A Finnish Meteorological Institute-Aerosol Cloud Interaction Tube (FMI-ACIT) : Experimental setup and tests of proper operation

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http://hdl.handle.net/10138/307565

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Doulgeris , K M , Brus , D , Raatikainen , T & Kerminen , V-M 2018 , ' A Finnish Meteorological Institute-Aerosol Cloud Interaction Tube (FMI-ACIT) : Experimental setup and tests of proper operation ' , Journal of Chemical Physics , vol. 149 , no. 12 , 124201 . https://doi.org/10.1063/1.5037298

Title: A Finnish Meteorological Institute-Aerosol Cloud Interaction Tube (FMI-ACIT) : Experimental setup and tests of proper operation
Author: Doulgeris, Konstantinos M.; Brus, David; Raatikainen, Tomi; Kerminen, Veli-Matti
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018-09-28
Language: eng
Number of pages: 9
Belongs to series: Journal of Chemical Physics
ISSN: 0021-9606
URI: http://hdl.handle.net/10138/307565
Abstract: The Finnish Meteorological Institute-Aerosol Cloud Interaction Tube (FMI-ACIT) is a multi-purpose instrument for investigating atmospherically relevant interactions between aerosol particles and water vapor under defined laboratory conditions. This work introduces an experimental setup of FMI-ACIT for investigation of the aerosol activation and the droplet growth under supersaturated conditions. Several simulations and experimental tests were conducted to find out what the proper operational parameters are. To verify the ability of FMI-ACIT to perform as a cloud condensation nuclei (CCN) counter, activation experiments were executed using size selected ammonium sulfate [(NH4)(2)SO4] particles in the size range of 10-300 nm. Supersaturations from 0.18% to 1.25% were tested by experiments with different temperature gradients. Those showed that FMI-ACIT can effectively measure CCN in this range. Measured droplet size distributions at supersaturations 0.18% and 1.25% are in good agreement with those determined by a droplet growth model. Published by AIP Publishing.
Subject: SINGLE-PARAMETER REPRESENTATION
CONDENSATION NUCLEUS ACTIVITY
HOMOGENEOUS NUCLEATION
HYGROSCOPIC GROWTH
CCN ACTIVATION
SULFURIC-ACID
PARTICLES
COUNTER
VAPOR
SUPERSATURATION
114 Physical sciences
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