Klaus Wallmann
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View article: Natural ocean alkalinization through erosion of glacial till and weathering at the seafloor
Natural ocean alkalinization through erosion of glacial till and weathering at the seafloor Open
The ocean absorbs about 25% of anthropogenic carbon dioxide emissions, with this uptake regulated by acid-neutralizing anions collectively termed alkalinity. Most seawater alkalinity originates from the weathering of aluminosilicate and ca…
View article: NN-TOC v1: global prediction of total organic carbon in marine sediments using deep neural networks
NN-TOC v1: global prediction of total organic carbon in marine sediments using deep neural networks Open
Spatial predictions of total organic carbon (TOC) concentrations and stocks are crucial for understanding marine sediments’ role as a significant carbon sink in the global carbon cycle. In this study, we present a geospatial prediction of …
View article: Assessing, protecting and restoring the natural carbon storage capacity of marine sediments – the need for enhanced transdisciplinary dialogue and cooperation
Assessing, protecting and restoring the natural carbon storage capacity of marine sediments – the need for enhanced transdisciplinary dialogue and cooperation Open
As global warming progresses, sedimentary carbon sinks are becoming increasingly important in climate change mitigation measures. Thus, there is a need for in-depth knowledge of both the dynamics and vulnerabilities of the sedimentary carb…
View article: Sediment resuspension in muddy sediments enhances pyrite oxidation and carbon dioxide emissions in Kiel Bight
Sediment resuspension in muddy sediments enhances pyrite oxidation and carbon dioxide emissions in Kiel Bight Open
Sediment resuspension of blue carbon ecosystems (e.g., seagrass beds) and muddy sediments exposes buried particulate organic carbon to oxygenated waters and remineralization, potentially enhancing carbon dioxide fluxes. However, the kineti…
View article: Calcite is an efficient and low-cost material to enhance benthic weathering in shelf sediments of the Baltic Sea
Calcite is an efficient and low-cost material to enhance benthic weathering in shelf sediments of the Baltic Sea Open
Recent studies have proposed calcite and dunite as possible alkaline materials for enhanced benthic weathering in shallow depocenters of the Baltic Sea as a marine carbon dioxide removal strategy. In this study, insights on calcite and dun…
View article: CDRmare Insights: CO2 storage deep below the German North Sea: The seven most important outcomes of GEOSTOR research
CDRmare Insights: CO2 storage deep below the German North Sea: The seven most important outcomes of GEOSTOR research Open
For the past three years, experts from the CDRmare research consortium GEOSTOR have been investigating where and how captured carbon dioxide (CO₂) could be safely and permanently stored in the deep seabed under the German North Sea, and wh…
View article: Long-term carbon storage in shelf sea sediments reduced by intensive bottom trawling
Long-term carbon storage in shelf sea sediments reduced by intensive bottom trawling Open
Bottom trawling represents the most widespread anthropogenic physical disturbance to seafloor sediments on continental shelves. While trawling-induced changes to benthic ecology have been widely recognized, the impacts on long-term organic…
View article: Seafloor alkalinity enhancement as a carbon dioxide removal strategy in the Baltic Sea
Seafloor alkalinity enhancement as a carbon dioxide removal strategy in the Baltic Sea Open
Carbon dioxide removal from the atmosphere and storage over long times scales in terrestrial and marine reservoirs is urgently needed to limit global warming and for sustainable management of the global carbon cycle. Ocean alkalinity enhan…
View article: The gas hydrate system of the western Black Sea Basin
The gas hydrate system of the western Black Sea Basin Open
The basin-scale distribution of gas hydrates and methane migration pathways in the western Black Sea remains enigmatic, owing to the region's complex geological history. Characterizing the abundant gas hydrate accumulations across temporal…
View article: Provenance of clay-sized detrital sediments in the North Sea and the Skagerrak region based on radiogenic Nd-Sr-Hf isotopes and clay mineral compositions: assessing the impact of coastal and seabed erosion
Provenance of clay-sized detrital sediments in the North Sea and the Skagerrak region based on radiogenic Nd-Sr-Hf isotopes and clay mineral compositions: assessing the impact of coastal and seabed erosion Open
The Skagerrak basin represents the main sink area for fine-grained sediment in the North Sea region and constitutes a natural deposition center for sediments that are supplied from the Atlantic, the Baltic Sea and the surrounding continent…
View article: NN-TOC v1: global prediction of total organic carbon in marine sediments using deep neural networks
NN-TOC v1: global prediction of total organic carbon in marine sediments using deep neural networks Open
Spatial predictions of total organic carbon (TOC) concentrations and stocks are crucial for understanding marine sediments’ role as a significant carbon sink in the global carbon cycle. In this study, we present a geospatial prediction of …
View article: Exploring site-specific carbon dioxide removal options with storage or sequestration in the marine environment - The 10 Mt CO2 yr-1 removal challenge for Germany
Exploring site-specific carbon dioxide removal options with storage or sequestration in the marine environment - The 10 Mt CO2 yr-1 removal challenge for Germany Open
Marine carbon dioxide removal (mCDR) and geological carbon storage in the marine environment (mCS) promise to contribute to the mitigation of global climate change in combination with drastic emission reductions. However, the implementable…
