I’m interested in evaluating the radiative impact of aerosol dust on atmospheric dynamics which is an important component of the climate system but is still poorly quantified.
To reach my goals, I use an observations-modelling coupled aproach.
In term of modelling my mean is the regional atmospheric model MesoNH coupled with a dust emission model (the DEAD model) together with the ECWMF analyses. In term of observations, I use the measurements collected during two field campaigns: the BoDEx campaign 2005 and the SOP2a1 2006 of the AMMA project where airborne LIDAR and ground based measurements of meteorological variables were performed. Satellite observations are also investigated in my studies such as CALIPSO , OMI , MODIS and SEVIRI data. For more details, please check the other sections on this website.
Aerosols are known to be small particles of matter suspended in the air. In nature, aerosols are emitted by natural phenomena such as dust storms, volcanoes, wildfires and grassland fires etc.
Now aerosols are also originated from human activities, mainly burning of fossil fuels and industrial emissions. Artificial aerosols represent around 10 per cent of global aerosol emissions, while dust aerosols represent more than 50 per cent.
There is much to study about aerosol impacts on regional and global climate. For now, it is very difficult to analyse the increase or decrease of aerosol emissions. It is also a case study to determine if aerosols are warming or cooling the overall global temperature.
The radiative effect of aerosols tends to cause the cooling of the ground beneath them. Because the radiative effect of aerosols reflects sunlight back into space, the direct cooling effect is the consequence of the reduction of solar radiation reaching the ground.
Aerosols, depending on their composition and density could also have a warming effect as they absorb solar radiation in infrared wave lengths.
Aerosols have an indirect effect too, they constitute the nuclei condensation, crucial for cloud formation. In fact, water vapour needs floating particles in order to condensate and start the formation of water droplets which will form clouds.
Evaluating the radiatif impact of dust on atmospheric thermodynamics on a source region: the Bodélé depression in Chad in the framework of the BodEx campaign 2005
Evaluating the radiatif impact of dust on the West Africain Monsoon dynamics in the framework of the AMMA project.