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Diurnal and Seasonal Variations of Passive and Active Microwave Satellite Observations Over Tropical Forests

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.authorJIMENEZ, Carlos
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.authorDINH, Lan Anh
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierLaboratoire d'études en Géophysique et océanographie spatiales [LEGOS]
dc.contributor.authorFRAPPART, Frédéric
hal.structure.identifierDepartment of Earth and Environmental Engineering [New York]
dc.contributor.authorGENTINE, Pierre
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorJ.-P., Wigneron
dc.contributor.authorMUNCHAK, Joseph
dc.date.accessioned2024-04-08T11:46:38Z
dc.date.available2024-04-08T11:46:38Z
dc.date.issued2022-02
dc.identifier.issn2169-8953
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195241
dc.description.abstractEnDocumenting the large scale variability of tropical forest structure and function is needed for improved understanding of the carbon and water cycles. The seasonal and diurnal cycles of passive and active microwave satellite observations are jointly analyzed for the first time, using the Global Precipitation Mission (GPM). Collocated backscattering coefficients from the GPM Dual-frequency Precipitation Radar (DPR) and emissivities derived from the GPM Microwave Imager (GMI) are studied for 4 yr over the Tropics, at the available multiple frequencies, angles, and polarizations. Our analysis confirms the diurnal patterns already observed with radars, with a maximum backscatter in the early morning attributed to the water xylem refill at night. At the same time, early in the morning, we evidence a minimum emissivity over most of tropical forests: the backscatter and emissivity diurnal cycles tend to be in phase opposition, as well as their seasonal cycles. However, during the dry season in the south eastern Amazonian forest where precipitation can be low for several months, the emissivity diurnal cycle changes, implying a different behavior of the forest in this area, related to the state of the canopy.
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.rights.urihttp://hal.archives-ouvertes.fr/licences/copyright/
dc.subject.entropical forest
dc.subject.enremote sensing
dc.subject.enbackscattering
dc.subject.enemissivity
dc.title.enDiurnal and Seasonal Variations of Passive and Active Microwave Satellite Observations Over Tropical Forests
dc.typeArticle de revue
dc.identifier.doi10.1029/2021JG006677
dc.subject.halSciences de l'environnement
bordeaux.journalJournal of Geophysical Research: Biogeosciences
bordeaux.volume127
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue2
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-03615921
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03615921v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Geophysical%20Research:%20Biogeosciences&rft.date=2022-02&rft.volume=127&rft.issue=2&rft.eissn=2169-8953&rft.issn=2169-8953&rft.au=PRIGENT,%20Catherine&JIMENEZ,%20Carlos&DINH,%20Lan%20Anh&FRAPPART,%20Fr%C3%A9d%C3%A9ric&GENTINE,%20Pierre&rft.genre=article


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