Articles | Volume 18, issue 6
https://doi.org/10.5194/bg-18-2139-2021
© 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-18-2139-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
24 Mar 2021
Research article |
| 24 Mar 2021
| 24 Mar 2021
Organic carbon densities and accumulation rates in surface sediments of the North Sea and Skagerrak
Geological Survey of Norway, P.O. Box 6315, Torgarden, 7491
Trondheim, Norway
Terje Thorsnes
Geological Survey of Norway, P.O. Box 6315, Torgarden, 7491
Trondheim, Norway
Lilja Rún Bjarnadóttir
Geological Survey of Norway, P.O. Box 6315, Torgarden, 7491
Trondheim, Norway
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Dragging fishing nets across the seafloor might lead to the release of carbon dioxide, potentially leading to negative consequences such as the ocean turning sour and the planet heating up even more quickly. Protecting areas of the seabed from such human activities could help reduce negative consequences, but which places should be protected? We present a new method to map areas of the seabed offshore Norway which are most at risk and could be considered for protection.
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A new digital map of the sediment types covering the bottom of the ocean has been created. Direct observations of the seafloor sediments are few and far apart. Therefore, machine learning was used to fill those gaps between observations. This was possible because known relationships between sediment types and the environment in which they form (e.g. water depth, temperature, and salt content) could be exploited. The results are expected to provide important information for marine research.
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Dragging fishing nets across the seafloor might lead to the release of carbon dioxide, potentially leading to negative consequences such as the ocean turning sour and the planet heating up even more quickly. Protecting areas of the seabed from such human activities could help reduce negative consequences, but which places should be protected? We present a new method to map areas of the seabed offshore Norway which are most at risk and could be considered for protection.
Mark Chatting, Markus Diesing, William Ross Hunter, Anthony Grey, Brian P. Kelleher, and Mark Coughlan
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Marine sediments store carbon and are critical in the global carbon cycle, but data gaps reduce the accuracy of carbon stock estimates. This study improves estimates in the Irish Sea by refining key data inputs. Using machine learning and bias adjustments, the new model suggests previous estimates overestimated carbon stocks by 31.4 %. The findings highlight the need for more accurate sediment measurements to guide environmental policies and better protect carbon storage in marine ecosystems.
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A new digital map of the sediment types covering the bottom of the ocean has been created. Direct observations of the seafloor sediments are few and far apart. Therefore, machine learning was used to fill those gaps between observations. This was possible because known relationships between sediment types and the environment in which they form (e.g. water depth, temperature, and salt content) could be exploited. The results are expected to provide important information for marine research.
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Long-term pH variation in coastal waters along the Korean Peninsula was assessed for the first time, and it exhibited no significant pH change over an 11-year period. This contrasts with the ongoing pH decline in open oceans and other coastal areas. Analysis of environmental data showed that pH is mainly controlled by dissolved oxygen in bottom waters. This suggests that ocean warming could cause a pH decline in Korean coastal waters, affecting many fish and seaweed aquaculture operations.
Kadir Biçe, Tristen Myers Stewart, George G. Waldbusser, and Christof Meile
Biogeosciences, 22, 641–657, https://doi.org/10.5194/bg-22-641-2025, https://doi.org/10.5194/bg-22-641-2025, 2025
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We studied the effect of addition of carbonate minerals on coastal sediments. We carried out laboratory experiments to quantify the dissolution kinetics and integrated these observations into a numerical model that describes biogeochemical cycling in surficial sediments. Using the model, we demonstrate the buffering effect of the mineral additions and their duration. We quantify the effect under different environmental conditions and assess the potential for increased atmospheric CO2 uptake.
Feifei Liu, Ute Daewel, Jan Kossack, Kubilay Timur Demir, Helmuth Thomas, and Corinna Schrum
EGUsphere, https://doi.org/10.5194/egusphere-2025-81, https://doi.org/10.5194/egusphere-2025-81, 2025
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Ocean Alkalinity Enhancement boosts oceanic CO₂ absorption, offering a climate solution. Using a regional model, we examined OAE in the North Sea, revealing that shallow coastal areas achieve higher CO₂ uptake than offshore, where alkalinity is more susceptible to deep-ocean loss. Long-term carbon storage is limited, and pH shifts vary by location. Our findings guide OAE deployment to optimize carbon removal while minimizing ecological effects, supporting global climate mitigation efforts.
Jessica L. Oberlander, Mackenzie E. Burke, Cat A. London, and Hugh L. MacIntyre
Biogeosciences, 22, 499–512, https://doi.org/10.5194/bg-22-499-2025, https://doi.org/10.5194/bg-22-499-2025, 2025
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Ocean alkalinity enhancement (OAE) is a promising negative emission technology that results in the net sequestration of atmospheric carbon. In this paper, we assess the potential impact of OAE on phytoplankton through an analysis of prior studies and the effects of simulated OAE on photosynthetic competence. Our findings suggest that there may be little if any significant impact on most phytoplankton studied to date if OAE is conducted in well-flushed, nearshore environments.
Laura Marín-Samper, Javier Arístegui, Nauzet Hernández-Hernández, and Ulf Riebesell
Biogeosciences, 21, 5707–5724, https://doi.org/10.5194/bg-21-5707-2024, https://doi.org/10.5194/bg-21-5707-2024, 2024
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This study exposed a natural community to two non-CO2-equilibrated ocean alkalinity enhancement (OAE) deployments using different minerals. Adding alkalinity in this manner decreases dissolved CO2, essential for photosynthesis. While photosynthesis was not suppressed, bloom formation was mildly delayed, potentially impacting marine food webs. The study emphasizes the need for further research on OAE without prior equilibration and on its ecological implications.
Riss M. Kell, Rebecca J. Chmiel, Deepa Rao, Dawn M. Moran, Matthew R. McIlvin, Tristan J. Horner, Nicole L. Schanke, Ichiko Sugiyama, Robert B. Dunbar, Giacomo R. DiTullio, and Mak A. Saito
Biogeosciences, 21, 5685–5706, https://doi.org/10.5194/bg-21-5685-2024, https://doi.org/10.5194/bg-21-5685-2024, 2024
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Despite interest in modeling the biogeochemical uptake and cycling of the trace metal zinc (Zn), measurements of Zn uptake in natural marine phytoplankton communities have not been conducted previously. To fill this gap, we employed a stable isotope uptake rate measurement method to quantify Zn uptake into natural phytoplankton assemblages within the Southern Ocean. Zn demand was high and rapid enough to depress the inventory of Zn available to phytoplankton on seasonal timescales.
Luisa Chiara Meiritz, Tim Rixen, Anja Karin van der Plas, Tarron Lamont, and Niko Lahajnar
Biogeosciences, 21, 5261–5276, https://doi.org/10.5194/bg-21-5261-2024, https://doi.org/10.5194/bg-21-5261-2024, 2024
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Moored and drifting sediment trap experiments in the northern (nBUS) and southern (sBUS) Benguela Upwelling System showed that active carbon fluxes by vertically migrating zooplankton were about 3 times higher in the sBUS than in the nBUS. Despite these large variabilities, the mean passive particulate organic carbon (POC) fluxes were almost equal in the two subsystems. The more intense near-bottom oxygen minimum layer seems to lead to higher POC fluxes and accumulation rates in the nBUS.
Michael R. Roman, Andrew H. Altieri, Denise Breitburg, Erica M. Ferrer, Natalya D. Gallo, Shin-ichi Ito, Karin Limburg, Kenneth Rose, Moriaki Yasuhara, and Lisa A. Levin
Biogeosciences, 21, 4975–5004, https://doi.org/10.5194/bg-21-4975-2024, https://doi.org/10.5194/bg-21-4975-2024, 2024
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Oxygen-depleted ocean waters have increased worldwide. In order to improve our understanding of the impacts of this oxygen loss on marine life it is essential that we develop reliable indicators that track the negative impacts of low oxygen. We review various indicators of low-oxygen stress for marine animals including their use, research needs, and application to confront the challenges of ocean oxygen loss.
Charlotte Eich, Mathijs van Manen, J. Scott P. McCain, Loay J. Jabre, Willem H. van de Poll, Jinyoung Jung, Sven B. E. H. Pont, Hung-An Tian, Indah Ardiningsih, Gert-Jan Reichart, Erin M. Bertrand, Corina P. D. Brussaard, and Rob Middag
Biogeosciences, 21, 4637–4663, https://doi.org/10.5194/bg-21-4637-2024, https://doi.org/10.5194/bg-21-4637-2024, 2024
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Phytoplankton growth in the Southern Ocean (SO) is often limited by low iron (Fe) concentrations. Sea surface warming impacts Fe availability and can affect phytoplankton growth. We used shipboard Fe clean incubations to test how changes in Fe and temperature affect SO phytoplankton. Their abundances usually increased with Fe addition and temperature increase, with Fe being the major factor. These findings imply potential shifts in ecosystem structure, impacting food webs and elemental cycling.
Miriam Tivig, David P. Keller, and Andreas Oschlies
Biogeosciences, 21, 4469–4493, https://doi.org/10.5194/bg-21-4469-2024, https://doi.org/10.5194/bg-21-4469-2024, 2024
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Marine biological production is highly dependent on the availability of nitrogen and phosphorus. Rivers are the main source of phosphorus to the oceans but poorly represented in global model oceans. We include dissolved nitrogen and phosphorus from river export in a global model ocean and find that the addition of riverine phosphorus affects marine biology on millennial timescales more than riverine nitrogen alone. Globally, riverine phosphorus input increases primary production rates.
