Observation of the suppression of water uptake by marine particles


Autoria(s): Modini, Robin L.; Johnson, Graham R.; He, Congrong; Ristovski, Zoran
Data(s)

2010

Resumo

A 4 week intensive measurement campaign was conducted in March–April 2007 at Agnes Water, a remote coastal site on the east coast of Australia. A Volatility-Hygroscopicity-Tandem Differential Mobility Analyser (VH-TDMA) was used to investigate changes in the hygroscopic properties of ambient particles as volatile components were progressively evaporated. Nine out of 18 VH-TDMA volatility scans detected internally mixed multi-component particles in the nucleation and Aitken modes in clean marine air. Evaporation of a volatile, organic-like component in the VH-TDMA caused significant increases in particle hygroscopicity. In 3 scans the increase in hygroscopicity was so large it was explained by an increase in the absolute volume of water uptake by the particle residuals, and not merely an increase in their relative hygroscopicity. This indicates the presence of organic components that were suppressing the hygroscopic growth of mixed particles on the timescale of humidification in the VH-TDMA (6.5 secs). This observation was supported by ZSR calculations for one scan, which showed that the measured growth factors of mixed particles were up to 18% below those predicted assuming independent water uptake of the individual particle components. The observed suppression of water uptake could be due to a reduced rate of hygroscopic growth caused by the presence of organic films or organic-inorganic interactions in solution droplets that had a negative effect on hygroscopicity.

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/38670/

Publicador

Elsevier

Relação

http://eprints.qut.edu.au/38670/1/38670.pdf

DOI:10.1016/j.atmosres.2010.03.025

Modini, Robin L., Johnson, Graham R., He, Congrong, & Ristovski, Zoran (2010) Observation of the suppression of water uptake by marine particles. Atmospheric Research, 98(2-4), pp. 219-228.

Direitos

Copyright 2010 Elsevier

Fonte

Faculty of Science and Technology; Institute of Health and Biomedical Innovation; Physics

Palavras-Chave #040101 Atmospheric Aerosols #040199 Atmospheric Sciences not elsewhere classified
Tipo

Journal Article