AustralieFrV1, Main, Exploration, bibRecord, 006D44

An independent component analysis filtering approach for estimating continental hydrology in the GRACE gravity data

Identifieur interne : 006D44 ( Main/Exploration ); précédent : 006D43; suivant : 006D45

An independent component analysis filtering approach for estimating continental hydrology in the GRACE gravity data

Auteurs : Frédéric Frappart [France] ; Guillaume Ramillien [France] ; Marc Leblanc [Australie] ; Sarah O. Tweed [Australie] ; Marie-Paule Bonnet [France] ; Philippe Maisongrande [France]

Source :

Remote sensing of environment [ 0034-4257 ] ; 2011.

RBID : Pascal:11-0231429

Descripteurs français

Pascal (Inist)
- Analyse composante indépendante, Filtrage, Hydrologie, Gravité, Donnée, Satellite, Solution, Signal, Ondulation, Filtre, Utilisation, Inverse, Composante, Champ gravimétrique, Indépendance, Masse eau, Carte monde, Stockage eau, 2002, 2009, Monde, Mesure in situ, Série temporelle, Eau, Méthode, Bassin Murray Darling, Australie.
Wicri :
- geographic : Australie.
- topic : Hydrologie, Satellite, Eau.

English descriptors

KwdEn :
- 2002, 2009, Australia, Filter, Gravity, Independence, Independent component analysis, Inverse, Measurement in situ, Method, Time series, Water mass, components, data, filtering, global, global maps, gravity field, hydrology, satellites, signals, solution, undulation, utilization, water, water storage.

Abstract

An approach based on Independent Component Analysis (ICA) has been applied on a combination of monthly GRACE satellite solutions computed from official providers (CSR, JPL and GFZ), to separate useful geophysical signals from important striping undulations. We pre-filtered the raw GRACE Level-2 solutions using Gaussian filters of 300, 400, 500-km of radius to verify the non-Gaussianity condition which is necessary to apply the ICA. This linear inverse approach ensures to separate components of the observed gravity field which are statistically independent. The most energetic component found by ICA corresponds mainly to the contribution of continental water mass change. Series of ICA-estimated global maps of continental water storage have been produced over 08/2002-07/2009. Our ICA estimates were compared with the solutions obtained using other post-processing of GRACE Level-2 data, such as destriping and Gaussian filtering, at global and basin scales. Besides, they have been validated with in situ measurements in the Murray-Darling Basin. Our computed ICA grids are consistent with the different approaches. Moreover, the ICA-derived time series of water masses showed less north-south spurious gravity signals and improved filtering of unrealistic hydrological features at the basin-scale compared with solutions obtained using other filtering methods.

Affiliations:

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Le document en format XML

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<term>global maps</term>
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<term>Satellite</term>
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<term>Signal</term>
<term>Ondulation</term>
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<term>Utilisation</term>
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<front><div type="abstract" xml:lang="en">An approach based on Independent Component Analysis (ICA) has been applied on a combination of monthly GRACE satellite solutions computed from official providers (CSR, JPL and GFZ), to separate useful geophysical signals from important striping undulations. We pre-filtered the raw GRACE Level-2 solutions using Gaussian filters of 300, 400, 500-km of radius to verify the non-Gaussianity condition which is necessary to apply the ICA. This linear inverse approach ensures to separate components of the observed gravity field which are statistically independent. The most energetic component found by ICA corresponds mainly to the contribution of continental water mass change. Series of ICA-estimated global maps of continental water storage have been produced over 08/2002-07/2009. Our ICA estimates were compared with the solutions obtained using other post-processing of GRACE Level-2 data, such as destriping and Gaussian filtering, at global and basin scales. Besides, they have been validated with in situ measurements in the Murray-Darling Basin. Our computed ICA grids are consistent with the different approaches. Moreover, the ICA-derived time series of water masses showed less north-south spurious gravity signals and improved filtering of unrealistic hydrological features at the basin-scale compared with solutions obtained using other filtering methods.</div>
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An independent component analysis filtering approach for estimating continental hydrology in the GRACE gravity data

An independent component analysis filtering approach for estimating continental hydrology in the GRACE gravity data

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri