Limited impact of atmospheric nitrogen deposition on marine productivity due to biogeochemical feedbacks in a global ocean model.

Somes, Christopher J. , Landolfi, Angela , Koeve, Wolfgang and Oschlies, Andreas (2016) Limited impact of atmospheric nitrogen deposition on marine productivity due to biogeochemical feedbacks in a global ocean model. Open Access Geophysical Research Letters, 43 (9). pp. 4500-4509. DOI 10.1002/2016GL068335.

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Abstract

The impact of increasing anthropogenic atmospheric nitrogen deposition on marine biogeochemistry is uncertain. We performed simulations to quantify its effect on nitrogen cycling and marine productivity in a global 3-D ocean biogeochemistry model. Nitrogen fixation provides an efficient feedback by decreasing immediately to deposition, whereas water column denitrification increases more gradually in the slowly expanding oxygen deficient zones. Counterintuitively, nitrogen deposition near oxygen deficient zones causes a net loss of marine nitrogen due to the stoichiometry of denitrification. In our idealized atmospheric deposition simulations that only account for nitrogen cycle perturbations, these combined stabilizing feedbacks largely compensate deposition and suppress the increase in global marine productivity to <2%, in contrast to a simulation that neglects nitrogen cycle feedbacks that predicts an increase of >15%. Our study emphasizes including the dynamic response of nitrogen fixation and denitrification to atmospheric nitrogen deposition to predict future changes of the marine nitrogen cycle and productivity.

Document Type: Article
Keywords: atmospheric nitrogen deposition; N2 fixation; denitrification; marine productivity
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > The Future Ocean - Cluster of Excellence > FO-R05
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2016GL068335
ISSN: 0094-8276
Projects: SOLAS, SCOPE, IGBP, GESAMP, SOPRAN, SFB754, Future Ocean
Date Deposited: 31 May 2016 11:03
Last Modified: 01 Feb 2019 15:04
URI: http://oceanrep.geomar.de/id/eprint/32962

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