A significant term in the global ozone atmospheric budget is the uptake by ocean surfaces, but direct observations are quite rare and uncertain. Due to the limited knowledge of the physical and chemical processes involved in the oceanic ozone destruction, climate models typically use only one singular ozone deposition value for the oceans. In order to improve these models, and to have a better understanding of the deposition process into the oceans, direct measurements of the air-sea flux of ozone have been made aboard the NOAA Ship Ronald H. Brown during 2008 at 51°S, 38°W in the Atlantic region of the Southern Ocean (GasEx). The ozone concentration was measured by a fast-response instrument deployed by INSTAAR, University of Colorado in collaboration with the NOAA ESRL/Physical Science Division (PSD). This fast response monitor is based on the chemiluminescence principle and, when combined with sonic anemometer vertically velocity, is used to estimate the ozone flux over the ocean by direct eddy correlation (EC). The preliminary results show a median value for the ozone deposition in the studied region of about 0.015 cm/s.