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Submitted on: 25 April 2012.
Revised on: 05 July 2012.
Accepted on: 15 July 2012.
___________________Journal of Operational Oceanography
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Submitted on: 18 November 2004.
Revised on: 27 January 2005.
Accepted on: 02 March 2005.
___________________Journal of Operational Oceanography
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