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

Show full item record



Permalink

http://hdl.handle.net/10138/165562

Citation

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 . DOI: 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: University of Helsinki, Department of Astronomy (-2009)
University of Helsinki, Micrometeorology and biogeochemical cycles
University of Helsinki, Institute for Atmospheric and Earth System Research
Date: 2016
Language: eng
Number of pages: 10
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
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.
Subject: TRADE-WIND CUMULI
SUPERSATURATION
FLUCTUATIONS
NUCLEATION
INTERMITTENCY
MICROPHYSICS
ACTIVATION
114 Physical sciences
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
acp_16_7889_2016.pdf 862.1Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record