The connection between hygroscopic and optical particle properties in the atmospheric aerosol

Details The connection between hygroscopic and optical particle properties in the atmospheric aerosol The connection between hygroscopic and optical particle properties in the atmospheric aerosol

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3649h&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 19, p. 3649-3652

Physics

3

Atmospheric Composition And Structure: Aerosols And Particles

Scientific paper

With the combination of a hygroscopicity tandem differential mobility analyzer (HTDMA) and an optical particle counter the relation between hygroscopic and optical properties has been investigated for 300 nm urban atmospheric particles. Systematic new features of the state of mixture of optically important submicrometer particles were revealed. Besides a high fraction of absorbing (soot) chains, the most hydrophobic 300 nm particles had a high (~30%) number fraction that is classified as ``transparent spheres,'' which could be anything from glassy spheres to high molecular hydrophobic organic droplets. These optical modes need to be considered when using HTDMA growth factors to convert dry aerosol properties to climatically relevant ambient levels.

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