EGU22-11247, updated on 28 Mar 2022
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Size distribution of emitted dust in Morocco

Cristina González-Flórez1, Martina Klose2, Andrés Alastuey3, Sylvain Dupont4, Vic Etyemezian5, Adolfo González-Romero1,3, Konrad Kandler6, George Nikolich5, Marco Pandolfi3, Agnesh Panta6, Xavier Querol3, Cristina Reche3, Jesús Yus-Díez3,7, and Carlos Pérez García-Pando1,8
Cristina González-Flórez et al.
  • 1Barcelona Supercomputing Center (BSC), Barcelona, Spain
  • 2Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK-TRO)
  • 3Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain
  • 4INRAE, Bordeaux Sciences Agro, ISPA, F-33140 Villenave d’Ornon, France
  • 5Desert Research Institute, Las Vegas, NV, USA
  • 6Technical University of Darmstadt (TUDa), Darmstadt, Germany
  • 7Universitat de Barcelona (UB), Departament de Física Aplicada, Grup de Meteorologia, C/Martí i Franquès, 1,08028, Barcelona, Spain
  • 8Catalan Institution for Research and Advanced Studies (ICREA), Barcelona, Spain

Atmospheric mineral dust constitutes one of the most important aerosols in terms of mass in the global atmosphere. Dust impacts on the Earth’s climate are closely related to its physical and chemical properties, i.e. its particle size distribution (PSD), mineralogical composition, particle shape, and mixing state. Despite the knowledge acquired on dust properties over the last decades, understanding of dust particle size and composition at emission is still incomplete, partly due to the scarcity of coincident PSD measurements for emitted dust and the parent soil. In this context, the ERC project FRAGMENT (FRontiers in dust minerAloGical coMposition and its Effects upoN climaTe) conducts dust field campaigns in different regions of the world, obtaining a detailed characterization of the soil, airborne particles and meteorology. The first measurement campaign took place in September 2019 at “El Bour”, a dry lake located in the Draa River Basin at the edge of the Sahara desert in Morocco.

Here, we provide an overview of the atmospheric conditions, the dynamical parameters characterizing the structure of the near-surface boundary layer and the wind erosion events of varying intensity that occurred during the measurement period. We explore the temporal variability of: (1) the size-resolved dust concentrations measured by two optical particle counters placed at 1.8 and 3.5 m height, (2) the associated diffusive dust flux calculated through the gradient method, (3) the measured saltation flux and (4) the sandblasting efficiency. We also evaluate the relationships of these variables with friction velocity and atmospheric stability. Finally, we analyse the PSDs of emitted dust concentrations and diffusive flux, and investigate their variability under different meteorological conditions.

How to cite: González-Flórez, C., Klose, M., Alastuey, A., Dupont, S., Etyemezian, V., González-Romero, A., Kandler, K., Nikolich, G., Pandolfi, M., Panta, A., Querol, X., Reche, C., Yus-Díez, J., and Pérez García-Pando, C.: Size distribution of emitted dust in Morocco, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-11247,, 2022.


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