David Curbelo-Hernández, David González-Santana, Aridane González-González, J. Magdalena Santana-Casiano, and Melchor González-Dávila
EGUsphere, https://doi.org/10.5194/egusphere-2024-2709, https://doi.org/10.5194/egusphere-2024-2709, 2024
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This study offers a unique high-resolution dataset (2019–2024) on surface physicochemical properties in the western Mediterranean Sea. It reveals accelerated surface warming, significantly altering CO2 levels and pH. Currently a net CO2 sink, the region may become a CO2 source by 2030 due to weakening ingassing. The research highlights the value of VOS lines for monitoring climate impacts and stresses the need for ongoing observation to enhance long-term trend accuracy and future projections.
Esdoorn Willcox, Marcos Lemes, Thomas Juul-Pedersen, Mikael Kristian Sejr, Johnna Marchiano Holding, and Søren Rysgaard
Biogeosciences, 21, 4037–4050, https://doi.org/10.5194/bg-21-4037-2024, https://doi.org/10.5194/bg-21-4037-2024, 2024
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In this work, we measured the chemistry of seawater from samples obtained from different depths and locations off the east coast of the Northeast Greenland National Park to determine what is influencing concentrations of dissolved CO2. Historically, the region has always been thought to take up CO2 from the atmosphere, but we show that it is possible for the region to become a source in late summer. We discuss the variables that may be related to such changes.
Vlad A. Macovei, Louise C. V. Rewrie, Rüdiger Röttgers, and Yoana G. Voynova
EGUsphere, https://doi.org/10.5194/egusphere-2024-2643, https://doi.org/10.5194/egusphere-2024-2643, 2024
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A commercial vessel equipped with scientific instruments regularly travelled between two large macro-tidal estuaries. We found that biogeochemical variability in the outer estuaries is driven by the 14-day spring-neap tidal cycle, with strong effects on dissolved inorganic and organic carbon concentrations and distribution. Since this land-sea interface effect increases the strength of the carbon source to the atmosphere by 74 % during spring tide, it should be accounted for in regional models.
Lennart Thomas Bach, Aaron James Ferderer, Julie LaRoche, and Kai Georg Schulz
Biogeosciences, 21, 3665–3676, https://doi.org/10.5194/bg-21-3665-2024, https://doi.org/10.5194/bg-21-3665-2024, 2024
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Ocean alkalinity enhancement (OAE) is an emerging marine CO2 removal method, but its environmental effects are insufficiently understood. The OAE Pelagic Impact Intercomparison Project (OAEPIIP) provides funding for a standardized and globally replicated microcosm experiment to study the effects of OAE on plankton communities. Here, we provide a detailed manual for the OAEPIIP experiment. We expect OAEPIIP to help build scientific consensus on the effects of OAE on plankton.
Marlena Szeligowska, Déborah Benkort, Anna Przyborska, Mateusz Moskalik, Bernabé Moreno, Emilia Trudnowska, and Katarzyna Błachowiak-Samołyk
Biogeosciences, 21, 3617–3639, https://doi.org/10.5194/bg-21-3617-2024, https://doi.org/10.5194/bg-21-3617-2024, 2024
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The European Arctic is experiencing rapid regional warming, causing glaciers that terminate in the sea to retreat onto land. Due to this process, the area of a well-studied fjord, Hornsund, has increased by around 100 km2 (40%) since 1976. Combining satellite and in situ data with a mathematical model, we estimated that, despite some negative consequences of glacial meltwater release, such emerging coastal waters could mitigate climate change by increasing carbon uptake and storage by sediments.
Mallory C. Ringham, Nathan Hirtle, Cody Shaw, Xi Lu, Julian Herndon, Brendan R. Carter, and Matthew D. Eisaman
Biogeosciences, 21, 3551–3570, https://doi.org/10.5194/bg-21-3551-2024, https://doi.org/10.5194/bg-21-3551-2024, 2024
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Ocean alkalinity enhancement leverages the large surface area and carbon storage capacity of the oceans to store atmospheric CO2 as dissolved bicarbonate. We monitored CO2 uptake in seawater treated with NaOH to establish operational boundaries for carbon removal experiments. Results show that CO2 equilibration occurred on the order of weeks to months, was consistent with values expected from equilibration calculations, and was limited by mineral precipitation at high pH and CaCO3 saturation.
Riel Carlo O. Ingeniero, Gesa Schulz, and Hermann W. Bange
Biogeosciences, 21, 3425–3440, https://doi.org/10.5194/bg-21-3425-2024, https://doi.org/10.5194/bg-21-3425-2024, 2024
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Our research is the first to measure dissolved NO concentrations in temperate estuarine waters, providing insights into its distribution under varying conditions and enhancing our understanding of its production processes. Dissolved NO was supersaturated in the Elbe Estuary, indicating that it is a source of atmospheric NO. The observed distribution of dissolved NO most likely resulted from nitrification.
Weiyi Tang, Jeff Talbott, Timothy Jones, and Bess B. Ward
Biogeosciences, 21, 3239–3250, https://doi.org/10.5194/bg-21-3239-2024, https://doi.org/10.5194/bg-21-3239-2024, 2024
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Wastewater treatment plants (WWTPs) are known to be hotspots of greenhouse gas emissions. However, the impact of WWTPs on the emission of the greenhouse gas N2O in downstream aquatic environments is less constrained. We found spatially and temporally variable but overall higher N2O concentrations and fluxes in waters downstream of WWTPs, pointing to the need for efficient N2O removal in addition to the treatment of nitrogen in WWTPs.
Deep S. Banerjee and Jozef Skakala
EGUsphere, https://doi.org/10.22541/essoar.171405637.76928549/v1, https://doi.org/10.22541/essoar.171405637.76928549/v1, 2024
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Nitrate is a crucial nutrient in oceans. Excess nutrients can trigger uncontrolled algae growth (eutrophication), damaging marine ecosystems. We used a machine learning tool to generate a skilled, gap-free, bi-decadal surface nitrate dataset from sparse observations. This dataset reveals areas on the North West European Shelf at risk of eutrophication, bi-decadal trends in coastal nitrate, and an impact of winter nitrate on spring phytoplankton blooms.
Amanda Y. L. Cheong, Kogila Vani Annammala, Ee Ling Yong, Yongli Zhou, Robert S. Nichols, and Patrick Martin
Biogeosciences, 21, 2955–2971, https://doi.org/10.5194/bg-21-2955-2024, https://doi.org/10.5194/bg-21-2955-2024, 2024
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We measured nutrients and dissolved organic matter for 1 year in a eutrophic tropical estuary to understand their sources and cycling. Our data show that the dissolved organic matter originates partly from land and partly from microbial processes in the water. Internal recycling is likely important for maintaining high nutrient concentrations, and we found that there is often excess nitrogen compared to silicon and phosphorus. Our data help to explain how eutrophication persists in this system.
Darren Pilcher, Jessica Cross, Natalie Monacci, Linquan Mu, Kelly Kearney, Albert Hermann, and Wei Cheng
EGUsphere, https://doi.org/10.5194/egusphere-2024-1096, https://doi.org/10.5194/egusphere-2024-1096, 2024
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The Bering Sea shelf is a highly productive marine ecosystem that is vulnerable to ocean acidification. We use a computational model to simulate the carbon cycle and acidification rates from 1970–2022. The results suggest that bottom water acidification rates are more than twice as great as surface rates. Bottom waters are also naturally more acidic, thus these waters will pass key thresholds known to negatively impact marine organisms, such as red king crab, much sooner than surface waters.
Aaron Ferderer, Kai G. Schulz, Ulf Riebesell, Kirralee G. Baker, Zanna Chase, and Lennart T. Bach
Biogeosciences, 21, 2777–2794, https://doi.org/10.5194/bg-21-2777-2024, https://doi.org/10.5194/bg-21-2777-2024, 2024
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Ocean alkalinity enhancement (OAE) is a promising method of atmospheric carbon removal; however, its ecological impacts remain largely unknown. We assessed the effects of simulated silicate- and calcium-based mineral OAE on diatom silicification. We found that increased silicate concentrations from silicate-based OAE increased diatom silicification. In contrast, the enhancement of alkalinity had no effect on community silicification and minimal effects on the silicification of different genera.
David González-Santana, María Segovia, Melchor González-Dávila, Librada Ramírez, Aridane G. González, Leonardo J. Pozzo-Pirotta, Veronica Arnone, Victor Vázquez, Ulf Riebesell, and J. Magdalena Santana-Casiano
Biogeosciences, 21, 2705–2715, https://doi.org/10.5194/bg-21-2705-2024, https://doi.org/10.5194/bg-21-2705-2024, 2024
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In a recent experiment off the coast of Gran Canaria (Spain), scientists explored a method called ocean alkalinization enhancement (OAE), where carbonate minerals were added to seawater. This process changed the levels of certain ions in the water, affecting its pH and buffering capacity. The researchers were particularly interested in how this could impact the levels of essential trace metals in the water.
