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Calibration of, and measurements with, a volatility hygroscopicity tandem differential mobility analyzer

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Title: Calibration of, and measurements with, a volatility hygroscopicity tandem differential mobility analyzer
Author: Hakala, Jani
Contributor: Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Fysiikan laitos
Thesis level:
Abstract: The most important parameters describing the aerosol particle population are the size,
concentration and composition of the aerosol particles. The size and water content of
the aerosol particles are dependent of the relative humidity of the ambient air.
Hygroscopicity is a measure to describe the water absorption ability of an aerosol
particle. Volatility of an aerosol defines how the aerosol particles behave as a function
of temperature.
A Volatility-Hygroscopicity Tandem Differential Mobility Analyzer (VH-TDMA) is an
instrument for size-selected investigation of particle number concentration, volatility,
hygroscopicity and the hygroscopicity of the particle core, i.e. what is left of the particle
after the volatilization. While knowing these qualities of aerosol particles, one can
predict their behavior in different atmospheric conditions. Volatility and hygroscopicity
can also be used for indirect analysis of chemical composition.
The aim of this study was to build and characterize a VH-TDMA, and report the results
of its field deployment at the California Nexus (CalNex) 2010 measurement campaign.
The calibration measurements validated that with the VH-TDMA one can obtain
accurate volatility and hygroscopicity measurements for particles between 20 nm and
145 nm. The CalNex 2010 results showed that the instrument is capable in field
measurements at varying measurement conditions; and valuable data about
hygroscopicty, volatility and the mixing state of several types of aerosols were
measured. The data obtained was in line with the observations based on the data
measured with other instruments.
Description: Vain tiivistelmä. Opinnäytteiden arkistokappaleet ovat luettavissa Helsingin yliopiston kirjastossa. Hae HELKA-tietokannasta (http://www.helsinki.fi/helka/index.htm).Abstract only. The paper copy of the whole thesis is available for reading room use at the Helsinki University Library. Search HELKA online catalog (http://www.helsinki.fi/helka/index.htm).Endast avhandlingens sammandrag. Pappersexemplaret av hela avhandlingen finns för läsesalsbruk i Helsingfors universitets bibliotek. Sök i HELKA-databasen (http://www.helsinki.fi/helka/index.htm).
URI: http://hdl.handle.net/10138/37580
Date: 2012-11-19
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