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hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
dc.contributor.authorBIRCHER, Simone
hal.structure.identifierLaboratoire de l'intégration, du matériau au système [IMS]
dc.contributor.authorDEMONTOUX, François
hal.structure.identifierLaboratoire de l'intégration, du matériau au système [IMS]
dc.contributor.authorRAZAFINDRATSIMA, Stephen
hal.structure.identifierLaboratoire d'études en Géophysique et océanographie spatiales [LEGOS]
dc.contributor.authorZAKHAROVA, Elena
hal.structure.identifierEuropean Space Research and Technology Centre [ESTEC]
dc.contributor.authorDRUSCH, Matthias
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorWIGNERON, Jean-Pierre
hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
dc.contributor.authorKERR, Yann H.
dc.date.accessioned2024-04-08T12:02:39Z
dc.date.available2024-04-08T12:02:39Z
dc.date.issued2016
dc.identifier.issn2072-4292
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196218
dc.description.abstractEnGlobal surface soil moisture products are derived from passive L-band microwave satellite observations. The applied retrieval algorithms include dielectric models (relating soil water content to relative permittivity) developed for mineral soils. First efforts to generate equivalent models for areas where organic surface layers are present such as in the high-latitude regions have recently been undertaken. The objective of this study was to improve our still insufficient understanding of L-band emission of organic substrates in prospect of enhancing soil moisture estimations in the high latitudes undergoing most rapid climatic changes. To this end, L-band relative permittivity measurements using a resonant cavity were carried out on a wide range of organic surface layer types collected at different sites. This dataset was used to evaluate two already existing models for organic substrates. Some samples from underlying mineral layers were considered for comparison. In agreement with theory the bulk relative permittivity measured in organic substrate was decreased due to an increased bound water fraction (where water molecules are rotationally hindered) compared to the measured mineral material and corresponding output of the dielectric model for mineral soils used in satellite algorithms. No distinct differences in dielectric response were detected in the measurements from various organic layer types, suggesting a generally uniform L-band emission behavior. This made it possible to fit a simple empirical model to the data obtained from all collected organic samples. Outputs of the two existing models both based on only one organic surface layer type were found to lie within the spread of our measured data, and in close proximity to the derived simple model. This general consensus strengthened confidence in the validity of all these models. The simple model should be suitable for satellite soil moisture retrieval applications as it is calibrated on a wide range of organic substrate types and the entire wetness range, and does not require any auxiliary input that may be difficult to obtain globally. This renders it generically applicable wherever organic surface layers are present.
dc.language.isoen
dc.publisherMDPI
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subjectpermittivité diélectrique
dc.subjecthumidité du sol
dc.subjectalgorithme
dc.subjectanalyse de données
dc.subjecttélédétection
dc.subjectdonnée satellite
dc.subjectsubstrat organique
dc.subject.enSMOS
dc.subject.enpassive microwave remote sensing
dc.subject.enL-band
dc.subject.ensoil moisture
dc.subject.enorganic soil
dc.subject.enrelative permittivity
dc.subject.enpermittivity
dc.subject.enmulti-objective particle swarm optimization (mopso)
dc.subject.endata analysis
dc.subject.enremote sensing
dc.title.enL-Band relative permittivity of organic soil surface layers—A new dataset of resonant cavity measurements and model evaluation
dc.typeArticle de revue
dc.identifier.doi10.3390/rs8121024
dc.subject.halSciences de l'environnement/Milieux et Changements globaux
dc.subject.halSciences de l'ingénieur [physics]/Traitement du signal et de l'image
bordeaux.journalRemote Sensing
bordeaux.page1-17
bordeaux.volume8
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue12
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-01602344
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01602344v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Remote%20Sensing&rft.date=2016&rft.volume=8&rft.issue=12&rft.spage=1-17&rft.epage=1-17&rft.eissn=2072-4292&rft.issn=2072-4292&rft.au=BIRCHER,%20Simone&DEMONTOUX,%20Fran%C3%A7ois&RAZAFINDRATSIMA,%20Stephen&ZAKHAROVA,%20Elena&DRUSCH,%20Matthias&rft.genre=article


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