Research Contracts

New Search

Project at a Glance

Project Status: complete

Title: Cloud and precipitation scavenging processes in the South Coast Air Basin

Principal Investigator / Author(s): Hegg, Dean A

Contractor: University of Washington

Contract Number: A4-143-32

Research Program Area: Atmospheric Processes

Topic Areas: Acid Deposition


In this report, the instrumentation package utilized aboard the University of Washington's C-131A research aircraft during the SCAQS program is documented. Calibration procedures and adjustments are also presented.

The responsibilities of the University of Washington's Cloud and Aerosol Research Group under Contract A4-143-32 with the California Air Resources Board (CARB) consisted of providing an aircraft from which to obtain airborne measurements of particles and trace gases during the 1987 Southern California Air Quality Study (SCAQS). These measurements included concentrations of SO2, SO4-, SO3-, PAN, carbonyls, elemental carbon and HNO by means of filter sampling. Canister samples for hydrocarbon speciation were also obtained. Analysis of these measurements is being undertaken by other CARB contractors. In addition, ancillary meteorological and selected continuous trace chemical measurements were obtained. The ancillary measurements have been screened for errors, calibrated and read onto computer tapes. These tapes have been sent to ERT for archiving.

An additional task under this contract was the provision of atmospheric particle size distributions measured aboard the aircraft during SCAQS. These average particle size distributions are presented and discussed in this Final Report.

A total of nine research flights were flown during the SCAQS project, five morning flights and four in the afternoon. Four sampling orbits were made on each flight at predetermined locals.


For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

Stay involved, sign up with CARB's Research Email Distribution List