EGU2020-3723, updated on 18 Nov 2020
https://doi.org/10.5194/egusphere-egu2020-3723
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Dust and biomass burning aerosol transport in South Atlantic during AEROCLO-sA

Jean-Pierre Chaboureau1, Laurent Labbouz1, Cyrille Flamant2, and Alma Hodzic3
Jean-Pierre Chaboureau et al.
  • 1University of Toulouse/CNRS, Laboratoire dAerologie, Toulouse, France (jean-pierre.chaboureau@aero.obs-mip.fr)
  • 2Laboratoire Atmosphère Milieux Observations Spatiales (LATMOS)/IPSL, UMR CNRS 8190, Sorbonne Université, UVSQ, Paris, France
  • 3National Center for Atmospheric Research, Boulder, CO, USA

We investigate the transport of dust and biomass burning aerosols in South Atlantic during the Aerosols, Radiation and Clouds in southern Africa (AEROCLO-sA) campaign in September 2017. A regional Meso-NH simulation has been run using a 12-km horizontal grid-spacing without deep convection parameterization, an on-line dust emission scheme, a passive tracer of biomass burning aerosol (BBA) emitted using the daily Global Fire Emissions Database and online-computed backward trajectories. The simulation captures both the aerosol optical depth and the vertical distribution of aerosols as observed from airborne and spaceborne lidars. It also reproduces the occurrence of deep convection over Congo and stratocumulus over South Atlantic well. A Lagrangian analysis reveals the origin of aerosols in the South Atlantic. Dust aerosols found just above the stratocumulus were emitted from the coasts and the Ethosha Pan a few days earlier. The BBAs located between 1 and 5 km come mainly from Angola in about 3.5 days. The 8-12 km layer is fed by up to 12 % of the air masses that experienced convection over the Congo Basin in the last 5 days. This amount is much reduced in the sensitivity simulation with a deep convection parameterization.

How to cite: Chaboureau, J.-P., Labbouz, L., Flamant, C., and Hodzic, A.: Dust and biomass burning aerosol transport in South Atlantic during AEROCLO-sA, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-3723, https://doi.org/10.5194/egusphere-egu2020-3723, 2020

This abstract will not be presented.