Combining Argo profiles with a general circulation model in the North Atlantic. Part 2: Realistic transports and improved hydrography, between spring 2002 and spring 2003

Type Article
Date 2008
Language English
Author(s) Forget Gael1, 3, Mercier HerleORCID2, 3, Ferron Bruno2, 3
Affiliation(s) 1 : MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA.
2 : CNRS Ifremer UBO, UMR 6523, Lab Phys Oceans, F-29280 Plouzane, France.
Source Ocean Modelling (1463-5003) (Elsevier), 2008 , Vol. 20 , N. 1 , P. 17-34
DOI 10.1016/j.ocemod.2007.06.002
WOS© Times Cited 12
Keyword(s) General circulation model, Argo, In situ observations, 4DVAR, Data assimilation
Abstract A set of Argo profiles collected in the North Atlantic between May 2002 and April 2003 is combined with a low-resolution general circulation model (GCM) using the adjoint method. Fitting the real hydrographic observations leads to vast improvements in the model circulation., including the sea surface height and the meridional heat transport. We find striking differences in basin-scale transports compared with previous assimilation experiments that use the same GCM and a similar spatial resolution. Based on forward modeling studies, it is argued that these differences are due to different assimilation experiment durations. Over 1 year, the hydrography interpolated with the GCM from Argo profiles better represents the contemporary structures than does a long-term averaged climatology. The GCM dynamics are robust enough to distinguish between contemporary hydrography and climatological hydrography.
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