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Validation of the 1/12 degree Arctic Cap Nowcast/Forecast System (ACNFS)
O. M. Smedstad(1), P.G. Posey(2), R.A. Allard(2), E.J. Metzger(2), A.J. Wallcraft(2), M.W. Phelps (3)
(1)QinetiQ North America, (2)Naval Research Laboratory, (3)Jacobs Engineering
(Abstract received 12/13/2010 for session X)
ABSTRACT
The Naval Research Laboratory (NRL) has developed a two-way coupled ice-ocean system based on the HYbrid Coordinate Ocean Model (HYCOM) coupled via the Earth System Modeling Framework (ESMF) to the Los Alamos Community Ice CodE (CICE). The data assimilation capability consists of the Navy Coupled Ocean Data Assimilation (NCODA) 3DVAR system. NCODA assimilates observations from satellite altimeter tracks, SST, sea ice concentration and in situ observations, including profile data from BT's and Argo floats. The Arctic Cap Nowcast/Forecast System (ACNFS) is configured on a 1/12 degree grid with resolution of ~3.5 km near the pole. Both the ocean and ice model use the Fleet Numerical Meteorology and Oceanography Center 3-hourly 0.5 degree atmospheric forcing from the Navy's Operational Global Atmospheric Prediction System (NOGAPS). Boundary conditions are provided by the real time 1/12 degree global model. The system has been validated against unassimilated observational data sets of ice drift, ice thickness and ice edge location. ACNFS provides the Naval Oceanographic Office with an improved ice modelling capability until the global 1/12 degree HYCOM nowcast/forecast system is coupled to CICE.
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2011 LOM Workshop, Miami, Florida February 7 - 9, 2011