@article{fdi:010040993,
  title = {{J}oint altimetric and in-situ data assimilation using the {GRACE} mean dynamic topography : a 1993-1998 hindcast experiment in the {T}ropical {P}acific {O}cean},
  author = {{C}astruccio, {F}. and {V}erron, {J}. and {G}ourdeau, {L}ionel and {B}rankart, {J}. {M}. and {B}rasseur, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he altimetric satellite signal is the sum of the geoid and the dynamic topography, but only the latter is relevant to oceanographic applications. {P}oor knowledge of the geoid has prevented oceanographers from fully exploiting altimetric measurements through its absolute component, and applications have concentrated on ocean variability through analyses of sea level anomalies. {R}ecent geodetic missions like {CHAMP}, {GRACE} and the forthcoming {GOCE} are changing this perspective. {I}n this study, data assimilation is used to reconstruct the {T}ropical {P}acific {O}cean circulation during the 1993-1996 period. {M}ultivariate observations are assimilated into a primitive equation ocean model ({OPA}) using a reduced order {K}alman filter (the {S}ingular {E}volutive {E}xtended {K}alman filter). {A} 6-year (1993-1998) hindcast experiment is analyzed and validated by comparison with observations. {I}n this experiment, the new capability offered by an observed absolute dynamic topography (built using the {GRACE} geoid to reference the altimetric data) is used to assimilate, in an efficient way, the in-situ temperature profiles from the {TAO}/{TRITON} moorings together with the {T}/{P} and {ERS}1&2 altimetric signal. {GRACE} data improves compatibility between both observation data sets. {T}he difficulties encountered in this regard in previous studies such as {P}arent et al. ({J} {M}ar {S}yst 40-41:381-401, 2003) are now circumvented. {T}his improvement helps provide more efficient data assimilation, as evidenced, by assessing the results against independent data. {T}his leads in particular to significantly more realistic currents and vertical thermal structures.},
  keywords = {},
  booktitle = {},
  journal = {{O}cean {D}ynamics},
  volume = {58},
  numero = {1},
  pages = {43--63},
  ISSN = {1616-7341},
  year = {2008},
  DOI = {10.1007/s10236-007-0131-4},
  URL = {https://www.documentation.ird.fr/hor/fdi:010040993},
}