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RISThe Filtering of Meteorological Fields
Publisher: American Meteorological Society
Abstract: A generalization of the popular Shapiro filters is described which allows the suppression of a broader band of frequencies near the sampling limit corresponding to two-grid-length waves. Applications to high-order finite ...
Accuracy Considerations of Time-Splitting Methods for Models Using Two-Time-Level Schemes
Publisher: American Meteorological Society
A Duality Principle in Semigeostrophic Theory
Publisher: American Meteorological Society
Abstract: The semigeostrophic equations are a filtered approximation to the primitive equations that have been applied with considerable success to the study of atmospheric frontogenesis and, increasingly, to the study of the influence ...
Three-Dimensional Mass-Conserving Semi-Lagrangian Scheme Employing Forward Trajectories
Publisher: American Meteorological Society
Abstract: Through the use of the dimensional splitting ?cascade? method of grid-to-grid interpolation, it is shown that consistently high-order-accurate semi-Lagrangian integration of a three-dimensional hydrostatic primitive equations ...
Recursive Filter Objective Analysis of Meteorological Fields: Applications to NESDIS Operational Processing
Publisher: American Meteorological Society
Abstract: A recursive filter objective analysis method is described. It is a "successive approximation" system with the particular feature of locally varying scaling, making it especially appropriate for dealing with inhomogeneous ...
Three-Dimensional Variational Analysis with Spatially Inhomogeneous Covariances
Publisher: American Meteorological Society
Abstract: In this study, a global three-dimensional variational analysis system is formulated in model grid space. This formulation allows greater flexibility (e.g., inhomogeneity and anisotropy) for background error statistics. A ...
Retrieval of Moisture from Simulated GPS Slant-Path Water Vapor Observations Using 3DVAR with Anisotropic Recursive Filters
Publisher: American Meteorological Society
Abstract: Anisotropic recursive filters are implemented within a three-dimensional variational data assimilation (3DVAR) framework to efficiently model the effect of flow-dependent background error covariance. The background error ...
A Nonhydrostatic Multiscale Model on the Uniform Jacobian Cubed Sphere
Publisher: American Meteorological Society
Abstract: he rapid expansion of contemporary computers is expected to enable operational integrations of global models of the atmosphere at resolutions close to 1 km, using tens of thousands of processors in the foreseeable future. ...
Variational Correction of Aircraft Temperature Bias in the NCEP’s GSI Analysis System
Publisher: American Meteorological Society
Abstract: arious studies have noted that aircraft temperature data have a generally warm bias relative to radiosonde data around 200 hPa. In this study, variational aircraft temperature bias correction is incorporated in the Gridpoint ...
Expansion of the All-Sky Radiance Assimilation to ATMS at NCEP
Publisher: American Meteorological Society
Abstract: AbstractSince the implementation of all-sky radiance assimilation of the Advanced Microwave Sounding Unit-A (AMSU-A) in the operational hybrid 4D ensemble?variational Global Forecast System at NCEP in 2016, the all-sky ...