Lucas Porz, Wenyan Zhang, Nils Christiansen, Jan Kossack, Ute Daewel, and Corinna Schrum
Biogeosciences, 21, 2547–2570, https://doi.org/10.5194/bg-21-2547-2024, https://doi.org/10.5194/bg-21-2547-2024, 2024
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Seafloor sediments store a large amount of carbon, helping to naturally regulate Earth's climate. If disturbed, some sediment particles can turn into CO2, but this effect is not well understood. Using computer simulations, we found that bottom-contacting fishing gears release about 1 million tons of CO2 per year in the North Sea, one of the most heavily fished regions globally. We show how protecting certain areas could reduce these emissions while also benefitting seafloor-living animals.
Jiaying A. Guo, Robert F. Strzepek, Kerrie M. Swadling, Ashley T. Townsend, and Lennart T. Bach
Biogeosciences, 21, 2335–2354, https://doi.org/10.5194/bg-21-2335-2024, https://doi.org/10.5194/bg-21-2335-2024, 2024
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Ocean alkalinity enhancement aims to increase atmospheric CO2 sequestration by adding alkaline materials to the ocean. We assessed the environmental effects of olivine and steel slag powder on coastal plankton. Overall, slag is more efficient than olivine in releasing total alkalinity and, thus, in its ability to sequester CO2. Slag also had less environmental effect on the enclosed plankton communities when considering its higher CO2 removal potential based on this 3-week experiment.
Giovanni Galli, Sarah Wakelin, James Harle, Jason Holt, and Yuri Artioli
Biogeosciences, 21, 2143–2158, https://doi.org/10.5194/bg-21-2143-2024, https://doi.org/10.5194/bg-21-2143-2024, 2024
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This work shows that, under a high-emission scenario, oxygen concentration in deep water of parts of the North Sea and Celtic Sea can become critically low (hypoxia) towards the end of this century. The extent and frequency of hypoxia depends on the intensity of climate change projected by different climate models. This is the result of a complex combination of factors like warming, increase in stratification, changes in the currents and changes in biological processes.
Sandy E. Tenorio and Laura Farías
Biogeosciences, 21, 2029–2050, https://doi.org/10.5194/bg-21-2029-2024, https://doi.org/10.5194/bg-21-2029-2024, 2024
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Time series studies show that CH4 is highly dynamic on the coastal ocean surface and planktonic communities are linked to CH4 accumulation, as found in coastal upwelling off Chile. We have identified the crucial role of picoplankton (> 3 µm) in CH4 recycling, especially with the addition of methylated substrates (trimethylamine and methylphosphonic acid) during upwelling and non-upwelling periods. These insights improve understanding of surface ocean CH4 recycling, aiding CH4 emission estimates.
Charlotte A. J. Williams, Tom Hull, Jan Kaiser, Claire Mahaffey, Naomi Greenwood, Matthew Toberman, and Matthew R. Palmer
Biogeosciences, 21, 1961–1971, https://doi.org/10.5194/bg-21-1961-2024, https://doi.org/10.5194/bg-21-1961-2024, 2024
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Oxygen (O2) is a key indicator of ocean health. The risk of O2 loss in the productive coastal/continental slope regions is increasing. Autonomous underwater vehicles equipped with O2 optodes provide lots of data but have problems resolving strong vertical O2 changes. Here we show how to overcome this and calculate how much O2 is supplied to the low-O2 bottom waters via mixing. Bursts in mixing supply nearly all of the O2 to bottom waters in autumn, stopping them reaching ecologically low levels.
Sabine Schmidt and Ibrahima Iris Diallo
Biogeosciences, 21, 1785–1800, https://doi.org/10.5194/bg-21-1785-2024, https://doi.org/10.5194/bg-21-1785-2024, 2024
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Along the French coast facing the Bay of Biscay, the large Gironde and Loire estuaries suffer from hypoxia. This prompted a study of the small Charente estuary located between them. This work reveals a minimum oxygen zone in the Charente estuary, which extends for about 25 km. Temperature is the main factor controlling the hypoxia. This calls for the monitoring of small turbid macrotidal estuaries that are vulnerable to hypoxia, a risk expected to increase with global warming.
Simone R. Alin, Jan A. Newton, Richard A. Feely, Samantha Siedlecki, and Dana Greeley
Biogeosciences, 21, 1639–1673, https://doi.org/10.5194/bg-21-1639-2024, https://doi.org/10.5194/bg-21-1639-2024, 2024
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We provide a new multi-stressor data product that allows us to characterize the seasonality of temperature, O2, and CO2 in the southern Salish Sea and delivers insights into the impacts of major marine heatwave and precipitation anomalies on regional ocean acidification and hypoxia. We also describe the present-day frequencies of temperature, O2, and ocean acidification conditions that cross thresholds of sensitive regional species that are economically or ecologically important.
Pamela Linford, Iván Pérez-Santos, Paulina Montero, Patricio A. Díaz, Claudia Aracena, Elías Pinilla, Facundo Barrera, Manuel Castillo, Aida Alvera-Azcárate, Mónica Alvarado, Gabriel Soto, Cécile Pujol, Camila Schwerter, Sara Arenas-Uribe, Pilar Navarro, Guido Mancilla-Gutiérrez, Robinson Altamirano, Javiera San Martín, and Camila Soto-Riquelme
Biogeosciences, 21, 1433–1459, https://doi.org/10.5194/bg-21-1433-2024, https://doi.org/10.5194/bg-21-1433-2024, 2024
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The Patagonian fjords comprise a world region where low-oxygen water and hypoxia conditions are observed. An in situ dataset was used to quantify the mechanism involved in the presence of these conditions in northern Patagonian fjords. Water mass analysis confirmed the contribution of Equatorial Subsurface Water in the advection of the low-oxygen water, and hypoxic conditions occurred when the community respiration rate exceeded the gross primary production.
Ting Wang, Buyun Du, Inke Forbrich, Jun Zhou, Joshua Polen, Elsie M. Sunderland, Prentiss H. Balcom, Celia Chen, and Daniel Obrist
Biogeosciences, 21, 1461–1476, https://doi.org/10.5194/bg-21-1461-2024, https://doi.org/10.5194/bg-21-1461-2024, 2024
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The strong seasonal increases of Hg in aboveground biomass during the growing season and the lack of changes observed after senescence in this salt marsh ecosystem suggest physiologically controlled Hg uptake pathways. The Hg sources found in marsh aboveground tissues originate from a mix of sources, unlike terrestrial ecosystems, where atmospheric GEM is the main source. Belowground plant tissues mostly take up Hg from soils. Overall, the salt marsh currently serves as a small net Hg sink.
Eleanor Simpson, Debby Ianson, Karen E. Kohfeld, Ana C. Franco, Paul A. Covert, Marty Davelaar, and Yves Perreault
Biogeosciences, 21, 1323–1353, https://doi.org/10.5194/bg-21-1323-2024, https://doi.org/10.5194/bg-21-1323-2024, 2024
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Shellfish aquaculture operates in nearshore areas where data on ocean acidification parameters are limited. We show daily and seasonal variability in pH and saturation states of calcium carbonate at nearshore aquaculture sites in British Columbia, Canada, and determine the contributing drivers of this variability. We find that nearshore locations have greater variability than open waters and that the uptake of carbon by phytoplankton is the major driver of pH and saturation state variability.
S. Alejandra Castillo Cieza, Rachel H. R. Stanley, Pierre Marrec, Diana N. Fontaine, E. Taylor Crockford, Dennis J. McGillicuddy Jr., Arshia Mehta, Susanne Menden-Deuer, Emily E. Peacock, Tatiana A. Rynearson, Zoe O. Sandwith, Weifeng Zhang, and Heidi M. Sosik
Biogeosciences, 21, 1235–1257, https://doi.org/10.5194/bg-21-1235-2024, https://doi.org/10.5194/bg-21-1235-2024, 2024
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The coastal ocean in the northeastern USA provides many services, including fisheries and habitats for threatened species. In summer 2019, a bloom occurred of a large unusual phytoplankton, the diatom Hemiaulus, with nitrogen-fixing symbionts. This led to vast changes in productivity and grazing rates in the ecosystem. This work shows that the emergence of one species can have profound effects on ecosystem function. Such changes may become more prevalent as the ocean warms due to climate change.
Claudine Hauri, Brita Irving, Sam Dupont, Rémi Pagés, Donna D. W. Hauser, and Seth L. Danielson
Biogeosciences, 21, 1135–1159, https://doi.org/10.5194/bg-21-1135-2024, https://doi.org/10.5194/bg-21-1135-2024, 2024
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Arctic marine ecosystems are highly susceptible to impacts of climate change and ocean acidification. We present pH and pCO2 time series (2016–2020) from the Chukchi Ecosystem Observatory and analyze the drivers of the current conditions to get a better understanding of how climate change and ocean acidification could affect the ecological niches of organisms.
William Hiles, Lucy C. Miller, Craig Smeaton, and William E. N. Austin
Biogeosciences, 21, 929–948, https://doi.org/10.5194/bg-21-929-2024, https://doi.org/10.5194/bg-21-929-2024, 2024
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Saltmarsh soils may help to limit the rate of climate change by storing carbon. To understand their impacts, they must be accurately mapped. We use drone data to estimate the size of three saltmarshes in NE Scotland. We find that drone imagery, combined with tidal data, can reliably inform our understanding of saltmarsh size. When compared with previous work using vegetation communities, we find that our most reliable new estimates of stored carbon are 15–20 % smaller than previously estimated.
