A5083844825- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Marine and environmental studies
- Climate change and permafrost
- Geological Studies and Exploration
- Geological formations and processes
- Polar Research and Ecology
- Arctic and Antarctic ice dynamics
- Winter Sports Injuries and Performance
University of Bremen
2021-2024
Durham University
2015-2017
UiT The Arctic University of Norway
2015
High-resolution swath-bathymetry data from inner Kongsfjorden, Svalbard, reveal characteristic landform assemblages formed during and after surges of tidewater glaciers, provide new insights into the dynamics surging glaciers. Glacier front oscillations overriding related to surge activity lead formation overridden moraines, glacial lineations two types, terminal associated debris lobes De Geer moraines. In contrast submarine other Svalbard fjords, occurrence kinds presence moraines suggest...
A digital database for submarine glacial landforms and sediments formed in the Arctic during since Last Glacial Maximum was created order to facilitate underpin new research on palaeo‐ice sheets tidewater glacier dynamics. The glacimarine (GlaciDat) documents standardises evidence of previous activity as visible contemporary seafloor fjords continental shelves around Svalbard, Greenland, Alaska, northern Russia north 66°30′N Canada Norway. An extensive literature search conducted create...
Oceanic spreading centers north of Iceland are characterized by ultraslow rates, and related hydrothermal activity has been detected in the water column at seafloor along nearly all ridge segments. An exception is 500-km-long Knipovich Ridge, from where, until now, no vents were known. Here we report investigation first vent field which was discovered July 2022 during expedition MSM109. The newly field, named Jøtul associated with eastern bounding fault rift valley rather than an axial...
South Georgia, one of the largest sub-Antarctic islands, is located within Southern Ocean and influenced by moisture-supplying Westerlies Antarctic Circumpolar Current, which are highly susceptible to Hemisphere climate variability. Its unique location causes Georgia's remaining ice masses react sensitively change, resulting in dynamic cap waxing waning, as well geomorphological sedimentological changes on island its continental shelf. Sediments around have been archiving this behaviour...
Acoustically stratified sediments that infill glacially eroded bedrock basins are common in fjords (Seramur et al. 1997; Gilbert 1998; Hogan 2012; Dowdeswell & Vasquez 2013). Internally, such often characterized by relatively smooth reflections parallel the seafloor. Sills between usually comprise bedrock, sometimes covered a thin veneer of glacimarine sediment and/or till. Fjords West Greenland, including Rink Fjord and Vaigat, contain infilled acoustically (Fig. 1). The basin fills product...
In an effort to elucidate important part of the Quaternary evolution sub-Antarctic South Georgia, hydroacoustic data from its southern continental shelf are presented. The island with surrounding is key interest for climate reconstructions, because it located within core belt Southern Westerlies and between main fronts Antarctic Circumpolar Current in Ocean. This makes particularly susceptible changes conditions on a local, regional, but also Hemisphere-wide scale. provide new insights into...
Marine geophysical data combined with radiocarbon dated sediment cores provide a record of the advance and retreat ancestral Northeast Greenland Ice Stream (NEGIS) across continental shelf offshore NE during last glaciation. Today, NEGIS is largest ice stream to drain Sheet (GrIS), holding sea-level equivalent 1.1-1.4 m. However, longer-term history stream, especially on adjoining outer has, date, been poorly constrained. Streamlined subglacial landforms grounded flow in section cross...
The glaciated island of South Georgia in the sub-Antarctic is a key area for climate reconstructions, because it positioned Southern Ocean amidst core belt Westerlies and main fronts Antarctic Circumpolar Current. This makes particularly susceptible to changes local, regional, but also Hemisphere-wide conditions. Marine-geological records recovered from its continental shelf therefore offer unique potential constrain how ice masses this part responded Quaternary change, despite this, little...
<p>A new digital database compiling glacial landforms and sediments in the High Arctic was created order to facilitate underpin research on palaeo-ice sheets tidewater glacier dynamics. The is a geographic information system (GIS) format will be available for web download when published. It documents evidence of previous activity as visible contemporary seafloor fjords continental shelves around all Svalbard, Greenland, Alaska, north 66°30’ N Russia,...
The climate in the South Atlantic sector of sub-Antarctic, and therefore on around Georgia island, is dependent Southern Hemisphere Westerlies (SHW) Antarctic Circumpolar Current (ACC), which, turn, are strongly associated with variability Hemisphere. Accordingly, thick sediment sequences troughs across Georgia’s continental shelf should archive past Ocean. Since Holocene fluctuations led to only minimal oscillations glacier margin positions within fjords, entire was exposed dynamic ocean...
The climate in the South Atlantic sector of sub-Antarctic, and therefore on around island Georgia, is dependent Southern Hemisphere Westerlies (SHW) Antarctic Circumpolar Current (ACC). SHW ACC turn, are strongly controlled by variability Hemisphere. Accordingly, thick sediment sequences troughs across Georgia's continental shelf serve as valuable archives for past variations Ocean. Since Holocene fluctuations led to only minimal oscillations glacier margin positions within fjords, entire...
<p>The ice cap of the sub-Antarctic island South Georgia is influenced by Antarctic Circumpolar Current and hence more sensitive to changing climate than significantly larger isolated sheets. Furthermore, sediment deposits in fjords glacially eroded troughs around have superbly archived glacier behavior, environmental climatic changes since late Pleistocene. This makes an attractive target study past variability Southern Hemisphere. Nevertheless, sheet’s extents...