Articles | Volume 18, issue 9
https://doi.org/10.5194/bg-18-2981-2021
© Author(s) 2021. 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-18-2981-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
17 May 2021
Research article |
| 17 May 2021
| 17 May 2021
Deep-water inflow event increases sedimentary phosphorus release on a multi-year scale
Department of Marine Sciences, University of Gothenburg, Box 461, 405
30 Gothenburg, Sweden
Sebastiaan J. van de Velde
Department of Earth and Planetary Sciences, University of California,
Riverside, CA 92521, USA
Bgeosys, Geoscience, Environment & Society, Université Libre de
Bruxelles, 1050 Brussels, Belgium
Operational Directorate Natural Environment, Royal Belgian Institute
of Natural Sciences, 1000 Brussels, Belgium
Mikhail Kononets
Department of Marine Sciences, University of Gothenburg, Box 461, 405
30 Gothenburg, Sweden
Mingyue Luo
Department of Analytical, Environmental and Geo-Chemistry, Vrije
Universiteit Brussel, 1050 Brussels, Belgium
Elin Almroth-Rosell
Oceanographic Research, Swedish Meteorological and Hydrological
Institute, 426 71 Västra Frölunda, Sweden
Per O. J. Hall
Department of Marine Sciences, University of Gothenburg, Box 461, 405
30 Gothenburg, Sweden
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Coastal enhanced silicate weathering (CESW) with olivine is a promising method for capturing CO2 from the atmosphere, yet studies in field conditions are lacking. We bridge the gap between theoretical studies and the real-world environment by estimating the predictability of CESW parameters and identifying aspects to consider when applying CESW. A major source of uncertainty is the lack of experimental studies with sediment, which can heavily influence the speed and efficiency of CO2 drawdown.
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Coastal enhanced silicate weathering (CESW) with olivine is a promising method for capturing CO2 from the atmosphere, yet studies in field conditions are lacking. We bridge the gap between theoretical studies and the real-world environment by estimating the predictability of CESW parameters and identifying aspects to consider when applying CESW. A major source of uncertainty is the lack of experimental studies with sediment, which can heavily influence the speed and efficiency of CO2 drawdown.
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Biogeosciences, 21, 2087–2132, https://doi.org/10.5194/bg-21-2087-2024, https://doi.org/10.5194/bg-21-2087-2024, 2024
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The health of the Baltic and North seas is threatened due to high anthropogenic pressure; thus, different methods to assess the status of these regions are urgently needed. Here, we validated a novel model simulating the ocean dynamics and biogeochemistry of the Baltic and North seas that can be used to create future climate and nutrient scenarios, contribute to European initiatives on de-eutrophication, and provide water quality advice and support on nutrient load reductions for both seas.
Karol Kuliński, Gregor Rehder, Eero Asmala, Alena Bartosova, Jacob Carstensen, Bo Gustafsson, Per O. J. Hall, Christoph Humborg, Tom Jilbert, Klaus Jürgens, H. E. Markus Meier, Bärbel Müller-Karulis, Michael Naumann, Jørgen E. Olesen, Oleg Savchuk, Andreas Schramm, Caroline P. Slomp, Mikhail Sofiev, Anna Sobek, Beata Szymczycha, and Emma Undeman
Earth Syst. Dynam., 13, 633–685, https://doi.org/10.5194/esd-13-633-2022, https://doi.org/10.5194/esd-13-633-2022, 2022
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The paper covers the aspects related to changes in carbon, nitrogen, and phosphorus (C, N, P) external loads; their transformations in the coastal zone; changes in organic matter production (eutrophication) and remineralization (oxygen availability); and the role of sediments in burial and turnover of C, N, and P. Furthermore, this paper also focuses on changes in the marine CO2 system, the structure of the microbial community, and the role of contaminants for biogeochemical processes.
Jenny Hieronymus, Kari Eilola, Malin Olofsson, Inga Hense, H. E. Markus Meier, and Elin Almroth-Rosell
Biogeosciences, 18, 6213–6227, https://doi.org/10.5194/bg-18-6213-2021, https://doi.org/10.5194/bg-18-6213-2021, 2021
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Dense blooms of cyanobacteria occur every summer in the Baltic Proper and can add to eutrophication by their ability to turn nitrogen gas into dissolved inorganic nitrogen. Being able to correctly estimate the size of this nitrogen fixation is important for management purposes. In this work, we find that the life cycle of cyanobacteria plays an important role in capturing the seasonality of the blooms as well as the size of nitrogen fixation in our ocean model.
Sebastiaan J. van de Velde, Dominik Hülse, Christopher T. Reinhard, and Andy Ridgwell
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Biogeochemical interactions between iron and sulfur are central to the long-term biogeochemical evolution of Earth’s oceans. Here, we introduce an iron–sulphur cycle in a model of Earth's oceans. Our analyses show that the results of the model are robust towards parameter choices and that simulated concentrations and reactions are comparable to those observed in ancient ocean analogues (anoxic lakes). Our model represents an important step forward in the study of iron–sulfur cycling.
Sebastiaan J. van de Velde, Rebecca K. James, Ine Callebaut, Silvia Hidalgo-Martinez, and Filip J. R. Meysman
Biogeosciences, 18, 1451–1461, https://doi.org/10.5194/bg-18-1451-2021, https://doi.org/10.5194/bg-18-1451-2021, 2021
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Some 540 Myr ago, animal life evolved in the ocean. Previous research suggested that when these early animals started inhabiting the seafloor, they retained phosphorus in the seafloor, thereby limiting photosynthesis in the ocean. We studied salt marsh sediments with and without animals and found that their impact on phosphorus retention is limited, which implies that their impact on the global environment might have been less drastic than previously assumed.
Martin Schobben, Sebastiaan van de Velde, Jana Gliwa, Lucyna Leda, Dieter Korn, Ulrich Struck, Clemens Vinzenz Ullmann, Vachik Hairapetian, Abbas Ghaderi, Christoph Korte, Robert J. Newton, Simon W. Poulton, and Paul B. Wignall
Clim. Past, 13, 1635–1659, https://doi.org/10.5194/cp-13-1635-2017, https://doi.org/10.5194/cp-13-1635-2017, 2017
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Stratigraphic trends in the carbon isotope composition of calcium carbonate rock can be used as a stratigraphic tool. An important assumption when using these isotope chemical records is that they record a globally universal signal of marine water chemistry. We show that carbon isotope scatter on a confined centimetre stratigraphic scale appears to represent a signal of microbial activity. However, long-term carbon isotope trends are still compatible with a primary isotope imprint.
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Biogeosciences, 14, 285–300, https://doi.org/10.5194/bg-14-285-2017, https://doi.org/10.5194/bg-14-285-2017, 2017
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Understanding nitrogen (N) cycling mechanisms in the ocean is crucial for improving ecosystem management. Here we study N processes by in situ lander and isotope tracer techniques in – so far overlooked – sediments with low organic loads. Denitrification and anammox are the main N transformation processes. However, we demonstrate high contribution of dissimilatory nitrate reduction to ammonium, which recycles a major portion of fixed N to the water column and sustains primary production.
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Nutrients from land have been discussed to increase eutrophication in the open sea. This model study shows that the coastal zone works as an efficient filter. Water depth and residence time regulate the retention that occurs mostly in the sediment due to processes such as burial and denitrification. On shorter timescales the retention capacity might seem less effective when the land load of nutrients decreases, but with time the coastal zone can import nutrients from the open sea.