De'Marcus Robinson, Anh L. D. Pham, David J. Yousavich, Felix Janssen, Frank Wenzhöfer, Eleanor C. Arrington, Kelsey M. Gosselin, Marco Sandoval-Belmar, Matthew Mar, David L. Valentine, Daniele Bianchi, and Tina Treude
Biogeosciences, 21, 773–788, https://doi.org/10.5194/bg-21-773-2024, https://doi.org/10.5194/bg-21-773-2024, 2024
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The present study suggests that high release of ferrous iron from the seafloor of the oxygen-deficient Santa Barabara Basin (California) supports surface primary productivity, creating positive feedback on seafloor iron release by enhancing low-oxygen conditions in the basin.
David J. Yousavich, De'Marcus Robinson, Xuefeng Peng, Sebastian J. E. Krause, Frank Wenzhöfer, Felix Janssen, Na Liu, Jonathan Tarn, Franklin Kinnaman, David L. Valentine, and Tina Treude
Biogeosciences, 21, 789–809, https://doi.org/10.5194/bg-21-789-2024, https://doi.org/10.5194/bg-21-789-2024, 2024
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Declining oxygen (O2) concentrations in coastal oceans can threaten people’s ways of life and food supplies. Here, we investigate how mats of bacteria that proliferate on the seafloor of the Santa Barbara Basin sustain and potentially worsen these O2 depletion events through their unique chemoautotrophic metabolism. Our study shows how changes in seafloor microbiology and geochemistry brought on by declining O2 concentrations can help these mats grow as well as how that growth affects the basin.
Krysten Rutherford, Katja Fennel, Lina Garcia Suarez, and Jasmin G. John
Biogeosciences, 21, 301–314, https://doi.org/10.5194/bg-21-301-2024, https://doi.org/10.5194/bg-21-301-2024, 2024
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We downscaled two mid-century (~2075) ocean model projections to a high-resolution regional ocean model of the northwest North Atlantic (NA) shelf. In one projection, the NA shelf break current practically disappears; in the other it remains almost unchanged. This leads to a wide range of possible future shelf properties. More accurate projections of coastal circulation features would narrow the range of possible outcomes of biogeochemical projections for shelf regions.
Lennart Thomas Bach
Biogeosciences, 21, 261–277, https://doi.org/10.5194/bg-21-261-2024, https://doi.org/10.5194/bg-21-261-2024, 2024
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Ocean alkalinity enhancement (OAE) is a widely considered marine carbon dioxide removal method. OAE aims to accelerate chemical rock weathering, which is a natural process that slowly sequesters atmospheric carbon dioxide. This study shows that the addition of anthropogenic alkalinity via OAE can reduce the natural release of alkalinity and, therefore, reduce the efficiency of OAE for climate mitigation. However, the additionality problem could be mitigated via a variety of activities.
Tsuneo Ono, Daisuke Muraoka, Masahiro Hayashi, Makiko Yorifuji, Akihiro Dazai, Shigeyuki Omoto, Takehiro Tanaka, Tomohiro Okamura, Goh Onitsuka, Kenji Sudo, Masahiko Fujii, Ryuji Hamanoue, and Masahide Wakita
Biogeosciences, 21, 177–199, https://doi.org/10.5194/bg-21-177-2024, https://doi.org/10.5194/bg-21-177-2024, 2024
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We carried out parallel year-round observations of pH and related parameters in five stations around the Japan coast. It was found that short-term acidified situations with Omega_ar less than 1.5 occurred at four of five stations. Most of such short-term acidified events were related to the short-term low salinity event, and the extent of short-term pH drawdown at high freshwater input was positively correlated with the nutrient concentration of the main rivers that flow into the coastal area.
K. Mareike Paul, Martijn Hermans, Sami A. Jokinen, Inda Brinkmann, Helena L. Filipsson, and Tom Jilbert
Biogeosciences, 20, 5003–5028, https://doi.org/10.5194/bg-20-5003-2023, https://doi.org/10.5194/bg-20-5003-2023, 2023
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Seawater naturally contains trace metals such as Mo and U, which accumulate under low oxygen conditions on the seafloor. Previous studies have used sediment Mo and U contents as an archive of changing oxygen concentrations in coastal waters. Here we show that in fjords the use of Mo and U for this purpose may be impaired by additional processes. Our findings have implications for the reliable use of Mo and U to reconstruct oxygen changes in fjords.
Hannah Sharpe, Michel Gosselin, Catherine Lalande, Alexandre Normandeau, Jean-Carlos Montero-Serrano, Khouloud Baccara, Daniel Bourgault, Owen Sherwood, and Audrey Limoges
Biogeosciences, 20, 4981–5001, https://doi.org/10.5194/bg-20-4981-2023, https://doi.org/10.5194/bg-20-4981-2023, 2023
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We studied the impact of submarine canyon processes within the Pointe-des-Monts system on biogenic matter export and phytoplankton assemblages. Using data from three oceanographic moorings, we show that the canyon experienced two low-amplitude sediment remobilization events in 2020–2021 that led to enhanced particle fluxes in the deep-water column layer > 2.6 km offshore. Sinking phytoplankton fluxes were lower near the canyon compared to background values from the lower St. Lawrence Estuary.
Cited articles
Aldridge, J. N., Parker, E. R., Bricheno, L., Green, S. L., and van der
Molen, J.: Assessment of the physical disturbance of the northern European
Continental shelf seabed by waves and currents, Cont. Shelf Res., 108,
121–140, https://doi.org/10.1016/j.csr.2015.03.004, 2015.
Aller, R. C.: Sedimentary Diagenesis, Depositional Environments, and Benthic
Fluxes, in: Treatise on Geochemistry, Elsevier, 293–334,
https://doi.org/10.1016/B978-0-08-095975-7.00611-2, 2014.
Amoroso, R. O., Pitcher, C. R., Rijnsdorp, A. D., McConnaughey, R. A.,
Parma, A. M., Suuronen, P., Eigaard, O. R., Bastardie, F., Hintzen, N. T.,
Althaus, F., Baird, S. J., Black, J., Buhl-Mortensen, L., Campbell, A. B.,
Catarino, R., Collie, J., Cowan, J. H., Durholtz, D., Engstrom, N.,
Fairweather, T. P., Fock, H. O., Ford, R., Gálvez, P. A., Gerritsen, H.,
Góngora, M. E., González, J. A., Hiddink, J. G., Hughes, K. M.,
Intelmann, S. S., Jenkins, C., Jonsson, P., Kainge, P., Kangas, M., Kathena,
J. N., Kavadas, S., Leslie, R. W., Lewis, S. G., Lundy, M., Makin, D.,
Martin, J., Mazor, T., Gonzalez-Mirelis, G., Newman, S. J., Papadopoulou,
N., Posen, P. E., Rochester, W., Russo, T., Sala, A., Semmens, J. M., Silva,
C., Tsolos, A., Vanelslander, B., Wakefield, C. B., Wood, B. A., Hilborn,
R., Kaiser, M. J., and Jennings, S.: Bottom trawl fishing footprints on the
world's continental shelves, P. Natl. Acad. Sci. USA, 115, E10275–E10282, https://doi.org/10.1073/pnas.1802379115, 2018.
Anonymous: Integrated Management of the Marine Environment of the North Sea and
Skagerrak (Management Plan). Meld. St. 37 (2012–2013) Report to the
Storting (white paper), available at:
https://www.regjeringen.no/contentassets/f9eb7ce889be4f47b5a2df5863b1be3d/en-gb/pdfs/stm201220130037000engpdfs.pdf (last access: 15 September 2020),
2013.
Assis, J., Tyberghein, L., Bosch, S., Verbruggen, H., Serrão, E. A., and
De Clerck, O.: Bio-ORACLE v2.0: Extending marine data layers for bioclimatic
modelling, Glob. Ecol. Biogeogr., 27, 277–284, https://doi.org/10.1111/geb.12693,
2018.
Atwood, T. B., Witt, A., Mayorga, J., Hammill, E., and Sala, E.: Global
Patterns in Marine Sediment Carbon Stocks, Front. Mar. Sci., 7, 165,
https://doi.org/10.3389/fmars.2020.00165, 2020.
Avelar, S., van der Voort, T. S., and Eglinton, T. I.: Relevance of carbon
stocks of marine sediments for national greenhouse gas inventories of
maritime nations, Carbon Balance Manag., 12, 10,
https://doi.org/10.1186/s13021-017-0077-x, 2017.
Bakker, J. F. and Helder, W.: Skagerrak (northeastern North Sea) oxygen
microprofiles and porewater chemistry in sediments, Mar. Geol., 111,
299–321, https://doi.org/10.1016/0025-3227(93)90137-K, 1993.
Balzer, W.: Organic matter degradation and biogenic element cycling in a
nearshore sediment (Kiel Bight)1, Limnol. Oceanogr., 29, 1231–1246,
https://doi.org/10.4319/lo.1984.29.6.1231, 1984.
Bauer, J. E., Cai, W.-J., Raymond, P. A., Bianchi, T. S., Hopkinson, C. S.,
and Regnier, P. A. G.: The changing carbon cycle of the coastal ocean,
Nature, 504, 61–70, 2013.
