Arctic Ocean pH history of the past 140,000 years based on δ11B in planktic foraminifera and microbial biomarkers in sediment records

Jannik Martens1,2, Sarah Hurley1, Helen Katherine Coxall3, Matt O'Regan3, Flor Vermassen3 and Baerbel Hoenisch1, (1)Lamont-Doherty Earth Observatory of Columbia University, Palisades, United States, (2)Stockholm University, Department of Environmental Science, Stockholm, Sweden, (3)Stockholm University, Department of Geological Sciences, Stockholm, Sweden