Figure 2. Barium excess of sediment core PS1506-1, supplement to: Shimmield, Graham; Derrick, S; Mackensen, Andreas; Grobe, Hannes; Pudsey, Carol J (1994): The history of barium, biogenic silica and organic carbon accumulation in the Weddell Sea and Antarctic Ocean over the last 150,000 years. In: Zahn, R; Kaminski, M A; Labeyrie, L & Pedersen, T F (eds.), Carbon Cycling in the Glacial Ocean: Constraints on the Ocean's Role in Global Change, NATO ASI Series, Springer, Berlin, Heidelberg, New York, 117, 555-574

Graham Shimmield, S Derrick, Andreas Mackensen, Hannes Grobe & Carol J Pudsey
Over the last decade many regional palaeoceanographic studies have found evidence for enhanced primary productivity during glacial episodes, particularly in the equatorial Pacific and off northwest Africa. These studies have given rise to the "glacial productivity hypothesis" which has suggested that enhanced oceanic biomass during glacial times supported an efficient removal of organic carbon from the euphotic zone, contributing to lower atmospheric CO2 levels recorded in ice cores. Recently, studies from the Southern Ocean have...
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