Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2781-2800 of 13215
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On the Dynamic Interpretation of the Virtual Temperature
(American Meteorological Society, 2007)The concept of virtual temperature is reviewed and extended into the definition of the dynamic virtual temperature, which is the temperature that a parcel of dry air should have in order to experience the same acceleration ... -
Observations of Freezing Drizzle in Extratropical Cyclonic Storms during IMPROVE-2
(American Meteorological Society, 2007)Observations of supercooled drizzle aloft within two storms impacting the Oregon Cascades during the second Improvement of Microphysical Parameterization through Observational Verification Experiment (IMPROVE-2) field ... -
Dynamics of Eddy-Driven Low-Frequency Dipole Modes. Part III: Meridional Displacement of Westerly Jet Anomalies during Two Phases of NAO
(American Meteorological Society, 2007)In this paper, the north?south variability of westerly jet anomalies during the two phases of the North Atlantic Oscillation (NAO) is examined in a theoretical model. It is found that the north?south variability of the ... -
Sensitivity of the Latitude of the Surface Westerlies to Surface Friction
(American Meteorological Society, 2007)The sensitivity to surface friction of the latitude of the surface westerlies and the associated eddy-driven midlatitude jet is studied in an idealized dry GCM. The westerlies move poleward as the friction is reduced in ... -
PIV Measurements in the Atmospheric Boundary Layer within and above a Mature Corn Canopy. Part I: Statistics and Energy Flux
(American Meteorological Society, 2007)Particle image velocimetry (PIV) measurements just within and above a mature corn canopy have been performed to clarify the small-scale spatial structure of the turbulence. The smallest resolved scales are about 15 times ... -
PIV Measurements in the Atmospheric Boundary Layer within and above a Mature Corn Canopy. Part II: Quadrant-Hole Analysis
(American Meteorological Society, 2007)Quadrant-hole (Q-H) analysis is applied to PIV data acquired just within and above a mature corn canopy. The Reynolds shear stresses, transverse components of vorticity, as well as turbulence production and cascading part ... -
Linear Anelastic Equations for Atmospheric Vortices
(American Meteorological Society, 2007)A linear anelastic-vortex model is derived using assumptions appropriate to waves on vortices with scales similar to tropical cyclones. The equation set is derived through application of a multiple-scaling technique, such ... -
Empirical Master Equations. Part I: Numerical Properties
(American Meteorological Society, 2007)In the atmospheric sciences, master equations are mainly used in a discrete time approximation to provide forecasts of the probability density function in a discretized phase space spanned by a few climate variables. The ... -
Tropical Cyclone Intensification from Asymmetric Convection: Energetics and Efficiency
(American Meteorological Society, 2007)Prior studies of the linear response to asymmetric heating of a balanced vortex showed that the resulting intensity change could be very closely approximated by computing the purely symmetric response to the azimuthally ... -
Numerical Study of Precipitation Core-Gap Structure along Cold Fronts
(American Meteorological Society, 2007)The mechanism responsible for the core-gap structure of precipitation along narrow cold-frontal rainbands (NCFRs) is investigated through analyses of idealized cloud-resolving simulations of cold fronts. The control ... -
Cloud-Resolving Model Simulations of KWAJEX: Model Sensitivities and Comparisons with Satellite and Radar Observations
(American Meteorological Society, 2007)Three-dimensional cloud-resolving model simulations of a mesoscale region around Kwajalein Island during the Kwajalein Experiment (KWAJEX) are performed. Using observed winds along with surface and large-scale thermodynamic ... -
The Dynamics of Northern Hemisphere Stratospheric Final Warming Events
(American Meteorological Society, 2007)A lag composite analysis is performed of the zonal-mean structure and dynamics of Northern Hemisphere stratospheric final warming (SFW) events. SFW events are linked to distinct zonal wind deceleration signatures in the ... -
Intraseasonal Variability of the Zonal-Mean Tropical Tropopause Height
(American Meteorological Society, 2007)Intraseasonal variability of the zonal-mean tropical tropopause height is shown to be modulated by localized tropical convection. Most of this convective activity is identified as being part of the Madden?Julian oscillation. ... -
Blocking and Rossby Wave Breaking on the Dynamical Tropopause in the Southern Hemisphere
(American Meteorological Society, 2007)Rossby wave breaking on the dynamical tropopause in the Southern Hemisphere (the ?2-PVU surface) is investigated using the ERA-40 dataset. The indication of wave breaking is based on reversal in the meridional gradient of ... -
On the Growth of Layers of Nonprecipitating Cumulus Convection
(American Meteorological Society, 2007)A prototype problem of a nonprecipitating convective layer growing into a layer of uniform stratification and exponentially decreasing humidity is introduced to study the mechanism by which the cumulus-topped boundary layer ... -
Structure of the Annual-Mean Equatorial Planetary Waves in the ERA-40 Reanalyses
(American Meteorological Society, 2007)The three-dimensional structure of the annual-mean equatorial planetary waves in the 40-yr ECMWF Re-Analysis (ERA-40) is documented. The features in the free atmosphere are predominantly equatorially symmetric, driven by ... -
Dynamics of the Stationary Anomalies Associated with the Interannual Variability of the Midwinter Pacific Storm Track—The Roles of Tropical Heating and Remote Eddy Forcing
(American Meteorological Society, 2007)The leading mode of interannual variability of the midwinter Pacific storm track is such that the storm track is weaker during the winters when the Pacific jet is strong, and stronger when the jet is weak. In this paper, ... -
Comparison of Bulk and Bin Warm-Rain Microphysics Models Using a Kinematic Framework
(American Meteorological Society, 2007)This paper discusses the development and testing of a bulk warm-rain microphysics model that is capable of addressing the impact of atmospheric aerosols on ice-free clouds. Similarly to previous two-moment bulk schemes, ... -
Interannual Variability in the Southern Hemisphere Circulation Organized by Stratospheric Final Warming Events
(American Meteorological Society, 2007)A composite observational analysis is presented demonstrating that austral stratospheric final warming (SFW) events provide a substantial organizing influence upon the large-scale atmospheric circulation in the Southern ... -
Wave Energy Associated with the Variability of the Stratospheric Polar Vortex
(American Meteorological Society, 2007)A study is performed on the energetics of planetary wave forcing associated with the variability of the northern winter polar vortex. The analysis relies on a three-dimensional normal mode expansion of the atmospheric ...