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Insights into the size-resolved dust emission from field measurements in the Moroccan Sahara

hal.structure.identifierBarcelona Supercomputing Center - Centro Nacional de Supercomputacion [BSC-CNS]
dc.contributor.authorGONZÁLEZ-FLÓREZ, Cristina
hal.structure.identifierKarlsruhe Institute of Technology [KIT]
dc.contributor.authorKLOSE, Martina
hal.structure.identifierInstitute of Environmental Assessment and Water Research [IDAEA]
dc.contributor.authorALASTUEY, Andrés
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDUPONT, Sylvain
hal.structure.identifierBarcelona Supercomputing Center - Centro Nacional de Supercomputacion [BSC-CNS]
dc.contributor.authorESCRIBANO, Jerónimo
hal.structure.identifierDesert Research Institute [DRI]
dc.contributor.authorETYEMEZIAN, Vicken
hal.structure.identifierBarcelona Supercomputing Center - Centro Nacional de Supercomputacion [BSC-CNS]
dc.contributor.authorGONZALEZ-ROMERO, Adolfo
hal.structure.identifierNASA Goddard Institute for Space Studies [GISS]
dc.contributor.authorHUANG, Yue
hal.structure.identifierTechnische Universität Darmstadt - Technical University of Darmstadt [TU Darmstadt]
dc.contributor.authorKANDLER, Konrad
hal.structure.identifierDesert Research Institute [DRI]
dc.contributor.authorNIKOLICH, George
hal.structure.identifierTechnische Universität Darmstadt - Technical University of Darmstadt [TU Darmstadt]
dc.contributor.authorPANTA, Agnesh
hal.structure.identifierInstitute of Environmental Assessment and Water Research [IDAEA]
dc.contributor.authorQUEROL, Xavier
hal.structure.identifierInstitute of Environmental Assessment and Water Research [IDAEA]
dc.contributor.authorRECHE, Cristina
hal.structure.identifierInstitute of Environmental Assessment and Water Research [IDAEA]
dc.contributor.authorYUS-DÍEZ, Jesús
hal.structure.identifierBarcelona Supercomputing Center - Centro Nacional de Supercomputacion [BSC-CNS]
dc.contributor.authorPÉREZ GARCÍA-PANDO, Carlos
dc.date.accessioned2024-04-08T11:42:53Z
dc.date.available2024-04-08T11:42:53Z
dc.date.issued2023
dc.identifier.issn1680-7316
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195086
dc.description.abstractEnThe particle size distribution (PSD) of mineral dust has a strong effect on the impacts of dust on climate. However, our understanding of the emitted dust PSD, including its variability and the fraction of super-coarse dust (diameter >10 µm), remains limited. Here, we provide new insights into the size-resolved dust emission process based on a field campaign performed in the Moroccan Sahara in September 2019 in the context of the FRontiers in dust minerAloGical coMposition and its Effects upoN climaTe (FRAGMENT) project. The obtained dust concentration and diffusive flux PSDs show significant dependencies upon the friction velocity (u*), wind direction and type of event (regular events versus haboob events). For instance, the number fraction of sub-micrometre particles increases with u*, along with a large decrease in the mass fraction of super-coarse dust. We identify dry deposition, which is modulated by u* and fetch length, as a potential cause for this PSD variability. Using a resistance model constrained with field observations to estimate the dry deposition flux and thereby also the emitted dust flux, we show that deposition could represent up to ∼90 % of the emission of super-coarse particles (>10 µm) and up to ∼65 % of the emission of particles as small as ∼5 µm in diameter. Importantly, removing the deposition component significantly reduces the variability with u* in the PSD of the emitted dust flux compared with the diffusive flux, particularly for super-coarse dust. The differences between regular and haboob event concentration and diffusive flux PSDs are suspected to result from a smaller and variable dust source fetch during the haboob events, and/or an increased resistance of soil aggregates to fragmentation associated with the observed increase in relative humidity along the haboob outflow. Finally, compared to the invariant emitted dust flux PSD estimated based on brittle fragmentation theory, we obtain a substantially higher proportion of super-micrometre particles in the dust flux. Overall, our results suggest that dry deposition needs to be adequately considered to estimate the emitted PSD, even in studies limited to the fine and coarse size ranges (<10 µm).
dc.language.isoen
dc.publisherEuropean Geosciences Union
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enInsights into the size-resolved dust emission from field measurements in the Moroccan Sahara
dc.typeArticle de revue
dc.identifier.doi10.5194/acp-23-7177-2023
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnement
bordeaux.journalAtmospheric Chemistry and Physics
bordeaux.page7177-7212
bordeaux.volume23
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue12
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-04158514
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04158514v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Atmospheric%20Chemistry%20and%20Physics&amp;rft.date=2023&amp;rft.volume=23&amp;rft.issue=12&amp;rft.spage=7177-7212&amp;rft.epage=7177-7212&amp;rft.eissn=1680-7316&amp;rft.issn=1680-7316&amp;rft.au=GONZ%C3%81LEZ-FL%C3%93REZ,%20Cristina&amp;KLOSE,%20Martina&amp;ALASTUEY,%20Andr%C3%A9s&amp;DUPONT,%20Sylvain&amp;ESCRIBANO,%20Jer%C3%B3nimo&amp;rft.genre=article


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