드레이크해협 극전선에서 이산화탄소 시스템

Abstract

Continuous determination of oceanic carbonate parameters was carried out across the Antarctic Polar Front in the Drake Passage during the 1998-1999, 2001-2002, 2002-2003, and 2003-2004 austral summers. A flowing pCO2 system and an automated TA titration system were installed onboard of the Russian R/V Yuzhmorgeologyia for measuring pCO2, pH, TA, and TCO2. Sea surface pCO2 was automatically measured every 2 minute by the flowing pCO2 system, and TA values were determined every hour with the TA titration system. Water samples were also collected every hour to follow the changes in nutrients and chlorophyll concentrations along the cruise lines. Sea surface temperature and salinity fluctuated greatly across the polar front. Strong variations were also observed in nutrient concentrations across the front. Silicate concentrations significantly increased traversing the frontal zone as well as increasing nitrate and phosphate concentrations toward the south. Higher surface pCO2 values were observed along most of the cruise lines, while lower surface pCO2 values were found at frontal zones in early Decembers. Clear correlation between pCO2 and nutrients in the south of the Polar Front suggest that the biological removal of CO2 is more efficient in the south of the front (the Silica Ocean) than in the north of the front (the Carbonate Ocean at least during the study periods.