Articles | Volume 17, issue 10
Research article
28 May 2020
Research article |  | 28 May 2020

Spatial variations in sedimentary N-transformation rates in the North Sea (German Bight)

Alexander Bratek, Justus E. E. van Beusekom, Andreas Neumann, Tina Sanders, Jana Friedrich, Kay-Christian Emeis, and Kirstin Dähnke

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Cited articles

Alkhatib, M., Lehmann, M. F., and del Giorgio, P. A.: The nitrogen isotope effect of benthic remineralization-nitrification-denitrification coupling in an estuarine environment, Biogeosciences, 9, 1633–1646,, 2012. 
Aller, R. C.: Benthic Fauna and Biogeochemical Processes in Marine Sediments: The Role of Burrows Structures, in: Nitrogen cycling in Coastal Marine Environments, edited by: Blackburn, T. H. and Sørensen, J., Scope, Chichester, 301–338, 1988. 
Bale, N. J., Villanueva, L., Fan, H., Stal, L. J., Hopmans, E. C., Schouten, S., and Sinninghe Damste, J. S.: Occurrence and activity of anammox bacteria in surface sediments of the southern North Sea, FEMS Microbiol. Ecol., 89, 99–110, 2014. 
Blackburn, T. H. and Henriksen, K.: Nitrogen cycling in different types of sediments from Danish waters, Limnol. Oceanogr., 28, 477–493, 1983. 
Brase, L., Sanders, T., and Daehnke, K.: Anthropogenic changes of nitrogen loads in a small river: external nutrient sources vs. internal turnover processes, Isot. Environ. Healt. S., 54, 168–184, 2018.  
Short summary
The following paper highlights the importance of benthic N-transformation rates in different sediment types in the southern North Sea as a source of fixed nitrogen for primary producers and also as a sink of fixed nitrogen. Sedimentary fluxes of dissolved inorganic nitrogen support ∼7 to 59 % of the average annual primary production. Semi-permeable and permeable sediments contribute ∼68 % of the total benthic N2 production rates, counteracting eutrophication in the southern North Sea.
Final-revised paper