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RISA Normal-Mode Analysis of Rapid Teleconnections in a Numerical Weather Prediction Model. Part I: Global Aspects
Publisher: American Meteorological Society
Abstract: Global-scale interactions between the tropics and extratropics are investigated using a version of tile U.S. Navy's global operational numerical weather prediction model. The primary goals of this study are 1) to demonstrate ...
A Normal-Mode Analysis of Rapid Teleconnections in a Numerical Weather Prediction Model. Part II: Tropical and Extratropical Aspects
Publisher: American Meteorological Society
Abstract: A unique analysis is applied to the normal modes of the U.S. Navy's global operational numerical weather prediction model to investigate time-varying responses in the tropics and extratropics to tropical Pacific sea surface ...
The Effect of Model Bias on the Equatorward Propagation of Extratropical Waves
Publisher: American Meteorological Society
Abstract: The effect of model bias on the equatorward propagation of extratropical waves in a GCM simulation is assessed within the context of simple wave-guiding principles. The modes representing these waves are identified through ...
Observation Sensitivity Calculations Using the Adjoint of the Gridpoint Statistical Interpolation (GSI) Analysis System
Publisher: American Meteorological Society
Abstract: The adjoint of a data assimilation system provides an efficient way of estimating sensitivities of analysis or forecast measures with respect to observations. The NASA Global Modeling and Assimilation Office (GMAO) has ...
A Parameterization Technique for Nonlinear Spectral Models
Publisher: American Meteorological Society
Abstract: The feasibility of developing an objective parameterization technique is examined for general nonlinear hydrodynamical systems. The typical structure of these hydrodynamical systems, regardless of their complexity, is one ...
The Forcing and Balance of Zonally Symmetric Modes in a Global Model
Publisher: American Meteorological Society
Abstract: The temporal behavior of the zonal wavenumber 0 Hadley modes in the U.S. Navy's operational numerical weather prediction model is investigated. Time series of individual gravitational normal modes are examined in forecasts ...
Observed and Simulated Northern Hemisphere Intraseasonal Circulation Anomalies and the Effluence of Model Bias
Publisher: American Meteorological Society
Abstract: The ability of an atmospheric general circulation model to simulate the observed primary modes of intraseasonal variability in the Northern Hemisphere upper-tropospheric winds during boreal winter is examined. The model ...
Singular Vector Calculations with an Analysis Error Variance Metric
Publisher: American Meteorological Society
Abstract: Singular vectors of the navy's global forecast model are calculated using an initial norm consistent with an estimate of analysis error variance provided by the Naval Research Laboratory's (NRL) Atmospheric Variational ...
Cloud Coverage in the Joint OSSE Nature Run
Publisher: American Meteorological Society
Abstract: successful observing system simulation experiment (OSSE) is fundamentally dependent on the simulation of the global observing system used in the experiment. In many applications, a free-running numerical model simulation, ...
A Determination of Balanced Normal Modes for Two Models
Publisher: American Meteorological Society
Abstract: Two versions of the NOGAPS model are used to generate normal-mode balanced datasets. The various forces that act on gravitational modes are then examined to determine the modes whose coefficient time tendencies are ...