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Investigating the role of deposition on the size distribution of near-surface dust flux during erosion events

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorFERNANDES, Royston
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDUPONT, Sylvain
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorLAMAUD, Eric
dc.date.accessioned2024-04-08T11:50:04Z
dc.date.available2024-04-08T11:50:04Z
dc.date.issued2019-04
dc.identifier.issn1875-9637
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195368
dc.description.abstractEnPredicting the particle size distribution (PSD) of near-surface turbulent dust flux ( F wc ) is a key issue for estimating the size of atmospheric mineral dust. Existing dust emission schemes differ in their parametrization of the emitted dust ( F emi ) PSD, defining differently the surface inter-particle cohesive force and the influence of wind intensity. Moreover, these schemes have often been validated-fitted against field measurements, assuming PSD similarity between F wc and F emi . Here, we investigate numerically the main factors influencing F wc -PSD during erosion events. To this effect, we developed a 1D dust-dispersal model. After evaluating the model against published results, it is shown that F wc -PSD is influenced by both deposition and F emi -PSD. This latter one is shaped by the inter-particle cohesive bond exponent and the surface dust PSD. A time-to-space conversion of the dust flux variations reveals an increasing enrichment of F wc in small particles compared to F emi . This enrichment remains lower than a few percent of the total dust flux (in number) for fetch lower than 100 m, but it can rise to more than 10% for fetch longer than 1 km. This fetch dependence of F wc -PSD is explained by the slow deposition of particles having the lowest deposition velocities. Importantly, this difference between F wc and F emi PSDs is accentuated with wind intensity, with F emi -PSD dominated by particles with large deposition velocities, and in presence of a large-scale background dust concentration. The role played by the deposition process in shapingthe F wc -PSD should be considered when evaluating dust emission schemes against near-surface field measurements.
dc.description.sponsorshipErosion éolienne en présence de végétation éparse - ANR-15-CE02-0013
dc.language.isoen
dc.publisherElsevier
dc.rights.urihttp://creativecommons.org/licenses/by-nc/
dc.subject.enDust near-surface flux
dc.subject.enDust deposition
dc.subject.enDeposition velocity
dc.subject.enFetch
dc.subject.enDust transport
dc.subject.enDust emission flux
dc.subject.enDust emission
dc.subject.enDust flux Size distribution
dc.title.enInvestigating the role of deposition on the size distribution of near-surface dust flux during erosion events
dc.typeArticle de revue
dc.identifier.doi10.1016/j.aeolia.2019.02.002
dc.subject.halPhysique [physics]
dc.subject.halSciences de l'environnement
dc.subject.halPlanète et Univers [physics]
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géophysique [physics.geo-ph]
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géomorphologie
bordeaux.journalAeolian Research
bordeaux.page32-43
bordeaux.volume37
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02055226
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02055226v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Aeolian%20Research&rft.date=2019-04&rft.volume=37&rft.spage=32-43&rft.epage=32-43&rft.eissn=1875-9637&rft.issn=1875-9637&rft.au=FERNANDES,%20Royston&DUPONT,%20Sylvain&LAMAUD,%20Eric&rft.genre=article


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