[M-IS15] 南大洋・南極氷床が駆動する全球気候変動

[MIS15-11] 南大洋インド洋区季節海氷域における溶存炭酸物質の空間分布と時間変化

*橋田 元¹、高村 友海¹、野村 大樹²、吉川 久幸³ (1.大学共同利用機関法人　情報システム研究機構　国立極地研究所、2.北海道大学大学水産学部、3.北海道大学大学院環境科学院)

キーワード：溶存無機炭酸物質、南大洋、季節海氷域

To clarify the variations of carbonate system in the Southern Ocean, multi-ship observations and line observation which closes ice edge were performed since JARE-51st (2009/10 austral summer) on-board Icebreaker “SHIRASE” and T/V Umitaka-Maru of TUMSAT (Tokyo University of Marine Science and Technology). Although seasonal changes of pCO₂ are attributed to thermodynamics and biological activity , Analysis of DIC vertical profiles reveal that biological uptake and entrainment of sub-surface water played major role and air-sea CO₂ exchange can contribute a little.