Article (Scientific journals)
Enhancing temporal correlations in EOF expansions for the reconstruction of missing data using DINEOF
Alvera Azcarate, Aïda; Barth, Alexander; Sirjacobs, Damien et al.
2009In Ocean Science, 5 (4), p. 475-485
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Keywords :
DINEOF; Missing data; Filter; Sea surface temperature; Black Sea
Abstract :
[en] DINEOF (Data Interpolating Empirical Orthogonal Functions) is an EOF-based technique for the reconstruction of missing data in geophysical fields, such as those produced by clouds in sea surface temperature satellite images. A technique to reduce spurious time variability in DINEOF reconstructions is presented. The reconstruction of these images within a long time series using DINEOF can lead to large discontinuities in the reconstruction. Filtering the temporal covariance matrix allows to reduce this spurious variability and therefore more realistic reconstructions are obtained. The approach is tested in a three years sea surface temperature data set over the Black Sea. The effect of the filter in the temporal EOFs is presented, as well as some examples of the improvement achieved with the filtering in the SST reconstruction, both compared to the DINEOF approach without filtering.
Research Center/Unit :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Disciplines :
Earth sciences & physical geography
Author, co-author :
Alvera Azcarate, Aïda  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)
Barth, Alexander  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie physique
Sirjacobs, Damien ;  Université de Liège - ULiège > Département des sciences de la vie > Algologie, mycologie et systématique expérimentale
Beckers, Jean-Marie  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie physique
Language :
English
Title :
Enhancing temporal correlations in EOF expansions for the reconstruction of missing data using DINEOF
Publication date :
2009
Journal title :
Ocean Science
ISSN :
1812-0784
eISSN :
1812-0792
Publisher :
European Geosciences Union
Volume :
5
Issue :
4
Pages :
475-485
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Available on ORBi :
since 23 October 2009

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