J.E. Johnson (e-mail: johnson@pmel.noaa.gov, 206-526-6355,) and T.S. Bates (Both at: NOAA-PMEL, Seattle, WA 98115)
B. Johnson and S. Oltmans (Both at NOAA-CMDL, Boulder, CO 80303)
During the ACE-1 experiment, 16 EN-SCI Electro-chemical ozonesondes were launched from the deck of the NOAA ship DISCOVERER, yielding ozone profiles from the ocean surface to approximately 35 km altitude. Nine profiles were made during the Seattle to Hobart transit leg (Oct. 11 to Nov. 10) that clearly showed the equatorial minimum in stratospheric ozone. North of 20° S the mid-tropospheric ozone levels were generally near 40 ppb, however, between 40° S and 20° S the mid tropospheric ozone concentrations were much higher, between 60 and 80 ppb. During the ACE-1 intensive south of Tasmania (Nov. 15 to Dec. 13) seven profiles were made that generally showed low ozone concentrations in the boundary layer (mean concentration at 500m altitude, 18.3 ppb) and higher concentrations in the free troposphere (mean concentration at 3000m altitude, 30.9 ppb). Each Lagrangian experiment was initialized with an ozone profile.