| Validation Test Report for the 1/16 Degree Global NRL Layered Ocean Model Nowcast/Forecast System |
14 APR 2003 |
70 pages |
| Authors:
Robert C. Rhodes; Harley E. Hurlburt; Alan J. Wallcraft; E. J. Metzger; Jay F. Shriver; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
 | This report describes validation tests for the eddy-resolving 1/16 degree global Naval Research Laboratory (NRL) Layered Ocean Model (NLOM) nowcast/forecast system. For the nonassimilative model, maps of sea surface height (SSH) and sea surface temperature (SST) show that the model depicts the observed positions of the major fronts. Comparisons of model SSH variability with altimetry and correlations with tide-gauge SSH time series demonstrate ocean model skill. In addition, model comparisons ... |
|
| 1/32 DEGREE Global Ocean Modeling and Prediction |
2003 |
7 pages |
| Authors:
Jay Shriver; Harley E. Hurlburt; Ole M. Smedstad; Alan J. Wallcraft; Robert C. Rhodes; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| This DoD HPC Challenge project is a crucial component of an effort to develop a data-assimilative 1/320 global ocean nowcast/forecast system, which includes the associated basic research and exploratory development. The need for 1/320 resolution (-3.5 km at mid-latitudes) has been demonstrated through extensive research, including essential contributions from our FY97 and FY98/00 DoD HPC Challenge projects. The ocean model, after 30 years of climatological spinup, was run interannually spanning ... |
|
| Formulation of the NRL Layered Ocean Model in Spherical Coordinates |
14 AUG 1998 |
29 pages |
| Authors:
Daniel R. Moore; Alan J. Wallcraft; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEAN MONITORING AND PREDICTION SECTION
|
| This report describes NRL's hydrodynamic (isopycnal) nonlinear, primitive equation, ocean circulation model in a spherical layer suitable for a large basin or the global domain. This document should be read in conjunction with NOARL Report 35, December 1991, The Navy Layered Ocean Model User's Guide ?25!. Spherical geometry requires careful treatment of the equations of fluid dynamics to ensure spurious terms are not introduced during ... |
|
| A Scalable Implementation of the NRL Layered Ocean Model |
14 AUG 1998 |
35 pages |
| Authors:
Alan J. Wallcraft; Daniel R. Moore; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEAN MONITORING AND PREDICTION SECTION
|
| This report describes the portable scalable implementation of the NRL Layered Ocean Model (NLOM). Scalability is based primarily on the tiled data parallel, parallel programming paradigm. This is sufficiently general that the actual technique used on a given machine to obtain scalability can be selected at compile time from: (i) data parallel, (ii) SPMD message passing, (iii) autotasking, or (iv) SPMD message passing between multi-processor autotasked ... |
|
| A Comparison of Several Scalable Programming Models |
JUN 1998 |
17 pages |
| Authors:
Alan J. Wallcraft; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEAN MONITORING AND PREDICTION SECTION
|
| The NRL Layered Ocean Model (NLOM) is written in the tiled data parallel programming style, and uses an application specific programming interface to isolate operations that require communication. This allows different scalable programming models to be "plugged" into NLOM with relatively little effort. NLOM is similar to other OGCM's, except that it uses a direct Helmholtz's equation solver as part of its semi-implicit time scheme and typically runs with a ... |
|
| Global and Basin-Scale Ocean Modeling and Prediction |
1998 |
8 pages |
| Authors:
Alan J. Wallcraft; Harley E. Hurlburt; Robert C. Rhodes; Jay F. Shriver; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEAN MONITORING AND PREDICTION SECTION
|
| This DoD HPC Challenge project is part of a coordinated 6.1-6.4 effort on the "Grand Challenge" problem of eddy-resolving global and basin-scale ocean modeling and prediction. This project is work towards the ultimate goal of a data assimilative 1/32 deg global ocean nowcast/forecast system including the associated basic research and exploratory development. The interim goal by 2001 is the transition of a 1/8 deg global system with embedded 1/16 deg ... |
