Articles | Volume 17, issue 10
https://doi.org/10.5194/bg-17-2745-2020
https://doi.org/10.5194/bg-17-2745-2020
Research article
 | 
24 May 2020
Research article |  | 24 May 2020

Removal of phosphorus and nitrogen in sediments of the eutrophic Stockholm archipelago, Baltic Sea

Niels A. G. M. van Helmond, Elizabeth K. Robertson, Daniel J. Conley, Martijn Hermans, Christoph Humborg, L. Joëlle Kubeneck, Wytze K. Lenstra, and Caroline P. Slomp

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Algar, C. K. and Vallino, J. J.: Predicting microbial nitrate reduction pathways in coastal sediments, Aquat. Microb. Ecol., 71, 223–238, https://doi.org/10.3354/ame01678, 2014. 
Algeo, T. J. and Ingall, E.: Sedimentary Corg: P ratios, paleocean ventilation, and Phanerozoic atmospheric pO2, Palaeogeogr. Palaeoecol., 256, 130–155, https://doi.org/10.1016/j.palaeo.2007.02.029, 2007. 
Almroth-Rosell, E., Edman, M., Eilola, K., Meier, H. E. M., and Sahlberg, J.: Modelling nutrient retention in the coastal zone of an eutrophic sea, Biogeosciences, 13, 5753–5769, https://doi.org/10.5194/bg-13-5753-2016, 2016. 
An, S. and Gardner, W. S.: Dissimilatory nitrate reduction to ammonium (DNRA) as a nitrogen link, versus denitrification as a sink in a shallow estuary (Laguna Madre/Baffin Bay, Texas), Mar. Ecol. Prog. Ser., 237, 41–50, https://doi.org/10.3354/meps237041, 2002. 
Anderson, D. M., Glibert, P. M., and Burkholder, J. M.: Harmful algal blooms and eutrophication: nutrient sources, composition, and consequences, Estuaries, 25, 704–726, https://doi.org/10.1007/BF02804901, 2002. 
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Short summary
We studied the removal of phosphorus (P) and nitrogen (N) in the eutrophic Stockholm archipelago (SA). High sedimentation rates and sediment P contents lead to high P burial. Benthic denitrification is the primary nitrate-reducing pathway. Together, these mechanisms limit P and N transport to the open Baltic Sea. We expect that further nutrient load reduction will contribute to recovery of the SA from low-oxygen conditions and that the sediments will continue to remove part of the P and N loads.
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