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A new global C-band vegetation optical depth product from ASCAT: Description, evaluation, and inter-comparison

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorLIU, Xiangzhuo
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorJ.-P., Wigneron
hal.structure.identifierVienna University of Technology = Technische Universität Wien [TU Wien]
dc.contributor.authorWAGNER, Wolfgang
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorFRAPPART, Frédéric
hal.structure.identifierSouthwest University [Chongqing]
dc.contributor.authorFAN, Lei
hal.structure.identifierVienna University of Technology = Technische Universität Wien [TU Wien]
dc.contributor.authorVREUGDENHIL, Mariette
hal.structure.identifierTerritoires, Environnement, Télédétection et Information Spatiale [UMR TETIS]
dc.contributor.authorBAGHDADI, Nicolas
hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
dc.contributor.authorZRIBI, Mehrez
hal.structure.identifierUniversity of Augsburg [UNIA]
dc.contributor.authorJAGDHUBER, Thomas
hal.structure.identifierPeking University [Beijing]
dc.contributor.authorTAO, Shengli
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorLI, Xiaojun
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorWANG, Huan
hal.structure.identifierZhengzhou University
dc.contributor.authorWANG, Mengjia
hal.structure.identifierNanjing University of Information Science and Technology [NUIST]
dc.contributor.authorBAI, Xiaojing
hal.structure.identifierAl-Azhar University [Cairo, Egypt]
dc.contributor.authorMOUSA, B.G.
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
dc.contributor.authorCIAIS, Philippe
dc.date.accessioned2024-04-08T11:41:59Z
dc.date.available2024-04-08T11:41:59Z
dc.date.issued2023-12
dc.identifier.issn0034-4257
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195065
dc.description.abstractEnActive microwave measurements have the potential to estimate vegetation optical depth (VOD), an indicator related to vegetation water content and biomass. The Advanced SCATterometer (ASCAT) provides long-term C-band backscatter data at vertical-vertical (VV) polarization from 2007. So far, very few studies have considered retrieving VOD from this active sensor. This study presents a new publicly released global long-term and continuous (2007–2020) C-band VOD dataset retrieved from the ASCAT observations, named the ASCAT INRAE-BORDEAUX or ASCAT IB VOD product. The retrieval algorithm is based on the Water Cloud Model (WCM) including the Ulaby bare soil model. The algorithm takes advantage of a multi-temporal (MT) retrieval method relying on a cost function where constraints to the retrieved parameters are implemented and a reanalysis soil moisture (SM) dataset from ERA5-Land is used as an input. The performance of ASCAT IB VOD was evaluated by inter-comparing it with ASCAT Technische Universität Wien (TUW), the Advanced Microwave Scanning Radiometer 2 (AMSR2), and VOD Climate Archive (VODCA) VOD products (the last two products are estimated from passive microwave observations). Results showed that ASCAT IB VOD presented the highest spatial correlation with aboveground biomass (R ∼ 0.83) and with the Global Ecosystem Dynamics Investigation (GEDI) canopy height (R ∼ 0.84–0.85). In terms of temporal performance, ASCAT IB VOD had the highest correlation R values with leaf area index (LAI) and Normalized Difference Water Index (NDWI) in most parts of the globe from 2013 to 2018. This contrasts with AMSR2 VODs which correlated better with Normalized Difference Vegetation Index (NDVI). The new ASCAT-based VOD product on a global scale highlighted the potential benefit of combining active (namely ASCAT) and passive (namely AMSR2) VOD products for vegetation studies.
dc.language.isoen
dc.publisherElsevier
dc.subject.enVOD
dc.subject.enBiomass
dc.subject.enVegetation phenology
dc.subject.enASCAT
dc.subject.enActive microwave
dc.subject.enMulti-temporal (MT)
dc.subject.enAMSR2
dc.title.enA new global C-band vegetation optical depth product from ASCAT: Description, evaluation, and inter-comparison
dc.typeArticle de revue
dc.identifier.doi10.1016/j.rse.2023.113850
dc.subject.halPlanète et Univers [physics]/Océan, Atmosphère
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnement
bordeaux.page113850
bordeaux.volume299
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-04246194
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04246194v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2023-12&rft.volume=299&rft.spage=113850&rft.epage=113850&rft.eissn=0034-4257&rft.issn=0034-4257&rft.au=LIU,%20Xiangzhuo&J.-P.,%20Wigneron&WAGNER,%20Wolfgang&FRAPPART,%20Fr%C3%A9d%C3%A9ric&FAN,%20Lei&rft.genre=article


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