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Project Status: complete

Report Published May 1999:

Title: Measurements made aloft by a twin-engine aircraft to support the SCOS97-NARSTO study.

Principal Investigator / Author(s): Blumenthal, Donald

Contractor: Sonoma Technology

Contract Number: 96-309

Research Program Area: Atmospheric Processes

Topic Areas: Field Studies, Monitoring


During the summer of 1997, the Southern California Ozone Study (SCOS97) was conducted to update aerometric and emissions databases and model applications for ozone episodes in Southern California and to quantify the contributions of interbasin transport to exceedances of the ozone standards in neighboring air basins. One of six SCOS97 sampling aircraft was a Piper Aztec. The Aztec performed northern-boundary measurements of aloft air quality and meteorology in the Southern Mojave Desert and Northern Los Angles basin. The aircraft also served as a backup for another SCOS97 aircraft that performed flights in the western part of the study domain. The Aztec data were reviewed to identify the occurrence and types of ozone layers aloft and to estimate the initial and boundary conditions in the Desert on the first day of Intensive Operational Periods (lOPs). Ozone carryover aloft was seen on all mornings in vertical spiral measurements in the Basin. Detached layers above the boundary layer were seen on about 20 percent of Basin morning and afternoon spirals. Offshore elevated ozone layers of up to 184 ppb were seen below 500 m. The morning ozone concentrations in the Desert ranged from 40 to 70 ppb and the NOy concentrations ranged from 2 to 4 ppb, indicating relatively clean, but not pristine boundary conditions. These data are part of the SCOS97 data archive for use in further analysis and modeling.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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