Berner, R. A.: Early diagenesis: A theoretical approach, Princeton
University Press, Princeton, N.J., 1980.
Berner, R. A.: Burial of organic carbon and pyrite sulfur in the modern
ocean: Its geochemical and environmental significance, Am. J. Sci., 282,
451–473, https://doi.org/10.2475/ajs.282.4.451, 1982.
Bhagirathan, U., Meenakumari, B., Jayalakshmy, K. V, Panda, S. K., Madhu, V.
R., and Vaghela, D. T.: Impact of bottom trawling on sediment
characteristics – a study along inshore waters off Veraval coast, India,
Environ. Monit. Assess., 160, 355–369, https://doi.org/10.1007/s10661-008-0700-0,
2010.
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.
De Borger, E., Tiano, J., Braeckman, U., Rijnsdorp, A. D., and Soetaert, K.: Impact of bottom trawling on sediment biogeochemistry: a modelling approach, Biogeosciences Discuss. [preprint], https://doi.org/10.5194/bg-2020-328, in review, 2020.
Breiman, L.: Random Forests, Mach. Learn., 45, 5–32, 2001.
Burdige, D. J.: Preservation of Organic Matter in Marine Sediments:
Controls, Mechanisms, and an Imbalance in Sediment Organic Carbon Budgets?,
Chem. Rev., 107, 467–485, https://doi.org/10.1021/cr050347q, 2007.
Canfield, D. E.: Factors influencing organic carbon preservation in marine
sediments, Chem. Geol., 114, 315–329,
https://doi.org/10.1016/0009-2541(94)90061-2, 1994.
de Haas, H. and van Weering, T. C. E.: Recent sediment accumulation, organic
carbon burial and transport in the northeastern North Sea, Mar. Geol., 136,
173–187, https://doi.org/10.1016/S0025-3227(96)00072-2, 1997.
de Haas, H., Boer, W., and van Weering, T. C. E.: Recent sedimentation and
organic carbon burial in a shelf sea: the North Sea, Mar. Geol., 144,
131–146, https://doi.org/10.1016/S0025-3227(97)00082-0, 1997.
de Haas, H., van Weering, T. C. E., and de Stigter, H.: Organic carbon in
shelf seas: sinks or sources, processes and products, Cont. Shelf Res.,
22, 691–717, https://doi.org/10.1016/S0278-4343(01)00093-0, 2002.
Diesing, M.: Spatially predicted sedimentation rates, organic carbon densities and organic carbon accumulation rates in the North Sea and Skagerrak, PANGAEA, https://doi.org/10.1594/PANGAEA.928272, 2021.
Diesing, M., Kröger, S., Parker, R., Jenkins, C., Mason, C., and Weston,
K.: Predicting the standing stock of organic carbon in surface sediments of
the North–West European continental shelf, Biogeochemistry, 135,
183–200, https://doi.org/10.1007/s10533-017-0310-4, 2017.
Duarte, C. M., Middelburg, J. J., and Caraco, N.: Major role of marine vegetation on the oceanic carbon cycle, Biogeosciences, 2, 1–8, https://doi.org/10.5194/bg-2-1-2005, 2005.
Duarte, C. M., Losada, I. J., Hendriks, I. E., Mazarrasa, I., and Marbà,
N.: The role of coastal plant communities for climate change mitigation and
adaptation, Nat. Clim. Change, 3, 961–968, https://doi.org/10.1038/nclimate1970,
2013.
Eigaard, O. R., Bastardie, F., Hintzen, N. T., Buhl-Mortensen, L.,
Buhl-Mortensen, P., Catarino, R., Dinesen, G. E., Egekvist, J., Fock, H. O.,
Geitner, K., Gerritsen, H. D., González, M. M., Jonsson, P., Kavadas,
S., Laffargue, P., Lundy, M., Gonzalez-Mirelis, G., Nielsen, J. R.,
Papadopoulou, N., Posen, P. E., Pulcinella, J., Russo, T., Sala, A., Silva,
C., Smith, C. J., Vanelslander, B., and Rijnsdorp, A. D.: The footprint of
bottom trawling in European waters: distribution, intensity, and seabed
integrity, ICES J. Mar. Sci., 74, 847–865, https://doi.org/10.1093/icesjms/fsw194,
2016.
Eisma, D. and Kalf, J.: Dispersal, concentration and deposition of suspended
matter in the North Sea., J. Geol. Soc. London, 144, 161–178,
https://doi.org/10.1144/gsjgs.144.1.0161, 1987.
Elvenes, S., Bøe, R., Lepland, A., and Dolan, M.: Seabed sediments of
Søre Sunnmøre, Norway, J. Maps, 15, 686–696,
https://doi.org/10.1080/17445647.2019.1659865, 2019.
Emery, K. O.: Relict sediments on continental shelves of world, Am. Assoc.
Petr. Geol. Bull., 52, 445–464, 1968.
“EMODnet Bathymetry Consortium”: EMODnet Digital Bathymetry (DTM 2018),
https://doi.org/10.12770/18ff0d48-b203-4a65-94a9-5fd8b0ec35f6, 2018.
Faust, J. C. and Knies, J.: Organic Matter Sources in North Atlantic Fjord
Sediments, Geochem. Geophy. Geosy., 20, 2872–2885,
https://doi.org/10.1029/2019GC008382, 2019.
Fennel, K., Alin, S., Barbero, L., Evans, W., Bourgeois, T., Cooley, S., Dunne, J., Feely, R. A., Hernandez-Ayon, J. M., Hu, X., Lohrenz, S., Muller-Karger, F., Najjar, R., Robbins, L., Shadwick, E., Siedlecki, S., Steiner, N., Sutton, A., Turk, D., Vlahos, P., and Wang, Z. A.: Carbon cycling in the North American coastal ocean: a synthesis, Biogeosciences, 16, 1281–1304, https://doi.org/10.5194/bg-16-1281-2019, 2019.
Griscom, B. W., Adams, J., Ellis, P. W., Houghton, R. A., Lomax, G., Miteva,
D. A., Schlesinger, W. H., Shoch, D., Siikamäki, J. V, Smith, P.,
Woodbury, P., Zganjar, C., Blackman, A., Campari, J., Conant, R. T.,
Delgado, C., Elias, P., Gopalakrishna, T., Hamsik, M. R., Herrero, M.,
Kiesecker, J., Landis, E., Laestadius, L., Leavitt, S. M., Minnemeyer, S.,
Polasky, S., Potapov, P., Putz, F. E., Sanderman, J., Silvius, M.,
Wollenberg, E., and Fargione, J.: Natural climate solutions, P. Natl.
Acad. Sci. USA, 114, 11645–11650, https://doi.org/10.1073/pnas.1710465114, 2017.
Guevara, M., Thine, C., Olmedo, G. F., and Vargas, R. R.: Data mining: random
forest, in: Soil Organic Carbon Mapping Cookbook, edited by: Yigini, Y., Olmedo, G. F., Reiter, S., Baritz, R., Viatkin, K., and Vargas, R., FAO,
Rome, 83–98,2018.
Guisan, A. and Zimmermann, N. E.: Predictive habitat distribution models in
ecology, Ecol. Model., 135, 147–186,
https://doi.org/10.1016/S0304-3800(00)00354-9, 2000.
Hall, S. J.: The continental shelf benthic ecosystem: current status, agents
for change and future prospects, Environ. Conserv., 29, 350–374,
https://doi.org/10.1017/S0376892902000243, 2002.
Halpern, B. S., Walbridge, S., Selkoe, K. A., Kappel, C. V, Micheli, F.,
D'Agrosa, C., Bruno, J. F., Casey, K. S., Ebert, C., Fox, H. E., Fujita, R.,
Heinemann, D., Lenihan, H. S., Madin, E. M. P., Perry, M. T., Selig, E. R.,
Spalding, M., Steneck, R., and Watson, R.: A Global Map of Human Impact on
Marine Ecosystems, Science, 319, 948–952,
https://doi.org/10.1126/science.1149345, 2008.
Harris, P. T., Macmillan-Lawler, M., Rupp, J., and Baker, E. K.:
Geomorphology of the oceans, Mar. Geol., 352, 4–24,
https://doi.org/10.1016/j.margeo.2014.01.011, 2014.
Hartigan, J. A. and Wong, M. A.: Algorithm AS 136: A K-Means Clustering
Algorithm, J. R. Stat. Soc. Ser. C-Appl., 28, 100–108,
https://doi.org/10.2307/2346830, 1979.
Hartnett, H. E., Keil, R. G., Hedges, J. I., and Devol, A. H.: Influence of
oxygen exposure time on organic carbon preservation in continental margin
sediments, Nature, 391, 572, https://doi.org/10.1038/35351, 1998.
Hedges, J. I. and Keil, R. G.: Sedimentary organic matter preservation: an
assessment and speculative synthesis, Mar. Chem., 49, 81–115,
https://doi.org/10.1016/0304-4203(95)00008-F, 1995.
Hemingway, J. D., Rothman, D. H., Grant, K. E., Rosengard, S. Z., Eglinton,
T. I., Derry, L. A., and Galy, V. V.: Mineral protection regulates long-term
global preservation of natural organic carbon, Nature, 570, 228–231,
https://doi.org/10.1038/s41586-019-1280-6, 2019.
