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Fluctuations and growth histories of cloud droplets: super-particle simulations of the collision-coalescence process
Stockholm University, Faculty of Science, Department of Meteorology . Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0002-5722-0018
Stockholm University, Faculty of Science, Department of Meteorology .
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
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Abstract [en]

Direct numerical simulations of collisional aggregation in turbulent aerosols are computationally demanding. Many authors therefore use an approximate model of the collision-coalescence process that is computationally more efficient: it relies on representing physical particles in terms of ‘superparticles’. One monitors collisions between superparticles and accounts for collisions between physical particles using a Monte-Carlo algorithm. It has been shown that this algorithm can faithfully represent mean particle growth in turbulent aerosols. Here we investigate how fluctuations are represented in this algorithm. We study particles of different sizes settling under gravity, assuming that the effect of turbulence is simply to mix the particles horizontally. We compute the statistics of growth histories and analyze their fluctuations in terms of the ‘lucky-droplet’ model. We discuss under which circumstances artefacts change the fluctuations of the growth histories, how these can be avoided, and which questions remain to be answered when turbulent fluctuations are explicitly incorporated.

National Category
Climate Research
Research subject
Atmospheric Sciences and Oceanography
Identifiers
URN: urn:nbn:se:su:diva-158540OAI: oai:DiVA.org:su-158540DiVA, id: diva2:1237427
Funder
The Research Council of Norway, FRINATEK grant 231444Knut and Alice Wallenberg Foundation, Dnr. KAW 2014.0048Swedish Research Council, 2012-5797, 2013-03992, and 2017-03865Available from: 2018-08-08 Created: 2018-08-08 Last updated: 2018-08-14Bibliographically approved
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Li, Xiang-YuSvensson, GunillaBrandenburg, Axel
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