OPENAIRE OpenAire Datacite Sygma HAL INRAE Bielefeld Academic Search Engine (BASE) HELDA - Digital Repository of the University of Helsinki Recolector de Ciencia Abierta, RECOLECTA UPCommons. Portal del coneixement obert de la UPC DIGITAL.CSIC Crossref Refubium - Repositorium der Freien Universität Berlin KITopen European Union Open Data Portal https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2023JD040657 https://hal.inrae.fr/hal-04618242/file/JGR%20Atmospheres%20-%202024%20-%20Dupont%20-%20Impact%20of%20Dust%20Source%20Patchiness%20on%20the%20Existence%20of%20a%20Constant%20Dust%20Flux%20Layer%20During.pdf https://doi.org/10.1029/2023jd040657 Journal of Geophysical Research: Atmospheres Open Access 2024-06-11 2024-07-05 2024-06-20 Abstract<p>Dust emission fluxes during wind soil erosion are usually estimated using a dust concentration vertical gradient, by assuming a constant dust flux layer between the surface and the dust measurement levels. Here, we investigate the existence of this layer during erosion events recorded in Iceland and Jordan. Size￢ﾀﾐresolved dust fluxes were estimated at three levels between 2 and 4ￂﾠm using the eddy￢ﾀﾐcovariance method. Dust fluxes were found mainly constant only between the two upper levels in Iceland, the lower dust flux being often stronger and richer in coarse particles, while dust fluxes in Jordan were nearly constant across all levels. The wind dynamics could not explain the absence of a constant dust flux layer in Iceland. We show that the presence of stationary dust source patches in Iceland, related to surface humidity, created a non￢ﾀﾐuniform dust layer near the surface, named dust roughness sublayer (DRSL), where individual plumes behind each patch interact but do not fully mix. The lowest dust measurement level was probably located within this sublayer while the upper ones were located above, such that there the emitted dust became spatially well￢ﾀﾐmixed. This explains near the surface in Iceland, the more intermittent dust concentration, its low correlation with the dust concentrations above, and the richer dust flux in coarse particles due to their lower deposition contribution. Our findings highlight the importance of estimating dust fluxes above a dust blending height whose characteristics depend on the dust source patchiness caused by surface humidity or the presence of sparse non￢ﾀﾐerosive elements.</p [SDE] Environmental Sciences Aeolian erosion events 550 dust flux Soil wind erosion Ensure access to affordable, reliable, sustainable and modern energy for all Dust flux layer 0207 environmental engineering 02 engineering and technology Constant flux layer Àrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida 551 01 natural sciences Make cities and human settlements inclusive, safe, resilient and sustainable Dust flux Simulació per ordinador Atmospheric surface layer size distribution Climate science 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::551 Geologie, Hydrologie, Meteorologie 0105 earth and related environmental sciences info:eu-repo/classification/ddc/550 ddc:550 Size distribution 15. Life on land 520 Physical sciences Earth sciences 13. Climate action [SDE]Environmental Sciences Soil erosion soil wind erosion constant flux layer Dupont, S., Klose, M., Irvine, M. R., González‐Flórez, C., Alastuey, A., Bonnefond, J.‐M., Dagsson‐Waldhauserova, P., Gonzalez‐Romero, A., Hussein, T., Lamaud, E., Meyer, H., Panta, A., Querol, X., Schepanski, K., Vergara Palacio, S., Wieser, A., Yus‐Díez, J., Kandler, K., Pérez García‐Pando, C., 2024-06-11 journalpaper Abstract<p>Dust emission fluxes during wind soil erosion are usually estimated using a dust concentration vertical gradient, by assuming a constant dust flux layer between the surface and the dust measurement levels. Here, we investigate the existence of this layer during erosion events recorded in Iceland and Jordan. Size￢ﾀﾐresolved dust fluxes were estimated at three levels between 2 and 4ￂﾠm using the eddy￢ﾀﾐcovariance method. Dust fluxes were found mainly constant only between the two upper levels in Iceland, the lower dust flux being often stronger and richer in coarse particles, while dust fluxes in Jordan were nearly constant across all levels. The wind dynamics could not explain the absence of a constant dust flux layer in Iceland. We show that the presence of stationary dust source patches in Iceland, related to surface humidity, created a non￢ﾀﾐuniform dust layer near the surface, named dust roughness sublayer (DRSL), where individual plumes behind each patch interact but do not fully mix. The lowest dust measurement level was probably located within this sublayer while the upper ones were located above, such that there the emitted dust became spatially well￢ﾀﾐmixed. This explains near the surface in Iceland, the more intermittent dust concentration, its low correlation with the dust concentrations above, and the richer dust flux in coarse particles due to their lower deposition contribution. Our findings highlight the importance of estimating dust fluxes above a dust blending height whose characteristics depend on the dust source patchiness caused by surface humidity or the presence of sparse non￢ﾀﾐerosive elements.</p Impact of Dust Source Patchiness on the Existence of a Constant Dust Flux Layer During Aeolian Erosion Events 10.1029/2023jd040657 773051