Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3921-3940 of 13215
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Bi-modal Structure and Variability of Large-Scale Diabatic Heating in the Tropics
(American Meteorological Society, 2009)Tropical diabatic heating profiles estimated using sounding data from eight field campaigns were diagnosed to document their common and prevailing structure and variability that are relevant to the large-scale circulation. ... -
Do Gravity Waves Transport Angular Momentum away from Tropical Cyclones?
(American Meteorological Society, 2010)Previous studies have suggested that gravity waves can transport a significantly large amount of angular momentum away from tropical cyclones, as much as 10% of the core angular momentum per hour. These previous studies ... -
Numerical Simulation of Hurricane Bonnie (1998). Part III: Energetics
(American Meteorological Society, 2009)Despite considerable research on tropical cyclones (TCs), few studies have been performed to examine inner-core energy conversions because of the lack of high-resolution data. In this study, the TC energetic characteristics ... -
Understanding the Importance of Microphysics and Macrophysics for Warm Rain in Marine Low Clouds. Part I: Satellite Observations
(American Meteorological Society, 2009)The importance of macrophysical variables [cloud thickness, liquid water path (LWP)] and microphysical variables (effective radius re, effective droplet concentration Neff) on warm drizzle intensity and frequency across ... -
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(American Meteorological Society, 2009) -
Wave Forcing of the Tropical Upwelling in the Lower Stratosphere under Increasing Concentrations of Greenhouse Gases
(American Meteorological Society, 2009)Two simulations from the Whole Atmosphere Community Climate Model, covering the periods 1950?2003 and 1980?2050, are used to investigate the nature of the waves that force the increase of the tropical upwelling in the lower ... -
Piecewise Potential Vorticity Inversion and Vortex Interaction
(American Meteorological Society, 2009)Piecewise potential vorticity inversion (PPVI) aims at an interpretation of the interaction of potential vorticity (PV) anomalies q. The total flow domain D is divided into subdomains D1 and D2 with q1 and q2 as PV anomalies. ... -
The Basic Ingredients of the North Atlantic Storm Track. Part I: Land–Sea Contrast and Orography
(American Meteorological Society, 2009)Understanding and predicting changes in storm tracks over longer time scales is a challenging problem, particularly in the North Atlantic. This is due in part to the complex range of forcings (land?sea contrast, orography, ... -
Nonlinear Baroclinic Dynamics of Surface Cyclones Crossing a Zonal Jet
(American Meteorological Society, 2009)Mechanisms leading a synoptic surface cyclone to cross an upper-level zonal jet and its subsequent deepening are investigated using a two-layer model on a ? plane. The baroclinic interaction of a low-level circular cyclonic ... -
The Role of Convective Moistening in the Madden–Julian Oscillation
(American Meteorological Society, 2009)This study compares two models that differ primarily in their cloud parameterizations and produce extremely different simulations of the Madden?Julian oscillation (MJO). The Community Atmosphere Model (CAM) version 3.0 ... -
Understanding the Importance of Microphysics and Macrophysics for Warm Rain in Marine Low Clouds. Part II: Heuristic Models of Rain Formation
(American Meteorological Society, 2009)Two simple heuristic model formulations for warm rain formation are introduced and their behavior explored. The first, which is primarily aimed at representing warm rain formation in shallow convective clouds, is a continuous ... -
Interpretation of Tropical Cyclone Forecast Sensitivity from the Singular Vector Perspective
(American Meteorological Society, 2009)In this study, the leading singular vectors (SVs), which are the fastest-growing perturbations (in a linear sense) to a given forecast, are used to examine and classify the dynamic relationship between tropical cyclones ... -
A Theory for Mixed Vortex Rossby–Gravity Waves in Tropical Cyclones
(American Meteorological Society, 2009)Vortex?Rossby waves (VRWs) and inertial gravity waves (IGWs) have been proposed to explain the propagation of spiral rainbands and the development of dynamical instability in tropical cyclones (TCs). In this study, a theory ... -
Tropical Storm Development from African Easterly Waves in the Eastern Atlantic: A Comparison of Two Successive Waves Using a Regional Model as Part of NASA AMMA 2006
(American Meteorological Society, 2009)Two successive African easterly waves (AEWs) from August 2006 are analyzed utilizing observational data, the European Centre for Medium-Range Weather Forecasts reanalysis, and output from the National Center for Atmospheric ... -
On the Momentum Fluxes Associated with Mountain Waves in Directionally Sheared Flows
(American Meteorological Society, 2009)The direct impact of mountain waves on the atmospheric circulation is due to the deposition of wave momentum at critical levels, or levels where the waves break. The first process is treated analytically in this study ... -
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Bulk Formulation of the Heat and Water Vapor Fluxes at the Air–Sea Interface, Including Nonmolecular Contributions
(American Meteorological Society, 2010)Accurate prediction of the air?sea sensible and latent heat fluxes is vital for nearly all applications of atmosphere and ocean models. Existing theories of heat transfer over rough surfaces provide a starting point, but ... -
A Case Study of the Mechanics of Extratropical Influence on the Initiation of the Madden–Julian Oscillation
(American Meteorological Society, 2010)Mechanisms for extratropical influences on the initiation of the Madden?Julian oscillation (MJO) are investigated using numerical simulations and a global reanalysis product. Previous simulations by a tropical channel model ... -
Relative Roles of Land–Sea Distribution and Orography in Asian Monsoon Intensity
(American Meteorological Society, 2009)The relative impacts of various land?sea distributions (LSDs) and mountains on Asian monsoon extent and intensity are assessed using a series of AGCM simulations. The air?sea coupling effects are not considered in this ... -
Spectra, Spatial Scales, and Predictability in a Quasigeostrophic Model
(American Meteorological Society, 2009)Results from homogeneous, isotropic turbulence suggest that predictability behavior is linked to the slope of a flow?s kinetic energy spectrum. Such a link has potential implications for the predictability behavior of ...