Supersaturation in the Wake of a Precipitating Hydrometeor and its
Impact on Aerosol Activation
Abstract
The secondary activation of aerosols impacts the life cycle of a cloud.
A detailed understanding is necessary for reliable climate prediction.
Recent laboratory experiments demonstrate that aerosols can be activated
in the wake of precipitating hydrometeors. However, many quantitative
aspects of this wake-induced activation remain unclear. Here, we report
a detailed numerical investigation of the activation potential of
wake-induced supersaturation. By Lagrangian tracking of aerosols we show
that a significant fraction of aerosols are activated in the
supersaturated wake. These ‘lucky aerosols’ are entrained in the wake’s
vortices and reside in the supersaturated environment sufficiently long
to be activated. Our analyses show that wake-induced activation can
contribute at a level similar to other well known secondary production
processes.