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Estimation of systematic error in an equatorial ocean model using data assimilation
Author(s) -
Martin M. J.,
Bell M. J.,
Nichols N. K.
Publication year - 2002
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.298
Subject(s) - data assimilation , forcing (mathematics) , equator , systematic error , permission , ocean general circulation model , meteorology , assimilation (phonology) , climatology , general circulation model , mathematics , geology , geodesy , physics , statistics , latitude , oceanography , linguistics , philosophy , climate change , political science , law
Assimilation of temperature observations into an ocean model near the equator often results in a dynamically unbalanced state with unrealistic overturning circulations. The way in which these circulations arise from systematic errors in the model or its forcing is discussed. A scheme is proposed, based on the theory of state augmentation, which uses the departures of the model state from the observations to update slowly evolving bias fields. Results are summarized from an experiment applying this bias correction scheme to an ocean general circulation model. They show that the method produces more balanced analyses and a better fit to the temperature observations. © Crown copyright 2002. Reproduced with the permission of Her Majesty's Stationery Office. Published by John Wiley & Sons, Ltd.