J. Friedrich, F. Janssen, D. Aleynik, H. W. Bange, N. Boltacheva, M. N. Çagatay, A. W. Dale, G. Etiope, Z. Erdem, M. Geraga, A. Gilli, M. T. Gomoiu, P. O. J. Hall, D. Hansson, Y. He, M. Holtappels, M. K. Kirf, M. Kononets, S. Konovalov, A. Lichtschlag, D. M. Livingstone, G. Marinaro, S. Mazlumyan, S. Naeher, R. P. North, G. Papatheodorou, O. Pfannkuche, R. Prien, G. Rehder, C. J. Schubert, T. Soltwedel, S. Sommer, H. Stahl, E. V. Stanev, A. Teaca, A. Tengberg, C. Waldmann, B. Wehrli, and F. Wenzhöfer
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Biogeosciences, 10, 3901–3916, https://doi.org/10.5194/bg-10-3901-2013, https://doi.org/10.5194/bg-10-3901-2013, 2013
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Marine hydrocarbon seeps typically host subsurface microorganisms capable of degrading methane before it is emitted to the water column. Here we describe a seep in Monterey Bay which virtually lacks known methanotrophs and where biological consumption of methane at depth is undetected. Our findings suggest that some seeps are missing this critical biofilter and that seeps may be a more significant source of methane to the water column than previously realized.
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Methane is a potent greenhouse gas, and hence it is important to understand its sources and sinks in the environment. Here we present new data from organic-rich surface sediments below an oxygen minimum zone off the coast of California (Santa Barbara Basin) demonstrating the simultaneous microbial production and consumption of methane, which appears to be an important process preventing the build-up of methane in these sediments and the emission into the water column and atmosphere.
Sinan Xu, Bo Liu, Sandra Arndt, Sabine Kasten, and Zijun Wu
Biogeosciences, 20, 2251–2263, https://doi.org/10.5194/bg-20-2251-2023, https://doi.org/10.5194/bg-20-2251-2023, 2023
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We use a reactive continuum model based on a lognormal distribution (l-RCM) to inversely determine model parameters μ and σ at 123 sites across the global ocean. Our results show organic matter (OM) reactivity is more than 3 orders of magnitude higher in shelf than in abyssal regions. In addition, OM reactivity is higher than predicted in some specific regions, yet the l-RCM can still capture OM reactivity features in these regions.
Christiane Schmidt, Emmanuelle Geslin, Joan M. Bernhard, Charlotte LeKieffre, Mette Marianne Svenning, Helene Roberge, Magali Schweizer, and Giuliana Panieri
Biogeosciences, 19, 3897–3909, https://doi.org/10.5194/bg-19-3897-2022, https://doi.org/10.5194/bg-19-3897-2022, 2022
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This study is the first to show non-selective deposit feeding in the foraminifera Nonionella labradorica and the possible uptake of methanotrophic bacteria. We carried out a feeding experiment with a marine methanotroph to examine the ultrastructure of the cell and degradation vacuoles using transmission electron microscopy (TEM). The results revealed three putative methanotrophs at the outside of the cell/test, which could be taken up via non-targeted grazing in seeps or our experiment.
James P. J. Ward, Katharine R. Hendry, Sandra Arndt, Johan C. Faust, Felipe S. Freitas, Sian F. Henley, Jeffrey W. Krause, Christian März, Allyson C. Tessin, and Ruth L. Airs
Biogeosciences, 19, 3445–3467, https://doi.org/10.5194/bg-19-3445-2022, https://doi.org/10.5194/bg-19-3445-2022, 2022
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The seafloor plays an important role in the cycling of silicon (Si), a key nutrient that promotes marine primary productivity. In our model study, we disentangle major controls on the seafloor Si cycle to better anticipate the impacts of continued warming and sea ice melt in the Barents Sea. We uncover a coupling of the iron redox and Si cycles, dissolution of lithogenic silicates, and authigenic clay formation, comprising a Si sink that could have implications for the Arctic Ocean Si budget.
Hanni Vigderovich, Werner Eckert, Michal Elul, Maxim Rubin-Blum, Marcus Elvert, and Orit Sivan
Biogeosciences, 19, 2313–2331, https://doi.org/10.5194/bg-19-2313-2022, https://doi.org/10.5194/bg-19-2313-2022, 2022
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Anaerobic oxidation of methane (AOM) is one of the major processes limiting the release of the greenhouse gas methane from natural environments. Here we show that significant AOM exists in the methane zone of lake sediments in natural conditions and even after long-term (ca. 18 months) anaerobic slurry incubations with two stages. Methanogens were most likely responsible for oxidizing the methane, and humic substances and iron oxides are likely electron acceptors to support this oxidation.
Bjorn Sundby, Pierre Anschutz, Pascal Lecroart, and Alfonso Mucci
Biogeosciences, 19, 1421–1434, https://doi.org/10.5194/bg-19-1421-2022, https://doi.org/10.5194/bg-19-1421-2022, 2022
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A glacial–interglacial methane-fuelled redistribution of reactive phosphorus between the oceanic and sedimentary phosphorus reservoirs can occur in the ocean when falling sea level lowers the pressure on the seafloor, destabilizes methane hydrates, and triggers the dissolution of P-bearing iron oxides. The mass of phosphate potentially mobilizable from the sediment is similar to the size of the current oceanic reservoir. Hence, this process may play a major role in the marine phosphorus cycle.
Florian Lauryssen, Philippe Crombé, Tom Maris, Elliot Van Maldegem, Marijn Van de Broek, Stijn Temmerman, and Erik Smolders
Biogeosciences, 19, 763–776, https://doi.org/10.5194/bg-19-763-2022, https://doi.org/10.5194/bg-19-763-2022, 2022
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Surface waters in lowland regions have a poor surface water quality, mainly due to excess nutrients like phosphate. Therefore, we wanted to know the phosphate levels without humans, also called the pre-industrial background. Phosphate binds strongly to sediment particles, suspended in the river water. In this research we used sediments deposited by a river as an archive for surface water phosphate back to 1800 CE. Pre-industrial phosphate levels were estimated at one-third of the modern levels.
Gerard J. M. Versteegh, Andrea Koschinsky, Thomas Kuhn, Inken Preuss, and Sabine Kasten
Biogeosciences, 18, 4965–4984, https://doi.org/10.5194/bg-18-4965-2021, https://doi.org/10.5194/bg-18-4965-2021, 2021
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Oxygen penetrates sediments not only from the ocean bottom waters but also from the basement. The impact of the latter is poorly understood. We show that this basement oxygen has a clear impact on the nitrogen cycle, the redox state, and the distribution of manganese, nickel cobalt and organic matter in the sediments. This is important for (1) global biogeochemical cycles, (2) understanding sedimentary life and (3) the interpretation of the sediment record to reconstruct the past.
Annika Fiskal, Eva Anthamatten, Longhui Deng, Xingguo Han, Lorenzo Lagostina, Anja Michel, Rong Zhu, Nathalie Dubois, Carsten J. Schubert, Stefano M. Bernasconi, and Mark A. Lever
Biogeosciences, 18, 4369–4388, https://doi.org/10.5194/bg-18-4369-2021, https://doi.org/10.5194/bg-18-4369-2021, 2021
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Microbially produced methane can serve as a carbon source for freshwater macrofauna most likely through grazing on methane-oxidizing bacteria. This study investigates the contributions of different carbon sources to macrofaunal biomass. Our data suggest that the average contribution of methane-derived carbon is similar between different fauna but overall remains low. This is further supported by the low abundance of methane-cycling microorganisms.
Sebastiaan J. van de Velde, Rebecca K. James, Ine Callebaut, Silvia Hidalgo-Martinez, and Filip J. R. Meysman
Biogeosciences, 18, 1451–1461, https://doi.org/10.5194/bg-18-1451-2021, https://doi.org/10.5194/bg-18-1451-2021, 2021
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Some 540 Myr ago, animal life evolved in the ocean. Previous research suggested that when these early animals started inhabiting the seafloor, they retained phosphorus in the seafloor, thereby limiting photosynthesis in the ocean. We studied salt marsh sediments with and without animals and found that their impact on phosphorus retention is limited, which implies that their impact on the global environment might have been less drastic than previously assumed.
