Oden Southern Ocean expeditions, joint efforts by the US National Science Foundation and the Swedish Polar Research Secretariat, started in austral summer of 2006/07 and will continue to austral summer 2011/12. Oden cruise tracks pass through the West Antarctic sea-ice region (Bellingshausen Sea, Amundsen Sea and Ross Sea), the least studied sea-ice region to date in the world’s oceans, but the most dramatically changing region of Antarctic sea ice in recent decades, with the largest increase in sea-ice extent observed for the Ross Sea and the largest decrease in sea-ice extent for the Bellingshausen Sea. This paper presents underway measurements of climatic data (air temperature, humidity, pressure and dew point, and wind speed and direction) and sea-water physical parameters (temperature, salinity, conductivity) from 60° W to 170° E during the first three Oden cruises from 2006 to 2008. Intecomparison results between climate data and sea-water parameters of the three seas and for the 3 years, as well as their connection to sea-ice presence, formation and melting will be presented. The water mass variation along the cruise will also be examined. Preliminary results indicate that air temperature correlated well with the sea surface temperature, except at the high latitudes of the Ross Sea where sea-water temperature approached the freezing point while air temperatures could be subfreezing coming from the nearby Antarctic continent. Along the ship track, the zones of sea ice and open water clearly show that the fall of air temperature correlated well with the presence of sea ice except in the high latitudes of the Ross Sea. Results also show the drop of salinity as the ship passed through areas where ice was present and melting. The salinity and the temperature in the Ross Sea were both higher indicating ice had been removed from there by advection rather than melting in place, so the water was also heated by incoming sunlight. A second-order relation between air temperature and humidity is also found.