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Intratidal and Fortnightly Variability of Vertical Mixing in a Macrotidal Estuary: The Gironde

dc.rights.licenseopenen_US
dc.contributor.authorROSS, Lauren
dc.contributor.authorHUGUENARD, Kimberly
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSOTTOLICHIO, Aldo
IDREF: 158099699
dc.date.accessioned2024-06-06T10:44:48Z
dc.date.available2024-06-06T10:44:48Z
dc.date.issued2019-04-01
dc.identifier.issn2169-9275en_US
dc.identifier.urioai:crossref.org:10.1029/2018jc014456
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200307
dc.description.abstractEnIntratidal and fortnightly variability of turbulence at the mouth of a macrotidal estuary is explored in this study. Profiles of turbulent kinetic energy dissipation were estimated from a Vertical Microstructure Profiler, and velocity shear measurements and current velocities were collected with a vessel-mounted Acoustic Doppler Current Profiler. Gradient Richardson numbers were quantified using density measurements from a Conductivity, Temperature, Depth profiler and squared vertical shear quantified from current velocities. All measurements were collected over one complete semidiurnal tidal cycle in both neap and spring tide conditions. Vertical eddy viscosity (Az) was quantified from the available data and was used as a proxy for vertical mixing. Results showed intratidal asymmetries in bottom-generated turbulence during neap with Az larger during ebb tide (∼10−2 m2/s) than flood tide (∼10−3 m2/s) with the opposite occurring during spring tide with larger Az during flood (10−1 m2/s) than ebb (10−2 m2/s). Lateral processes produced elevated near-surface mixing decoupled from bottom-generated turbulence at the end of flood and ebb tide during neap and spring. The secondary flows were driven by Coriolis, and these flows either enhanced (neap tide, end of flood) or maintained (spring tide, end of ebb) total shear through slack tides producing near-surface to midwater column turbulence. These results are the first of their kind to show midwater column mixing from lateral circulation driven by Coriolis in a well-mixed system, which vary from the lateral processes previously shown to destabilize water columns in estuaries more influenced by stratification.
dc.language.isoENen_US
dc.sourcecrossref
dc.title.enIntratidal and Fortnightly Variability of Vertical Mixing in a Macrotidal Estuary: The Gironde
dc.title.alternativeJ. geophys. res. Ocean.en_US
dc.typeArticle de revueen_US
dc.identifier.doi10.1029/2018jc014456en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalJournal of Geophysical Research. Oceansen_US
bordeaux.page2641-2659en_US
bordeaux.volume124en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue4en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamMETHYSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04603397
hal.version1
hal.date.transferred2024-06-06T10:44:49Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
workflow.import.sourcedissemin
dc.rights.ccPas de Licence CCen_US
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