Martijn Hermans, Nils Risgaard-Petersen, Filip J. R. Meysman, and Caroline P. Slomp
Biogeosciences, 17, 5919–5938, https://doi.org/10.5194/bg-17-5919-2020, https://doi.org/10.5194/bg-17-5919-2020, 2020
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This paper demonstrates that the recently discovered cable bacteria are capable of using a mineral, known as siderite, as a source for the formation of iron oxides. This work also demonstrates that the activity of cable bacteria can lead to a distinct subsurface layer in the sediment that can be used as a marker for their activity.
Torben Windirsch, Guido Grosse, Mathias Ulrich, Lutz Schirrmeister, Alexander N. Fedorov, Pavel Y. Konstantinov, Matthias Fuchs, Loeka L. Jongejans, Juliane Wolter, Thomas Opel, and Jens Strauss
Biogeosciences, 17, 3797–3814, https://doi.org/10.5194/bg-17-3797-2020, https://doi.org/10.5194/bg-17-3797-2020, 2020
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To extend the knowledge on circumpolar deep permafrost carbon storage, we examined two deep permafrost deposit types (Yedoma and alas) in central Yakutia. We found little but partially undecomposed organic carbon as a result of largely changing sedimentation processes. The carbon stock of the examined Yedoma deposits is about 50 % lower than the general Yedoma domain mean, implying a very hetererogeneous Yedoma composition, while the alas is approximately 80 % below the thermokarst deposit mean.
Anna Plass, Christian Schlosser, Stefan Sommer, Andrew W. Dale, Eric P. Achterberg, and Florian Scholz
Biogeosciences, 17, 3685–3704, https://doi.org/10.5194/bg-17-3685-2020, https://doi.org/10.5194/bg-17-3685-2020, 2020
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We compare the cycling of Fe and Cd in sulfidic sediments of the Peruvian oxygen minimum zone. Due to the contrasting solubility of their sulfide minerals, the sedimentary Fe release and Cd burial fluxes covary with spatial and temporal distributions of H2S. Depending on the solubility of their sulfide minerals, sedimentary trace metal fluxes will respond differently to ocean deoxygenation/expansion of H2S concentrations, which may change trace metal stoichiometry of upwelling water masses.
Biqing Zhu, Manuel Kübler, Melanie Ridoli, Daniel Breitenstein, and Martin H. Schroth
Biogeosciences, 17, 3613–3630, https://doi.org/10.5194/bg-17-3613-2020, https://doi.org/10.5194/bg-17-3613-2020, 2020
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We provide evidence that the greenhouse gas methane (CH4) is enclosed in calcareous glacier-forefield sediments across Switzerland. Geochemical analyses confirmed that this ancient CH4 has its origin in the calcareous parent bedrock. Our estimate of the total quantity of CH4 enclosed in sediments across Switzerland indicates a large CH4 mass (~105 t CH4). We produced evidence that CH4 is stable in its enclosed state, but additional experiments are needed to elucidate its long-term fate.
Matteo Puglini, Victor Brovkin, Pierre Regnier, and Sandra Arndt
Biogeosciences, 17, 3247–3275, https://doi.org/10.5194/bg-17-3247-2020, https://doi.org/10.5194/bg-17-3247-2020, 2020
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A reaction-transport model to assess the potential non-turbulent methane flux from the East Siberian Arctic sediments to water columns is applied here. We show that anaerobic oxidation of methane (AOM) is an efficient filter except for high values of sedimentation rate and advective flow, which enable considerable non-turbulent steady-state methane fluxes. Significant transient methane fluxes can also occur during the building-up phase of the AOM-performing biomass microbial community.
Kyle Delwiche, Junyao Gu, Harold Hemond, and Sarah P. Preheim
Biogeosciences, 17, 3135–3147, https://doi.org/10.5194/bg-17-3135-2020, https://doi.org/10.5194/bg-17-3135-2020, 2020
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In this study, we investigate whether bubbles transport sediments containing arsenic and cyanobacteria from the bottom to the top of a polluted lake. We measured arsenic and cyanobacteria from bubble traps in the lake and from an experimental bubble column in the laboratory. We found that bubble transport was not an important source of arsenic in the surface waters but that bubbles could transport enough cyanobacteria to the surface to exacerbate harmful algal blooms.
Nathaniel Kemnitz, William M. Berelson, Douglas E. Hammond, Laura Morine, Maria Figueroa, Timothy W. Lyons, Simon Scharf, Nick Rollins, Elizabeth Petsios, Sydnie Lemieux, and Tina Treude
Biogeosciences, 17, 2381–2396, https://doi.org/10.5194/bg-17-2381-2020, https://doi.org/10.5194/bg-17-2381-2020, 2020
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Our paper shows how sedimentation in a very low oxygen setting provides a unique record of environmental change. We look at the past 250 years through the filter of sediment accumulation via radioisotope dating and other physical and chemical analyses of these sediments. We conclude, remarkably, that there has been very little change in net sediment mass accumulation through the past 100–150 years, yet just prior to 1900 CE, sediments were accumulating at 50 %–70 % of today's rate.
Dario Fussmann, Avril Jean Elisabeth von Hoyningen-Huene, Andreas Reimer, Dominik Schneider, Hana Babková, Robert Peticzka, Andreas Maier, Gernot Arp, Rolf Daniel, and Patrick Meister
Biogeosciences, 17, 2085–2106, https://doi.org/10.5194/bg-17-2085-2020, https://doi.org/10.5194/bg-17-2085-2020, 2020
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Dolomite (CaMg(CO3)2) is supersaturated in many aquatic settings (e.g., seawater) on modern Earth but does not precipitate directly from the fluid, a fact known as the dolomite problem. The widely acknowledged concept of dolomite precipitation involves microbial extracellular polymeric substances (EPSs) and anoxic conditions as important drivers. In contrast, results from Lake Neusiedl support an alternative concept of Ca–Mg carbonate precipitation under aerobic and alkaline conditions.
Aurèle Vuillemin, André Friese, Richard Wirth, Jan A. Schuessler, Anja M. Schleicher, Helga Kemnitz, Andreas Lücke, Kohen W. Bauer, Sulung Nomosatryo, Friedhelm von Blanckenburg, Rachel Simister, Luis G. Ordoñez, Daniel Ariztegui, Cynthia Henny, James M. Russell, Satria Bijaksana, Hendrik Vogel, Sean A. Crowe, Jens Kallmeyer, and the Towuti Drilling Project
Science team
Biogeosciences, 17, 1955–1973, https://doi.org/10.5194/bg-17-1955-2020, https://doi.org/10.5194/bg-17-1955-2020, 2020
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Ferruginous lakes experience restricted primary production due to phosphorus trapping by ferric iron oxides under oxic conditions. We report the presence of large crystals of vivianite, a ferrous iron phosphate, in sediments from Lake Towuti, Indonesia. We address processes of P retention linked to diagenesis of iron phases. Vivianite crystals had light Fe2+ isotope signatures and contained mineral inclusions consistent with antecedent processes of microbial sulfate and iron reduction.
Sonja Geilert, Patricia Grasse, Kristin Doering, Klaus Wallmann, Claudia Ehlert, Florian Scholz, Martin Frank, Mark Schmidt, and Christian Hensen
Biogeosciences, 17, 1745–1763, https://doi.org/10.5194/bg-17-1745-2020, https://doi.org/10.5194/bg-17-1745-2020, 2020
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Marine silicate weathering is a key process of the marine silica cycle; however, its controlling processes are not well understood. In the Guaymas Basin, silicate weathering has been studied under markedly differing ambient conditions. Environmental settings like redox conditions or terrigenous input of reactive silicates appear to be major factors controlling marine silicate weathering. These factors need to be taken into account in future oceanic mass balances of Si and in modeling studies.
Jessica B. Volz, Laura Haffert, Matthias Haeckel, Andrea Koschinsky, and Sabine Kasten
Biogeosciences, 17, 1113–1131, https://doi.org/10.5194/bg-17-1113-2020, https://doi.org/10.5194/bg-17-1113-2020, 2020
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Potential future deep-sea mining of polymetallic nodules at the seafloor is expected to severely harm the marine environment. However, the consequences on deep-sea ecosystems are still poorly understood. This study on surface sediments from man-made disturbance tracks in the Pacific Ocean shows that due to the removal of the uppermost sediment layer and thereby the loss of organic matter, the geochemical system in the sediments is disturbed for millennia before reaching a new equilibrium.
