Investigating the role of deposition on the size distribution of near-surface dust flux during erosion events
| hal.structure.identifier | Interactions Sol Plante Atmosphère [UMR ISPA] | |
| dc.contributor.author | FERNANDES, Royston | |
| hal.structure.identifier | Interactions Sol Plante Atmosphère [UMR ISPA] | |
| dc.contributor.author | DUPONT, Sylvain | |
| hal.structure.identifier | Interactions Sol Plante Atmosphère [UMR ISPA] | |
| dc.contributor.author | LAMAUD, Eric | |
| dc.date.accessioned | 2024-04-08T11:50:04Z | |
| dc.date.available | 2024-04-08T11:50:04Z | |
| dc.date.issued | 2019-04 | |
| dc.identifier.issn | 1875-9637 | |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/195368 | |
| dc.description.abstractEn | Predicting 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.sponsorship | Erosion éolienne en présence de végétation éparse - ANR-15-CE02-0013 | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc/ | |
| dc.subject.en | Dust near-surface flux | |
| dc.subject.en | Dust deposition | |
| dc.subject.en | Deposition velocity | |
| dc.subject.en | Fetch | |
| dc.subject.en | Dust transport | |
| dc.subject.en | Dust emission flux | |
| dc.subject.en | Dust emission | |
| dc.subject.en | Dust flux Size distribution | |
| dc.title.en | Investigating the role of deposition on the size distribution of near-surface dust flux during erosion events | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.aeolia.2019.02.002 | |
| dc.subject.hal | Physique [physics] | |
| dc.subject.hal | Sciences de l'environnement | |
| dc.subject.hal | Planète et Univers [physics] | |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre | |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre/Géophysique [physics.geo-ph] | |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre/Géomorphologie | |
| bordeaux.journal | Aeolian Research | |
| bordeaux.page | 32-43 | |
| bordeaux.volume | 37 | |
| bordeaux.hal.laboratories | Interactions Soil Plant Atmosphere (ISPA) - UMR 1391 | * |
| bordeaux.institution | Bordeaux Sciences Agro | |
| bordeaux.institution | INRAE | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-02055226 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-02055226v1 | |
| bordeaux.COinS | ctx_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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