Hengl, T., de Jesus, J. M., MacMillan, R. A., Batjes, N. H., Heuvelink, G.
B. M., Ribeiro, E., Samuel-Rosa, A., Kempen, B., Leenaars, J. G. B., Walsh,
M. G., and Gonzalez, M. R.: SoilGrids1km – Global Soil Information Based on
Automated Mapping, Plos One, 9, e105992, https://doi.org/10.1371/journal.pone.0105992, 2014.
Hengl, T., de Jesus, J., Heuvelink, G. B. M., Ruiperez Gonzalez, M.,
Kilibarda, M., Blagotić, A., Shangguan, W., Wright, M. N., Geng, X.,
Bauer-Marschallinger, B., Guevara, M. A., Vargas, R., MacMillan, R. A.,
Batjes, N. H., Leenaars, J. G. B., Ribeiro, E., Wheeler, I., Mantel, S., and
Kempen, B.: SoilGrids250m: Global gridded soil information based on machine
learning, Plos One, 12, 1–40, https://doi.org/10.1371/journal.pone.0169748, 2017.
Hengl, T., Nussbaum, M., Wright, M. N., Heuvelink, G. B. M., and Gräler,
B.: Random forest as a generic framework for predictive modeling of spatial
and spatio-temporal variables, PeerJ, 6, e5518, https://doi.org/10.7717/peerj.5518,
2018.
Hiddink, J. G., Jennings, S., and Kaiser, M. J.: Indicators of the Ecological
Impact of Bottom-Trawl Disturbance on Seabed Communities, Ecosystems, 9,
1190–1199, https://doi.org/10.1007/s10021-005-0164-9, 2006.
Hiddink, J. G., Jennings, S., Sciberras, M., Szostek, C. L., Hughes, K. M.,
Ellis, N., Rijnsdorp, A. D., McConnaughey, R. A., Mazor, T., Hilborn, R.,
Collie, J. S., Pitcher, C. R., Amoroso, R. O., Parma, A. M., Suuronen, P.,
and Kaiser, M. J.: Global analysis of depletion and recovery of seabed biota
after bottom trawling disturbance, P. Natl. Acad. Sci. USA, 114, 8301–8306, https://doi.org/10.1073/pnas.1618858114, 2017.
Huettel, M. and Rusch, A.: Transport and degradation of phytoplankton in
permeable sediment, Limnol. Oceanogr., 45, 534–549,
https://doi.org/10.4319/lo.2000.45.3.0534, 2000.
Huettel, M., Ziebis, W., and Forster, S.: Flow-induced uptake of particulate
matter in permeable sediments, Limnol. Oceanogr., 41, 309–322,
https://doi.org/10.4319/lo.1996.41.2.0309, 1996.
Huettel, M., Roy, H., Precht, E., and Ehrenhauss, S.: Hydrodynamical impact
on biogeochemical processes in aquatic sediments, Hydrobiologia, 494,
231–236, 2003.
Huettel, M., Berg, P., and Kostka, J. E.: Benthic Exchange and Biogeochemical
Cycling in Permeable Sediments, Ann. Rev. Mar. Sci., 6, 23–51,
https://doi.org/10.1146/annurev-marine-051413-012706, 2014.
Huguet, C., Smittenberg, R. H., Boer, W., Sinninghe Damsté, J. S., and
Schouten, S.: Twentieth century proxy records of temperature and soil
organic matter input in the Drammensfjord, southern Norway, Org. Geochem.,
38, 1838–1849, https://doi.org/10.1016/j.orggeochem.2007.06.015, 2007.
Hunt, C., Demšar, U., Dove, D., Smeaton, C., Cooper, R., and Austin, W.
E. N.: Quantifying Marine Sedimentary Carbon: A New Spatial Analysis
Approach Using Seafloor Acoustics, Imagery, and Ground-Truthing Data in
Scotland, Front. Mar. Sci., 7, 588, https://doi.org/10.3389/fmars.2020.00588, 2020.
International Hydrographic Organization: Limits of oceans and seas, IHO
Spec. Publ., 28, 39 pp., 1953.
Jenkins, C.: Sediment Accumulation Rates For the Mississippi Delta Region: a
Time-interval Synthesis, J. Sediment. Res., 88, 301–309,
https://doi.org/10.2110/jsr.2018.15, 2018.
Jennerjahn, T. C.: Relevance and magnitude of “Blue Carbon” storage in
mangrove sediments: Carbon accumulation rates vs. stocks, sources vs. sinks,
Estuar. Coast. Shelf Sci., 247, 107027,
https://doi.org/10.1016/j.ecss.2020.107027, 2020.
Jennings, S., Dinmore, T. A., Duplisea, D. E., Warr, K. J., and Lancaster, J.
E.: Trawling disturbance can modify benthic production processes, J. Anim.
Ecol., 70, 459–475, https://doi.org/10.1046/j.1365-2656.2001.00504.x, 2001.
Jin, D., Hoagland, P., and Buesseler, K. O.: The value of scientific research
on the ocean's biological carbon pump, Sci. Total Environ., 749, 141357,
https://doi.org/10.1016/j.scitotenv.2020.141357, 2020.
Jørgensen, B., Bang, M., and Blackburn, T.: Anaerobic mineralization in
marine sediments from the Baltic Sea-North Sea transition, Mar. Ecol. Prog.
Ser., 59, 39–54, https://doi.org/10.3354/meps059039, 1990.
Jørgensen, B. B.: The sulfur cycle of a coastal marine sediment
(Limfjorden, Denmark)1, Limnol. Oceanogr., 22, 814–832,
https://doi.org/10.4319/lo.1977.22.5.0814, 1977.
Keil, R.: Hoard of fjord carbon, Nat. Geosci., 8, 426, https://doi.org/10.1038/ngeo2433, 2015.
Keil, R.: Anthropogenic Forcing of Carbonate and Organic Carbon Preservation
in Marine Sediments, Ann. Rev. Mar. Sci., 9, 151–172,
https://doi.org/10.1146/annurev-marine-010816-060724, 2017.
Keil, R. G. and Hedges, J. I.: Sorption of organic matter to mineral
surfaces and the preservation of organic matter in coastal marine sediments,
Chem. Geol., 107, 385–388, https://doi.org/10.1016/0009-2541(93)90215-5, 1993.
Köchy, M., Hiederer, R., and Freibauer, A.: Global distribution of soil organic carbon – Part 1: Masses and frequency distributions of SOC stocks for the tropics, permafrost regions, wetlands, and the world, SOIL, 1, 351–365, https://doi.org/10.5194/soil-1-351-2015, 2015.
Krause-Jensen, D. and Duarte, C. M.: Substantial role of macroalgae in
marine carbon sequestration, Nat. Geosci, 9, 737–742, https://doi.org/10.1038/ngeo2790, 2016.
Kursa, M. and Rudnicki, W.: Feature selection with the Boruta Package, J.
Stat. Softw., 36, 1–11, 2010.
LaRowe, D. E., Arndt, S., Bradley, J. A., Burwicz, E., Dale, A. W., and
Amend, J. P.: Organic carbon and microbial activity in marine sediments on a
global scale throughout the Quaternary, Geochim. Cosmochim. Ac., 286,
227–247, https://doi.org/10.1016/j.gca.2020.07.017, 2020.
Lee, T. R., Wood, W. T., and Phrampus, B. J.: A Machine Learning (kNN)
Approach to Predicting Global Seafloor Total Organic Carbon, Global
Biogeochem. Cy., 33, 37–46, https://doi.org/10.1029/2018GB005992, 2019.
Legge, O., Johnson, M., Hicks, N., Jickells, T., Diesing, M., Aldridge, J.,
Andrews, J., Artioli, Y., Bakker, D. C. E., Burrows, M. T., Carr, N.,
Cripps, G., Felgate, S. L., Fernand, L., Greenwood, N., Hartman, S.,
Kröger, S., Lessin, G., Mahaffey, C., Mayor, D. J., Parker, R.,
Queirós, A. M., Shutler, J. D., Silva, T., Stahl, H., Tinker, J.,
Underwood, G. J. C., Van Der Molen, J., Wakelin, S., Weston, K., and
Williamson, P.: Carbon on the Northwest European Shelf: Contemporary Budget
and Future Influences, Front. Mar. Sci., 7, 143,
https://doi.org/10.3389/fmars.2020.00143, 2020.
Leipe, T., Tauber, F., Vallius, H., Virtasalo, J., Uścinowicz, S.,
Kowalski, N., Hille, S., Lindgren, S., and Myllyvirta, T.: Particulate
organic carbon (POC) in surface sediments of the Baltic Sea, Geo-Marine
Lett., 31, 175–188, https://doi.org/10.1007/s00367-010-0223-x, 2011.
Luisetti, T., Turner, R. K., Andrews, J. E., Jickells, T. D., Kröger,
S., Diesing, M., Paltriguera, L., Johnson, M. T., Parker, E. R., Bakker, D.
C. E., and Weston, K.: Quantifying and valuing carbon flows and stores in
coastal and shelf ecosystems in the UK, Ecosyst. Serv., 35, 67–76,
https://doi.org/10.1016/J.ECOSER.2018.10.013, 2019.
