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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 06 Sep 2019

Submitted as: research article | 06 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

The role of aerosol-cloud interactions in linking anthropogenic pollution over southern West Africa and dust emission over the Sahara

Laurent Menut1, Paolo Tuccella2, Cyrille Flamant3, Adrien Deroubaix1,3, and Marco Gaetani3,4 Laurent Menut et al.
  • 1Laboratoire de Météorologie Dynamique, Ecole Polytechnique, IPSL Research University, Ecole Normale Supérieure,Université Paris-Saclay, Sorbonne Universités, CNRS, Route de Saclay, 91128 Palaiseau, France
  • 2CETEMPS, Departement of Physical and Chemical Sciences and Center of Excellence in Telesening of Environment and Model Prediction of Severe Events, University of L’Aquila, Italy
  • 3LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, 75252 Paris, France
  • 4Scuola Universitaria Superiore IUSS, Pavia, Italy

Abstract. The aerosol direct and indirect effects are studied over West Africa in the summer of 2016 using the coupled WRF-CHIMERE regional model including aerosol-cloud interaction parametrization. First, a reference simulation is performed and compared with observations acquired during the Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) field campaign which took place in June and July 2016. Sensitivity experiments are also designed to gain insights into the impact of the aerosols dominating the atmospheric composition in southern West Africa (one simulation with halved anthropogenic emissions and one with halved mineral dust emissions). The most important effect of aerosol-cloud interactions is found for the mineral dust scenario and it is shown that halving the emissions of mineral dust decreases the 2-m temperature by 0.5 K and the boundary layer height by 25 m in monthly average and over the Saharan region. The presence of dust aerosols also increases (resp. decreases) the shortwave (resp. longwave) radiation at the surface by 25 W/m2. It is also shown that the decrease of anthropogenic emissions along the coast has an impact on the mineral dust load over West Africa by increasing their emissions in Saharan region. It is due to a mechanism where particulate matter concentrations are decreased along the coast, imposing a latitudinal shift of the monsoonal precipitation, and, in turn, an increase of the surface wind speed over arid areas, inducing more mineral dust emissions.

Laurent Menut et al.
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Status: open (until 01 Nov 2019)
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Laurent Menut et al.
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