A5012745501- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Indigenous Studies and Ecology
- Geophysics and Gravity Measurements
- Geology and Paleoclimatology Research
- Smart Materials for Construction
- High voltage insulation and dielectric phenomena
- Clinical Nutrition and Gastroenterology
- Oceanographic and Atmospheric Processes
- Offshore Engineering and Technologies
- Healthcare Systems and Challenges
- Thermal Analysis in Power Transmission
- Icing and De-icing Technologies
- Scientific Research and Discoveries
- Arctic and Russian Policy Studies
- Distributed and Parallel Computing Systems
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2019-2025
University of Oslo
2024-2025
Gesellschaft für wissenschaftliche Datenverarbeitung mbH Göttingen
2015-2016
University of Bremen
2015
Abstract. The Siberian Arctic is warming rapidly, causing permafrost to thaw and altering the biogeochemistry of aquatic environments, with cascading effects on coastal shelf ecosystems Ocean. Lena River, one largest rivers, drains a catchment dominated by permafrost. Baseline discharge data are necessary understand present future changes in land-to-ocean fluxes. Here, we high-frequency 4.5-year-long dataset from sampling program River's biogeochemistry, spanning April 2018 August 2022....
Abstract Offshore permafrost plays a role in the global climate system, but observations of thickness, state, and composition are limited to specific regions. The current map shows potential offshore distribution based on bathymetry sea level rise. As first‐order estimate, we employ heat transfer model calculate subsurface temperature field. Our uses dynamic upper boundary conditions that synthesize Earth System Model air temperature, ice mass reconstruction applies globally distributed...
Abstract. The CryoGrid community model is a flexible toolbox for simulating the ground thermal regime and ice–water balance permafrost glaciers, extending well-established suite of models (CryoGrid 1, 2, 3). can accommodate wide variety application scenarios, which achieved by fully modular structures through object-oriented programming. Different components, characterized their process representations parameterizations, are realized as classes (i.e., objects) in CryoGrid. Standardized...
Abstract Submarine permafrost is perennially cryotic earth material that lies offshore. Most submarine relict terrestrial beneath the Arctic shelf seas, was inundated after last glaciation, and has been warming thawing ever since. As a reservoir confining layer for gas hydrates, it potential to release greenhouse gasses impact coastal infrastructure, but its distribution rate of thaw are poorly constrained by observational data. Lengthening summers, reduced sea ice extent increased solar...
Abstract. The CryoGrid community model is a flexible toolbox for simulating the ground thermal regime and ice/water balance permafrost glaciers, extending well-established suite of models (CryoGrid 1, 2 3). can accommodate wide variety application scenarios, which achieved by fully modular structures through object-oriented programming. Different components, characterized their process representations parametrizations, are realized as classes (i.e. objects) in CryoGrid. Standardized...
Abstract Subsea permafrost carbon pools below the Arctic shelf seas are a major unknown in global cycle. We combine numerical model of sedimentation and evolution with simplified turnover to estimate accumulation microbial decomposition organic matter on pan-Arctic over past four glacial cycles. find that is globally important long-term sink storing 2822 (1518–4982) Pg OC, double amount stored lowland permafrost. Although currently thawing, prior aging limit rates less than 48 Tg OC/yr...
Arctic deltas and their river channels are characterized by three components of the cryosphere: snow, ice, permafrost, making them especially sensitive to ongoing climate change. Thinning ice rising water temperatures may affect thermal state permafrost beneath riverbed, with consequences for delta hydrology, erosion, sediment transport. In this study, we use optical radar remote sensing map frozen riverbed (bedfast ice) vs. resting on top unfrozen layer (floating or so-called serpentine...
Abstract. Most earth system models (ESMs) neglect climate feedbacks arising from carbon release thawing permafrost, especially of subsea permafrost (SSPF). To assess the fate SSPF in next 1000 years, we implemented into JSBACH, land component Max Planck Institute Earth System Model (MPI-ESM). This is first implementation processes an ESM component. We investigate three extended scenarios 6th phase Coupled Intercomparison Project (CMIP6). In 21st century only small differences are found among...
Analytical and 2D finite-element solutions of the heat transfer equation are used to model temperature evolution in upper 15 m marine sediment deposits. These calculations comprise realistic, in-situ measured, thermal properties as well natural (geothermal sea bottom temperature) man-made (e.g. high voltage, subsea power cables) sources. A main objective this article is focus on influence heterogeneity sediments North Baltic Seas. In combination with seasonal variations water temperatures,...