View article: Assessing the sedimentary carbon sink for climate change mitigation - the need for transdisciplinary cooperation
Assessing the sedimentary carbon sink for climate change mitigation - the need for transdisciplinary cooperation Open
Shelf sediments represent one of the largest natural carbon sinks on earth. At the same time, shelf regions are increasingly affected by human activity, disturbing sediment reservoirs directly by bottom trawling and offshore construction, …
View article: Predicting Global Seafloor Organic Carbon Burial Rates: A Deep Learning Approach with Uncertainty Quantification
Predicting Global Seafloor Organic Carbon Burial Rates: A Deep Learning Approach with Uncertainty Quantification Open
Sediment accumulation rate is recognized as the primary parameter influencing the burial rate of organic carbon and other compounds in marine sediments. The prediction of a global map for burial rates is challenging due to the limited avai…
View article: Data Bridges: Modeling Marine Science Information to Heterogeneous Information Network for Research Data Management
Data Bridges: Modeling Marine Science Information to Heterogeneous Information Network for Research Data Management Open
Research Data Management (RDM) in Natural Science establishes a structured foundation for organizing and preserving scientific data. Effective management and access to these diverse data sources are crucial for supporting domain scientists…
View article: Gas hydrate precipitation and microbial transformation affect the composition of gases migrating through sediments drilled off SW Taiwan
Gas hydrate precipitation and microbial transformation affect the composition of gases migrating through sediments drilled off SW Taiwan Open
Molecular and stable isotopic compositions of light (C1–C3) hydrocarbons in sediments provide information on their formation pathways and postgenetic alterations. In 2018, gas hydrate-bearing sediment cores and borehole logging data …
View article: Sedimentation rate decrease in the Skagerrak and its implication for human and natural impacts in the North Sea
Sedimentation rate decrease in the Skagerrak and its implication for human and natural impacts in the North Sea Open
Since industrial times, human and natural processes have affected the sediment system of the North Sea. As a substantial proportion of the suspended sediment in the North Sea is ultimately deposited in the Skagerrak, it offers a representa…
View article: Exploring Carbon Sequestration through Mineral Carbonation in Serpentinite Mud Volcanoes
Exploring Carbon Sequestration through Mineral Carbonation in Serpentinite Mud Volcanoes Open
Mineral carbonation is a sequence of natural processes that can be summarized as a net reaction of carbon dioxide (CO2) with metal-bearing minerals, producing stable carbonates. The rapid increase in anthropogenic CO2 emissions has created…
View article: Modelling mass accumulation rates and 210Pb rain rates in the Skagerrak: lateral sediment transport dominates the sediment input
Modelling mass accumulation rates and 210Pb rain rates in the Skagerrak: lateral sediment transport dominates the sediment input Open
Sediment fluxes to the seafloor govern the fate of elements and compounds in the ocean and serve as a prerequisite for research on elemental cycling, benthic processes and sediment management strategies. To quantify these fluxes over seafl…
View article: Alkaline mineral addition to anoxic to hypoxic Baltic Sea sediments as a potentially efficient CO2-removal technique
Alkaline mineral addition to anoxic to hypoxic Baltic Sea sediments as a potentially efficient CO2-removal technique Open
Recent studies have begun to explore the potential of enhanced benthic weathering (EBW) in the Baltic Sea as a measure for climate change mitigation. To augment the understanding of EBW under seasonally changing conditions, this study aims…
View article: Methane-carbon budget of a ferruginous meromictic lake and implications for marine methane dynamics on early Earth
Methane-carbon budget of a ferruginous meromictic lake and implications for marine methane dynamics on early Earth Open
The greenhouse gas methane (CH4) contributed to a warm climate that maintained liquid water and sustained Earth’s habitability in the Precambrian despite the faint young sun. The viability of methanogenesis (ME) in ferruginous environments…
View article: Global Prediction Of Total Organic Carbon In Marine Sediments Using (Software) Deep Neural Networks (nn-toc)
Global Prediction Of Total Organic Carbon In Marine Sediments Using (Software) Deep Neural Networks (nn-toc) Open
We create a deep neural network based approach for the geospatial predicition of total organic carbon percentages in marine sediments. The code in the repository includes jupyter notebooks and python files to pre-process the data, train th…
View article: Degradation and accumulation of organic matter in euxinic surface sediments
Degradation and accumulation of organic matter in euxinic surface sediments Open
The impact of oxygen on the preservation of organic matter in marine surface sediments is still controversial. We revisited this long-standing debate by determining the burial efficiency of sedimentary organic matter in the Black Sea, the …
View article: Quantification of mixed hydrate and free gas concentrations by the joint integration of velocity and conductivity information
Quantification of mixed hydrate and free gas concentrations by the joint integration of velocity and conductivity information Open
Highlights
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\n • The developed joint inversion quantifies both free gas and hydrate concentration.
\n • The robust method uses sonic and conductivity logs as main input parameters.
\n • For the test site it reveals two hydrate accumulati…