Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3681-3700 of 13215
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Spatially Variable Advection Correction of Radar Data. Part II: Test Results
(American Meteorological Society, 2010)The spatially variable advection-correction/analysis procedure introduced in Part I is tested using analytical reflectivity blobs embedded in a solid-body vortex, and Terminal Doppler Weather Radar (TDWR) and Weather ... -
Large-Eddy Simulation of Post-Cold-Frontal Continental Stratocumulus
(American Meteorological Society, 2010)Previous large-eddy simulations (LES) of stratocumulus-topped boundary layers have been exclusively set in marine environments. Boundary layer stratocumulus clouds are also prevalent over the continent but have not been ... -
A Higher-Order Ray Approximation Applied to Orographic Gravity Waves: Gaussian Beam Approximation
(American Meteorological Society, 2010)Ray techniques are a promising tool for developing orographic gravity wave drag schemes. However, the modeling of the propagation of orographic waves using standard ray theory in realistic background wind conditions usually ... -
Multiscale Asymptotics Analysis for the Mesoscale Dynamics of Cloud-Topped Boundary Layers
(American Meteorological Society, 2010)This paper presents the derivation of a model to explore the coupling between the dynamic and thermodynamic processes of a cloud-topped boundary layer on mesoscales using a formal multiscale asymptotic approach. The derived ... -
A Climatology of Rossby Wave Breaking on the Southern Hemisphere Tropopause
(American Meteorological Society, 2010)30-yr climatology of Rossby wave breaking (RWB) on the Southern Hemisphere (SH) tropopause is formed using 30 yr of reanalyses. Composite analysis of potential vorticity and meridional fluxes of wave activity show that RWB ... -
Spatially Variable Advection Correction of Radar Data. Part I: Theoretical Considerations
(American Meteorological Society, 2010)Radar data?based analysis products, such as accumulated rainfall maps, dual-Doppler wind syntheses, and thermodynamic retrievals, are prone to substantial error if the temporal sampling interval is too coarse. Techniques ... -
Particle Growth and Drop Collection Efficiency of Warm Clouds as Inferred from Joint CloudSat and MODIS Observations
(American Meteorological Society, 2010)This study describes an approach for combining CloudSat and Moderate Resolution Imaging Spectroradiometer (MODIS) satellite observations to investigate the microphysical processes of warm clouds on the global scale. MODIS ... -
The Resonant Excitation of Baroclinic Waves by the Divergent Circulation of Recurving Tropical Cyclones
(American Meteorological Society, 2010)This paper explores the hypothesis that a tropical cyclone (TC) may produce baroclinic waves through the divergent circulation that arises from its low-level inflow and upper-level outflow. The model setting is a ... -
Comments on “Atlantic Tropical Cyclogenetic Processes during SOP-3 NAMMA in the GEOS-5 Global Data Assimilation and Forecast System”
(American Meteorological Society, 2010) -
A Nonlinear Impedance Relation for the Surface Winds in Pressure Disturbances
(American Meteorological Society, 2010)The ?impedance relation? between the wind perturbation within an ageostrophic atmospheric disturbance and its pressure perturbation and intrinsic propagation speed has been in use for decades. The correlation between wind ... -
Quasigeostrophic Transient Wave Activity Flux: Updated Climatology and Its Role in Polar Vortex Anomalies
(American Meteorological Society, 2010)The climatology of transient wave activity flux defined by Plumb has been calculated for each calendar month, for high-frequency (HF) and low-frequency (LF) waves, using the NCAR?NCEP reanalyses for both hemispheres. Wave ... -
On the Propagation of Information and the Use of Localization in Ensemble Kalman Filtering
(American Meteorological Society, 2010)Several localized versions of the ensemble Kalman filter have been proposed. Although tests applying such schemes have proven them to be extremely promising, a full basic understanding of the rationale and limitations of ... -
Improvement and Implementation of a Parameterization for Shallow Cumulus in the Global Climate Model ECHAM5-HAM
(American Meteorological Society, 2011)A transient shallow-convection scheme is implemented into the general circulation model ECHAM5 and the coupled aerosol model HAM, developed at the Max Planck Institute for Meteorology in Hamburg. The shallow-convection ... -
The Role of Nonnormality in Overreflection Theory
(American Meteorological Society, 2010)The role of nonnormality in the overreflection of gravity waves is investigated. In the limit of weak stratification, wave packets having a critical level inside a shear layer of finite depth are reflected with amplified ... -
Genesis of Typhoon Chanchu (2006) from a Westerly Wind Burst Associated with the MJO. Part I: Evolution of a Vertically Tilted Precursor Vortex
(American Meteorological Society, 2010)Although previous studies have shown the relationship between the Madden?Julian oscillation (MJO) and tropical cyclogenesis (TCG), many scale-interactive processes leading to TCG still remain mysterious. In this study, the ... -
Helical Turbulence Prevails over Inertial Waves in Forced Rotating Flows at High Reynolds and Low Rossby Numbers
(American Meteorological Society, 2011)study of spectral laws for helical turbulence in the presence of solid body rotation up to Reynolds numbers Re ~ 1 ? 105 and down to Rossby numbers Ro ~ 3 ? 10?3 is presented. The forcing function is a fully helical flow ... -
Assimilation of Tropical Cyclone Track and Structure Based on the Ensemble Kalman Filter (EnKF)
(American Meteorological Society, 2010)A new tropical cyclone vortex initialization method based on the ensemble Kalman filter (EnKF) is proposed in this study. Three observed parameters that are related to the tropical cyclone (TC) track and structure?center ... -
The MJO and Convectively Coupled Waves in a Coarse-Resolution GCM with a Simple Multicloud Parameterization
(American Meteorological Society, 2010)The adequate representation of the dominant intraseasonal and synoptic-scale variability in the tropics, characterized by the Madden?Julian oscillation (MJO) and convectively coupled waves, is still problematic in current ... -
Desert Air Incursions, an Overlooked Aspect, for the Dry Spells of the Indian Summer Monsoon
(American Meteorological Society, 2010)The year 2009 was a major drought year for the Indian summer monsoon with a seasonal deficit of rainfall by 21.6%. Standard oceanic predictors such as ENSO and the Indian Ocean dipole are not consistent for these dry spells. ... -
Some Atmospheric Processes Governing the Large-Scale Tropical Circulation in Idealized Aquaplanet Simulations
(American Meteorological Society, 2010)The large-scale tropical atmospheric circulation is analyzed in idealized aquaplanet simulations using an atmospheric general circulation model. Idealized sea surface temperatures (SSTs) are used as lower-boundary conditions ...