Author(s)

Vidmantas Ulevicius, Arvydas Juozaitis and Saulius Trakumas

Abstract

On the Measurement of Water Content in Secondary Aerosols A contribution to subproject AEROSOL Vidmantas Ulevicius, Arvydas Juozaitis and Saulius Trakumas Lithuanian Institute of Physics, Environmental Physics and Chemistry Laboratory, LT-2600, Vilnius, Lithuania Introduction Water can be the dominant aerosol component at high relative humidities. However, water content cannot be measured by traditional filter sampling methods. The amount of water can be estimated only with in-situ instrumentation, such as Tandem Differential Mobility Analyser (TDMA). TDMA systems have been used to measure the response of fine atmospheric aerosol particles to the relative humidity. It was found that ambient aerosol often splits into relatively non-hygroscopic and hygroscopic fractions at relative humidities above 75 %. However, the regularities between atmospheric aerosol particle composition and its

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