Ralf Conrad, Melanie Klose, and Alex Enrich-Prast
Biogeosciences, 17, 1063–1069, https://doi.org/10.5194/bg-17-1063-2020, https://doi.org/10.5194/bg-17-1063-2020, 2020
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Lake sediments release the greenhouse gas CH4. Acetate is an important precursor. Although Amazonian lake sediments all contained acetate-consuming methanogens, measurement of the turnover of labeled acetate showed that some sediments converted acetate not to CH4 plus CO2, as expected, but only to CO2. Our results indicate the operation of acetate-oxidizing microorganisms couples the oxidation process to syntrophic methanogenic partners and/or to the reduction of organic compounds.
Jens Rassmann, Eryn M. Eitel, Bruno Lansard, Cécile Cathalot, Christophe Brandily, Martial Taillefert, and Christophe Rabouille
Biogeosciences, 17, 13–33, https://doi.org/10.5194/bg-17-13-2020, https://doi.org/10.5194/bg-17-13-2020, 2020
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In this paper, we use a large set of measurements made using in situ and lab techniques to elucidate the cause of dissolved inorganic carbon fluxes in sediments from the Rhône delta and its companion compound alkalinity, which carries the absorption capacity of coastal waters with respect to atmospheric CO2. We show that sediment processes (sulfate reduction, FeS precipitation and accumulation) are crucial in generating the alkalinity fluxes observed in this study by in situ incubation chambers.
Sophie A. L. Paul, Matthias Haeckel, Michael Bau, Rajina Bajracharya, and Andrea Koschinsky
Biogeosciences, 16, 4829–4849, https://doi.org/10.5194/bg-16-4829-2019, https://doi.org/10.5194/bg-16-4829-2019, 2019
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We studied the upper 10 m of deep-sea sediments, including pore water, in the Peru Basin to understand small-scale variability of trace metals. Our results show high spatial variability related to topographical variations, which in turn impact organic matter contents, degradation processes, and trace metal cycling. Another interesting finding was the influence of dissolving buried nodules on the surrounding sediment and trace metal cycling.
Sarah Paradis, Antonio Pusceddu, Pere Masqué, Pere Puig, Davide Moccia, Tommaso Russo, and Claudio Lo Iacono
Biogeosciences, 16, 4307–4320, https://doi.org/10.5194/bg-16-4307-2019, https://doi.org/10.5194/bg-16-4307-2019, 2019
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Chronic deep bottom trawling in the Gulf of Castellammare (SW Mediterranean) erodes large volumes of sediment, exposing over-century-old sediment depleted in organic matter. Nevertheless, the arrival of fresh and nutritious sediment recovers superficial organic matter in trawling grounds and leads to high turnover rates, partially and temporarily mitigating the impacts of bottom trawling. However, this deposition is ephemeral and it will be swiftly eroded by the passage of the next trawler.
Zhichao Zhou, Bo Liang, Li-Ying Wang, Jin-Feng Liu, Bo-Zhong Mu, Hojae Shim, and Ji-Dong Gu
Biogeosciences, 16, 4229–4241, https://doi.org/10.5194/bg-16-4229-2019, https://doi.org/10.5194/bg-16-4229-2019, 2019
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This study shows a core bacterial microbiome with a small proportion of shared operational taxonomic units of common sequences among all oil reservoirs. Dominant methanogenesis shifts from the hydrogenotrophic pathway in water phase to the acetoclastic pathway in the oil phase at high temperatures, but the opposite is true at low temperatures. There are also major functional metabolism differences between the two phases for amino acids, hydrocarbons, and carbohydrates.
Annika Fiskal, Longhui Deng, Anja Michel, Philip Eickenbusch, Xingguo Han, Lorenzo Lagostina, Rong Zhu, Michael Sander, Martin H. Schroth, Stefano M. Bernasconi, Nathalie Dubois, and Mark A. Lever
Biogeosciences, 16, 3725–3746, https://doi.org/10.5194/bg-16-3725-2019, https://doi.org/10.5194/bg-16-3725-2019, 2019
Hanni Vigderovich, Lewen Liang, Barak Herut, Fengping Wang, Eyal Wurgaft, Maxim Rubin-Blum, and Orit Sivan
Biogeosciences, 16, 3165–3181, https://doi.org/10.5194/bg-16-3165-2019, https://doi.org/10.5194/bg-16-3165-2019, 2019
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Microbial iron reduction participates in important biogeochemical cycles. In the last decade iron reduction has been observed in many aquatic sediments below its classical zone, in the methane production zone, suggesting a link between the two cycles. Here we present evidence for microbial iron reduction in the methanogenic depth of the oligotrophic SE Mediterranean continental shelf using mainly geochemical and microbial sedimentary profiles and suggest possible mechanisms for this process.
Haoyi Yao, Wei-Li Hong, Giuliana Panieri, Simone Sauer, Marta E. Torres, Moritz F. Lehmann, Friederike Gründger, and Helge Niemann
Biogeosciences, 16, 2221–2232, https://doi.org/10.5194/bg-16-2221-2019, https://doi.org/10.5194/bg-16-2221-2019, 2019
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How methane is transported in the sediment is important for the microbial community living on methane. Here we report an observation of a mini-fracture that facilitates the advective gas transport of methane in the sediment, compared to the diffusive fluid transport without a fracture. We found contrasting bio-geochemical signals in these different transport modes. This finding can help to fill the gap in the fracture network system in modulating methane dynamics in surface sediments.
Laura A. Casella, Sixin He, Erika Griesshaber, Lourdes Fernández-Díaz, Martina Greiner, Elizabeth M. Harper, Daniel J. Jackson, Andreas Ziegler, Vasileios Mavromatis, Martin Dietzel, Anton Eisenhauer, Sabino Veintemillas-Verdaguer, Uwe Brand, and Wolfgang W. Schmahl
Biogeosciences, 15, 7451–7484, https://doi.org/10.5194/bg-15-7451-2018, https://doi.org/10.5194/bg-15-7451-2018, 2018
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Biogenic carbonates record past environmental conditions. Fossil shell chemistry and microstructure change as metastable biogenic carbonates are replaced by inorganic calcite. Simulated diagenetic alteration at 175 °C of different shell microstructures showed that (nacreous) shell aragonite and calcite were partially replaced by coarse inorganic calcite crystals due to dissolution–reprecipitation reactions. EBSD maps allowed for qualitative assessment of the degree of diagenetic overprint.
Wytze K. Lenstra, Matthias Egger, Niels A. G. M. van Helmond, Emma Kritzberg, Daniel J. Conley, and Caroline P. Slomp
Biogeosciences, 15, 6979–6996, https://doi.org/10.5194/bg-15-6979-2018, https://doi.org/10.5194/bg-15-6979-2018, 2018
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We show that burial rates of phosphorus (P) in an estuary in the northern Baltic Sea are very high. We demonstrate that at high sedimentation rates, P retention in the sediment is related to the formation of vivianite. With a reactive transport model, we assess the sensitivity of sedimentary vivianite formation. We suggest that enrichments of iron and P in the sediment are linked to periods of enhanced riverine input of Fe, which subsequently strongly enhances P burial in coastal sediments.
Jiarui Liu, Gareth Izon, Jiasheng Wang, Gilad Antler, Zhou Wang, Jie Zhao, and Matthias Egger
Biogeosciences, 15, 6329–6348, https://doi.org/10.5194/bg-15-6329-2018, https://doi.org/10.5194/bg-15-6329-2018, 2018
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Our work provides new insights into the biogeochemical cycling of iron, methane and phosphorus. We found that vivianite, an iron-phosphate mineral, is pervasive in methane-rich sediments, suggesting that iron reduction at depth is coupled to phosphorus and methane cycling on a much greater spatial scale than previously assumed. Acting as an important burial mechanism for iron and phosphorus, vivianite authigenesis may be an under-considered process in both modern and ancient settings alike.
