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Scaling of dust flux with friction velocity: time resolution effects

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDUPONT, Sylvain
dc.date.accessioned2024-04-08T12:05:26Z
dc.date.available2024-04-08T12:05:26Z
dc.date.issued2020
dc.identifier.issn2169-897X
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196356
dc.description.abstractEnThe intermittency of aeolian soil erosion has motivated studies to extend to small time resolution (less than 15–30 min) the scaling property of erosion fluxes with the friction velocity urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0001. However, common methods used to estimate urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0002 such as the law of the wall or the eddy covariance are only valid for stationary conditions, that is, long periods of 15–30 min. Unlike these methods, the wavelet transform method is applicable for nonstationary conditions. Here, this method is used to investigate the scaling property of the dust flux urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0003 with urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0004 at 1‐min and 10‐s resolutions, during erosion events. At 15‐min resolution, urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0005 and urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0006 estimated from the wavelet transform are identical to those obtained by eddy covariance. At smaller resolution, urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0007 and urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0008 exhibit strong fluctuations around their 15‐min trend, reflecting the nonstationarity of the flow and the intermittency of dust emission, respectively. While the 15‐min resolution urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0009 appears as correlated with urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0010 as with the mean wind speed urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0011, with decreasing resolution, urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0012 becomes less correlated with urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0013 but still significantly correlated with urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0014. Our results suggest that urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0015 is a suitable scaling parameter of urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0016 over usual 15‐ to 30‐min periods with the advantage of being height independent compared to urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0017. However, at small time resolution, urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0018 becomes more relevant to scale urn:x-wiley:jgrd:media:jgrd55952:jgrd55952-math-0019, the surface friction velocity becoming hardly accessible due to the absence of a constant momentum flux layer. Our study demonstrates the suitability of the wavelet transform to estimate dust fluxes at small time resolution or during nonstationary events.
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.title.enScaling of dust flux with friction velocity: time resolution effects
dc.typeArticle de revue
dc.identifier.doi10.1029/2019JD031192
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
bordeaux.journalJournal of Geophysical Research: Atmospheres
bordeaux.page1-16
bordeaux.volume125
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue1
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02622689
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02622689v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Geophysical%20Research:%20Atmospheres&rft.date=2020&rft.volume=125&rft.issue=1&rft.spage=1-16&rft.epage=1-16&rft.eissn=2169-897X&rft.issn=2169-897X&rft.au=DUPONT,%20Sylvain&rft.genre=article


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