A DNS study of aerosol and small-scale cloud turbulence interaction

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Babkovskaia , N , Rannik , U , Phillips , V , Siebert , H , Wehner , B & Boy , M 2016 , ' A DNS study of aerosol and small-scale cloud turbulence interaction ' , Atmospheric Chemistry and Physics , vol. 16 , no. 12 , pp. 7889-7898 . https://doi.org/10.5194/acp-16-7889-2016

Title: A DNS study of aerosol and small-scale cloud turbulence interaction
Author: Babkovskaia, Natalia; Rannik, Ullar; Phillips, Vaughan; Siebert, Holger; Wehner, Birgit; Boy, Michael
Contributor organization: Department of Physics
Micrometeorology and biogeochemical cycles
Date: 2016
Language: eng
Number of pages: 10
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
DOI: https://doi.org/10.5194/acp-16-7889-2016
URI: http://hdl.handle.net/10138/165562
Abstract: The purpose of this study is to investigate the interaction between small-scale turbulence and aerosol and cloud microphysical properties using direct numerical simulations (DNS). We consider the domain located at the height of about 2000aEuro-m from the sea level, experiencing transient high supersaturation due to atmospheric fluctuations of temperature and humidity. To study the effect of total number of particles (N-tot) on air temperature, activation and supersaturation, we vary N-tot. To investigate the effect of aerosol dynamics on small-scale turbulence and vertical air motion, we vary the intensity of turbulent fluctuations and the buoyant force. We find that even a small number of aerosol particles (55.5aEuro-cm(-3)), and therefore a small droplet number concentration, strongly affects the air temperature due to release of latent heat. The system comes to an equilibrium faster and the relative number of activated particles appears to be smaller for larger N-tot. We conclude that aerosol particles strongly affect the air motion. In a case of updraught coursed by buoyant force, the presence of aerosol particles results in acceleration of air motion in vertical direction and increase of turbulent fluctuations.
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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