Benchmarking Ocean Circulation Models On Massively Parallel Computers
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Author | : |
Publisher | : |
Total Pages | : 7 |
Release | : 1997 |
Genre | : |
ISBN | : |
General circulation models are becoming the premier theoretical tools for studying the complex structure of the global climate. GEONET was envisioned as exercising the resources developed for the nuclear weapons program to address environmental problems. The similarity of circulation models to weapons codes made them an attractive field for them to develop expertise. The author hoped to become an active player in mainline climate research through computer simulation. This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The intention of this research was to establish the Laboratory in mainstream climate research in conjunction with the GEONET project.
Author | : |
Publisher | : |
Total Pages | : 7 |
Release | : 1996 |
Genre | : |
ISBN | : |
Over the last three years, very significant advances have been made in refining the grid resolution of ocean models and in improving the physical and numerical treatments of ocean hydrodynamics. Some of these advances have occurred as a result of the successful transition of ocean models onto massively parallel computers, which has been led by Los Alamos investigators. Major progress has been made in simulating global ocean circulation and in understanding various ocean climatic aspects such as the effect of wind driving on heat and freshwater transports. These steps have demonstrated the capability to conduct realistic decadal to century ocean integrations at high resolution on massively parallel computers.
Author | : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development |
Publisher | : |
Total Pages | : 1436 |
Release | : 1996 |
Genre | : Energy development |
ISBN | : 9780160526411 |
Author | : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development |
Publisher | : |
Total Pages | : 1464 |
Release | : 1996 |
Genre | : Energy development |
ISBN | : |
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 48 |
Release | : 2018-05-29 |
Genre | : |
ISBN | : 9781720459163 |
A multivariate ensemble Kalman filter (MvEnKF) implemented on a massively parallel computer architecture has been implemented for the Poseidon ocean circulation model and tested with a Pacific Basin model configuration. There are about two million prognostic state-vector variables. Parallelism for the data assimilation step is achieved by regionalization of the background-error covariances that are calculated from the phase-space distribution of the ensemble. Each processing element (PE) collects elements of a matrix measurement functional from nearby PEs. To avoid the introduction of spurious long-range covariances associated with finite ensemble sizes, the background-error covariances are given compact support by means of a Hadamard (element by element) product with a three-dimensional canonical correlation function. The methodology and the MvEnKF configuration are discussed. It is shown that the regionalization of the background covariances; has a negligible impact on the quality of the analyses. The parallel algorithm is very efficient for large numbers of observations but does not scale well beyond 100 PEs at the current model resolution. On a platform with distributed memory, memory rather than speed is the limiting factor.Keppenne, Christian L. and Rienecker, Michele M. and Koblinsky, Chester (Technical Monitor)Goddard Space Flight CenterPARALLEL PROCESSING (COMPUTERS); OCEAN MODELS; OCEAN CURRENTS; KALMAN FILTERS; STATE VECTORS; PARALLEL COMPUTERS; MULTIVARIATE STATISTICAL ANALYSIS; ERRORS; COVARIANCE; ARCHITECTURE (COMPUTERS)
Author | : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development |
Publisher | : |
Total Pages | : 1262 |
Release | : 1997 |
Genre | : Energy development |
ISBN | : |
Author | : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development |
Publisher | : |
Total Pages | : 1278 |
Release | : 1997 |
Genre | : Energy development |
ISBN | : |
Author | : James J. O'Brien |
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Total Pages | : |
Release | : 1994 |
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ISBN | : |
Author | : D.L.T. Anderson |
Publisher | : Springer Science & Business Media |
Total Pages | : 616 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9400910134 |
This book which is the outcome of a NATO-Advanced Study Institute on Mod elling the Ocean Circulation and Geochemical Tracer Transport is concerned with using models to infer the ocean circulation. Understanding our climate is one of the major problems of the late twentieth century. The possible climatic changes resulting from the rise in atmospheric carbon dioxide and other trace gases are of primary interest and the ocean pla. ys a ma. jor role in determining the magnitude, temporal evolution and regional distribution of those changes. Because of the poor observational basis the ocean general circulation is not well understood. The World Ocean Circulation Experiment (WOCE) which is now underway is an attempt to improve our knowledge of ocean dynamics and thermodynamics on global scales relevant to climate change. Despite those efforts, the oceanic data base is likely to remain scarce and it is crucial to use appropriate methods in order to extract the maximum amount of information from observations. The book contains a thorough analysis of methods to combine data of val'ious types with dynamical concepts, and to assimilate data directly into ocean models. The properties of geocl;temical tracers such as HC, He, Tritium and Freons and how they may be used to impose integral constraints on the ocean circulation are discussed.
Author | : Stephen A. Jarvis |
Publisher | : Springer |
Total Pages | : 303 |
Release | : 2014-09-30 |
Genre | : Computers |
ISBN | : 3319102141 |
This book constitutes the refereed proceedings of the 4th International Workshop, PMBS 2013 in Denver, CO, USA in November 2013. The 14 papers presented in this volume were carefully reviewed and selected from 37 submissions. The selected articles broadly cover topics on massively parallel and high-performance simulations, modeling and simulation, model development and analysis, performance optimization, power estimation and optimization, high performance computing, reliability, performance analysis, and network simulations.