We investigate how aerosols located above the surface, namely the atmospheric boundary layer (ABL), lead to modifications on the solar radiation. Perturbations on the solar radiation arriving at the surface change the surface flux of heat and evaporation, thus feed backing in the atmosphere turbulent circulations. To integrate all these processes, we use a high-spatial (meter-scale) and temporal (second-scale) three-dimensional turbulent model. Our numerical results, well supported by observations, show that aerosols alter the temperature of the ABL, weakening its vertical circulations. This interaction is very sensitive to the reflective capacity of the aerosols and their vertical location within or above the ABL. We also analyze how the turbulent characteristics influence the gas-aerosol conversion throughout the CBL. Key processes, such as the gas-aerosol removal at the surface and turbulent transport of aerosols depend strongly on this conversion. Thus, we propose new representations for the turbulent transport of aerosols to be implemented in chemistry-climate global models.
- Aerosols alter the development of the convective boundary layer. (this thesis)
- Resolving the essential processes related to aerosols and boundary-layer dynamics in a simple coupled system is more advantageous than resolving in detail each process individually. (this thesis)
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