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In this paper a LES model with Lagrangian representation of microphysics isused to simulate stratucumulus clouds in idealized 2D set-up based on theVOCALS observations. The general features of the cloud simulated by the model,such as cloud water mixing ratio and cloud droplet number profile agree wellwith the observations. The model can capture observed relation between aerosoldistribution and concentration measured below the cloud and cloud dropletnumber. Averaged over the whole cloud droplet spectrum from the numerical modeland observed droplet spectrum are similar, with the observations showing ahigher concentration of droplets bigger than 25 {\mu}m. Much bigger differencesare present when comparing modelled and observed droplet spectrum on specificmodel level.  Despite the fact that microphysics is formulated in a Lagrangian frameworkthe standard deviation of the cloud droplet distribution is larger than 1{\mu}m. There is no significant narrowing of the cloud droplet distribution inthe up-drafts, but the distribution in the up-drafts is narrower than in thedown-drafts. Modelled and observed standard deviation profiles agree well withobservations for moderate/high cloud droplet numbers, with much narrower thanobserved droplet spectrum for low droplet number.  Model results show that a significant percentage of droplets containingaerosol bigger than 0.3 {\mu}m didn't reach activation radius, yet exceeding 1{\mu}m, what is typically measured as a cloud droplets. Also, the relationshipbetween aerosol sizes and cloud droplet sizes is complex; there is a broadrange of possible cloud droplet sizes for a given aerosol size.

Stratocumulus over SouthEast Pacific: Idealized 2D simulations with the Lagrangian Cloud Model