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Real time HYCOM nowcast/forecast systems
O. M. Smedstad, J. A. Cummings, E. J. Metzger, H. E. Hurlburt, A. J. Wallcraft, J. F. Shriver, P. J. Hogan, E. P. Chassignet
Planning Systems Inc.
(Abstract received 07/12/2007 for session X)
ABSTRACT
The 1/12 degree global HYCOM nowcast/forecast system has been running in near real time since 22 December 2006 and in real time since 16 February 2007. A 1/25 degree Gulf of Mexico (GOM) system has been running in real time since 25 October 2006. The Navy Coupled Ocean Data Assimilation (NCODA) system is used to assimilate available observTations. 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. The increments can be added over a given number of time steps, ranging from 1 (direct insertion) to the number of time steps in one day. 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 in the case of the global system a 4 day forecast. A 7 day forecast is performed with the GOM system. The systems will be described and the latest developments and results from the nowcast/forecast systems will be shown. 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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2007 LOM Workshop, Bergen, Norway, August 20-22, 2007