Promotie

Interaction between aerosols and convective boundary-layer dynamics over land

Promovendus mr. E (Eduardo) Wilde Barbaro
Promotor prof.dr. MC (Maarten) Krol
prof.dr. AAM (Bert) Holtslag
Copromotor dr. J. Vilà-Guerau de Arellano
Organisatie Wageningen University, Leerstoelgroep Meteorologie en luchtkwaliteit
Datum

vr 20 maart 2015 16:00 tot 17:30

Locatie Aula, gebouwnummer 362
Generaal Foulkesweg 1
362
6703 BG Wageningen
0317-483592

Summary

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.

Propositions

  1. Aerosols alter the development of the convective boundary layer. (this thesis)
  2. 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)
  3. The concept of equality is ill defined, except in arithmetic.
  4. General practice in the Netherlands follows the definition of medicine proposed by Voltaire, consisting of amusing the patient while nature cures the disease, and therefore does not explain the Dutch high lifetime expectancy.
  5. Brazil is the seventh largest economy in the world, but remains stereotyped as a real-life republic of Anchuria.
  6. Grit is the most important quality in pursuing a PhD degree.
  7. Self-reflection fades with age.