Journal of the Atmospheric Sciences: Recent submissions
Now showing items 4401-4420 of 13215
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Size Spectra of Snow Particles Measured in Wintertime Precipitation in the Pacific Northwest
(American Meteorological Society, 2008)Particle size spectra collected by the University of Washington?s Convair-580 research aircraft at a variety of altitudes and temperatures in winter frontal and orographic precipitation systems during the Improvement of ... -
Connections between Potential Vorticity Intrusions and Convection in the Eastern Tropical Pacific
(American Meteorological Society, 2008)The connections between intrusions of stratospheric air into the upper troposphere and deep convection in the tropical eastern Pacific are examined using a combination of data analysis, potential vorticity (PV) inversion, ... -
The IMPROVE-1 Storm of 1–2 February 2001. Part III: Sensitivity of a Mesoscale Model Simulation to the Representation of Snow Particle Types and Testing of a Bulk Microphysical Scheme with Snow Habit Prediction
(American Meteorological Society, 2007)A mesoscale model simulation of a wide cold-frontal rainband observed in the Pacific Northwest during the Improvement of Microphysical Parameterization through Observational Verification Experiment (IMPROVE-1) field study ... -
The IMPROVE-1 Storm of 1–2 February 2001. Part IV: Precipitation Enhancement across the Melting Layer
(American Meteorological Society, 2008)Previous model simulations indicate that in stratiform precipitation, the precipitation rate can increase by 7% in the melting layer through direct condensation onto melting snow and the resultant cooled rain. In the present ... -
Vertical Transition in Transport and Mixing in Baroclinic Flows
(American Meteorological Society, 2008)Numerical simulations in multilevel baroclinic turbulence in a ?-plane channel model are discussed, focusing on the transport and mixing behavior. The temperature field in the model is relaxed toward a field consistent ... -
A New Bulk Shallow-Cumulus Model and Implications for Penetrative Entrainment Feedback on Updraft Buoyancy
(American Meteorological Society, 2008)A new refinement of Albrecht et al.?s bulk model for shallow-cumulus convection is presented. It is used to illuminate fundamental aspects of oceanic shallow-cumulus boundary layer structure, including updraft buoyancy and ... -
A Barotropic Model of the Angular Momentum–Conserving Potential Vorticity Staircase in Spherical Geometry
(American Meteorological Society, 2008)An idealized analytical model of the barotropic potential vorticity (PV) staircase is constructed, constrained by global conservation of absolute angular momentum, perfect homogenization of PV in mixing zones between ... -
Mean Climate and Variability of the Atmosphere and Ocean on an Aquaplanet
(American Meteorological Society, 2007)Numerical experiments are described that pertain to the climate of a coupled atmosphere?ocean?ice system in the absence of land, driven by modern-day orbital and CO2 forcing. Millennial time-scale simulations yield a mean ... -
Multiple Jets as PV Staircases: The Phillips Effect and the Resilience of Eddy-Transport Barriers
(American Meteorological Society, 2008)A review is given that focuses on why the sideways mixing of potential vorticity (PV) across its background gradient tends to be inhomogeneous, arguably a reason why persistent jets are commonplace in planetary atmospheres ... -
Generalized Stability of Nongeostrophic Baroclinic Shear Flow. Part II: Intermediate Richardson Number Regime
(American Meteorological Society, 2007)This work continues the generalized stability theory (GST) analysis of baroclinic shear flow in the primitive equations (PE), focusing on the regime in which the mean baroclinic shear and the stratification are of the same ... -
Limits, Variability, and General Behavior of Statistical Predictability of the Midlatitude Atmosphere
(American Meteorological Society, 2008)The nature of statistical predictability is analyzed in a T42 global atmospheric model that is able to adequately capture the main features of the midlatitude atmosphere. Key novel features of the present study include ... -
Aerosol–Cloud Interactions in a Mesoscale Model. Part I: Sensitivity to Activation and Collision–Coalescence
(American Meteorological Society, 2008)High-resolution numerical simulations of the aerosol?cloud feedbacks are performed with a mesoscale model. The multimodal aerosol species, added to the model, and the cloud species were represented by two spectral moments. ... -
Greenland’s Pressure Drag and the Atlantic Storm Track
(American Meteorological Society, 2007)Some effects of Greenland on the Northern Hemisphere wintertime circulation are discussed. Inviscid pressure drag on Greenland?s slopes, calculated from reanalysis data, is related to circulation patterns. Greenland lies ... -
Rossby Waves and Jets in Two-Dimensional Decaying Turbulence on a Rotating Sphere
(American Meteorological Society, 2007)Jet formation in decaying two-dimensional turbulence on a rotating sphere is reviewed from the viewpoint of Rossby waves. A series of calculations are performed to confirm the behavior of zonal mean flow generation on the ... -
Dynamics of Convectively Driven Banded Jets in the Laboratory
(American Meteorological Society, 2007)The banded organization of clouds and zonal winds in the atmospheres of the outer planets has long fascinated observers. Several recent studies in the theory and idealized modeling of geostrophic turbulence have suggested ... -
Axial Atmospheric Angular Momentum Budget at Diurnal and Subdiurnal Periodicities
(American Meteorological Society, 2008)The diurnal and subdiurnal variations of the mass and wind terms of the axial atmospheric angular momentum (AAM) are explored using a 1-yr integration of the Laboratoire de Météorologie Dynamique (LMDz) GCM, twelve 10-day ... -
Seasonality and Regionality of the Madden–Julian Oscillation, Kelvin Wave, and Equatorial Rossby Wave
(American Meteorological Society, 2007)The Madden?Julian oscillation (MJO), Kelvin wave, and equatorial Rossby (ER) wave?collectively called intraseasonal oscillations (ISOs)?are investigated using a 25-yr record of outgoing longwave radiation (OLR) measurements ... -
An Analysis of West African Dynamics Using a Linearized GCM
(American Meteorological Society, 2008)This study utilizes a linear, primitive equation spherical model to study the development and propagation of easterly wave disturbances over West Africa. Perturbations are started from an initial disturbance consisting of ... -
A Tropical and Subtropical Land–Sea–Atmosphere Drought Oscillation Mechanism
(American Meteorological Society, 2007)A two-column atmospheric model on a land?sea interface is studied. The model has sophisticated convection, cloud, and radiation schemes, a mixed layer ocean, and a bucket model to simulate land hydrology. A self-sustained ... -
Evaluating Clouds in Long-Term Cloud-Resolving Model Simulations with Observational Data
(American Meteorological Society, 2007)Two 20-day, continental midlatitude cases are simulated with a three-dimensional (3D) cloud-resolving model (CRM) and are compared to Atmospheric Radiation Measurement Program (ARM) data. Surface fluxes from ARM ground ...