Reference : Generation of analysis and consistent error fields using the Data Interpolating Variation...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/125731
Generation of analysis and consistent error fields using the Data Interpolating Variational Analysis (Diva)
English
[fr] Generation de champs d'analyse et d'erreur cohérents à l'aide de l'Interpolation de Données par Analyse Variationelle (Diva)
Troupin, Charles mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER) >]
Barth, Alexander mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER) >]
Sirjacobs, Damien mailto [Université de Liège - ULg > Département des sciences de la vie > Phylogénomique des eucaryotes >]
Ouberdous, Mohamed mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER) >]
Brankart, Jean-Michel [> >]
Brasseur, Pierre [> >]
Rixen, Michel [> >]
Alvera Azcarate, Aïda mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER) >]
Belounis, Mahdia [> >]
Capet, Arthur mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
Lenartz, Fabian [> >]
Toussaint, Marie-Eve [> >]
Beckers, Jean-Marie mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER) >]
Aug-2012
Ocean Modelling
Elsevier Science
52-53
90-101
Yes
International
1463-5003
Oxford
United Kingdom
[en] Diva ; Climatology ; Seadatanet ; Interpolation ; Salinity ; Mediterranean Sea
[en] The Data Interpolating Variational Analysis (Diva) is a method designed to interpolate irregularly-spaced, noisy data onto any
desired location, in most cases on regular grids. It is the combination of a particular methodology, based on the minimisation of a
cost function, and a numerically efficient method, based on a finite-element solver. The cost function penalises the misfit between
the observations and the reconstructed field, as well as the regularity or smoothness of the field.
The intrinsic advantages of the method are its natural way to take into account topographic and dynamic constraints (coasts,
advection, . . . ) and its capacity to handle large data sets, frequently encountered in oceanography. The method provides gridded
fields in two dimensions, usually in horizontal layers. Three-dimension fields are obtained by stacking horizontal layers.
In the present work, we summarize the background of the method and describe the possible methods to compute the error field
associated to the analysis. In particular, we present new developments leading to a more consistent error estimation, by determining
numerically the real covariance function in Diva, which is never formulated explicitly, contrarily to Optimal Interpolation. The real
covariance function is obtained by two concurrent executions of Diva, the first providing the covariance for the second. With this
improvement, the error field is now perfectly consistent with the inherent background covariance in all cases.
A two-dimension application using salinity measurements in the Mediterranean Sea is presented. Applied on these measurements, Optimal Interpolation and Diva provided very similar gridded fields (correlation: 98.6%, RMS of the difference: 0.02). The
method using the real covariance produces an error field similar to the one of OI, except in the coastal areas.
Centre Interfacultaire de Recherches en Océanologie - MARE
Union Européenne = European Union - UE = EU
Seadatanet2
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/125731
10.1016/j.ocemod.2012.05.002
http://www.sciencedirect.com/science/article/pii/S1463500312000790
FP7 ; 283607 - SEADATANET II - SeaDataNet II: Pan-European infrastructure for ocean and marine data management

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