On the sensitivity of particle size to relative humidity for Los Angeles aerosols

Peter H. McMurry, Mark R. Stolzenburg

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A Tandem Differential Mobility Analyzer (TMDA) system (1) was used to measure the sensitivity of particle size to relative humidity for monodisperse Los Angeles aerosols. Measurements were made at Claremont, CA on 13 days between 19 June and 3 September 1987, in conjunction with the Southern California Air Quality Study (SCAQS). The particle sizes that were studied ranged from 0.05 μm to 0.5 μm diameter at ambient relative humidity (typically 45-65%). The data provide clear evidence that particles of a given size include both a hygroscopic and a nonhygroscopic fraction, indicating that the aerosol is externally mixed. In addition, for the hygroscopic fraction larger particles (0.4 and 0.5 μm) were relatively more hygroscopic than smaller (0.05 and 0.2 μm) particles.

Original languageEnglish (US)
Title of host publicationProceedings - A&WMA Annual Meeting
Editors Anon
PublisherPubl by Air & Waste Management Assoc
Volume8
StatePublished - Dec 1 1989
EventProceedings - 82nd A&WMA Annual Meeting - Anaheim, CA, USA
Duration: Jun 25 1989Jun 30 1989

Other

OtherProceedings - 82nd A&WMA Annual Meeting
CityAnaheim, CA, USA
Period6/25/896/30/89

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