Articles | Volume 23, issue 1
https://doi.org/10.5194/bg-23-283-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-283-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 Jan 2026
Research article |
| 09 Jan 2026
| 09 Jan 2026
A comprehensive porewater isotope model for simulating benthic nitrogen cycling: description, application to lake sediments, and uncertainty analysis
Alessandra Mazzoli
CORRESPONDING AUTHOR
Department of Environmental Sciences, University of Basel, Basel, 4056, Switzerland
Peter Reichert
Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, 8600, Switzerland
retired
Claudia Frey
Department of Environmental Sciences, University of Basel, Basel, 4056, Switzerland
Cameron M. Callbeck
Department of Environmental Sciences, University of Basel, Basel, 4056, Switzerland
Tim J. Paulus
Department of Environmental Sciences, University of Basel, Basel, 4056, Switzerland
Jakob Zopfi
Department of Environmental Sciences, University of Basel, Basel, 4056, Switzerland
Moritz F. Lehmann
Department of Environmental Sciences, University of Basel, Basel, 4056, Switzerland
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Nitrification and nitrifiers play an important role in marine nitrogen and carbon cycles by converting ammonium to nitrite and nitrate. Nitrification could affect microbial community structure, marine productivity, and the production of nitrous oxide – a powerful greenhouse gas. We introduce the newly constructed database of nitrification and nitrifiers in the marine water column and guide future research efforts in field observations and model development of nitrification.
John C. Tracey, Andrew R. Babbin, Elizabeth Wallace, Xin Sun, Katherine L. DuRussel, Claudia Frey, Donald E. Martocello III, Tyler Tamasi, Sergey Oleynik, and Bess B. Ward
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Pacific water flowing eastward through the Canadian Arctic plays an important role in redistributing nutrients to the northwest Atlantic Ocean. Using samples collected from northern Baffin Bay to the southern Labrador Shelf, we show that stable isotopic ratios in seawater nitrate reflect the fraction of Pacific to Atlantic water. These results provide a new framework for interpreting patterns of nitrogen isotopic variability recorded in modern and archival organic materials in the region.
Sigrid van Grinsven, Kirsten Oswald, Bernhard Wehrli, Corinne Jegge, Jakob Zopfi, Moritz F. Lehmann, and Carsten J. Schubert
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Short summary
Nitrogen (re-)cycling in sediments plays a key role in aquatic environments, but involves many overlapping biogeochemical processes that are hard to separate. We developed a new comprehensive sedimentary nitrogen isotope model to disentangle these reactions. Using field data from a Swiss lake and statistical tools, we demonstrated the robustness and validity of our modelling framework for a broad range of applications.
Nitrogen (re-)cycling in sediments plays a key role in aquatic environments, but involves many...
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