|
| A Scalable Implementation of the NRL Layered Ocean Model |
03 APR 97 |
35 pages |
| Authors:
Alan J. Wallcraft; Daniel R. Moore; PLANNING SYSTEMS INC SLIDELL LA
|
| This report describes the portable scalable implementation of the NRL Layered Ocean Model (NLOM). Scalability is based primarily on the tiled data parallel programming paradigm. This is sufficiently general that the actual technique used on a given machine to obtain scalability can be selected at compile time from: (1) data parallel, (2) SPMD message passing, (3) autotasking, or (4) SPMD message passing between multi-processor autotasked systems. The code is thus ... |
|
| Proceedings of the International Workshop on Numerical Prediction of Oceanic Variations Held in Tokyo, Japan on 7-11 Mar 1995. Dynamics of Eddy- Resolving Models of the Pacific Ocean and the Sea of Japan |
09 JUN 95 |
|
| Authors:
Harley E. Hurlburt; Patrick J. Hogan; E. J. Metzger; William J. Schmitz; Alan J. Wallcraft; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
|
| The Navy Layered Ocean Model Users Guide |
DEC 91 |
28 pages |
| Authors:
Alan J. Wallcraft; PLANNING SYSTEMS INC SLIDELL LA
|
| This report is a users guide to the Navy's hydrodynamic (isopycnal) nonlinear, primitive equation, layered ocean circulation model. The model retains the free surface and uses a semi-implicit time scheme that treats all gravity waves implicitly. It can handle full-scale bottom topography, provided it is confined to the lowest layer, and an arbitrary coastline geometry. The model has been in use at the Naval Oceanographic and Atmospheric Research Laboratory for ... |
|
| Navy Corrected Geostrophic Wind Set for the Gulf of Mexico |
MAR 85 |
|
| Authors:
Robert C. Rhodes; Alan J. Wallcraft; J. D. Thompson; JAYCOR ALEXANDRIA VA
|
 | The large variability of the Gulf of Mexico wind field indicates that high-resolution wind data will be required to represent the weather systems affecting ocean circulation. This report presents methods and results of the calculation of a corrected geostrophic wind data set with high temporal and spaticl resolution. Corrected geostrophic wind was calculated from surface pressure analyses compiled by the Fleet Numerical Oceanography Center. The correction factors for wind magnitude ... |
|
| Elliptic Solvers for NORDA Ocean Models and a Quasi-Geostrophic Regional Eddy-Mean Energetics Package |
12 AUG 1983 |
|
| Authors:
Alan J. Wallcraft; JAYCOR ALEXANDRIA VA
|
| All two dimensional Helmholtz solvers for rectangles at NORDA have been placed in one library with standardized naming and argument list conventions. Each solver has full internal documentation, test software for accuracy, timing and error conditions (such as incorrect dimensions, etc.). The internal documentation for three representative solvers (SMNUUH, SMNSUH and SMMSSH) is reproduced. To invoke a solver, two routines must be called. The first (e.g., CMNUUH) tests the correctness ... |
|
| Elliptic Equation Solvers for NORDA Ocean Models and a Study of Equatorial Ocean Dynamics |
02 JUN 1982 |
|
| Authors:
Alan J. Wallcraft; JAYCOR ALEXANDRIA VA
|
| Numerical experiments were performed in order to examine the generating mechanisms for equatorial Rossby solitons. It was shown that wind events representing a relaxation of the equatorial trades can generate these solitary waves subsequent to the reflection of the Kelvin wave from the eastern boundary. If the duration of the event is greater than one month, it is possible for multiple solitons to form. This is particularly true for large ... |
|
| Theoretical and Experimental Comparison of Four Vector Processors for Numerical Ocean Modeling |
DEC 1981 |
|
| Authors:
Alan J. Wallcraft; JAYCOR ALEXANDRIA VA
|
| Super computers are required for effective ocean simulation numerical experiments because of the time and space scales of the underlying physical processes. This report compares four such computers, the Texas Instruments Advanced Scientific Computer (TIASC), the CRAY-1, the Cyber 203 and the Cyber 205 entirely on the basis of their suitability for numerical ocean modeling. Using this as the basis for comparison, it is found that the Cyber 205 is ... |
|
Reports by Author
