Towards a high-resolution global coupled navy prediction system

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Author
McClean, Julie L.
Thoppil, Prasad
Ivanova, Detelina
Stark, Donald
Maltrud, Mathew
Hunke, Elizabeth
May, Paul
Carton, James
Giese, Benjamin
Date
2004-06Metadata
Show full item recordAbstract
A computational project is underway to bring about the realization of a high-resolution global
coupled atmosphere/ocean/ice prediction system for Navy meteorological and oceanographic
forecasting. A fully coupled near-global ocean/atmosphere prediction system has been constructed
using resolutions of 0.75° in the atmosphere and 0.5° in the ocean (eddy-permitting) at the Naval
Research Laboratory at Monterey (NRL-MRY). The system consists of the Navy Operational Global
Atmospheric System (NOGAPS) that incorporates the NRL Atmospheric Variational Data Assimilation
Scheme (NAVDAS), the Los Alamos National Laboratory Parallel Ocean Program (POP), and the Navy
Coupled Ocean Data Assimilation (NCODA), an optimal interpolation scheme (see Figure l). The next
steps in the development of this system are the inclusion of ice, improving the data assimilation
scheme, and moving to higher resolution; fulfillment of these goals is being advanced by university
and national laboratory partners. An eddy-permitting fully global coupled ocean/ice simulation is
underway using POP and the Los Alamos sea ice model known as CICE. Ensemble runs are being
conducted using eddy permitting global POP and the Simple Ocean Data Assimilation Scheme (SODA).
SODA (Carton et al., 2000), also an optimal interpolation scheme, uses advanced error statistics
that are flow dependent, anisotropic, and latitude-depth dependent. Finally, a short (two-year)
high-resolution (0.1°, 40-level) global POP simulation forced with daily NOGAPS fluxes is complete
following a 2-decade spin-up of this model using National Center for Environmental Prediction (NCEP) atmospheric fluxes.
POP, the ocean model common to all these efforts, is a multi-level, primitive equation general
circulation model with a free surface boundary condition. POP has been used widely on massively
parallel architectures since 1992 when (Smith et al., 1992) reconfigured the Bryan Cox-Semtner
("GFDL") ocean model: to run on a Connection Machine 5 (CMS). Since then it has been ported to
other platforms (SGI Origin 2000, SGI Origin 3000, Cray T3E, and IBM SP, Cray X I , Earth
Simulator, among others) and LANL scientists continue to improve its efficiency. Improvements to
physics packages by the modeling community at large are progressively incorporated into POP.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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