Luisetti, T., Ferrini, S., Grilli, G., Jickells, T. D., Kennedy, H.,
Kröger, S., Lorenzoni, I., Milligan, B., van der Molen, J., Parker, R.,
Pryce, T., Turner, R. K., and Tyllianakis, E.: Climate action requires new
accounting guidance and governance frameworks to manage carbon in shelf
seas, Nat. Commun., 11, 4599, https://doi.org/10.1038/s41467-020-18242-w, 2020.
Macreadie, P. I., Anton, A., Raven, J. A., Beaumont, N., Connolly, R. M.,
Friess, D. A., Kelleway, J. J., Kennedy, H., Kuwae, T., Lavery, P. S.,
Lovelock, C. E., Smale, D. A., Apostolaki, E. T., Atwood, T. B., Baldock,
J., Bianchi, T. S., Chmura, G. L., Eyre, B. D., Fourqurean, J. W.,
Hall-Spencer, J. M., Huxham, M., Hendriks, I. E., Krause-Jensen, D.,
Laffoley, D., Luisetti, T., Marbà, N., Masque, P., McGlathery, K. J.,
Megonigal, J. P., Murdiyarso, D., Russell, B. D., Santos, R., Serrano, O.,
Silliman, B. R., Watanabe, K., and Duarte, C. M.: The future of Blue Carbon
science, Nat. Commun., 10, 3998, https://doi.org/10.1038/s41467-019-11693-w, 2019.
Martens, C. S. and Val Klump, J.: Biogeochemical cycling in an organic-rich
coastal marine basin 4. An organic carbon budget for sediments dominated by
sulfate reduction and methanogenesis, Geochim. Cosmochim. Ac., 48,
1987–2004, https://doi.org/10.1016/0016-7037(84)90380-6, 1984.
Martín, J., Puig, P., Palanques, A., and Giamportone, A.: Commercial
bottom trawling as a driver of sediment dynamics and deep seascape evolution
in the Anthropocene, Anthropocene, 7, 1–15,
https://doi.org/10.1016/j.ancene.2015.01.002, 2014a.
Martín, J., Puig, P., Masqué, P., Palanques, A., and
Sánchez-Gómez, A.: Impact of Bottom Trawling on Deep-Sea Sediment
Properties along the Flanks of a Submarine Canyon, Plos One, 9, 1–11,
https://doi.org/10.1371/journal.pone.0104536, 2014b.
Mayer, L. M.: Surface area control of organic carbon accumulation in
continental shelf sediments, Geochim. Cosmochim. Ac., 58, 1271–1284,
https://doi.org/10.1016/0016-7037(94)90381-6, 1994.
McBratney, A. B., Mendonça Santos, M. L., and Minasny, B.: On digital
soil mapping, Geoderma, 117, 3–52, https://doi.org/10.1016/S0016-7061(03)00223-4, 2003.
Mcleod, E., Chmura, G. L., Bouillon, S., Salm, R., Björk, M., Duarte, C.
M., Lovelock, C. E., Schlesinger, W. H., and Silliman, B. R.: A blueprint for
blue carbon: toward an improved understanding of the role of vegetated
coastal habitats in sequestering CO2, Front. Ecol. Environ., 9,
552–560, https://doi.org/10.1890/110004, 2011.
Meinshausen, N.: Quantile Regression Forests, J. Mach. Learn. Res., 7,
983–999, 2006.
Middelburg, J. J.: Carbon Processing at the Seafloor, in Marine Carbon
Biogeochemistry: A Primer for Earth System Scientists, Springer
International Publishing, Cham, 57–75, 2019.
Middelburg, J. J., Soetaert, K., and Herman, P. M. J.: Empirical
relationships for use in global diagenetic models, Deep Sea Res. Part I
Oceanogr. Res. Pap., 44, 327–344, https://doi.org/10.1016/S0967-0637(96)00101-X,
1997.
Minasny, B. and McBratney, A. B.: A conditioned Latin hypercube method for
sampling in the presence of ancillary information, Comput. Geosci., 32,
1378–1388, https://doi.org/10.1016/J.CAGEO.2005.12.009, 2006.
Mitchell, P. J., Aldridge, J., and Diesing, M.: Legacy data: How decades of
seabed sampling can produce robust predictions and versatile products,
Geosciences J., 9, 182, https://doi.org/10.3390/geosciences9040182, 2019a.
Mitchell, P., Aldridge, J., and Diesing, M.: Quantitative sediment composition predictions for the north-west European continental shelf, Cefas, UK, V1, https://doi.org/10.14466/CefasDataHub.63, 2019b.
Mitchell, P., Aldridge, J., and Diesing, M.: Predictor variables and groundtruth samples for north-west European continental shelf quantitative sediment analysis, Cefas, UK, V1, https://doi.org/10.14466/CefasDataHub.62, 2019c.
Mitchell, P. J., Spence, M. A., Aldridge, J., Kotilainen, A. T., and Diesing,
M.: Sedimentation rates in the Baltic Sea: A machine learning approach,
Cont. Shelf Res., 214, 104325,
https://doi.org/10.1016/j.csr.2020.104325, 2021.
Miteva, D. A., Murray, B. C., and Pattanayak, S. K.: Do protected areas
reduce blue carbon emissions? A quasi-experimental evaluation of mangroves
in Indonesia, Ecol. Econ., 119, 127–135,
https://doi.org/10.1016/j.ecolecon.2015.08.005, 2015.
Müller, A.: Geochemical expressions of anoxic conditions in
Nordåsvannet, a land-locked fjord in western Norway, Appl. Geochemistry,
16, 363–374, https://doi.org/10.1016/S0883-2927(00)00024-X, 2001.
Müller, P. J. and Suess, E.: Productivity, sedimentation rate, and
sedimentary organic matter in the oceans – I. Organic carbon preservation,
Deep Sea Res. Pt. A., 26, 1347–1362,
https://doi.org/10.1016/0198-0149(79)90003-7, 1979.
Najjar, R. G., Herrmann, M., Alexander, R., Boyer, E. W., Burdige, D. J.,
Butman, D., Cai, W.-J., Canuel, E. A., Chen, R. F., Friedrichs, M. A. M.,
Feagin, R. A., Griffith, P. C., Hinson, A. L., Holmquist, J. R., Hu, X.,
Kemp, W. M., Kroeger, K. D., Mannino, A., McCallister, S. L., McGillis, W.
R., Mulholland, M. R., Pilskaln, C. H., Salisbury, J., Signorini, S. R.,
St-Laurent, P., Tian, H., Tzortziou, M., Vlahos, P., Wang, Z. A., and
Zimmerman, R. C.: Carbon Budget of Tidal Wetlands, Estuaries, and Shelf
Waters of Eastern North America, Global Biogeochem. Cy., 32, 389–416,
https://doi.org/10.1002/2017GB005790, 2018.
Nellemann, C., Corcoran, E., Duarte, C. M., Valdés, L., De Young, C.,
Fonseca, L., and Grimsditch, G.: Blue Carbon: The Role of Healthy Oceans in
Binding Carbon: A Rapid Response Assessment, available at:
https://www.grida.no/publications/145 (last access: 22 March 2021), 2009.
Nordberg, K., Filipsson, H. L., Gustafsson, M., Harland, R., and Roos, P.:
Climate, hydrographic variations and marine benthic hypoxia in Koljö
Fjord, Sweden, J. Sea Res., 46, 187–200,
https://doi.org/10.1016/S1385-1101(01)00084-3, 2001.
Nordberg, K., Filipsson, H. L., Linné, P., and Gustafsson, M.: Stable
oxygen and carbon isotope information on the establishment of a new,
opportunistic foraminiferal fauna in a Swedish Skagerrak fjord basin, in
1979/1980, Mar. Micropaleontol., 73, 117–128,
https://doi.org/10.1016/j.marmicro.2009.07.006, 2009.
Oberle, F. K. J., Storlazzi, C. D., and Hanebuth, T. J. J.: What a drag:
Quantifying the global impact of chronic bottom trawling on continental
shelf sediment, J. Mar. Syst., 159, 109–119,
https://doi.org/10.1016/j.jmarsys.2015.12.007, 2016.
Palanques, A., Puig, P., Guillén, J., Demestre, M., and Martín, J.:
Effects of bottom trawling on the Ebro continental shelf sedimentary system
(NW Mediterranean), Cont. Shelf Res., 72, 83–98,
https://doi.org/10.1016/j.csr.2013.10.008, 2014.
Paradis, S., Pusceddu, A., Masqué, P., Puig, P., Moccia, D., Russo, T., and Lo Iacono, C.: Organic matter contents and degradation in a highly trawled area during fresh particle inputs (Gulf of Castellammare, southwestern Mediterranean), Biogeosciences, 16, 4307–4320, https://doi.org/10.5194/bg-16-4307-2019, 2019.
Paradis, S., Goñi, M., Masqué, P., Durán, R., Arjona-Camas, M.,
Palanques, A., and Puig, P.: Persistence of Biogeochemical Alterations of
Deep-Sea Sediments by Bottom Trawling, Geophys. Res. Lett., 48 ,
e2020GL091279, https://doi.org/10.1029/2020GL091279, 2020.
Paropkari, A. L., Prakash Babu, C., and Mascarenhas, A.: A critical
evaluation of depositional parameters controlling the variability of organic
carbon in Arabian Sea sediments, Mar. Geol., 107, 213–226,
https://doi.org/10.1016/0025-3227(92)90168-H, 1992.