Marc A. Besseling, Ellen C. Hopmans, R. Christine Boschman, Jaap S. Sinninghe Damsté, and Laura Villanueva
Biogeosciences, 15, 4047–4064, https://doi.org/10.5194/bg-15-4047-2018, https://doi.org/10.5194/bg-15-4047-2018, 2018
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Benthic archaea comprise a significant part of the total prokaryotic biomass in marine sediments. Here, we compared the archaeal diversity and intact polar lipid (IPL) composition in both surface and subsurface sediments with different oxygen regimes in the Arabian Sea oxygen minimum zone. The oxygenated sediments were dominated by Thaumarchaeota and IPL-GDGT-0. The anoxic sediment contained highly diverse archaeal communities and high relative abundances of IPL-GDGT-1 to -4.
Georgina Robinson, Thomas MacTavish, Candida Savage, Gary S. Caldwell, Clifford L. W. Jones, Trevor Probyn, Bradley D. Eyre, and Selina M. Stead
Biogeosciences, 15, 1863–1878, https://doi.org/10.5194/bg-15-1863-2018, https://doi.org/10.5194/bg-15-1863-2018, 2018
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This study examined the effect of adding carbon to a sediment-based effluent treatment system to treat nitrogen-rich aquaculture waste. The research was conducted in incubation chambers to measure the exchange of gases and nutrients across the sediment–water interface and examine changes in the sediment microbial community. Adding carbon increased the amount of nitrogen retained in the treatment system, thereby reducing the levels of nitrogen needing to be discharged to the environment.
Daniele Brigolin, Christophe Rabouille, Bruno Bombled, Silvia Colla, Salvatrice Vizzini, Roberto Pastres, and Fabio Pranovi
Biogeosciences, 15, 1347–1366, https://doi.org/10.5194/bg-15-1347-2018, https://doi.org/10.5194/bg-15-1347-2018, 2018
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We present the result of a study carried out in the north-western Adriatic Sea by combining two different types of models with field sampling. A mussel farm was taken as a local source of perturbation to the natural flux of particulate organic carbon to the sediment. Differences in fluxes were primarily associated with mussel physiological conditions. Although restricted, these changes in particulate organic carbon fluxes induced visible effects on sediment biogeochemistry.
Volker Brüchert, Lisa Bröder, Joanna E. Sawicka, Tommaso Tesi, Samantha P. Joye, Xiaole Sun, Igor P. Semiletov, and Vladimir A. Samarkin
Biogeosciences, 15, 471–490, https://doi.org/10.5194/bg-15-471-2018, https://doi.org/10.5194/bg-15-471-2018, 2018
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We determined the aerobic and anaerobic degradation rates of land- and marine-derived organic material in East Siberian shelf sediment. Marine plankton-derived organic carbon was the main source for the oxic dissolved carbon dioxide production, whereas terrestrial organic material significantly contributed to the production of carbon dioxide under anoxic conditions. Our direct degradation rate measurements provide new constraints for the present-day Arctic marine carbon budget.
Jack J. Middelburg
Biogeosciences, 15, 413–427, https://doi.org/10.5194/bg-15-413-2018, https://doi.org/10.5194/bg-15-413-2018, 2018
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Organic carbon processing at the seafloor is studied by geologists to better understand the sedimentary record, by biogeochemists to quantify burial and respiration, by organic geochemists to elucidate compositional changes, and by ecologists to follow carbon transfers within food webs. These disciplinary approaches have their strengths and weaknesses. This award talk provides a synthesis, highlights the role of animals in sediment carbon processing and presents some new concepts.
Craig Smeaton, William E. N. Austin, Althea L. Davies, Agnes Baltzer, John A. Howe, and John M. Baxter
Biogeosciences, 14, 5663–5674, https://doi.org/10.5194/bg-14-5663-2017, https://doi.org/10.5194/bg-14-5663-2017, 2017
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Fjord sediments are recognised as hotspots for the burial and long-term storage of carbon. In this study, we use the Scottish fjords as a natural laboratory. Using geophysical and geochemical analysis in combination with upscaling techniques, we have generated the first full national sedimentary C inventory for a fjordic system. The results indicate that the Scottish fjords on a like-for-like basis are more effective as C stores than their terrestrial counterparts, including Scottish peatlands.
Perran Louis Miall Cook, Adam John Kessler, and Bradley David Eyre
Biogeosciences, 14, 4061–4069, https://doi.org/10.5194/bg-14-4061-2017, https://doi.org/10.5194/bg-14-4061-2017, 2017
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Nitrogen is the key nutrient that typically limits productivity in coastal waters. One of the key controls on the amount of bioavailable nitrogen is the process of denitrification, which converts nitrate (bioavailable) into nitrogen gas. Previous studies suggest high rates of denitrification may take place within carbonate sediments, and one explanation for this is that this process may take place within the sand grains. Here we show evidence to support this hypothesis.
Chris T. Parsons, Fereidoun Rezanezhad, David W. O'Connell, and Philippe Van Cappellen
Biogeosciences, 14, 3585–3602, https://doi.org/10.5194/bg-14-3585-2017, https://doi.org/10.5194/bg-14-3585-2017, 2017
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Phosphorus (P) has accumulated in sediments due to past human activities. The re-release of this P to water contributes to the growth of harmful algal blooms. Our research improves our mechanistic understanding of how P is partitioned between different chemical forms and between sediment and water under dynamic conditions. We demonstrate that P trapped within iron minerals may be less mobile during anoxic conditions than previously thought due to reversible changes to P forms within sediment.
Clint M. Miller, Gerald R. Dickens, Martin Jakobsson, Carina Johansson, Andrey Koshurnikov, Matt O'Regan, Francesco Muschitiello, Christian Stranne, and Carl-Magnus Mörth
Biogeosciences, 14, 2929–2953, https://doi.org/10.5194/bg-14-2929-2017, https://doi.org/10.5194/bg-14-2929-2017, 2017
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Continental slopes north of the East Siberian Sea are assumed to hold large amounts of methane. We present pore water chemistry from the 2014 SWERUS-C3 expedition. These are among the first results generated from this vast climatically sensitive region, and they imply that abundant methane, including gas hydrates, do not characterize the East Siberian Sea slope or rise. This contradicts previous modeling and discussions, which due to the lack of data are almost entirely based assumption.
Laura A. Casella, Erika Griesshaber, Xiaofei Yin, Andreas Ziegler, Vasileios Mavromatis, Dirk Müller, Ann-Christine Ritter, Dorothee Hippler, Elizabeth M. Harper, Martin Dietzel, Adrian Immenhauser, Bernd R. Schöne, Lucia Angiolini, and Wolfgang W. Schmahl
Biogeosciences, 14, 1461–1492, https://doi.org/10.5194/bg-14-1461-2017, https://doi.org/10.5194/bg-14-1461-2017, 2017
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Mollusc shells record past environments. Fossil shell chemistry and microstructure change as metastable biogenic aragonite transforms to stable geogenic calcite. We simulated this alteration of Arctica islandica shells by hydrothermal treatments. Below 175 °C the shell aragonite survived for weeks. At 175 °C the replacement of the original material starts after 4 days and yields submillimetre-sized calcites preserving the macroscopic morphology as well as the original internal micromorphology.
Jung-Ho Hyun, Sung-Han Kim, Jin-Sook Mok, Hyeyoun Cho, Tongsup Lee, Verona Vandieken, and Bo Thamdrup
Biogeosciences, 14, 941–958, https://doi.org/10.5194/bg-14-941-2017, https://doi.org/10.5194/bg-14-941-2017, 2017
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The surface sediments of the Ulleung Basin (UB) in the East Sea are characterized by high organic carbon contents (> 2.5 %, dry wt.) and very high concentrations of Mn oxides (> 200 μmol cm−3) and Fe oxides (up to 100 μmol cm−3). For the first time in deep offshore sediments on the Asian margin with water depth over 2000 m, we report that Mn reduction and Fe reduction were the dominant organic carbon (Corg) oxidation pathways, comprising 45 % and 20 % of total Corg oxidation, respectively.
