A key process that modifies the mass flux and the variables of the cloud updraught model
is the mixing between clouds and their environment by the so-called entrainment and detrainment processes that describe respectively
the inflow of environmental air into the cloud and the outflow of cloudy air into the environment.
The precise nature of these mixing processes is still an active field of research and its parameterization is still in its infancy.
In accordance with its importance, numerous papers on entrainment and detrainment appeared over the last
65 years. In this chapter the developments are described that we believe are important. In view of the large extend of the field we do not claim to give a complete overview of
all notable studies.
WC de Rooy, JI Yano, P Bechtold, SJ Boing. Concepts of Parameterization for Atmospheric Convection; Chapter