Deoxygenation of the upper ocean on glacial-interglacial timescales – implications for the global nutrient inventory and carbon cycle dynamics.

The second aspect of the research seeks to address the consequences of past changes in Southern Ocean intermediate water circulation and nutrient biogeochemistry on the extent of low-latitude oxygen minimum zones on millennial timescales. Notably, we aim to quantify the relative contributions of changes in the oxygen supply to the (sub)tropical surface ocean and variability in O2 utilization related to the remineralization of sinking organic particles from the low-latitude photic zone.

Relevant publications:

Cartapanis, O. A., Bianchi, D. Jaccard, S.L., Galbraith, E.D. Global pulses of organic carbon burial in deep-sea sediments during glacial maxima. Nature Communications, 7:10796, 2016.

Hayes, C.T., Martínez-García, A., Hasenfratz, A., Jaccard, S.L., Hodell, D.A., Sigman, D.M., Haug, G.H., Anderson, R.F. A stagnation event in the deep South Atlantic during the last interglacial period. Science, 346, 1514-1517, 2014.

Jaccard, S.L., Galbraith, E.D., Frölicher, T.L., Gruber, N., Ocean (De)Oxygenation across the last deglaciation, Oceanography, 27, 26-36, 2014

Galbraith, E.D., Kienast, M. et al. Acceleration of oceanic denitrification during deglacial warming. Nature Geoscience, 6, 579-583, 2013.

Eugster, O., Gruber, N., Deutsch, C. Jaccard, S.L., Payne, M.R. The dynamics of the marine nitrogen cycle across the deglaciation. Paleoceanography, 28, 116-129. 2013.

Jaccard, S.L., Galbraith, E.D., Large climate-driven changes of oceanic concentrations during the last deglaciation, Nature Geoscience, 5, 151-156, 2012.