Daniela Jansen
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View article: Radar Polarimetry in Glaciology: Theory, Measurement Techniques, and Scientific Applications for Investigating the Anisotropy of Ice Masses
Radar Polarimetry in Glaciology: Theory, Measurement Techniques, and Scientific Applications for Investigating the Anisotropy of Ice Masses Open
Dielectric anisotropy in ice alters the propagation of polarized radio waves, so polarimetric radar sounding can be used to survey anisotropic properties of ice masses. Ice anisotropy is either intrinsic, associated with ice‐crystal orient…
View article: Formation of mega-scale glacial lineations far inland beneath the onset of the Northeast Greenland Ice Stream
Formation of mega-scale glacial lineations far inland beneath the onset of the Northeast Greenland Ice Stream Open
Rapidly-flowing ice streams drain the interior of the Greenland Ice Sheet, currently accounting for around half of its annual mass loss. The Northeast Greenland Ice Stream (NEGIS) is one of the largest, recognisable almost 600 km inland, a…
View article: Linking crystallographic orientation and ice stream dynamics: evidence from the EastGRIP ice core
Linking crystallographic orientation and ice stream dynamics: evidence from the EastGRIP ice core Open
A better understanding of glacial ice flow and how it is influenced by internal deformation is required to improve the projections of future sea level rise under a warming climate. Large ice streams, the main contributors to solid-ice disc…
View article: Topographic Effect Creates Non‐climatic Variations in Ice‐Core Based Temperature Records of the Last Millennium in Dronning Maud Land, Antarctica
Topographic Effect Creates Non‐climatic Variations in Ice‐Core Based Temperature Records of the Last Millennium in Dronning Maud Land, Antarctica Open
Past temperature reconstructions from polar ice sheets are commonly based on stable water isotope records in ice‐cores. However, despite major efforts in the understanding of the ice‐core signal formation, the temperature reconstructions o…
View article: Formation of mega-scale glacial lineations far inland beneath the onset of the Northeast Greenland Ice Stream
Formation of mega-scale glacial lineations far inland beneath the onset of the Northeast Greenland Ice Stream Open
Rapidly-flowing ice streams drain the interior of the Greenland Ice Sheet, currently accounting for around half of its annual mass loss. The Northeast Greenland Ice Stream (NEGIS) is one of the largest, recognisable almost 600 km inland, a…
View article:  Brittle creep deformation observed in an ice stream from borehole distributed acoustic sensing 
 Brittle creep deformation observed in an ice stream from borehole distributed acoustic sensing  Open
Ice streams are major contributors to ice sheet mass loss and critical regulators of sea level change. Despite their importance, standard viscous flow simulations of ice stream deformation and evolution have limited predictive power, mostl…
View article: Physical properties in the shear margin of the Northeast Greenland Ice Stream
Physical properties in the shear margin of the Northeast Greenland Ice Stream Open
The North-East Greenland Ice Stream (NEGIS) is a major contributor to ice loss experienced by the Greenland Ice Sheet. Our current understanding of the mechanics of this highly dynamic feature is limited compared to the surrounding slowly …
View article: Speed variability of Wordie Bay outlet glaciers driven by subglacial hydrology
Speed variability of Wordie Bay outlet glaciers driven by subglacial hydrology Open
The Antarctic Peninsula (AP) accelerating mass loss is dominated by ice dynamics [1]. The most up-to-date research reveals a widespread increase in discharge from glaciers on the west coast of the Antarctic Peninsula since 2018 [2]. The we…
View article: Airborne radar polarimetry over the Northeast Greenland Ice Stream
Airborne radar polarimetry over the Northeast Greenland Ice Stream Open
Ice streams are important export routes for ice from the interior of ice sheets to the ocean and a key component for projecting future sea level rise under continued climate heating. Over the last years, evidence emerged that the distribut…
View article: Diverse geomorphological regimes underlie the Northeast Greenland Ice Stream
Diverse geomorphological regimes underlie the Northeast Greenland Ice Stream Open
Approximately 17% of the modern Greenland Ice Sheet is drained via the Northeast Greenland Ice Stream (NEGIS), which extends ~600 km into the interior of the ice sheet. The NEGIS is generally thought to be topographically unconstrained, as…
View article: How to make an ice stream
How to make an ice stream Open
Fast-flowing ice streams drain most of the inland ice from the Antarctic and Greenland ice sheets. Despite their critical role, the formation mechanisms of ice streams and their shear margins remain controversial. We present a three-dimens…
View article: Reactivation of a Subglacial Channel Around the Grounding Zone of Roi Baudouin Ice Shelf, Antarctica
Reactivation of a Subglacial Channel Around the Grounding Zone of Roi Baudouin Ice Shelf, Antarctica Open
Subglacial water beneath the Antarctic Ice Sheet is often funneled via subglacial channels, which inject freshwater into ice‐shelf cavities where it interacts with ocean water. The temporal variability of this system has been poorly observ…
View article: Topographic and geologic controls on the Northeast Greenland Ice Stream
Topographic and geologic controls on the Northeast Greenland Ice Stream Open
The Northeast Greenland Ice Stream (NEGIS) is an elongated feature extending ∼600 km into the interior of the Greenland Ice Sheet. Here, we investigate detailed subglacial topography along the length of the NEGIS to ascertain the character…
View article: EastGRIP ice core reveals the exceptional evolution of crystallographic preferred orientation throughout the Northeast Greenland Ice Stream
EastGRIP ice core reveals the exceptional evolution of crystallographic preferred orientation throughout the Northeast Greenland Ice Stream Open
