 The study examined the factors that control the partial pressure of carbon dioxide, PCO2, in the Pacific sector of the Southern Ocean. It found that the PCO2 varied significantly depending on location, with the highest levels occurring in the Ross Sea and lowest levels in the western Antarctic Peninsula and Weddle Sea. The PCO2 was also affected by the temperature and salinity of the ocean, as well as the amount of oxygen in the atmosphere compared to the amount of oxygen in the water. Additionally, the study found that the PCO2 was influenced by the presence or absence of sea ice, which can affect the amount of sunlight reaching the ocean's surface. Finally, the study concluded that the AirSea's CO2 fluxes vary greatly across the region, with some areas showing positive fluxes while others show negative fluxes. This article was authored by ARAMO, Ki-Hung Park, Jisoo Park, and others.