Global Marine N2 Fixation Estimates: from Observations to Models.

Landolfi, Angela , Kähler, Paul, Koeve, Wolfgang and Oschlies, Andreas (2018) Global Marine N2 Fixation Estimates: from Observations to Models. Open Access Frontiers in Microbiology, 9 . Art.Nr. 2112. DOI 10.3389/fmicb.2018.02112.

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Fixed nitrogen (N) limits productivity across much of the low-latitude ocean. The magnitude of its inventory results from the balance of N input and N loss, the latter largely occurring in regionally well-defined low-oxygen waters and sediments (denitrification and anammox). The rate and distribution of N input by biotic N2 fixation, the dominant N source, is not well known. Here we compile N2 fixation estimates from experimental measurements, tracer-based geochemical and modelling approaches, and discuss their limitations and uncertainties. The lack of adequate experimental data coverage and the unsufficient understanding of the controls of marine N2 fixation result in high uncertainties, which make the assessment of the current N-balance a challenge. We suggest that a more comprehensive understanding of the environmental and ecological interaction of marine N2 fixers is required to advance the field towards robust N2 fixation rates estimates and predictions.

Document Type: Article
Keywords: Marine N2 fixation, N-cycle balance, Denitrification, marine productivity, marine heterotrophic diazotrophy, Nitrogen Isotopes
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > SFB 754 > B1
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: Yes
Publisher: Frontiers
Projects: SFB754
Date Deposited: 07 Sep 2018 09:52
Last Modified: 19 Mar 2021 11:56

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