A better understanding of glacial ice flow and how it is influenced by internal deformation is required to improve the projections of future sea-level rise in a warming climate. Especially large ice streams, the main contributors to solid …
View article: Sediment Freeze‐On and Transport Near the Onset of a Fast‐Flowing Glacier in East Antarctica
Sediment Freeze‐On and Transport Near the Onset of a Fast‐Flowing Glacier in East Antarctica Open
Understanding the material properties and physical conditions of basal ice is crucial for a comprehensive understanding of Antarctic ice‐sheet dynamics. Yet, direct data are sparse and difficult to acquire. Here, we employ ultra‐wideband r…
View article: Folded ice in the upper North East Greenland Ice Stream reveal timing of the onset of streaming
Folded ice in the upper North East Greenland Ice Stream reveal timing of the onset of streaming Open
Only a few localised ice streams drain most ice from the Greenland Ice Sheet. Thus, understanding ice stream behaviour and their temporal variability is crucially important to predict future sea-level change. The interior trunk of the 700 …
View article: Spatial and temporal changes in surface mass balance derived from airborne radio sounding for the plateau area in Dronning Maud Land
Spatial and temporal changes in surface mass balance derived from airborne radio sounding for the plateau area in Dronning Maud Land Open
Contrary to the rest of the Antarctic ice sheet, East Antarctica currently gains mass due to an increase in snow accumulation over the last decades. How or if this increase is linked to anthropogenic warming is not yet clear and requires b…
View article: A structural geologist's view on the Northeast Greenland Ice Stream
A structural geologist's view on the Northeast Greenland Ice Stream Open
The Northeast Greenland Ice Stream (NEGIS) is a fascinating, over 500 km long structure in the Greenland Ice Sheet. The ice stream shows many features, such as folds and shear zones, that are also common in other ductile rocks. Geological …
View article: Deformation and recrystallization inside the Northeast Greenland Ice Stream – findings from microstructural analysis of the EastGRIP ice core
Deformation and recrystallization inside the Northeast Greenland Ice Stream – findings from microstructural analysis of the EastGRIP ice core Open
Solid ice discharge from land-based ice masses into the ocean raises the global sea level and accelerates due to anthropogenic climate change. Modelling ice flow dynamics aims to provide better projections of future sea level rise. The Ant…
View article: Sediment-laden basal ice units near the onset of a fast-flowing glacier in East Antarctica
Sediment-laden basal ice units near the onset of a fast-flowing glacier in East Antarctica Open
Understanding the material properties and physical conditions of basal ice is crucial for a comprehensive understanding of Antarctic ice-sheet dynamics. Yet, direct data are sparse and difficult to acquire, necessitating geophysical data f…
View article: High resolution subglacial topography from airborne swath radar beneath the Northeast Greenland Ice Stream (NEGIS)
High resolution subglacial topography from airborne swath radar beneath the Northeast Greenland Ice Stream (NEGIS) Open
Here we present an extensive swath radar dataset collected in the onset region of the Northeast Greenland Ice Stream, surrounding the East Greenland Ice Core Project site (EGRIP). We produce a new digital elevation model (DEM) of the subgl…
View article: Shear margins in upper half of Northeast Greenland Ice Stream were established two millennia ago
Shear margins in upper half of Northeast Greenland Ice Stream were established two millennia ago Open
Only a few localised ice streams drain most of the ice from the Greenland Ice Sheet. Thus, understanding ice stream behaviour and its temporal variability is crucially important to predict future sea-level change. The interior trunk of the…
View article: Potential to recover a record of Holocene climate and sea ice from Müller Ice Cap, Canada
Potential to recover a record of Holocene climate and sea ice from Müller Ice Cap, Canada Open
Müller Ice Cap sits on Umingmat Nunaat (Axel Heiberg Island), Nunavut, Canada, ~ 80°N. Its high latitude and elevation suggest it experiences relatively little melt and preserves an undisturbed paleoclimate record. Here, we present a suite…
View article: Radar internal reflection horizons from multisystem data reflect ice dynamic and surface accumulation history along the Princess Ragnhild Coast, Dronning Maud Land, East Antarctica
Radar internal reflection horizons from multisystem data reflect ice dynamic and surface accumulation history along the Princess Ragnhild Coast, Dronning Maud Land, East Antarctica Open
Ice shelves, which regulate ice flow from the Antarctic ice sheet towards the ocean, are shaped by spatiotemporal patterns of surface accumulation, surface/basal melt and ice dynamics. Therefore, an ice dynamic and accumulation history are…
View article: Antarctic Bedmap data: Findable, Accessible, Interoperable, and Reusable (FAIR) sharing of 60 years of ice bed, surface, and thickness data
Antarctic Bedmap data: Findable, Accessible, Interoperable, and Reusable (FAIR) sharing of 60 years of ice bed, surface, and thickness data Open
One of the key components of this research has been the mapping of Antarctic bed topography and ice thickness parameters that are crucial for modelling ice flow and hence for predicting future ice loss and the ensuing sea level rise. Suppo…
View article: Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream
Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream Open
The dynamic mass loss of ice sheets constitutes one of the biggest uncertainties in projections of ice-sheet evolution. One central, understudied aspect of ice flow is how the bulk orientation of the crystal orientation fabric translates t…
View article: Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream – CORRIGENDUM
Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream – CORRIGENDUM Open
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