Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4241-4260 of 13215
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Wind–Evaporation Feedback and Abrupt Seasonal Transitions of Weak, Axisymmetric Hadley Circulations
(American Meteorological Society, 2008)For an imposed thermal forcing localized off the equator, it is known that conservation of absolute angular momentum in axisymmetric flow produces a nonlinear response once the forcing exceeds a critical amplitude. It is ... -
A Buoyancy–Vorticity Wave Interaction Approach to Stratified Shear Flow
(American Meteorological Society, 2008)Motivated by the success of potential vorticity (PV) thinking for Rossby waves and related shear flow phenomena, this work develops a buoyancy?vorticity formulation of gravity waves in stratified shear flow, for which the ... -
The Tropospheric Jet Response to Prescribed Zonal Forcing in an Idealized Atmospheric Model
(American Meteorological Society, 2008)This paper explores the tropospheric jet shift to a prescribed zonal torque in an idealized dry atmospheric model with high stratospheric resolution. The jet moves in opposite directions for torques on the jet?s equatorward ... -
Piecewise Potential Vorticity Inversion: Elementary Tests
(American Meteorological Society, 2008)Piecewise potential vorticity inversion (PPVI) is widely accepted as a useful tool in atmospheric diagnostics. This method is thought to quantify the instantaneous interaction at a distance of anomalies of potential vorticity ... -
Aspects of Precipitation Development in Trade Wind Cumulus Revealed by Differential Reflectivity at S Band
(American Meteorological Society, 2008)Early radar echo development in trade wind cumulus clouds is studied using the equivalent reflectivity factor Ze combined with the differential reflectivity Zdr. The clouds studied are among the largest of trade wind ... -
Finescale Structure and Dynamics of an Atmospheric Temperature Interface
(American Meteorological Society, 2008)Near-ground observations of an atmospheric temperature interface in the stable nocturnal boundary layer are reported. The thermal effect of the interface passage was a 5-K decrease in temperature during a 5-min period in ... -
Mountain Waves in Two-Layer Sheared Flows: Critical-Level Effects, Wave Reflection, and Drag Enhancement
(American Meteorological Society, 2008)Internal gravity waves generated in two-layer stratified shear flows over mountains are investigated here using linear theory and numerical simulations. The impact on the gravity wave drag of wind profiles with constant ... -
On Simultaneous Data-Based Dimension Reduction and Hidden Phase Identification
(American Meteorological Society, 2008)A problem of simultaneous dimension reduction and identification of hidden attractive manifolds in multidimensional data with noise is considered. The problem is approached in two consecutive steps: (i) embedding the ... -
Symmetric Stability of Compressible Zonal Flows on a Generalized Equatorial β Plane
(American Meteorological Society, 2008)Sufficient conditions are derived for the linear stability with respect to zonally symmetric perturbations of a steady zonal solution to the nonhydrostatic compressible Euler equations on an equatorial ? plane, including ... -
Gravity Wave Refraction by Three-Dimensionally Varying Winds and the Global Transport of Angular Momentum
(American Meteorological Society, 2008)Operational gravity wave parameterization schemes in GCMs are columnar; that is, they are based on a ray-tracing model for gravity wave propagation that neglects horizontal propagation as well as refraction by horizontally ... -
Dynamical Relationship between the Phase of North Atlantic Oscillations and the Meridional Excursion of a Preexisting Jet: An Analytical Study
(American Meteorological Society, 2008)In this paper, it is shown from an analytical solution that in the presence of a preexisting jet the interaction between the zonal jet and the topography of the land?sea contrast (LSC) in the Northern Hemisphere (NH) tends ... -
A Warm Rain Microphysics Parameterization that Includes the Effect of Turbulence
(American Meteorological Society, 2008)A warm rain parameterization has been developed by solving the stochastic collection equation with the use of turbulent collision kernels. The resulting parameterizations for the processes of autoconversion, accretion, and ... -
Wave-Driven Wind Jets in the Marine Atmospheric Boundary Layer
(American Meteorological Society, 2008)The interaction between ocean surface waves and the overlying wind leads to a transfer of momentum across the air?sea interface. Atmospheric and oceanic models typically allow for momentum transfer to be directed only ... -
Reply
(American Meteorological Society, 2008)Doswell has proposed a mechanism for mammatus called double-diffusive convection, the mechanism responsible for salt fingers in the ocean. The physics of salt fingers and mammatus are different. Unlike the ocean where the ... -
Emergence and Secondary Instability of Ekman Layer Rolls
(American Meteorological Society, 2008)The authors revisit the idealized scenario by which long-lived rolls are believed to emerge in the neutral planetary boundary layer, that is, through the saturation of the shear instability of the neutrally stratified Ekman ... -
On the Instability of the African Easterly Jet and the Generation of African Waves: Reversals of the Potential Vorticity Gradient
(American Meteorological Society, 2008)The relationship between the generation of African easterly waves and instability growing in regions with reversed potential vorticity gradients is studied using a regional climate model. Results indicate that the convective ... -
Rossby Wave Ray Tracing in a Barotropic Divergent Atmosphere
(American Meteorological Society, 2008)The effects of divergence on low-frequency Rossby wave propagation are examined by using the two-dimensional Wentzel?Kramers?Brillouin (WKB) method and ray tracing in the framework of a linear barotropic dynamic system. ... -
An Empirical Parameterization of Heterogeneous Ice Nucleation for Multiple Chemical Species of Aerosol
(American Meteorological Society, 2008)A novel, flexible framework is proposed for parameterizing the heterogeneous nucleation of ice within clouds. It has empirically derived dependencies on the chemistry and surface area of multiple species of ice nucleus ... -
Observations and Modeling of the Surface Aerosol Radiative Forcing during UAE2
(American Meteorological Society, 2008)Aerosol radiative forcing in the Persian Gulf region is derived from data collected during the United Arab Emirates (UAE) Unified Aerosol Experiment (UAE2). This campaign took place in August and September of 2004. The ... -
Structure and Formation of an Annular Hurricane Simulated in a Fully Compressible, Nonhydrostatic Model—TCM4
(American Meteorological Society, 2008)The structure and formation of an annular hurricane simulated in a fully compressible, nonhydrostatic tropical cyclone model?TCM4?are analyzed. The model is initialized with an axisymmetric vortex on an f plane in a quiescent ...