Cited articles
Almroth-Rosell, E., Eilola, K., Kuznetsov, I., Hall, P. O. J., and Meier, H.
E. M.: A new approach to model oxygen dependent benthic phosphate fluxes in
the baltic sea, J. Marine Syst., 144, 127–141,
https://doi.org/10.1016/j.jmarsys.2014.11.007, 2015.
Altieri, A. H. and Gedan, K. B.: Climate change and dead zones,
Global Change Biol., 21, 1395–1406, https://doi.org/10.1111/gcb.12754, 2015.
Aminot, A., Kérouel, R., and Coverly, S. C.: Nutrients in
seawater using segmented flow analysis, in: Practical Guidelines for the
Analysis of Seawater, edited by: Wurl, O., CRC Press, Boca Raton, Florida, USA, 144–177, 2009.
Arndt, S., Jørgensen, B. B., LaRowe, D. E., Middelburg, J. J., Pancost,
R. D., and Regnier, P. A. G.: Quantifying the degradation of organic matter
in marine sediments: A review and synthesis, Earth-Sci. Rev., 123,
53–86, https://doi.org/10.1016/j.earscirev.2013.02.008, 2013.
Arnosti, C., Jorgensen, B. B., Sagemann, J., and Thamdrup, B.: Temperature
dependence of microbial degradation of organic matter in marine sediments:
polysaccharide hydrolysis, oxygen consumption, and sulfate reduction, Mar.
Ecol. Prog. Ser., 165, 59–70, 1998.
Berelson, W. M., McManus, J., Coale, K. H., Johnson, K. S., Burdige, D. J.,
Kilgore, T. E., Colodner, D., Chavez, F. P., Kudela, R., and Boucher, J.: A
time series of benthic flux measurements from Monterey Bay, CA,
Cont. Shelf Res., 23, 457–481, https://doi.org/10.1016/S0278-4343(03)00009-8, 2003.
Bianchi, T. S.: The role of terrestrially derived organic carbon in the
coastal ocean: A changing paradigm and the priming effect, P. Natl. Acad. Sci. USA, 108, 19473–19481, https://doi.org/10.1073/pnas.1017982108, 2011.
Bianchi, T. S., Cui, X., Blair, N. E., Burdige, D. J., Eglinton, T. I., and
Galy, V.: Centers of organic carbon burial and oxidation at the land-ocean
interface, Org. Geochem., 115, 138–155, https://doi.org/10.1016/j.orggeochem.2017.09.008, 2018.
Bidle, K. D. and Azam, F.: Accelerated dissolution of diatom silica by
marine bacterial assemblages, Nature, 397, 508–512,
https://doi.org/10.1038/17351, 1999.
Blomqvist, S., Ekeroth, N., Elmgren, R., and Hall, P. O. J.: Long overdue
improvement of box corer sampling, Mar. Ecol. Prog. Ser., 538, 13–21,
https://doi.org/10.3354/meps11405, 2015.
Boudreau, B. P.: Diagenetic models and their implementation: modelling
transport and reactions in aquatic sediments, Springer, New York, 414 pp., 1997.
Breitburg, D. L., Levin, L. A., Oschlies, A., Grégoire, M., Chavez, F.
P., Conley, D. J., Garçon, V., Gilbert, D., Gutiérrez, D., Isensee,
K., Jacinto, G. S., Limburg, K. E., Montes, I., Naqvi, S. W. A., Pitcher, G.
C., Rabalais, N. N., Roman, M. R., Rose, K. A., Seibel, B. A., Telszewski,
M., Yasuhara, M., and Zhang, J.: Declining oxygen in the global ocean and
coastal waters, Science, 359, eaam7240, https://doi.org/10.1126/science.aam7240, 2018.
Broman, E., Bonaglia, S., Holovachov, O., Marzocchi, U., Hall, P. O. J., and
Nascimento, F. J. A.: Uncovering diversity and metabolic spectrum of animals
in dead zone sediments, Commun. Biol., 3, 106,
https://doi.org/10.1038/s42003-020-0822-7, 2020.
Carstensen, J., Andersen, J. H., Gustafsson, B. G., and Conley, D. J.:
Deoxygenation of the Baltic Sea during the last century,
P. Natl. Acad. Sci. USA, 111, 5628–5633, https://doi.org/10.1073/pnas.1323156111, 2014.
Christiansen, C., Edelvang, K., Emeis, K. C., Graf, G., Jähmlich, S.,
Kozuch, J., Laima, M., Leipe, T., Löffler, A., Lund-Hansen, L. C.,
Miltner, A., Pazdro, K., Pempkowiak, J., Shimmield, G., Shimmield, T.,
Smith, J., Voss, M., and Witt, G.: Material transport from the nearshore to
the basinal environment in the southern Baltic Sea I, Processes and mass
estimates, J. Marine Syst., 35, 133–150,
https://doi.org/10.1016/S0924-7963(02)00126-4, 2002.
Cisternas-Novoa, C., Le Moigne, F. A. C., and Engel, A.: Composition and vertical flux of particulate organic matter to the oxygen minimum zone of the central Baltic Sea: impact of a sporadic North Sea inflow, Biogeosciences, 16, 927–947, https://doi.org/10.5194/bg-16-927-2019, 2019.
Danielsson, Å., Jönsson, A., and Rahm, L.: Resuspension patterns in
the Baltic proper, J. Sea Res., 57, 257–269,
https://doi.org/10.1016/j.seares.2006.07.005, 2007.
de Mendibur, F.: agricolae: Statistical Procedures for Agricultural
Research, R package version 1.3-3, available at: https://CRAN.R-project.org/package=agricolae (last access: 23 March 2021), 2020.
Dellwig, O., Leipe, T., Ma, C., Glockzin, M., Pollehne, F., Schnetger, B.,
Yakushev, E. V., and Bo, M. E.: A new particulate Mn-Fe-P-shuttle at the
redoxcline of anoxic basins, Geochim. Cosmochim. Ac., 74, 7100–7115,
https://doi.org/10.1016/j.gca.2010.09.017, 2010.
Dellwig, O., Schnetger, B., Meyer, D., Pollehne, F., Häusler, K., and
Arz, H. W.: Impact of the Major Baltic Inflow in 2014 on Manganese Cycling
in the Gotland Deep (Baltic Sea), Front. Mar. Sci., 5, 248,
https://doi.org/10.3389/fmars.2018.00248, 2018.
Diaz, R. J. and Rosenberg, R.: Spreading Dead Zones and Consequences for
Marine Ecosystems, Science, 321, 926–929, https://doi.org/10.1126/science.1156401, 2008.
Ekeroth, N., Blomqvist, S., and Hall, P. O. J.: Nutrient fluxes from reduced
Baltic Sea sediment: effects of oxygenation and macrobenthos, Mar. Ecol.
Prog. Ser., 544, 77–92, https://doi.org/10.3354/meps11592, 2016.
Glud, R. N., Berg, P., Fossing, H., and Jørgensen, B. B.: Effect of the
diffusive boundary layer on benthic mineralization and O2 distribution: A theoretical model analysis, Limnol. Oceanogr., 52, 547–557,
https://doi.org/10.4319/lo.2007.52.2.0547, 2007.
Gunnars, A., Blomqvist, S., Johansson, P., and Andersson, C.: Formation of Fe(III) oxyhydroxide colloids in freshwater and brackish seawater, with
incorporation of phosphate and calcium, Geochim. Cosmochim. Ac., 66,
745–758, 2002.
