The Southern Oxidants Study (SOS), in collaboration with other organizations and programs, will conduct two major Field Campaigns during the summer of 1999. The Nashville/Middle Tennessee region will be the focus of measurements planned for June/July with the focus shifting to Atlanta in August.

The Nashville Field Intensive is scheduled to run from June 15 through July 15, 1999. Measurements will focus on obtaining an improved understanding of the processes that control the formation and distribution of fine particles and ozone. Three study themes are identified in the Science Plan:

1. Local vs. regional contrasts- similarities/differences between regions of the country and the relative importance of local emissions versus transported pollution.
2. Ozone and PM formation in plumes- how fast and how efficiently are O3 and fine particles produced in urban and power plant plumes.
3. Diurnal cycle in chemistry and meteorology- role of nighttime chemistry and transport in the formation and distribution of O3 and fine particles.

These themes will be addressed through a series of coordinated measurements involving instrumented aircraft and a ground-based network of chemistry and meteorological measurements. The following instrumented aircraft will participate:

• NOAA WP-3D - 4-engine turboprop in situ measurements of chemistry and meteorology
• DOE G-1 - 2-engine turboprop in situ measurements of chemistry
• TVA Bell 205 - helicopter in situ measurements of chemistry and meteorology
• deHavilland Caribou - 2-engine turboprop airborne remote sensing of ozone and aerosol-backscatter using lidar

Three new ground-based chemistry monitoring sites operational during the study:

• Dickson - 53 km WNW of Nashville, an upwind, rural site.
• Polk Building - downtown Nashville, 110 meters above the street, providing a record of the urban emission mix.
• Cornelia Fort Air Park - 8km NE of Nashville, a downwind, urban site.

Ground-based chemistry and meteorological measurements:

• DOAS Measurements - long-path absorbtion measurements from both Cornelia Fort and the State of Tennesse Department of Health and Environment Laboratory.
• Ozone Profiling - ozonesonde releases from the National Weather Service site near Old Hickory Lake.

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