GEOMAR  Service  Events

September 09, 2014: SFB754 Kolloquium

Sam Jaccard, University of Bern, Switzerland: "Deglacial weakening of the oceanic soft tissue pump: global constraints from nitrogen isotopes and oxygenation proxies"

 

10:15 h Lecture Hall, GEOMAR, Düsternbrooker Weg 20

Abstract:

A new global analysis of marine oxygen and nitrogen proxies provides a broad perspective on how the oceanic sequestration of CO2 by the marine ecosystem weakened over the end of the last ice age. The results are consistent with a release of CO2 to the atmosphere that was front-loaded early in the deglacation, caused by declining iron fertilization, accelerating organic matter remineralization, and increasing deep ocean ventilation. The 'bipolar see-saw', on the other hand, dominated transient deglacial changes in the biological pump.

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