Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1621-1640 of 13215
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On the Equilibrium-State Roll Vortices and Their Effects in the Hurricane Boundary Layer
(American Meteorological Society, 2015)n this study, the authors numerically simulate roll vortices (rolls) generated by the inflection-point instability in the hurricane boundary layer (HBL). The approach is based on embedding a two-dimensional high-resolution ... -
Modeling Condensation in Shallow Nonprecipitating Convection
(American Meteorological Society, 2015)wo schemes for modeling condensation in warm nonprecipitating clouds are compared. The first one is the efficient bulk condensation scheme where cloudy volumes are always at saturation and cloud water evaporates instantaneously ... -
Delineating the Barotropic and Baroclinic Mechanisms in the Midlatitude Eddy-Driven Jet Response to Lower-Tropospheric Thermal Forcing
(American Meteorological Society, 2015)bservations and climate models have shown that the midlatitude eddy-driven jet can exhibit an evident latitudinal shift in response to lower-tropospheric thermal forcing (e.g., the tropical SST warming during El Niño or ... -
On the Prospects for Observing Spray-Mediated Air–Sea Transfer in Wind–Water Tunnels
(American Meteorological Society, 2015)ature is wild, unconstrained, and often dangerous. In particular, studying air?sea interaction in winds typical of tropical cyclones can place researchers, their instruments, and even their research platforms in jeopardy. ... -
Mixing Driven by Radiative and Evaporative Cooling at the Stratocumulus Top
(American Meteorological Society, 2015)he stratocumulus-top mixing process is investigated using direct numerical simulations of a shear-free cloud-top mixing layer driven by evaporative and radiative cooling. An extension of previous linear formulations allows ... -
Systematic Changes in Cloud Radiative Forcing with Aerosol Loading for Deep Clouds in the Tropics
(American Meteorological Society, 2015)t has been widely recognized that aerosols can modify cloud properties, but it remains uncertain how much the changes and associated variations in cloud radiative forcing are related to aerosol loading. Using 4 yr of A-Train ... -
The Role of Convective Heating in Tropical Cyclone Eyewall Ring Evolution
(American Meteorological Society, 2015)he purpose of this study is to analyze the role of diabatic heating in tropical cyclone ring structure evolution. A full-physics three-dimensional modeling framework is used to compare the results with two-dimensional ... -
Gravity Wave Diagnostics and Characteristics in Mesoscale Fields
(American Meteorological Society, 2015)s numerical models of complex atmospheric flows increase their quality and resolution, it becomes valuable to isolate and quantify the embedded resolved gravity waves. The authors propose a spatial filtering method combined ... -
Second-Moment Budgets and Mixing Intensity in the Stably Stratified Atmospheric Boundary Layer over Thermally Heterogeneous Surfaces
(American Meteorological Society, 2015)he effect of horizontal temperature heterogeneity of the underlying surface on the turbulence structure and mixing intensity in the stably stratified boundary layer (SBL) is analyzed using large-eddy simulation (LES). ... -
Long-Lived Mesoscale Systems in a Low–Convective Inhibition Environment. Part I: Upshear Propagation
(American Meteorological Society, 2015)ynamical models of organized mesoscale convective systems have identified the important features that help maintain their overarching structure and longevity. The standard model is the trailing stratiform archetype, featuring ... -
Long-Lived Mesoscale Systems in a Low–Convective Inhibition Environment. Part II: Downshear Propagation
(American Meteorological Society, 2015)art II of this study of long-lived convective systems in a tropical environment focuses on forward-tilted, downshear-propagating systems that emerge spontaneously from idealized numerical simulations. These systems differ ... -
Influence of the Quasi-Biennial Oscillation and Sea Surface Temperature Variability on Downward Wave Coupling in the Northern Hemisphere
(American Meteorological Society, 2016)ownward wave coupling occurs when an upward-propagating planetary wave from the troposphere decelerates the flow in the upper stratosphere and forms a downward reflecting surface that redirects waves back to the troposphere. ... -
Multiscale Interactions in an Idealized Walker Cell: Analysis with Isentropic Streamfunctions
(American Meteorological Society, 2015)new approach for analyzing multiscale properties of the atmospheric flow is proposed in this study. For that, the recently introduced isentropic streamfunctions are employed here for scale decomposition with Haar wavelets. ... -
The Dynamics of Australian Monsoon Bursts
(American Meteorological Society, 2015)he wet season of the Australian monsoon is characterized by subseasonal periods of excessively wet or dry conditions, commonly known as monsoon bursts and breaks. This study is concerned with the synoptic evolution prior ... -
Atmospheric Stability Influences on Coupled Boundary Layer and Canopy Turbulence
(American Meteorological Society, 2015)arge-eddy simulation of atmospheric boundary layers interacting with a coupled and resolved plant canopy reveals the influence of atmospheric stability variations from neutral to free convection on canopy turbulence. The ... -
Dynamics of the Northern Annular Mode at Weekly Time Scales
(American Meteorological Society, 2015)apid onsets of positive and negative tropospheric northern annular mode (NAM) events during boreal winters are studied using ERA-Interim datasets. The NAM anomalies first appear in the North Pacific from low-frequency ... -
Assessing the Equatorial Long-Wave Approximation: Asymptotics and Observational Data Analysis
(American Meteorological Society, 2015)quatorial long-wave theory applies where a small horizontal aspect ratio between meridional and zonal length scales is assumed. In an idealized setting, the theory suggests that (i) meridional wind is small, (ii) geostrophic ... -
The Role of Moisture in Summertime Low-Level Jet Formation and Associated Rainfall over the East Asian Monsoon Region
(American Meteorological Society, 2015)he southwesterly low-level jet (LLJ) located to the east of the Tibetan Plateau in southern China plays an important role in summertime convective initiation over north China. This study adopts a novel perspective and uses ... -
A Spectral Budget Model for the Longitudinal Turbulent Velocity in the Stable Atmospheric Surface Layer
(American Meteorological Society, 2015)spectral budget model is developed to describe the scaling behavior of the longitudinal turbulent velocity variance with the stability parameter and the normalized height in an idealized stably stratified atmospheric surface ... -
A Three-Dimensional Multivariate Modal Analysis of Atmospheric Predictability with Application to the ECMWF Ensemble
(American Meteorological Society, 2015)new methodology for the analysis of ensemble prediction systems (ENSs) is presented and applied to 1 month (December 2014) of ECMWF operational ensemble forecasts. The method relies on the decomposition of the global ...