Sensitivity of particle size to relative humidity for Los Angeles aerosols
A TDMA system (Tandem Differential Mobility Analyzer) 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 June 19 and Sept. 3, 1987, in conjunction with the Southern California Air Quality Study (SCAQS). The particle sizes studied ranged from 0.05 micrometer to 0.5-micrometer diameter at ambient relative humidity (typically 45-65%). The data provide clear evidence that these atmospheric aerosols were externally mixed. The data also show that for the hydrophilic aerosol fraction, the larger particles (0.4-0.5 micrometer) grew more when humidified than did the smaller particles (0.05-0.2 micrometer). The report summarizes measurement results.
- Research Organization:
- Minnesota Univ., Minneapolis (USA). Particle Technology Lab.
- OSTI ID:
- 6329196
- Report Number(s):
- PB-89-156095/XAB; PTL-PUB-654
- Country of Publication:
- United States
- Language:
- English
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