Sea-level rise submerges terrestrial permafrost in the Arctic, turning it into subsea permafrost. Subsea underlies ~ 1.8 million km2 of Arctic continental shelf, with thicknesses places exceeding 700 m. variations over glacial-interglacial cycles control distribution and thickness, yet no model has accounted for glacial isostatic adjustment (GIA), which deviates local sea level from global mean due to changes ice ocean loading. Here we incorporate GIA a pan-Arctic last 400,000 years....
Abstract. Most Earth System Models (ESMs) neglect climate feedbacks arising from carbon release thawing permafrost, especially of sub-sea permafrost (SSPF). To assess the fate SSPF in next 1000 years, we implemented into JSBACH, land component Max Planck Institute Model (MPI-ESM). This is first implementation processes an ESM-component. We investigate three extended scenarios 6th phase Coupled Intercomparison Project (CMIP6). In 21st century only small differences are found among scenarios,...
Reconstructing historical climate change from deep ground temperature measurements in cold regions is often complicated by the presence of permafrost. Existing methods are typically unable to account for latent heat effects due freezing and thawing active layer. In this work, we propose a novel method reconstructing surface temperatures (GST) borehole that accounts seasonal refreezing Our couples recently developed fast numerical modeling scheme two-phase transport permafrost soils with an...
Abstract. The thermal regime in the sediment column below shallow bodies of water Arctic permafrost controls benthic habitats and stability. We present a robust, portable device that measures detailed temperature–depth profiles near-surface sediments less than 1 h. Test campaigns Canadian on Svalbard have demonstrated its utility range environments during winter summer. Measured temperatures were spatially heterogeneous, even within single water. observed broadest temperature m deep, zone is...
Abstract Reconstructing historical climate change from deep ground temperature measurements in cold regions is often complicated by the presence of permafrost. Existing methods are typically unable to account for latent heat effects due freezing and thawing active layer. In this work, we propose a novel method reconstructing surface (GST) borehole that accounts seasonal refreezing Our couples recently developed fast numerical modeling scheme two‐phase transport permafrost soils with an...
Abstract. The Siberian Arctic is warming rapidly, causing permafrost to thaw and altering the biogeochemistry of aquatic environments, with cascading effects on coastal shelf ecosystems Ocean. Lena River, one largest rivers, drains a catchment dominated by permafrost. Baseline discharge data necessary understand present future changes in land-to-ocean fluxes. Here, we high-frequency, 4.5-year-long dataset from sampling program River’s biogeochemistry, spanning April 2018 August 2022....
Saline permafrost is primarily found in marine deposits beneath shallow shelf seas and can often extend several kilometres inland from present Arctic coastlines. On land, saline forms when previously submerged sediments are exposed to the atmosphere, either through a sea level regression or post-glacial rebound. Cryopegs perennially cryotic layers pockets within that remain unfrozen due their high salt content. While heat flow models have been applied study subsea degradation, adapting these...
Sea-level rise submerges terrestrial permafrost in the Arctic, turning it into subsea permafrost. Subsea underlies ∼1.8 million km^2 of Arctic continental shelf, with thicknesses places exceeding 700 m. variations over glacial-interglacial cycles control distribution and thickness, yet no model has accounted for glacial isostatic adjustment (GIA), which deviates local sea level from global mean due to changes ice ocean loading. We incorporate GIA a pan-Arctic last 400,000 years. Including...
Supplement 1: Quick start for CryoGrid community model Software requirements: is written in Matlab, version 2018 or higher required.For parallel applications, the Matlab toolbox required.1.1 Download and set up file structure a) select create a folder code results, e.g."CryoGrid_git" -download zip-file with source code, CryoGridCommunity_source.zip,
Abstract. Continuous monitoring of oceanic bottom water temperatures is a complicated task, even in relatively easy-to-access basins like the North or Baltic seas. Here, method to determine annual temperature variations from inverse modeling instantaneous measurements and sediment thermal properties presented. This concept similar climate reconstructions over several thousand years deep borehole data. However, contrast, presented aims at reconstructing recent history last year only few...
Abstract. Temperature fields in marine sediments are studied for various purposes. Often, the target of research is steady state heat flow as a (possible) source energy but there also studies attempting to reconstruct bottom water temperature variations understand more about climate history. The propagates into sediment different depths, depending on amplitude and period deviation. can only be determined when constant while history reconstructed deviation has an large enough or measurements...