Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3001-3020 of 13215
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Sensitivity of Tropical Cyclone Forecasts as Revealed by Singular Vectors
(American Meteorological Society, 2006)Singular vector (SV) sensitivity, calculated using the adjoint model of the U.S. Navy Operation Global Atmosphere Prediction System (NOGAPS), is used to study the dynamics associated with tropical cyclone evolution. For ... -
Exploring Self-Correlation in Flux–Gradient Relationships for Stably Stratified Conditions
(American Meteorological Society, 2006)In this paper, the degree of scatter in flux?gradient relationships for stably stratified conditions is analyzed. It is generally found that scatter in the dimensionless lapse rate ?h is larger than in the dimensionless ... -
Testing and Comparing the Modified Anomalous Diffraction Approximation
(American Meteorological Society, 2006)The modified anomalous diffraction approximation (MADA) is used to predict absorption and extinction in water and ice clouds, but it does not predict the scattering phase function or asymmetry parameter g. In conjunction ... -
The Role of Land–Sea Topography in Blocking Formation in a Block–Eddy Interaction Model
(American Meteorological Society, 2006)This paper is an extension of a theoretical study by Luo on the effect of large-scale land?sea contrast (LSC) topography on the formation of an eddy-driven blocking. It is found that the topography term can be included ... -
Mechanisms Supporting Long-Lived Episodes of Propagating Nocturnal Convection within a 7-Day WRF Model Simulation
(American Meteorological Society, 2006)A large-domain explicit convection simulation is used to investigate the life cycle of nocturnal convection for a one-week period of successive zonally propagating heavy precipitation episodes occurring over the central ... -
Classification of Ice Crystal Shapes in Midlatitude Ice Clouds from Three Years of Lidar Observations over the SIRTA Observatory
(American Meteorological Society, 2006)This paper presents a study of ice crystal shapes in midlatitude ice clouds inferred from a technique based on the comparison of ray-tracing simulations with lidar depolarization ratio measured at 532 nm. This technique ... -
Prediction and Diagnosis of Tropical Cyclone Formation in an NWP System. Part II: A Diagnosis of Tropical Cyclone Chris Formation
(American Meteorological Society, 2006)This is the second of a three-part investigation into tropical cyclone (TC) genesis in the Australian Bureau of Meteorology?s Tropical Cyclone Limited Area Prediction System (TC-LAPS). The primary TC-LAPS vortex enhancement ... -
Two-Dimensional Spectra in the Atmospheric Boundary Layer
(American Meteorological Society, 2006)One-dimensional spectra are frequently used to relate features of measured and simulated meteorological field variables in the turbulent atmospheric boundary layer (ABL), but two-dimensional spectra can provide more reliable ... -
The Roles of the Hadley Circulation and Downward Control in Tropical Upwelling
(American Meteorological Society, 2006)Several idealized models of tropical upwelling are presented in order to clarify the roles of the nonlinear Hadley circulation and extratropical wave driving. In particular, it is shown that the Hadley circulation and ... -
Surface Cyclones in the ERA-40 Dataset (1958–2001). Part I: Novel Identification Method and Global Climatology
(American Meteorological Society, 2006)A novel method is introduced to generate climatological frequency distributions of meteorological features from gridded datasets. The method is used here to derive a climatology of extratropical cyclones from sea level ... -
Precipitation over Concave Terrain
(American Meteorological Society, 2006)Many topographic barriers are comprised of a series of concave or convex ridges that modulate the intensity and distribution of precipitation over mountainous areas. In this model-based idealized study, stratiform precipitation ... -
Circulation Sensitivity to Tropopause Height
(American Meteorological Society, 2006)The possibility that the tropopause could be lower during an ice-age cooling leads to an examination of the general sensitivity of global circulations to the tropopause height by altering a constant stratospheric temperature ... -
Effect of Stable Layer Formation over the Po Valley on the Development of Convection during MAP IOP-8
(American Meteorological Society, 2006)During intensive observation period (IOP)-8 of the Mesoscale Alpine Program, there was a stable layer of air in the lowest levels of the Po Valley and just upstream of the Apennines. In this study, the effects of the stable ... -
The Mysteries of Mammatus Clouds: Observations and Formation Mechanisms
(American Meteorological Society, 2006)Mammatus clouds are an intriguing enigma of atmospheric fluid dynamics and cloud physics. Most commonly observed on the underside of cumulonimbus anvils, mammatus also occur on the underside of cirrus, cirrocumulus, ... -
Prediction and Diagnosis of Tropical Cyclone Formation in an NWP System. Part I: The Critical Role of Vortex Enhancement in Deep Convection
(American Meteorological Society, 2006)This is the first of a three-part investigation into tropical cyclone (TC) genesis in the Australian Bureau of Meteorology?s Tropical Cyclone Limited Area Prediction System (TC-LAPS), an operational numerical weather ... -
A Unified Perspective on the Dynamics of Axisymmetric Hurricanes and Monsoons
(American Meteorological Society, 2006)This paper provides a unified perspective on the dynamics of hurricane- and monsoonlike vortices by identifying them as specific limiting cases of a more general flow system. This more general system is defined as stationary ... -
A Study of Cloud Mixing and Evolution Using PDF Methods. Part I: Cloud Front Propagation and Evaporation
(American Meteorological Society, 2006)The evolution of mean relative humidity (RH) is studied in an isobaric system of clear and cloudy air mixed by an incompressible velocity field. A constant droplet radius assumption is employed that implies a simple ... -
Multiscale Temporal Variability of Warm-Season Precipitation over North America: Statistical Analysis of Radar Measurements
(American Meteorological Society, 2006)Directionally averaged time series of precipitation rates for eight warm seasons (1996?2003) over the continental United States derived from Next Generation Weather Radar (NEXRAD) measurements are analyzed using spectral ... -
Orographic Influences on Subtropical Stratocumulus
(American Meteorological Society, 2006)The impact of South American orography on subtropical stratocumulus clouds off the Peruvian coast is investigated in the context of an atmospheric general circulation model. It is found that stratocumulus incidence is ... -
Efficient Monte Carlo Methods for Radiative Transfer Modeling
(American Meteorological Society, 2006)Demands for Monte Carlo radiative transfer modeling have grown with the increase in computational power in recent decades. This method provides realistic simulations of radiation processes for various types of application, ...