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Weekly mapping of surface water extent in the intertropical wetlands using spaceborne GNSS reflectometry

hal.structure.identifierLaboratoire d'études en Géophysique et océanographie spatiales [LEGOS]
dc.contributor.authorZEIGER, Pierre
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorFRAPPART, Frédéric
hal.structure.identifierGéosciences Environnement Toulouse [GET]
dc.contributor.authorDARROZES, José
hal.structure.identifierEstellus
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]
dc.contributor.authorPRIGENT, Catherine
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]
dc.contributor.authorJIMÉNEZ, Carlos
hal.structure.identifierGéosciences Environnement Toulouse [GET]
dc.contributor.authorBOURREL, Luc
dc.date.accessioned2024-04-08T11:36:21Z
dc.date.available2024-04-08T11:36:21Z
dc.date.issued2023-11
dc.identifier.issn0022-1694
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195002
dc.description.abstractEnAs of today, the uncertain distribution and dynamics of inundations in the tropical wetlands cause large uncertainties in the quantification of the world’s methane emissions. Long-term, global remote sensing observations currently rely on optical sensors, affected by cloud cover and vegetation, and on passive microwave imagery with a low spatial resolution. Global Navigation Satellite System Reflectometry (GNSS-R) L-band observations from space onboard the Cyclone GNSS (CYGNSS) mission can provide information about the dynamics of surface water at moderate to low spatial resolution and with a frequent revisit. In this article, we propose a methodology to compute the fraction of water contained in 0.1◦ pixels (∼10 km) using CYGNSS reflectivity and Above Ground Biomass (AGB) maps. We produced a 1-year time series of water fractions with a weekly time sampling for the full coverage of CYGNSS between ±38° of latitude, from August 2018 to July 2019. We evaluated the results against regional reference maps of surface water based on MODIS, JERS-1, and PALSAR, and against the Global Inundation Extent from Multi-Satellite (GIEMS) dataset. CYGNSS water fractions represent well the spatial distribution and the seasonality of inundation extent for most of the tropical wetlands, with a global RMSD of 15.0 % against GIEMS. We found a likely overestimation when the soil moisture (SM) exceeds 0.3-0.4 cm3 ∕cm3 , i.e. for saturated soils where GNSS-R reflections are coherent, as the SM was not parameterized in our retrieval model. Despite this, the results are consistent in the entire intertropical band including over densely vegetated areas. These weekly water fractions for 2018-2019 with a 0.1° pixel size are distributed to contribute to further comparisons and hydrological researches.
dc.language.isoen
dc.publisherElsevier
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.enGNSS-reflectometry
dc.subject.enCYGNSS
dc.subject.enInundation dynamics
dc.subject.enSurface water extent
dc.subject.enWater fractions
dc.subject.enWetlands
dc.title.enWeekly mapping of surface water extent in the intertropical wetlands using spaceborne GNSS reflectometry
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jhydrol.2023.130305
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Hydrologie
dc.subject.halInformatique [cs]/Traitement du signal et de l'image
dc.subject.halSciences de l'environnement/Ingénierie de l'environnement
bordeaux.journalJournal of Hydrology
bordeaux.page130305
bordeaux.volume626
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-04491029
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04491029v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Hydrology&rft.date=2023-11&rft.volume=626&rft.spage=130305&rft.epage=130305&rft.eissn=0022-1694&rft.issn=0022-1694&rft.au=ZEIGER,%20Pierre&FRAPPART,%20Fr%C3%A9d%C3%A9ric&DARROZES,%20Jos%C3%A9&PRIGENT,%20Catherine&JIM%C3%89NEZ,%20Carlos&rft.genre=article


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