the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Contrasting juxtaposition of two paradigms for diazotrophy in an Earth System Model of intermediate complexity
Abstract. Nitrogen fixers, or diazotrophs, play a key role in the carbon and nitrogen cycle of the world oceans, but the controlling mechanisms are not comprehensively understood yet. The present study compares two paradigms on the ecological niche of diazotrophs in an Earth System Model (ESM). In our standard model configuration, which is representative for most of the state-of-the-art pelagic ecosystem models, diazotrophs take advantage of zooplankton featuring a lower food preference for diazotrophs than for ordinary phytoplankton. We compare this paradigm with the idea that diazotrophs are more competitive under oligotrophic conditions, characterized by low (dissolved, particulate, organic and inorganic) phosphorous availability. Both paradigms are supported by observational evidence and lead to a similar good agreement to the most recent and advanced observation-based nitrogen fixation estimate in our ESM framework. Further, we illustrate that the similarity between the two paradigms breaks in a RCP 8.5 anthropogenic emission scenario. We conclude that a more advanced understanding of the ecological niche of diazotrophs is mandatory for assessing the cycling of essential nutrients, especially under changing environmental conditions. Our results call for more in-situ measurements of cyanobacteria biomass if major controls of nitrogen fixation in the oceans are to be dissected.
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- SC1: 'Comments on “Contrasting juxtaposition of two paradigms for diazotrophy in an Earth System Model of intermediate complexity”', Andreas Oschlies, 11 Apr 2020
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RC1: 'Review', Anonymous Referee #1, 21 May 2020
- AC1: 'Response Reviewer #1', Ulrike Loeptien, 10 Jun 2020
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RC2: 'Review of manuscript', Anonymous Referee #2, 25 May 2020
- AC2: 'Response Reviewer #2', Ulrike Loeptien, 10 Jun 2020
- SC1: 'Comments on “Contrasting juxtaposition of two paradigms for diazotrophy in an Earth System Model of intermediate complexity”', Andreas Oschlies, 11 Apr 2020
-
RC1: 'Review', Anonymous Referee #1, 21 May 2020
- AC1: 'Response Reviewer #1', Ulrike Loeptien, 10 Jun 2020
-
RC2: 'Review of manuscript', Anonymous Referee #2, 25 May 2020
- AC2: 'Response Reviewer #2', Ulrike Loeptien, 10 Jun 2020
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Cited
3 citations as recorded by crossref.
- Retracing cyanobacteria blooms in the Baltic Sea U. Löptien & H. Dietze 10.1038/s41598-022-14880-w
- Cyanobacteria blooms in the Baltic Sea: a review of models and facts B. Munkes et al. 10.5194/bg-18-2347-2021
- Ambiguous controls on simulated diazotrophs in the world oceans U. Löptien & H. Dietze 10.1038/s41598-022-22382-y