Hagen, E. and Feistel, R.: Observations of low-frequency current
fluctuations in deep water of the Eastern Gotland Basin/Baltic Sea,
J. Geophys. Res.-Oceans, 109, C03044, https://doi.org/10.1029/2003jc002017, 2004.
Hall, P. O. J., Anderson, L. G., van der Loeff, M. M. R., Sundby, B., and
Westerlund, S. F. G.: Oxygen uptake kinetics in the benthic boundary layer,
Limnol. Oceanogr., 34, 734–746, https://doi.org/10.4319/lo.1989.34.4.0734, 1989.
Hall, P. O. J., Almroth-Rosell, E., Bonaglia, S., Dale, A. W., Hylén,
A., Kononets, M. Y., Nilsson, M. M., Sommer, S., van de Velde, S. J., and
Viktorsson, L.: Influence of Natural Oxygenation of Baltic Proper Deep Water
on Benthic Recycling and Removal of Phosphorus, Nitrogen, Silicon and
Carbon, Front. Mar. Sci., 4, 27, https://doi.org/10.3389/fmars.2017.00027, 2017.
Hermans, M., Lenstra, W. K., Hidalgo-Martinez, S., van Helmond, N. A. G. M.,
Witbaard, R., Meysman, F. J. R., Gonzalez, S., and Slomp, C. P.: Abundance
and Biogeochemical Impact of Cable Bacteria in Baltic Sea Sediments,
Environ. Sci. Technol., 53, 7494–7503, https://doi.org/10.1021/acs.est.9b01665, 2019a.
Hermans, M., Lenstra, W. K., van Helmond, N. A. G. M., Behrends, T., Egger,
M., Séguret, M. J. M., Gustafsson, E., Gustafsson, B. G., and Slomp, C.
P.: Impact of natural re-oxygenation on the sediment dynamics of manganese,
iron and phosphorus in a euxinic Baltic Sea basin, Geochim. Cosmochim. Ac.,
246, 174–196, https://doi.org/10.1126/science.1105959, 2019b.
Hulthe, G., Hulth, S., and Hall, P. O. J.: Effect of oxygen on degradation
rate of refractory and labile organic matter in continental margin
sediments, Geochim. Cosmochim. Ac., 62, 1319–1328, 1998.
Hylén, A., van de Velde, S. J., Kononets, M., Luo, M., Almroth-Rosell, E., and Hall, P. O. J.: Benthic fluxes and sediment properties in the Eastern Gotland Basin, Baltic Sea, following a major Baltic inflow, Marine Data Archive [data set], https://doi.org/10.14284/442, 2021.
Jilbert, T. and Slomp, C. P.: Iron and manganese shuttles control the
formation of authigenic phosphorus minerals in the euxinic basins of the
Baltic Sea, Geochim. Cosmochim. Ac., 107, 155–169,
https://doi.org/10.1016/j.gca.2013.01.005, 2013.
Jilbert, T., Slomp, C. P., Gustafsson, B. G., and Boer, W.: Beyond the Fe-P-redox connection: preferential regeneration of phosphorus from organic matter as a key control on Baltic Sea nutrient cycles, Biogeosciences, 8, 1699–1720, https://doi.org/10.5194/bg-8-1699-2011, 2011.
Johansen, M. and Skjevik, A.-T.: Algal situation in marine waters
surrounding Sweden, no. 8-11, available at:
https://www.smhi.se/publikationer/publikationer/algrapporter (last access: 18 January 2021), 2017.
Jonsson, P., Carman, R., and Wulff, F.: Laminated Sediments in the Baltic: A
Tool for Evaluating Nutrient Mass Balances, Ambio, 19, 152–158, 1990.
Kononets, M. Y., Tengberg, A., Nilsson, M. M., Ekeroth, N., Hylén, A.,
van de Velde, S. J., Rütting, T., Bonaglia, S., Blomqvist, S., and Hall,
P. O. J.: In situ incubations with Gothenburg benthic chamber landers:
Applications and quality control, J. Marine Syst., 214, 103475,
https://doi.org/10.1016/j.jmarsys.2020.103475, 2021.
Koreleff, F.: Determination of nutrients, in: Methods of seawater analysis,
edited by: Grasshoff, K., Ehrhardt, M., and Kremling, K., Verlag Chemie, Weinheim, Germany, 125–187, 1983.
Kraal, P., Dijkstra, N., Behrends, T., and Slomp, C. P.: Phosphorus burial in
sediments of the sulfidic deep Black Sea: Key roles for adsorption by
calcium carbonate and apatite authigenesis, Geochim. Cosmochim. Ac., 204,
140–158, https://doi.org/10.1016/j.gca.2017.01.042, 2017.
LaRowe, D. E., Arndt, S., Bradley, J. A., Estes, E. R., Hoarfrost, A., Lang,
S. Q., Lloyd, K. G., Mahmoudi, N., Orsi, W. D., Shah Walter, S. R., Steen,
A. D., and Zhao, R.: The fate of organic carbon in marine sediments – New
insights from recent data and analysis, Earth-Sci. Rev., 204, 103146, https://doi.org/10.1016/j.earscirev.2020.103146, 2020.
Le Moigne, F. A. C., Cisternas-Novoa, C., Piontek, J., Maßmig, M., and
Engel, A.: On the effect of low oxygen concentrations on bacterial
degradation of sinking particles, Sci. Rep.-UK, 7, 16722,
https://doi.org/10.1038/s41598-017-16903-3, 2017.
Leipe, T., Tauber, F., Vallius, H., Virtasalo, J. J., Uścinowicz, S.,
Kowalski, N., Hille, S., Lindgren, S., and Myllyvirta, T.: Particulate
organic carbon (POC) in surface sediments of the Baltic Sea,
Geo-Mar. Lett., 31, 175–188, https://doi.org/10.1007/s00367-010-0223-x, 2011.
Liblik, T., Naumann, M., Alenius, P., Hansson, M., Lips, U., Nausch, G.,
Tuomi, L., Wesslander, K., Laanemets, J., and Viktorsson, L.: Propagation of
impact of the recent Major Baltic Inflows from the Eastern Gotland Basin to
the Gulf of Finland, Front. Mar. Sci., 5, 222,
https://doi.org/10.3389/fmars.2018.00222, 2018.
Marzocchi, U., Bonaglia, S., van de Velde, S. J., Hall, P. O. J., Schramm,
A., Risgaard-Petersen, N., and Meysman, F. J. R.: Transient bottom water
oxygenation creates a niche for cable bacteria in long-term anoxic sediments
of the Eastern Gotland Basin, Environ. Microbiol., 20, 3031–3041,
https://doi.org/10.1111/1462-2920.14349, 2018.
Middelburg, J. J. and Levin, L. A.: Coastal hypoxia and sediment biogeochemistry, Biogeosciences, 6, 1273–1293, https://doi.org/10.5194/bg-6-1273-2009, 2009.
Nilsson, M. M., Kononets, M. Y., Ekeroth, N., Viktorsson, L., Hylén, A.,
Sommer, S., Pfannkuche, O., Almroth-Rosell, E., Atamanchuk, D., Andersson,
H. J., Roos, P., Tengberg, A., and Hall, P. O. J.: Organic carbon recycling
in Baltic Sea sediments – An integrated estimate on the system scale based
on in situ measurements, Mar. Chem., 209, 81–93,
https://doi.org/10.1016/j.marchem.2018.11.004, 2019.
Nilsson, M. M., Hylén, A., Ekeroth, N., Kononets, M. Y., Viktorsson, L.,
Almroth-Rosell, E., Roos, P., Tengberg, A., and Hall, P. O. J.: Particle
shuttling and oxidation capacity of sedimentary organic carbon on the Baltic
Sea system scale, Mar. Chem., 232, 103963, https://doi.org/10.1016/j.marchem.2021.103963, 2021.
Noffke, A., Hensen, C., Sommer, S., Scholz, F., Bohlen, L., Mosch, T.,
Graco, M., and Wallmann, K.: Benthic iron and phosphorus fluxes across the
Peruvian oxygen minimum zone, Limnol. Oceanogr., 57, 851–867,
https://doi.org/10.4319/lo.2012.57.3.0851, 2012.
