Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2221-2240 of 13215
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The Mystery of Ice Crystal Multiplication in a Laboratory Experiment
(American Meteorological Society, 2013)his paper addresses the problem of the large discrepancies between ice crystal concentrations in clouds and the number of ice nuclei in nearby clear air reported in published papers. Such discrepancies cannot always be ... -
Wave Forcing of Zonal Mean Angular Momentum in Various Coordinate Systems
(American Meteorological Society, 2014)he wave forcing of the atmospheric mean flow in isentropic coordinates has been investigated intensively in the past with the divergence of the Eliassen?Palm flux playing a dominating role. These concepts are reviewed ... -
Poleward Shift and Change of Frontal Activity in the Southern Hemisphere over the Last 40 Years
(American Meteorological Society, 2013)everal studies have documented the poleward shift of the midlatitude westerly jet of the Southern Hemisphere during the last decades of the twentieth century, mainly during the warm season. In this work the consistency ... -
Including Surface Kinetic Effects in Simple Models of Ice Vapor Diffusion
(American Meteorological Society, 2013)model for kinetically limited vapor growth and aspect ratio evolution of atmospheric single ice crystals is presented. The method is based on the adaptive habit model of J. Chen and D. Lamb but is modified to include the ... -
The Impact of Baroclinic Eddy Feedback on the Persistence of Jet Variability in the Two-Layer Model
(American Meteorological Society, 2013)lthough it is well known that the persistence of extratropical jet shifts is enhanced by a positive eddy feedback, the dynamics of this feedback is still debated. Two types of mechanisms have been proposed: barotropic ... -
Investigating Hector Convective Development and Microphysical Structure Using High-Resolution Model Simulations, Ground-Based Radar Data, and TRMM Satellite Data
(American Meteorological Society, 2013)ne event of a tropical thunderstorm typically observed in northern Australia, known as Hector, is investigated using high-resolution model output from the fifth-generation Pennsylvania State University?National Center for ... -
Effect of the Kinematic Lower Boundary Condition on the Spectral and Autocorrelation Structure of Annular Variability in the Troposphere
(American Meteorological Society, 2014)he dynamical origin of the spectral and autocorrelation structure of annular variability in the troposphere is investigated by a deductive approach. Specifically, the structure of the power spectrum and autocorrelation ... -
Prognostic Equation for Radar Radial Velocity Derived by Considering Atmospheric Refraction and Earth Curvature
(American Meteorological Society, 2013)he prognostic equation for the radial velocity field observed with a Doppler radar is derived to include the effects of atmospheric refraction and earth curvature on radar-beam height and slope angle. The derived equation, ... -
Ship-Based Observations of the Diurnal Cycle of Southeast Pacific Marine Stratocumulus Clouds and Precipitation
(American Meteorological Society, 2013)he diurnal cycle of marine stratocumulus in cloud-topped boundary layers is examined using ship-based meteorological data obtained during the 2008 Variability of American Monsoon Systems (VAMOS) Ocean?Cloud?Atmosphere?Land ... -
The Residual-Mean Circulation in the Tropical Tropopause Layer Driven by Tropical Waves
(American Meteorological Society, 2013)atent heating estimates derived from rainfall observations are used to construct model experiments that isolate equatorial waves forced by tropical convection from midlatitude synoptic-scale waves. These experiments are ... -
Applicability of Reduced-Gravity Shallow-Water Theory to Atmospheric Flow over Topography
(American Meteorological Society, 2013)pplicability of the reduced-gravity shallow-water (RGSW) theory to a shallow atmospheric layer capped by an inversion underneath a deep stratified atmosphere over a two-dimensional ridge has been investigated using linear ... -
Random Errors in Turbulence Measurements in the Atmospheric Surface Layer: Implications for Monin–Obukhov Similarity Theory
(American Meteorological Society, 2012)n error propagation analysis is conducted to estimate random errors in the friction velocity u* and the Monin?Obukhov similarity theory (MOST) stability variable z/L from estimated random errors in the turbulent fluxes. ... -
The North Atlantic Oscillation and the North Atlantic Jet Variability: Precursors to NAO Regimes and Transitions
(American Meteorological Society, 2012)n this paper, precursors to the North Atlantic Oscillation (NAO) and its transitions are investigated to understand the dynamical cause of the interdecadal NAO variability from dominant negative (NAO?) events during 1950?77 ... -
Preconditioning Deep Convection with Cumulus Congestus
(American Meteorological Society, 2012)ecent studies have pushed forward the idea that congestus clouds, through their moistening of the atmosphere, could promote deep convection. On the other hand, older studies have tended to relate convective initiation to ... -
A New Look at the Physics of Rossby Waves: A Mechanical–Coriolis Oscillation
(American Meteorological Society, 2012)he presence of the latitudinal variation of the Coriolis parameter serves as a mechanical barrier that causes a mass convergence for the poleward geostrophic flow and divergence for the equatorward flow, just as a sloped ... -
Hypercooling in the Atmospheric Boundary Layer: Beyond Broadband Emissivity Schemes
(American Meteorological Society, 2012)n an accompanying paper by Ponnulakshmi et al., the prevailing flux emissivity scheme for nonblack surfaces was shown to include an erroneous reflected flux term. The error leads to a spurious cooling within the opaque ... -
Structural and Surface Features of Arc-Shaped Radar Echoes along an Outer Tropical Cyclone Rainband
(American Meteorological Society, 2012)his study uses ground-based dual-Doppler radar and surface observations to document the structural and surface features of the arc-shaped radar echoes (ASREs) evident along an outer rainband of Typhoon Longwang as it ... -
On the Intermittency of Gravity Wave Momentum Flux in the Stratosphere
(American Meteorological Society, 2012)n this article, long-duration balloon and spaceborne observations, and mesoscale numerical simulations are used to study the intermittency of gravity waves in the lower stratosphere above Antarctica and the Southern Ocean; ... -
Surface Pressure Fluctuations Produced by the Total Solar Eclipse of 1 August 2008
(American Meteorological Society, 2012)uring a solar eclipse, the moon?s shadow progressively occults a part of Earth from the solar flux. This induces a cooling in the atmospheric layers that usually absorb the solar radiation. Since the eclipse shadow travels ... -
West African Monsoon Intraseasonal Variability: A Precipitable Water Perspective
(American Meteorological Society, 2012)est African monsoon intraseasonal variability has important implications for food security and drought early warnings. In the present study, intraseasonal variability over the Sahel is assessed from the perspective of ...