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Evaluation of the 1/12 degree global HYCOM/NCODA nowcast/forecast system
O. M. Smedstad, J. A. Cummings, E. J. Metzger, H. E. Hurlburt, A. J. Wallcraft, D. S. Franklin, J. F. Shriver, P. G. Thoppil
QinetiQ North America
(Abstract received 05/05/2009 for session X)
ABSTRACT
The 1/12 degree global HYCOM nowcast/forecast system has been running daily since 22 December 2006. With ~7km mid latitude resolution (3-4 km near the poles), the system depicts the location of mesoscale features such as ocean eddies and fronts and provide the three dimensional ocean temperature, salinity and current structure. The Navy Coupled Ocean Data Assimilation (NCODA) system is used to assimilate available observations. NCODA is a multivariate optimal interpolation scheme (MVOI) that assimilates surface observations from satellite altimeter tracks and available MCSST data. NCODA also assimilates in situ observations, including profile data from BT\'s and ARGO floats. An incremental updating scheme is used to update the HYCOM forecast variables. Typically a 6 hour updating interval is used. A NCODA analysis is performed every 24 hours. The daily run consists of a 5 day hindcast and up to a 5 day forecast.The system will be described and the evaluation of results from a hindcast as well as the real time system will be presented. Results from the global system can be viewed on the HYCOM web page http://www.hycom.org/. The data can also be accessed through this web page.
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2009 LOM Workshop, Miami, Florida Jume 1 - 3, 2009