Studies on carbon dioxide and volatile organic compounds in the Southern Ocean that affect climate system

我们进行了观测研究，主要目的是澄清南大洋CO2、CH 4和挥发性有机化合物的海气通量及其控制因素（特别是侧重于生物活动）。2011财政年度开发了一个利用腔衰荡光谱分析仪测量海洋CO2和CH 4的新系统。2012财政年度11月至2月期间，在南大洋的R/V米拉伊号上对二氧化碳和甲烷分压进行了持续测量。在水文站还测量了海洋二甲基硫和异戊二烯。观测结果表明，由于海冰融化、水平/垂直混合和生物活动的影响，南大洋60 S以南海域的CO2/CH 4通量存在正和负两种情况，其中，由于生物活动的影响，VOC浓度最大值出现在次表层。

We have conducted observational studies with the main objective of clarifying air-sea fluxes of CO2, CH4, and volatile organic compounds (VOC) and factors controlling them (especially focusing on biological activity) in the Southern Ocean. A new system for measurements of oceanic CO2 and CH4 were developed in FY2011 by using a Cavity Ring Down Spectroscopy analyzer. Underway measurements of partial pressure of CO2 and CH4 were made aboard the R/V Mirai in the Southern Ocean over the period from November to February in FY2012. Oceanic dimethyl sulfide and isoprene were also measured at the hydrographic stations. Observed results indicate that the Southern Ocean south of 60S exhibited both negative and positive air-sea CO2/CH4 fluxes due to effects of sea-ice melting, horizontal/vertical mixing, and biological activity, and maximum concentrations of VOC occurred in sub-surface layer due to biological activity.