Acidic-aerosol size distributions during SCAQS (Southern California Air Quality Study). Final report

Technical Report · Wed Nov 01 04:00:00 EST 1989

OSTI ID:7069236

John, W; Wall, S M; Ondo, J L; Winklmayr, W

Ambient aerosol in the size range 0.075 - 16 micrometers was sampled with Berner cascade impactors during the summer and fall intensive sampling periods of the Southern California Air Quality Study (SCAQS) of 1987. Stage mass data were inverted by a modified version of the Twomey nonlinear iterative algorithm and modes in the inverted size distributions were fitted with lognormal functions. During SCAQS, most of the inorganic particle mass was in the droplet mode except during a period of exceptionally low relative humidity. Nitrate was internally mixed with sulfate in the droplet mode. Since most of the aerosol fine mass is included in the ions analyzed, the observed condensation and droplet modes characterize the overall size distribution in the 0.1-1 micrometer range, previously described by Whitby as a single accumulation mode.

• Research Organization: California Dept. of Health Services, Berkeley, CA (USA). Air and Industrial Hygiene Lab.
• OSTI ID: 7069236
• Report Number(s): PB-90-150756/XAB; CA/DOH/AIHL/SP--51
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AEROSOLS
AIR POLLUTION
AIR POLLUTION MONITORING
AIR QUALITY
AIR SAMPLERS
ALGORITHMS
CALIFORNIA
COLLOIDS
DEPOSITION
DISPERSIONS
DOCUMENT TYPES
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL QUALITY
EQUIPMENT
FEDERAL REGION IX
MATHEMATICAL LOGIC
NITRATES
NITROGEN COMPOUNDS
NORTH AMERICA
OXYGEN COMPOUNDS
PARTICLE SIZE
POLLUTION
PROGRESS REPORT
SAMPLERS
SIZE
SOLS
SULFATES
SULFUR COMPOUNDS
USA