Precht, E. and Huettel, M.: Advective pore-water exchange driven by surface
gravity waves and its ecological implications, Limnol. Oceanogr., 48,
1674–1684, 2003.
Pusceddu, A., Fiordelmondo, C., Polymenakou, P., Polychronaki, T.,
Tselepides, A., and Danovaro, R.: Effects of bottom trawling on the quantity
and biochemical composition of organic matter in coastal marine sediments
(Thermaikos Gulf, northwestern Aegean Sea), Cont. Shelf Res., 25,
2491–2505, https://doi.org/10.1016/j.csr.2005.08.013, 2005.
Pusceddu, A., Bianchelli, S., Martín, J., Puig, P., Palanques, A.,
Masqué, P., and Danovaro, R.: Chronic and intensive bottom trawling
impairs deep-sea biodiversity and ecosystem functioning, P. Natl. Acad.
Sci. USA, 111, 8861–8866, https://doi.org/10.1073/pnas.1405454111, 2014.
R Core Team: R: A Language and Environment for Statistical Computing, R Foundation for Statistical Computing, Vienna, Austria, available at: https://www.r-project.org/ (last access: 23 March 2021), 2018.
Roberts, C. M., O'Leary, B. C., McCauley, D. J., Cury, P. M., Duarte, C. M.,
Lubchenco, J., Pauly, D., Sáenz-Arroyo, A., Sumaila, U. R., Wilson, R.
W., Worm, B., and Castilla, J. C.: Marine reserves can mitigate and promote
adaptation to climate change, P. Natl. Acad. Sci. USA, 114, 6167–6175, https://doi.org/10.1073/pnas.1701262114, 2017.
Seiter, K., Hensen, C., Schröter, J., and Zabel, M.: Organic carbon
content in surface sediments–defining regional provinces, Deep Sea Res.
Pt. I, 51, 2001–2026, https://doi.org/10.1016/j.dsr.2004.06.014, 2004.
Skei, J.: Geochemical and sedimentological considerations of a permanently
anoxic fjord – Framvaren, south Norway, Sediment. Geol., 36, 131–145,
https://doi.org/10.1016/0037-0738(83)90006-4, 1983.
Smeaton, C. and Austin, W. E. N.: Where's the Carbon: Exploring the Spatial
Heterogeneity of Sedimentary Carbon in Mid-Latitude Fjords, Front. Earth
Sci., 7, 269, https://doi.org/10.3389/feart.2019.00269, 2019.
Smeaton, C., Austin, W. E. N., Davies, A. L., Baltzer, A., Abell, R. E., and Howe, J. A.: Substantial stores of sedimentary carbon held in mid-latitude fjords, Biogeosciences, 13, 5771–5787, https://doi.org/10.5194/bg-13-5771-2016, 2016.
Smeaton, C., Austin, W. E. N., Davies, A. L., Baltzer, A., Howe, J. A., and Baxter, J. M.: Scotland's forgotten carbon: a national assessment of mid-latitude fjord sedimentary carbon stocks, Biogeosciences, 14, 5663–5674, https://doi.org/10.5194/bg-14-5663-2017, 2017.
Smittenberg, R. H., Pancost, R. D., Hopmans, E. C., Paetzel, M., and
Sinninghe Damsté, J. S.: A 400-year record of environmental change in an
euxinic fjord as revealed by the sedimentary biomarker record, Palaeogeogr.
Palaeoclimatol. Palaeoecol., 202, 331–351,
https://doi.org/10.1016/S0031-0182(03)00642-4, 2004.
Smittenberg, R. H., Baas, M., Green, M. J., Hopmans, E. C., Schouten, S., and
Sinninghe Damsté, J. S.: Pre- and post-industrial environmental changes
as revealed by the biogeochemical sedimentary record of Drammensfjord,
Norway, Mar. Geol., 214, 177–200,
https://doi.org/10.1016/j.margeo.2004.10.029, 2005.
Steen, A. D., Quigley, L. N. M., and Buchan, A.: Evidence for the Priming
Effect in a Planktonic Estuarine Microbial Community, Front. Mar. Sci., 3,
6, https://doi.org/10.3389/fmars.2016.00006, 2016.
Stevens Jr, D. L. and Olsen, A. R.: Variance estimation for spatially
balanced samples of environmental resources, Environmetrics, 14,
593–610, https://doi.org/10.1002/env.606, 2003.
Thornton, S. F. and McManus, J.: Application of Organic Carbon and Nitrogen
Stable Isotope and C/N Ratios as Source Indicators of Organic Matter
Provenance in Estuarine Systems: Evidence from the Tay Estuary, Scotland,
Estuar. Coast. Shelf Sci., 38, 219–233,
https://doi.org/10.1006/ecss.1994.1015, 1994.
Tillin, H. M., Hiddink, J. G., Jennings, S., and Kaiser, M. J.: Chronic
bottom trawling alters the functional composition of benthic invertebrate
communities on a sea-basin scale, Mar. Ecol. Prog. Ser., 318, 31–45,
https://doi.org/10.3354/meps318031, 2006.
Tyberghein, L., Verbruggen, H., Pauly, K., Troupin, C., Mineur, F., and De
Clerck, O.: Bio-ORACLE: a global environmental dataset for marine species
distribution modelling, Glob. Ecol. Biogeogr., 21, 272–281,
https://doi.org/10.1111/j.1466-8238.2011.00656.x, 2012.
van de Velde, S., Van Lancker, V., Hidalgo-Martinez, S., Berelson, W. M., and
Meysman, F. J. R.: Anthropogenic disturbance keeps the coastal seafloor
biogeochemistry in a transient state, Sci. Rep.-UK, 8, 5582,
https://doi.org/10.1038/s41598-018-23925-y, 2018.
Velinsky, D. J., and Fogel, M. L.: Cycling of dissolved and particulate
nitrogen and carbon in the Framvaren Fjord, Norway: stable isotopic
variations, Mar. Chem., 67, 161–180,
https://doi.org/10.1016/S0304-4203(99)00057-2, 1999.
van der Voort, T. S., Blattmann, T. M., Usman, M., Montluçon, D., Loeffler, T., Tavagna, M. L., Gruber, N., and Eglinton, T. I.: MOSAIC (Modern Ocean Sediment Archive and Inventory of Carbon): A (radio)carbon-centric database for seafloor surficial sediments, Earth Syst. Sci. Data Discuss. [preprint], https://doi.org/10.5194/essd-2020-199, in review, 2020.
van Weering, T. C. E., Berger, G. W., and Okkels, E.: Sediment transport,
resuspension and accumulation rates in the northeastern Skagerrak, Mar.
Geol., 111, 269–285, https://doi.org/10.1016/0025-3227(93)90135-I,
1993.
Van Weering, T. C. E.: Recent Sediments and Sediment Transport in the Northern North Sea: Surface Sediments of the Skagerrak, in: Holocene Marine Sedimentation in the North Sea Basin, edited by: Nio, S.‐D., Schüttenhelm, R. T. E., and Van Weering, T. C. E., Spec. Publ. Int. Assoc. Sedimentol., 5, 335–359, John Wiley & Sons, Ltd., Chichester, UK, 1981.
Williams, M. E., Amoudry, L. O., Brown, J. M., and Thompson, C. E. L.: Fine
particle retention and deposition in regions of cyclonic tidal current
rotation, Mar. Geol., 410, 122–134,
https://doi.org/10.1016/j.margeo.2019.01.006, 2019.
Wilson, R. J., Speirs, D. C., Sabatino, A., and Heath, M. R.: A synthetic map of the north-west European Shelf sedimentary environment for applications in marine science, Earth Syst. Sci. Data, 10, 109–130, https://doi.org/10.5194/essd-10-109-2018, 2018.
Zarate-Barrera, T. G. and Maldonado, J. H.: Valuing Blue Carbon: Carbon
Sequestration Benefits Provided by the Marine Protected Areas in Colombia,
Plos One, 10, e0126627,
https://doi.org/10.1371/journal.pone.0126627, 2015.
Zhang, W., Wirtz, K., Daewel, U., Wrede, A., Kröncke, I., Kuhn, G.,
Neumann, A., Meyer, J., Ma, M., and Schrum, C.: The Budget of Macrobenthic
Reworked Organic Carbon: A Modeling Case Study of the North Sea, J. Geophys.
Res.-Biogeosci., 124, 1446–1471, https://doi.org/10.1029/2019JG005109, 2019.
Zuo, Z., Eisma, D., and Berger, G. W.: Recent sediment deposition rates in
the oyster ground, North Sea, Netherlands J. Sea Res., 23, 263–269,
https://doi.org/10.1016/0077-7579(89)90047-1, 1989.
Short summary
The upper 10 cm of the seafloor of the North Sea and Skagerrak contain 231×106 t of carbon in organic form. The Norwegian Trough, the deepest sedimentary basin in the studied area, stands out as a zone of strong organic carbon accumulation with rates on par with neighbouring fjords. Conversely, large parts of the North Sea are characterised by rapid organic carbon degradation and negligible accumulation. This dual character is likely typical for continental shelf sediments worldwide.
The upper 10 cm of the seafloor of the North Sea and Skagerrak contain 231×106 t of carbon in...
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