Piontek, J., Endres, S., Le Moigne, F. A. C., Schartau, M., and Engel, A.:
Relevance of nutrient-limited phytoplankton production and its bacterial
remineralization for carbon and oxygen fluxes in the Baltic Sea, Front. Mar.
Sci., 6, 581, https://doi.org/10.3389/fmars.2019.00581, 2019.
R Core Team: A Language and Environment for Statistical Computing,
available at: https://www.r-project.org/ (last access: 20 August 2020), 2020.
Redfield, A. C.: The biological control of chemical factors in the
environment, Am. Sci., 46, 205–221, 1958.
Reusch, T. B. H., Dierking, J., Andersson, H. C., Bonsdorff, E., Carstensen,
J., Casini, M., Czajkowski, M., Hasler, B., Hinsby, K., Hyytiäinen, K.,
Johannesson, K., Jomaa, S., Jormalainen, V., Kuosa, H., Kurland, S.,
Ojaveer, H., Refsgaard, J. C., Sandström, A., Schwarz, G., Laikre, L.,
MacKenzie, B. R., Margonski, P., Melzner, F., Oesterwind, D., Ojaveer, H.,
Refsgaard, J. C., Sandström, A., Schwarz, G., Tonderski, K., Winder, M.,
and Zandersen, M.: The Baltic Sea as a time machine for the future coastal
ocean, Science Advances, 4, eaar8195, https://doi.org/10.1126/sciadv.aar8195, 2018.
Ruttenberg, K. C.: Development of a sequential extraction method for
different forms of phosphorus in marine sediments, Limnol. Oceanogr., 37,
1460–1482, https://doi.org/10.4319/lo.1992.37.7.1460, 1992.
Ruttenberg, K. C.: The Global Phosphorus Cycle, in: Treasie on Geochemistry, edited by: Holland, H. D. and Turekian, K. K., Elsevier, 585–643, 2003.
Schmale, O., Krause, S., Holtermann, P. L., Power Guerra, N. C., and Umlauf,
L.: Dense bottom gravity currents and their impact on pelagic methanotrophy
at oxic/anoxic transition zones, Geophys. Res. Lett., 43, 5225–5232,
https://doi.org/10.1002/2016GL069032, 2016.
Slomp, C. P., Epping, E. H. G., Helder, W., and Van Raaphorst, W.: A key role
for iron-bound phosphorus in authigenic apatite formation in North Atlantic
continental platform sediments, J. Mar. Res., 54, 1179–1205, 1996.
SMHI: SHARKweb, available at: http://sharkweb.smhi.se, last access: 20 March 2021.
Soetaert, K., Petzoldt, T., Meysman, F. J. R., and Meire, L.: “marelac” R
package, v. 2.1.10, available at:
https://CRAN.R-project.org/package=marelac (last access: 15 May 2020), 2020.
Sommer, S., Clemens, D., Yücel, M., Pfannkuche, O., Hall, P. O. J.,
Almroth-Rosell, E., Schulz-Vogt, H. N., and Dale, A. W.: Major Bottom Water
Ventilation Events Do Not Significantly Reduce Basin-Wide Benthic N and P
Release in the Eastern Gotland Basin (Baltic Sea), Front. Mar. Sci., 4,
18, https://doi.org/10.3389/fmars.2017.00018, 2017.
Steenbergh, A. K., Bodelier, P. L. E., Hoogveld, H. L., Slomp, C. P., and
Laanbroek, H. J.: Phosphatases relieve carbon limitation of microbial
activity in Baltic Sea sediments along a redox-gradient, Limnol. Oceanogr.,
56, 2018–2026, https://doi.org/10.4319/lo.2011.56.6.2018, 2011.
Steenbergh, A. K., Bodelier, P. L. E., Heldal, M., Slomp, C. P., and
Laanbroek, H. J.: Does microbial stoichiometry modulate eutrophication of
aquatic ecosystems?, Environ. Microbiol., 15, 1572–1579,
https://doi.org/10.1111/1462-2920.12042, 2013.
Stigebrandt, A.: On the response of the Baltic proper to changes of the
total phosphorus supply, Ambio, 47, 31–44, https://doi.org/10.1007/s13280-017-0933-7, 2018.
Stigebrandt, A., Rosenberg, R., Magnusson, M., and Linders, T.: Oxygenated
deep bottoms beneath a thick hypoxic layer lack potential of benthic
colonization, Ambio, 47, 106–109, https://doi.org/10.1007/s13280-017-0938-2, 2018.
Sundby, B., Anderson, L. G., Hall, P. O. J., Iverfeldt, Å., van der Loeff, M. M. R., and Westerlund, S. F. G.: The effect of oxygen on release and uptake of cobalt, manganese, iron and phosphate at the sediment-water interface, Geochim. Cosmochim. Ac., 50, 1281–1288,
https://doi.org/10.1016/0016-7037(86)90411-4, 1986.
Vahtera, E., Conley, D. J., Gustafsson, B. G., Kuosa, H., Pitkänen, H.,
Savchuk, O. P., Tamminen, T., Viitasalo, M., Voss, M., Wasmund, N., and
Wulff, F.: Internal ecosystem feedbacks enhance nitrogen-fixing
cyanobacteria blooms and complicate management in the Baltic Sea, Ambio,
36, 186–194, https://doi.org/10.1579/0044-7447(2007)36[186:IEFENC]2.0.CO;2, 2007.
van de Velde, S. J., Hidalgo-Martinez, S., Callebaut, I., Antler, G., James,
R. K., Leermakers, M., and Meysman, F. J. R.: Burrowing fauna mediate
alternative stable states in the redox cycling of salt marsh sediments,
Geochim. Cosmochim. Ac., 276, 31–49, https://doi.org/10.1016/j.gca.2020.02.021, 2020a.
van de Velde, S. J., Hylén, A., Marzocchi, U., Leermakers, M., Kononets,
M. Y., Choumiline, K., Hall, P. O. J., and Meysman, F. J. R.: Elevated
sedimentary removal of Fe, Mn and trace elements following a transient
oxygenation event in the Eastern Gotland Basin, central Baltic Sea, Geochim. Cosmochim. Ac., 271, 16–32, https://doi.org/10.1016/j.gca.2019.11.034, 2020b.
van Nugteren, P., Moodley, L., Brummer, G. J., Heip, C. H. R., Herman, P. M.
J., and Middelburg, J. J.: Seafloor ecosystem functioning: The importance of
organic matter priming, Mar. Biol., 156, 2277–2287,
https://doi.org/10.1007/s00227-009-1255-5, 2009.
Viktorsson, L., Ekeroth, N., Nilsson, M., Kononets, M., and Hall, P. O. J.: Phosphorus recycling in sediments of the central Baltic Sea, Biogeosciences, 10, 3901–3916, https://doi.org/10.5194/bg-10-3901-2013, 2013.
Yao, W. and Millero, F. J.: Adsorption of phosphate on manganese dioxide in
seawater, Environ. Sci. Technol., 30, 536–541, https://doi.org/10.1021/es950290x,
1996.
Zillén, L., Conley, D. J., Andrén, T., Andrén, E., and
Björck, S.: Past occurrences of hypoxia in the Baltic Sea and the role
of climate variability, environmental change and human impact, Earth-Sci. Rev., 91, 77–92, https://doi.org/10.1016/j.earscirev.2008.10.001, 2008.
Short summary
Sediments in oxygen-depleted ocean areas release high amounts of phosphorus, feeding algae that consume oxygen upon degradation, leading to further phosphorus release. Oxygenation is thought to trap phosphorus in the sediment and break this feedback. We studied the sediment phosphorus cycle in a previously anoxic area after an inflow of oxic water. Surprisingly, the sediment phosphorus release increased, showing that feedbacks between phosphorus release and oxygen depletion can be hard to break.
Sediments in oxygen-depleted ocean areas release high amounts of phosphorus, feeding algae that...
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