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\begin{document}

\title{Dynamics of the coastal Stratocumulus cloud dissipation}



\author[1]{Mónica Zamora Zapata}%
\author[2]{Thijs Heus}%
\author[3]{Jan Kleissl}%
\affil[1]{University of California San Diego}%
\affil[2]{Cleveland State University}%
\affil[3]{Univ of California, San Diego}%


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  \date{May 27, 2024}


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\begin{abstract}
Coastal Stratocumulus clouds (Sc) can greatly impact the available solar
radiation in areas like southern California. These clouds usually
dissipate during the morning, as surface fluxes increase in the day. The
dissipation process begins by the thinning of the cloud layer, that then
becomes a broken cloud field until the clouds completely dissipate. A
better understanding of the process could improve predictions of
dissipation time and solar variability for this type of clouds. We
investigate the evolution of a broken cloud field using LES simulations
of coastal Sc clouds over Southern California (Ghonima et al, JAS 2016).
We identify and characterize coherent updrafts, downdrafts, and cloud
elements using flow field variables (vertical velocity and liquid water
mixing ratio). The cloud layer is observed to become a broken cloud
field around hour 8 of the simulation, after which the thinning tendency
strongly diminishes and the variability of cloud fraction, cloud
thickness, and liquid water path suddenly increases. The few cloud
elements remaining at noon are found to be located close to cloud base,
unlike at night, when they are distributed throughout the whole cloud
layer. The largest updrafts and downdrafts contribute to a large portion
of the turbulent fluxes along the day (on average, 40\% of vertical
velocity variance and 48\% of the buoyancy flux), and their relative
contribution changes during the day as updrafts become stronger and
downdrafts weaken around noon.%
\end{abstract}%



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