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Author: Martin Ehrendorfer Publisher: SIAM ISBN: 1611971993 Category : Mathematics Languages : en Pages : 503
Book Description
This book provides a comprehensive overview of numerical weather prediction (NWP) focusing on the application of the spectral method in NWP models. The author illustrates the use of the spectral method in theory as well as in its application to building a full prototypical spectral NWP model, from the formulation of continuous model equations through development of their discretized forms to coded statements of the model. The author describes the implementation of a specific model - PEAK (Primitive-Equation Atmospheric Research Model Kernel) - to illustrate the steps needed to construct a global spectral NWP model. The book brings together all the spectral, time, and vertical discretization aspects relevant for such a model. It provides readers with information necessary to construct spectral NWP models; a self-contained, well-documented, coded spectral NWP model; and theoretical and practical exercises, some of which include solutions.
Author: T.N. Krishnamurti Publisher: Springer Science & Business Media ISBN: 0387302549 Category : Science Languages : en Pages : 328
Book Description
This is an introductory textbook on global spectral modeling designed for senior-level undergraduates and possibly for first-year graduate students. This text starts with an introduction to elementary finite-difference methods and moves on towards the gradual description of sophisticated dynamical and physical models in spherical coordinates. Computational aspects of the spectral transform method, the planetary boundary layer physics, the physics of precipitation processes in large-scale models, the radiative transfer including effects of diagnostic clouds and diurnal cycle, the surface energy balance over land and ocean, and the treatment of mountains are some issues that are addressed. The topic of model initialization includes the treatment of normal modes and physical processes. A concluding chapter covers the spectral energetics as a diagnostic tool for model evaluation. This revised second edition of the text also includes three additional chapters. Chapter 11 deals with the formulation of a regional spectral model for mesoscale modeling which uses a double Fourier expansion of data and model equations for its transform. Chapter 12 deals with ensemble modeling. This is a new and important area for numerical weather and climate prediction. Finally, yet another new area that has to do with adaptive observational strategies is included as Chapter 13. It foretells where data deficiencies may reside in model from an exploratory ensemble run of experiments and the spread of such forecasts.
Author: Jacobus Willem Bakker Publisher: Springer ISBN: Category : Science Languages : en Pages : 724
Book Description
"This volume is based on the "School/Workshop on Linear Time, Branching Time and Partial Order in Logics and Models for Concurrency" organized by the editors and held in the period May 30-June 3, 1988 at Noordwijkerhout, The Netherlands. The School/Workshop was an activity of the project REX - Research and Education in Concurrent Systems. The volume contains tutorials and research contributions to the three approaches - linear time, - branching time, and - partial order in semantics and proof theory of concurrent programs by the main specialists in this field. It promotes an in-depth understanding of the relative merits and disadvantages of these three approaches. An introduction to the recent literature on the subject is provided by the invited research contributions.''--Publisher's website.
Author: David Gottlieb Publisher: SIAM ISBN: 0898710235 Category : Technology & Engineering Languages : en Pages : 167
Book Description
A unified discussion of the formulation and analysis of special methods of mixed initial boundary-value problems. The focus is on the development of a new mathematical theory that explains why and how well spectral methods work. Included are interesting extensions of the classical numerical analysis.
Author: Publisher: ISBN: Category : Long-range weather forecasting Languages : en Pages : 0
Book Description
This report documents the ten-year (1981-91) development of the Phillips Laboratory Global Spectral Model (PL GSM). Beginning with the National Meteorological Center Model of 1980, the hydrodynamics of the model were recoded and new physical parameterizations were developed for radiation, planetary boundary layer, cumulus convection, and gravity wave drag effects on the large- scale forecast fields. A sequence of tests and parameterization refinements were carried out to arrive ultimately at the current version of the PL GSM, termed PL-91. The report describes its performance with respect to that of the operational AFGWC GSM in a series of six January and June forecasts. The PL-91 version appears to produce better forecasts of virtually all parameters, producing small systematic errors and slower error growth. The model is envisioned to serve as a research tool to develop techniques for global cloud forecasting.
Author: Michael T. Montgomery Publisher: ISBN: 9781423553168 Category : Cyclones Languages : en Pages : 68
Book Description
In recent years, numerical weather prediction models have progressed from finite difference methods to spectral methods in order to obtain more accurate forecasts in less computational time. A switch from "pure" finite difference to "pure" spectral techniques, however, may not be the best approach in all cases. Indeed, for some problems a mixed approach with finite difference approximations in one coordinate and spectral approximations in the remaining coordinates may provide comparably accurate results in less computational time than either pure method alone. This is particularly evident for the case of a hurricane where a state of near-circular symmetry typically prevails. For such a problem, a semi-spectral (SS) method using finite difference approximations in the radial direction and spectral methods in the azimuthal direction is a natural choice. While the effectiveness of pure methods for certain problems in fluid dynamics and atmospheric dynamics is well documented, comparatively little work has been undertaken to examine the effectiveness of SS schemes. This is particularly evident in problems concerning the vorticity dynamics of the hurricane near-core region. Because of the nearly circular flow of a strong hurricane, we hypothesize that SS formulations may prove useful in helping to elucidate the asymmetric vorticity dynamics in the hurricane's near-core region. This study examines the effectiveness of the semi-spectral approach for two classes of problems. The first problem concerns the redistribution of vorticity anomalies within a "master" vortex possessing a vorticity profile which decreases monotonically with radius. The second problem concerns barotropic instability, vortex breakdown, and vorticity mixing that is observed in mature hurricanes.
Author: Martin Ehrendorfer
Author: Martin Ehrendorfer
Author: Martin Ehrendorfer
Author: Donald C. Norquist
Author: T.N. Krishnamurti
Author: Lee Michael Grenci
Author: Jacobus Willem Bakker
Author: David Gottlieb
Author: Donald C. Norquist
Author: 
Author: Michael T. Montgomery