Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2501-2520 of 13215
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Air and Surface Temperature Coupling in the Convective Atmospheric Boundary Layer
(American Meteorological Society, 2011)n a convective boundary layer, coherent structures were detected through their thermal signature on an artificial turf surface using high-frequency thermal infrared (TIR) imagery and surface layer turbulence measurements. ... -
Spectrally Invariant Approximation within Atmospheric Radiative Transfer
(American Meteorological Society, 2011)ertain algebraic combinations of single scattering albedo and solar radiation reflected from, or transmitted through, vegetation canopies do not vary with wavelength. These ?spectrally invariant relationships? are the ... -
An Eddy Diffusivity–Mass Flux Approach to the Vertical Transport of Turbulent Kinetic Energy in Convective Boundary Layers
(American Meteorological Society, 2011)n this study a new approach to the vertical transport of the turbulent kinetic energy (TKE) is proposed. The principal idea behind the new parameterization is that organized updrafts or convective plumes play an important ... -
Impacts of Lapse Rates on Low-Level Rotation in Idealized Storms
(American Meteorological Society, 2011)diabatic lapse rates appear to be a common feature in the lower troposphere on tornado days. This article reviews physical reasons why lapse rates may influence surface vortex intensification and reports on numerical ... -
Model Study of Intermediate-Scale Tropical Inertia–Gravity Waves and Comparison to TWP-ICE Campaign Observations
(American Meteorological Society, 2011)2-day inertia?gravity wave (IGW) was observed in high-resolution radiosonde soundings of horizontal wind and temperature taken during the 2006 Tropical Warm Pool?International Cloud Experiment (TWP-ICE) experiment in the ... -
Droplet Activation and Mixing in Large-Eddy Simulation of a Shallow Cumulus Field
(American Meteorological Society, 2011)his paper presents the application of a double-moment bulk warm-rain microphysics scheme to the simulation of a field of shallow convective clouds based on Barbados Oceanographic and Meteorological Experiment (BOMEX) ... -
A FIRE-ACE/SHEBA Case Study of Mixed-Phase Arctic Boundary Layer Clouds: Entrainment Rate Limitations on Rapid Primary Ice Nucleation Processes
(American Meteorological Society, 2011)bservations of long-lived mixed-phase Arctic boundary layer clouds on 7 May 1998 during the First International Satellite Cloud Climatology Project (ISCCP) Regional Experiment (FIRE)?Arctic Cloud Experiment (ACE)/Surface ... -
Nonlinear Dynamics and Regional Variations in the MJO Skeleton
(American Meteorological Society, 2011)minimal, nonlinear oscillator model is analyzed for the Madden?Julian oscillation (MJO) ?skeleton? (i.e., its fundamental features on intraseasonal/planetary scales), which includes the following: (i) a slow eastward phase ... -
Moist Dynamics of Severe Monsoons over South Asia: Role of the Tropical SST
(American Meteorological Society, 2011)iagnostics from observations and multicentury integrations of a coupled model [Geophysical Fluid Dynamics Laboratory (GFDL) coupled model version 2.1 (CM2.1)] indicate that about 65% of the severe monsoons (rainfall > 1.5 ... -
A PV Perspective on the Vertical Structure of Mature Midlatitude Cyclones in the Northern Hemisphere
(American Meteorological Society, 2011)evelopment of extratropical cyclones can be seen as an interplay of three positive potential vorticity anomalies: an upper-level stratospheric intrusion, low-tropospheric diabatically produced potential vorticity (PV), and ... -
A Cloud-Resolving Simulation Study on the Merging Processes and Effects of Topography and Environmental Winds
(American Meteorological Society, 2011)he cloud-resolving fifth-generation Pennsylvania State University?National Center for Atmospheric Research Mesoscale Model (MM5) was used to study the cloud interactions and merging processes in the real case that generated ... -
El Niño–Southern Oscillation in Tropical and Midlatitude Column Ozone
(American Meteorological Society, 2011)he impacts of El Niño?Southern Oscillation (ENSO) on the tropical total column ozone, the tropical tropopause pressure, and the 3.5-yr ozone signal in the midlatitude total column ozone were examined using the Goddard Earth ... -
Sensitivity, Structure, and Dynamics of Singular Vectors Associated with Hurricane Helene (2006)
(American Meteorological Society, 2011)he sensitivity of singular vectors (SVs) associated with Hurricane Helene (2006) to resolution and diabatic processes is investigated. Furthermore, the dynamics of their growth are analyzed. The SVs are calculated using ... -
Dynamics of the Lower Stratospheric Circulation Response to ENSO
(American Meteorological Society, 2011)robust feature of the observed response to El Niño?Southern Oscillation (ENSO) is an altered circulation in the lower stratosphere. When sea surface temperatures (SSTs) in the tropical Pacific are warmer there is enhanced ... -
Persistent Circulation Regimes and Preferred Regime Transitions in the North Atlantic
(American Meteorological Society, 2011)he persistent regime behavior of the eddy-driven jet stream over the North Atlantic is investigated. The North Atlantic jet stream variability is characterized by the latitude of the maximum lower tropospheric wind speed ... -
Impacts of Idealized Air–Sea Coupling on Madden–Julian Oscillation Structure in the Superparameterized CAM
(American Meteorological Society, 2011)ir?sea interactions and their impact on intraseasonal convective organization are investigated by comparing two 5-yr simulations from the superparameterized Community Atmosphere Model version 3.0 (SP-CAM). The first is ... -
Rossby Wave Scales, Propagation, and the Variability of Eddy-Driven Jets
(American Meteorological Society, 2011)he eddy-driven jet is located in the midlatitudes, bounded on one side by the pole and often bounded on the opposite side by a strong Hadley-driven jet. This work explores how the eddy-driven jet and its variability persist ... -
Comparing Aerosol and Low-Level Moisture Influences on Supercell Tornadogenesis: Three-Dimensional Idealized Simulations
(American Meteorological Society, 2011)our three-dimensional, nested-grid numerical simulations were performed using the Regional Atmospheric Modeling System (RAMS) to compare the effects of aerosols acting as cloud condensation nuclei (CCN) to those of low-level ... -
Macroturbulent Equilibration in a Thermally Forced Primitive Equation System
(American Meteorological Society, 2011)major question for climate studies is to quantify the role of turbulent eddy fluxes in maintaining the observed ocean?atmosphere state. It has been argued that eddy fluxes keep the midlatitude atmosphere in a state that ... -
Convective Momentum Transport in a Simple Multicloud Model for Organized Convection
(American Meteorological Society, 2011)onvective momentum transport (CMT) is the process of vertical transport of horizontal momentum by convection onto the environmental flow. The significance of CMT from mesoscale to synoptic- and planetary-scale organized ...