Geochemistry of ODP Site 145-882 ...

• Main Authors: Jaccard, Samuel L, Galbraith, Eric Douglas, Sigman, Daniel M, Haug, Gerald H, Francois, Roger, Pedersen, Thomas F, Dulski, Peter, Thierstein, Hans R
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2009
• Subjects: Composite Core; Leg145; Joides Resolution; Ocean Drilling Program ODP; Subarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.716782; https://doi.pangaea.de/10.1594/PANGAEA.716782

Measurements of benthic foraminiferal cadmium:calcium (Cd/Ca) have indicated that the glacial-interglacial change in deep North Pacific phosphate (PO4) concentration was minimal, which has been taken by some workers as a sign that the biological pump did not store more carbon in the deep glacial ocean. Here we present sedimentary redox-sensitive trace metal records from Ocean Drilling Program (ODP) Site 882 (NW subarctic Pacific, water depth 3244 m) to make inferences about changes in deep North Pacific oxygenation - and thus respired carbon storage - over the past 150,000 yr. These observations are complemented with biogenic barium and opal measurements as indicators for past organic carbon export to separate the influences of deep-water oxygen concentration and sedimentary organic carbon respiration on the redox state of the sediment. Our results suggest that the deep subarctic Pacific water mass was depleted in oxygen during glacial maxima, though it was not anoxic. We reconcile our results with the ... : Supplement to: Jaccard, Samuel L; Galbraith, Eric Douglas; Sigman, Daniel M; Haug, Gerald H; Francois, Roger; Pedersen, Thomas F; Dulski, Peter; Thierstein, Hans R (2009): Subarctic Pacific evidence for a glacial deepening of the oceanic respired carbon pool. Earth and Planetary Science Letters, 277(1-2), 156-165 ...