Studies on the air-sea CO2 exchange in the Southern Ocean

我们进行了观测研究，主要目的是弄清南大洋的海气CO_2通量及其控制因素。在2009财年和2010财年的12月至1月期间，对南大洋的CO_2分压、溶解无机碳、pH和溶解氧进行了测量。观测结果表明，生物活动对海气CO_2通量的时空分布有重要影响。结合历史数据，我们确定了长期以来表层海水中CO_2分压的增加和pH值的下降，主要是由于海洋CO_2的吸收。

We have conducted observational studies with the main objective of clarifying air-sea CO_2 flux and factors controlling it in the Southern Ocean. Measurements of partial pressure of CO_2, dissolved inorganic carbon, pH, and dissolved oxygen were made in the Southern Ocean over the period from December to January in FY2009 and FY2010. Observed results indicate that biological activity plays an important role in determining temporal/spatial distribution of air-sea CO_2 flux. By combining historical data, we determined the long-term increase of partial pressure of CO_2 in surface seawater and decrease of pH, mainly due to the oceanic CO_2 uptake.