Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3741-3760 of 13215
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Mechanisms Affecting the Transition from Shallow to Deep Convection over Land: Inferences from Observations of the Diurnal Cycle Collected at the ARM Southern Great Plains Site
(American Meteorological Society, 2010)Summertime observations for 11 yr from the Atmospheric Radiation Measurement (ARM) Climate Research Facility Southern Great Plains (SGP) site are used to investigate mechanisms controlling the transition from shallow to ... -
Cellular Statistical Models of Broken Cloud Fields. Part I: Theory
(American Meteorological Society, 2010)A new analytical statistical model describing the structure of broken cloud fields is presented. It depends on two parameters (cell size and occupancy probability) and provides chord distributions of clouds and gaps between ... -
Modeling Aerosol Impacts on Convective Storms in Different Environments
(American Meteorological Society, 2010)Aerosols are known to have both direct and indirect effects on clouds through their role as cloud condensation nuclei. This study examines the effects of differing aerosol concentrations on convective storms developing ... -
Extreme Events and the General Circulation: Observations and Stochastic Model Dynamics
(American Meteorological Society, 2010)This study explores the dynamical role of non-Gaussian potential vorticity variability (extreme events) in the zonally averaged circulation of the atmosphere within a stochastic framework. First the zonally averaged skewness ... -
On the Role of Sloping Terrain in the Forcing of the Great Plains Low-Level Jet
(American Meteorological Society, 2010)The summertime Great Plains low-level jet (LLJ) has been the subject of numerous investigations during the past several decades. Characteristics of the LLJ include nighttime development of a pronounced wind maximum of ... -
Self-Acceleration in the Parameterization of Orographic Gravity Wave Drag
(American Meteorological Society, 2010)A new effect related to the evaluation of momentum deposition in conventional parameterizations of orographic gravity wave drag (GWD) is considered. The effect takes the form of an adjustment to the basic-state wind about ... -
Turbulence Closure Parameterization and Grid Spacing Effects in Simulated Supercell Storms
(American Meteorological Society, 2010)Many meteorological organizations plan to substantially increase the resolution of the limited-area models used for severe weather prediction. Such an approach does not guarantee a priori the reduction of the uncertainty ... -
Using Different Formulations of the Transformed Eulerian Mean Equations and Eliassen–Palm Diagnostics in General Circulation Models
(American Meteorological Society, 2010)Transformed Eulerian mean (TEM) equations and Eliassen?Palm (EP) flux diagnostics are presented for the general nonhydrostatic, fully compressible, deep atmosphere formulation of the primitive equations in spherical geometric ... -
Structure of AGCM-Simulated Convectively Coupled Kelvin Waves and Sensitivity to Convective Parameterization
(American Meteorological Society, 2010)A study of the convectively coupled Kelvin wave (CCKW) properties from a series of atmospheric general circulation model experiments over observed sea surface temperatures is presented. The simulations are performed with ... -
The Deepening of Tropical Convection by Congestus Preconditioning
(American Meteorological Society, 2010)The role of environmental moisture in the deepening of cumulus convection is investigated by means of cloud-resolving numerical experiments. Under idealized conditions of uniform SST and specified radiative cooling, the ... -
Modal and Nonmodal Growths of Symmetric Perturbations in Unbounded Domain
(American Meteorological Society, 2010)Modal and nonmodal growths of nonhydrostatic symmetric perturbations in an unbounded domain are examined in comparison with their hydrostatic counterparts. It is shown that the modal growth rate is a function of a single ... -
Interactions among ENSO, the Monsoon, and Diurnal Cycle in Rainfall Variability over Java, Indonesia
(American Meteorological Society, 2010)Using a high-resolution regional climate model?the Abdus Salam International Centre for Theoretical Physics Regional Climate Model version 3 (RegCM3)?and station and satellite observations, the authors have studied the ... -
The Role of the Central Asian Mountains on the Midwinter Suppression of North Pacific Storminess
(American Meteorological Society, 2010)he role of the central Asian mountains on North Pacific storminess is examined using an atmospheric general circulation model by varying the height and the areas of the mountains. A series of model integrations show that ... -
Spatial Pattern and Zonal Shift of the North Atlantic Oscillation. Part I: A Dynamical Interpretation
(American Meteorological Society, 2010)This paper presents a possible dynamical explanation for why the North Atlantic Oscillation (NAO) pattern exhibits an eastward shift from the period 1958?77 (P1) to the period 1978?97 (P2) or 1998?2007 (P3). First, the ... -
Snow Studies. Part I: A Study of Natural Variability of Snow Terminal Velocity
(American Meteorological Society, 2010)The variability and the uncertainties in snowfall velocity measurements are addressed in this study. The authors consider (i) the instrumental uncertainty in the fall velocity measurement, (ii) the effect of unstable falling ... -
Spatial Pattern and Zonal Shift of the North Atlantic Oscillation. Part II: Numerical Experiments
(American Meteorological Society, 2010)In this part, the spatial evolution of an initial dipole anomaly in a prescribed jet is at first investigated by numerically solving linear and nonlinear models without forcing in order to examine how the spatial pattern ... -
The Occurrence of Particle Size Distribution Bimodality in Midlatitude Cirrus as Inferred from Ground-Based Remote Sensing Data
(American Meteorological Society, 2010)ata collected in midlatitude cirrus clouds by instruments on jet aircraft typically show particle size distributions that have distinct distribution modes in both the 10?30-?m maximum dimension (D) size range and the ... -
On Sedimentation and Advection in Multimoment Bulk Microphysics
(American Meteorological Society, 2010)In two-moment bulk microphysics schemes, the practice of using different weighted fall velocities for the various moments is known to lead to artificial growth in reflectivity values for fast-falling particles, particularly ... -
In Situ Chemical Characterization of Aged Biomass-Burning Aerosols Impacting Cold Wave Clouds
(American Meteorological Society, 2010)During the Ice in Clouds Experiment?Layer Clouds (ICE-L), aged biomass-burning particles were identified within two orographic wave cloud regions over Wyoming using single-particle mass spectrometry and electron microscopy. ... -
Convectively Coupled Waves in a Sheared Environment
(American Meteorological Society, 2010)A linear stability analysis, about a radiative?convective equilibrium in a sheared environment, on an equatorial beta plane, for a simple multicloud model for organized tropical convection is presented here. Both ...