We describe a unique data set acquired from an oceanographic intensive observation period (IOP) conducted onboard the NOAA Ship Ronald H. Brown, during the 7th NOAA Aerosols and Ocean Science Expedition (AEROSE). A composite of tropospheric ozone profiles retrieved from daily ozonesondes launched along a latitudinal transect between 25N and 25 S, aims to study the Northern Hemisphere (NH) and Southern Hemisphere (SH) ozone transition during a northwest to southeast Atlantic crossing from Charleston, SC (32.85N, 79.94W), to Cape Town, South Africa (33.55 S, 18.22 E) during the months of July and August, 2011. Sounding data is complemented with shipboard tracers, NOAA HYSPLIT back-trajectory analysis and satellite observations during this time frame. The study concentrates in four latitudinal zones, similar to the ones described by the Aerosol99 Campaign and also seeks to assess the effects of the African biomass burning on the development of the “Tropical Atlantic Ozone Paradox”.