formation of deep moist convection was tested by Hohenegger and Stevens. This comment asks whether their ... -
The Influence of Environmental Low-Level Shear and Cold Pools on Tornadogenesis: Insights from Idealized Simulations
(American Meteorological Society, 2013)dealized, dry simulations are used to investigate the roles of environmental vertical wind shear and baroclinic vorticity generation in the development of near-surface vortices in supercell-like ?pseudostorms.? A cyclonically ... -
An Investigation of the Aerosol Indirect Effect on Convective Intensity Using Satellite Observations
(American Meteorological Society, 2013)he effect of the environment on individual clouds makes it difficult to isolate the signal of the aerosol indirect effect, particularly at larger spatial and temporal scales. This study uses observations from the Tropical ... -
Gravity Currents in Confined Channels with Environmental Shear
(American Meteorological Society, 2013)his study examines properties of gravity currents in confined channels with sheared environmental flow. Under the assumptions of steady and inviscid flow, two-dimensional analytic solutions are obtained for a wide range ... -
The Dynamics of Ascent-Forced Orographic Convection in the Tropics: Results from Dominica
(American Meteorological Society, 2013)he mountainous Caribbean island of Dominica was chosen as a natural laboratory for studying orographic convection in the tropics. Here, the authors focus on a prototypical case study, taken from the Dominica Experiment ... -
A Formulation of Three-Dimensional Residual Mean Flow and Wave Activity Flux Applicable to Equatorial Waves
(American Meteorological Society, 2014)he large-scale waves that are known to be trapped around the equator are called equatorial waves. The equatorial waves cause mean zonal wind acceleration related to quasi-biennial and semiannual oscillations. The interaction ... -
Representing Equilibrium and Nonequilibrium Convection in Large-Scale Models
(American Meteorological Society, 2013)new diagnostic convective closure, which is dependent on convective available potential energy (CAPE), is derived under the quasi-equilibrium assumption for the free troposphere subject to boundary layer forcing. The closure ... -
Equilibrium Tropical Cyclone Size in an Idealized State of Axisymmetric Radiative–Convective Equilibrium
(American Meteorological Society, 2014)ropical cyclone size remains an unsolved problem in tropical meteorology, yet size plays a significant role in modulating damage. This work employs the Bryan cloud model (CM1) to systematically explore the sensitivity of ... -
The Optimal State for Gravity Currents in Shear
(American Meteorological Society, 2013)his study examines the lifting of sheared environmental air by gravity currents, focusing primarily on the theoretical ?optimal state? in which near-surface flow is turned into a vertically oriented jet. Theoretical models ... -
Midlatitude Tropopause and Low-Level Moisture
(American Meteorological Society, 2013)new relationship between the surface distribution of equivalent potential temperature and the potential temperature at the tropopause is proposed. Using a Gaussian approximation for the distribution of equivalent potential ... -
A Novel Multiscale Intensity Metric for Evaluation of Tropical Cyclone Intensity Forecasts
(American Meteorological Society, 2013)n this study, a new multiscale intensity (MSI) metric for evaluating tropical cyclone (TC) intensity forecasts is presented. The metric consists of the resolvable and observable, low-wavenumber intensity represented by the ... -
Spontaneous Superrotation and the Role of Kelvin Waves in an Idealized Dry GCM
(American Meteorological Society, 2013)he nondimensional parameter space of an idealized dry primitive equation model is explored to find superrotating climate states. The model has no convective parameterization and is forced using a simple thermal relaxation ... -
Surface Energy Balance and Buoyancy Response to Shallow Cumulus Shading
(American Meteorological Society, 2013)he interactions surrounding the coupling between surface energy balance and a boundary layer with shallow cumuli are investigated using the National Center for Atmospheric Research?s large-eddy simulation code coupled to ... -
Entropy Evolution Characteristics Associated with the Development of the South Asian Monsoon
(American Meteorological Society, 2013)he structure and evolution characteristics of atmospheric entropy production associated with the climatologic monsoon onset and evolution were investigated using the National Centers for Environmental Prediction (NCEP) ... -
Cirrus, Transport, and Mixing in the Tropical Upper Troposphere
(American Meteorological Society, 2013)he impact of cloud radiative heating on transport time scales from the tropical upper troposphere to the stratosphere is studied in two-dimensional numerical simulations. Clouds are idealized as sources of radiative heating ... -
The Two-Layer Structure of the Entrainment Zone in the Convective Boundary Layer
(American Meteorological Society, 2014)he entrainment zone (EZ) of a dry, shear-free convective boundary layer growing into a linearly stratified fluid is studied by means of direct numerical simulation. The scale separation between the boundary layer thickness ... -
Impact of Climate Drift on Twenty-First-Century Projection in a Coupled Atmospheric–Ocean General Circulation Model
(American Meteorological Society, 2013)educing climate drift in coupled atmosphere?ocean general circulation models (AOGCMs) usually requires 1000?2000 years of spinup, which has not been practical for every modeling group to do. For the purpose of evaluating ... -
A New Method to Retrieve Thin Cloud Optical Thickness from a Ratio of Scattering to Global Solar Irradiance
(American Meteorological Society, 2014)hree kinds of ?visible? cloud optical thickness τ?matching shortwave direct, global, and scattering solar irradiances (Ids, Igs and Iss)?are defined, which are marked as τd, τg, and τs, respectively. It is found from ... -
Latent Heating and Mixing due to Entrainment in Tropical Deep Convection
(American Meteorological Society, 2013)ecent studies have noted the role of latent heating above the freezing level in reconciling Riehl and Malkus' hot tower hypothesis (HTH) with evidence of diluted tropical deep convective cores. This study evaluates recent ...