3-7 September 2018
Audimax | Kiel University
Europe/Berlin timezone

Nitrogen-carbon connections in a deoxygenating ocean

7 Sep 2018, 15:30
Audimax-Hörsaal-C (Kiel University)


Kiel University

Oral 10 Biogeochemical Cycles: Feedbacks and Interactions 10 Biogeochemical Cycles: Feedbacks and Interactions


Dr Angela Landolfi (GEOMAR)


Anthropogenic warming is expected to drive oxygen (O$_2$) out of the ocean causing a massive perturbation of the nitrogen (N) cycle leading to increasing N removal and oceanic N$_2$O production via denitrification, which would trigger enhanced N$_2$ fixation. Our intermediate complexity Earth system model simulations reveal that N$_2$ fixation does not compensate the enhanced N loss due increased phosphorus (P) limitation. However, emerging feedbacks between the carbon (C) and N cycle can stabilize the N-inventory and N$_2$O emissions under global warming. The expansion of water column denitrification under ocean deoxygenation is offset by decreasing benthic denitrification brought about by a reduction in export production. This latter is related to ocean warming and yields a decline in oceanic N$_2$O production, which contributes to the reduction in oceanic N$_2$O emissions by 2100. Our model simulations support the existence of strong regulatory feedbacks among the O$_2$-C-N and P-cycles that maintain N inventory homeostasis and contribute to stabilize climate against anthropogenic changes.

Affiliation GEOMAR
Position Senior Scientist
Email Address alandolfi@geomar.de
Are you a SFB 754 / Future Ocean member? Yes

Primary authors

Dr Angela Landolfi (GEOMAR) Wolfgang Koeve (GEOMAR, Biogeochemical Modelling) Dr Christopher Somes (GEOMAR Helmholtz Centre for Ocean Research Kiel) Prof. Andreas Oschlies (Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR))

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