Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2521-2540 of 13215
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Mechanisms of the Tropical Upwelling Branch of the Brewer–Dobson Circulation: The Role of Extratropical Waves
(American Meteorological Society, 2011)he role of extratropical waves in the tropical upwelling branch of the Brewer?Dobson circulation is investigated in an idealized model of the stratosphere and troposphere. To simulate different stratospheric seasonal cycles ... -
Similarities between Optimal Precursors that Trigger the Onset of Blocking Events and Optimally Growing Initial Errors in Onset Prediction
(American Meteorological Society, 2011)triangular T21, three-level, quasigeostrophic global spectral model was used to investigate how precursors relate to the predictability of blocking onset when a conditional nonlinear optimal perturbation approach is used. ... -
Ice Crystal Linear Growth Rates from −20° to −70°C: Confirmation from Wave Cloud Studies
(American Meteorological Society, 2011)s a result of recent comprehensive laboratory and field studies, many details have been clarified concerning atmospheric ice crystal habits below ?20°C as a function of temperature, ice supersaturation, air pressure, and ... -
Mesoscale Energy Spectra of Moist Baroclinic Waves
(American Meteorological Society, 2012)he role of moist processes in the development of the mesoscale kinetic energy spectrum is investigated with numerical simulations of idealized moist baroclinic waves. Dry baroclinic waves yield upper-tropospheric kinetic ... -
An Observational Study of Vertical Eddy Diffusivity in the Hurricane Boundary Layer
(American Meteorological Society, 2012)lthough vertical eddy diffusivity or viscosity has been extensively used in theoretical and numerical models simulating tropical cyclones, little observational study has documented the magnitude of the eddy diffusivity in ... -
Spatial Growth of Perturbations in a Turbulent Baroclinic Jet
(American Meteorological Society, 2011)he spatial spreading of infinitesimal disturbances superposed on a turbulent baroclinic jet is explored. This configuration is representative of analysis errors in an idealized midlatitude storm track and the insight gained ... -
Effects of Asymmetric Latent Heating on Typhoon Movement Crossing Taiwan: The Case of Morakot (2009) with Extreme Rainfall
(American Meteorological Society, 2012)yphoon Morakot struck Taiwan during 6?9 August 2009, and it produced the highest rainfall (approaching 3000 mm) and caused the worst damage in the past 50 yr. Typhoon?monsoon flow interactions with mesoscale convection, ... -
Modeling Study of Ice Formation in Warm-Based Precipitating Shallow Cumulus Clouds
(American Meteorological Society, 2012)bservations of large concentrations of ice particles in the dissipating stage of warm-based precipitating shallow cumulus clouds point to the limitations of scientists? understanding of the physics of such clouds and the ... -
A Parameterization for the Effects of Ozone on the Wave Driving Exerted by Equatorial Waves in the Stratosphere
(American Meteorological Society, 2012)n equatorial ?-plane model of the tropical stratosphere is used to examine the effects of ozone on Kelvin, Rossby?gravity, equatorial Rossby, inertia?gravity, and smaller-scale gravity waves. The model is composed of coupled ... -
A Study of the Impacts of Vertical Diffusion on the Structure and Intensity of the Tropical Cyclones Using the High-Resolution HWRF System
(American Meteorological Society, 2012)he Hurricane Weather Research and Forecasting (HWRF) system was used in an idealized framework to gain a fundamental understanding of the variability in tropical cyclone (TC) structure and intensity prediction that may ... -
The Influence of the QBO on the Propagation of Equatorial Waves into the Stratosphere
(American Meteorological Society, 2012)he variation of stratospheric equatorial wave characteristics with the phase of the quasi-biennial oscillation (QBO) is investigated using ECMWF Re-Analysis and NOAA outgoing longwave radiation (OLR) data. The impact of ... -
Stratospheric versus Tropospheric Control of the Strength and Structure of the Brewer–Dobson Circulation
(American Meteorological Society, 2012)he strength and structure of the Brewer?Dobson circulation (BDC) are explored in an idealized general circulation model. It is shown that diabatic forcing of the stratosphere and planetary wave forcing by the troposphere ... -
Numerical Tests of the Weak Pressure Gradient Approximation
(American Meteorological Society, 2012)loud-resolving simulations of convection over a surface temperature hot spot are used to evaluate the weak pressure gradient (WPG) and weak temperature gradient (WTG) approximations. The premise of the relaxed form of ... -
Differences between More Divergent and More Rotational Types of Convectively Coupled Equatorial Waves. Part II: Composite Analysis based on Space–Time Filtering
(American Meteorological Society, 2011)his paper describes an analysis of multiyear satellite datasets to characterize the modulations of convective versus stratiform rain, rain system size, and column water vapor by convectively coupled equatorial waves. ... -
Vertical Wavenumber Spectra of Gravity Waves in the Martian Atmosphere Obtained from Mars Global Surveyor Radio Occultation Data
(American Meteorological Society, 2012)ertical wavenumber spectra of Martian gravity waves were obtained for the altitude range 3?32 km from temperature profiles acquired by the Mars Global Surveyor (MGS) radio occultation experiments. The spectra, which cover ... -
High-Resolution Modeling of Typhoon Morakot (2009): Vortex Rossby Waves and Their Role in Extreme Precipitation over Taiwan
(American Meteorological Society, 2012)high-resolution nonhydrostatic numerical model, the Advanced Regional Prediction System (ARPS), was used to simulate Typhoon Morakot (2009) as it made landfall over Taiwan, producing record rainfall totals. In particular, ... -
Weak Pressure Gradient Approximation and Its Analytical Solutions
(American Meteorological Society, 2012)weak pressure gradient (WPG) approximation is introduced for parameterizing supradomain-scale (SDS) dynamics, and this method is compared to the relaxed form of the weak temperature gradient (WTG) approximation in the ... -
Nonlinear Effects on Convectively Forced Two-Dimensional Mesoscale Flows
(American Meteorological Society, 2012)ne of the important problems in mesoscale atmospheric dynamics is how the atmosphere responds to convective heating or cooling. Here, the authors examine nonlinear effects on convectively forced mesoscale flows in the ... -
The Importance of the Nontraditional Coriolis Terms in Large-Scale Motions in the Tropics Forced by Prescribed Cumulus Heating
(American Meteorological Society, 2012)n meteorological dynamics, the shallow-atmosphere approximation is generally used in the momentum equation, together with the ?traditional approximation.? In the traditional approximation, two cosine Coriolis terms [hereafter ... -
Linear versus Nonlinear Filtering with Scale-Selective Corrections for Balanced Dynamics in a Simple Atmospheric Model
(American Meteorological Society, 2012)his paper investigates the role of the linear analysis step of the ensemble Kalman filters (EnKF) in disrupting the balanced dynamics in a simple atmospheric model and compares it to a fully nonlinear particle-based filter ...