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\begin{document}
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\title{Distinct Mixing Regimes in Shallow Cumulus Clouds}



\author[1]{Yael Arieli}%
\author[2]{Eshkol Eytan}%
\author[3]{Orit Altaratz}%
\author[4]{Alexander Khain}%
\author[1]{Ilan Koren}%
\affil[1]{Weizmann Institute of Science}%
\affil[2]{University of Colorado Boulder}%
\affil[3]{Weizmann Inst.}%
\affil[4]{Hebrew University in Jerusalem}%


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  \date{May 07, 2026}


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\begin{abstract}
Understanding the nature of mixing between cloudy air and its
surroundings is an important and yet, open question.

In this research, we use high-resolution (10m) bin-microphysics LES of a
cumulus cloud, together with a Lagrangian passive tracer tracking
method, to study mixing. We analyze the passive tracers as a function of
their trajectories and the thermodynamic conditions they undergo inside
and outside the cloud. Three main mixing regimes (core, periphery, and
skin) are identified, each determining a subset of tracers with similar
trajectories.

These mixing regimes can be observed throughout the cloud's lifetime and
they provide evidence for the presence of an undiluted core in shallow
cumulus clouds. At the dissipation stage, a fourth regime is identified:
cloud-top entrainment followed by downdrafts.%
\end{abstract}%



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