Land influence decouples benthic nutrient fluxes on the Siberian Arctic Ocean shelves
Abstract Land permafrost thaw transfers increasing amounts of organic matter and nutrients to the Arctic Ocean. These nutrients could stimulate primary production directly, or indirectly following remineralization in sediments. Projections of this effect are limited by scarce observations and poor understanding of the underlying controls. Here, we focus on the Kara, Laptev, and East Siberian Sea shelves that receive strong input from large rivers and coastal erosion, linking ship‐board measurements of sediment–water nutrient fluxes to environmental parameters associated with land input. Ammonium and nitrite releases were positively related to high concentration and low decomposition state of terrigenous organic matter, based on biomarkers. Nitrate release was related to O 2 penetration depth. Phosphate and silicate release were highest at stations with strong marine influence. Our findings suggest that changes in environmental conditions, such as land input, might alter the nutrient balance in the Siberian Arctic Ocean, with implications for ecological and biogeochemical processes.
Authors
- Igor Semiletov
- Stefano Bonaglia (ORCID: https://orcid.org/0000-0003-4366-0677)
- I. A. Gangnus (ORCID: https://orcid.org/0000-0003-2347-2492)
- Nicholas E. Ray (ORCID: https://orcid.org/0000-0002-1959-3120)
- Örjan Gustafsson (ORCID: https://orcid.org/0000-0002-1922-0527)
- Adele Maciute (ORCID: https://orcid.org/0000-0002-9979-911X)
- Evgeniy Yakushev (ORCID: https://orcid.org/0000-0002-5801-4662)
- Birgit Wild (ORCID: https://orcid.org/0000-0002-9611-0815)
- Lewis Sauerland (ORCID: https://orcid.org/0000-0002-6169-876X)
- Oleg Dudarev (ORCID: https://orcid.org/0000-0002-9432-8992)
- Elena Kirillova
Institutions
- Russian Academy of Sciences (RU)
- Stockholm University (SE)
- Sakhalin State University (RU)
- Ulyanovsk State University (RU)
- National Research Tomsk State University (RU)
- Lomonosov Moscow State University (RU)
- Norwegian Institute for Water Research (NO)
- Tomsk Polytechnic University (RU)
- V.I. Il'ichev Pacific Oceanological Institute (RU)
- Bolin Centre for Climate Research (SE)
- University of Delaware (US)
- University of Gothenburg (SE)
Publication Details
- Journal
- Limnology and Oceanography Letters
- Published
- 2025-06-09
- DOI
- https://doi.org/10.1002/lol2.70039
- Primary Topic
- Methane Hydrates and Related Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Svenska Forskningsrådet Formas
- Vetenskapsrådet
- Norges Forskningsråd
- Russian Science Foundation
- Tomsk State University
- Ministry of Science and Higher Education of the Russian Federation