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Resumen:
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This PhD thesis focuses on the study of the physical processes occurring in the atmospheric boundary layer (ABL) during the transition from a convective, well-mixed diurnal situation, to a nocturnal stable one: the afternoon and evening transition. This is a challenging topic mainly due to the confluence of weak and frequently opposite forcings. Furthermore, the micrometeorological conditions in this time frame may play a crucial role in diverse and relevant events, such as fog onset and growth, the development of frost or health hazards linked to air quality. For these reasons, the interest in this area of research is currently increasing, and field experiments are designed to better understand the afternoon and evening transition processes.
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