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Geostrophic Adjustment and Inverse Cascades in Rotating Stratified Turbulence
Publisher: American Meteorological Society
Abstract: Rotating stratified turbulence is examined both numerically and analytically, guided by energy and potential enstrophy conservation as well as resonant interaction theory, in order to investigate the cascade properties of ...
Inertial Ranges and Small-Scale Intermittency in One-Dimensional Turbulence Models
Publisher: American Meteorological Society
Abstract: A set of one-dimensional turbulence models can be constructed by applying severe D-1 directional Fourier truncation to the D-dimensional fluid equations, allowing for numerical calculation over an extremely wide range of ...
Sampling Errors in Ensemble Kalman Filtering. Part I: Theory
Publisher: American Meteorological Society
Abstract: This paper discusses the quality of the analysis given by the ensemble Kalman filter in a perfect model context when ensemble sizes are limited. The overall goal is to improve the theoretical understanding of the problem ...
Sampling Errors in Ensemble Kalman Filtering. Part II: Application to a Barotropic Model
Publisher: American Meteorological Society
Abstract: In the current study, the authors are concerned with the comparison of the average performance of stochastic versions of the ensemble Kalman filter with and without covariance inflation, as well as the double ensemble ...
The Cost-Effectiveness of Semi-Lagrangian Advection
Publisher: American Meteorological Society
Abstract: The purpose of this paper is to ascertain the cost-effectiveness of semi-Lagrangian advection schemes for a wide variety of geophysical flows at all scales. The approach used is first to determine the minimum computational ...
Geostrophic versus Wave Eddy Viscosities in Atmospheric Models
Publisher: American Meteorological Society
Abstract: It is well established that at low Rossby and Froude numbers modes possessing potential vorticity behave differently from gavity-inertial wave modes. Wave energy cascades relatively more efficiently downscale to the ...
Assimilation with an Ensemble Kalman Filter of Synthetic Radial Wind Data in Anisotropic Turbulence: Perfect Model Experiments
Publisher: American Meteorological Society
Abstract: The ensemble Kalman filter (EnKF) developed at the Meteorological Research Branch of Canada is used in the context of synthetic radial wind data assimilation at the mesoscale. A dry Boussinesq model with periodic boundary ...
Turbulence Effects of Collision Efficiency and Broadening of Droplet Size Distribution in Cumulus Clouds
Publisher: American Meteorological Society
Abstract: AbstractThis paper aims to investigate and quantify the turbulence effect on droplet collision efficiency and explore the broadening mechanism of the droplet size distribution (DSD) in cumulus clouds. The sophisticated ...
On Boussinesq Dynamics near the Tropopause
Publisher: American Meteorological Society
Abstract: AbstractThe near-tropopause energy spectrum closely follows a ?5/3 power law at mesoscales. Most theories addressing the mesoscale spectrum assume unbalanced dynamics but ignore the tropopause (near which the bulk of the ...
Cloud Droplet Collisions in Turbulent Environment: Collision Statistics and Parameterization
Publisher: American Meteorological Society
Abstract: he purpose of this paper is to quantify the influence of turbulence in collision statistics by separately studying the impacts of computational domain sizes, eddy dissipation rates (EDRs), and droplet sizes and eventually ...
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