Heinrich Miller
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View article: Heliomagnetic and geomagnetic activity cycles on millennial timescales
Heliomagnetic and geomagnetic activity cycles on millennial timescales Open
We report 17 new solar activity cycles with periodicities ranging from 1,700 to 18,000 years. Using Bayesian spectral analysis we determined for each cycle period, amplitude and phase for the past 145,000 years. These results were obtained…
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: Stagnant ice and age modelling in the Dome C region, Antarctica
Stagnant ice and age modelling in the Dome C region, Antarctica Open
The European Beyond EPICA project aims to extract a continuous ice core of up to 1.5 Ma, with a maximum age density of 20 kyr m−1 at Little Dome C (LDC). We present a 1D numerical model which calculates the age of the ice around Dome C. Th…
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: Comment on egusphere-2023-157
Comment on egusphere-2023-157 Open
Abstract. We present a 1D numerical model which calculates the age of ice around Dome C. It accounts either for melting or for a layer of stagnant ice above the bedrock, depending on the value of an inverted mechanical ice thickness. It is…
View article: Stagnant ice and age modelling in the Dome C region, Antarctica
Stagnant ice and age modelling in the Dome C region, Antarctica Open
We present a 1D numerical model which calculates the age of ice around Dome C. It accounts either for melting or for a layer of stagnant ice above the bedrock, depending on the value of an inverted mechanical ice thickness. It is constrain…
View article: Crystal fabric anisotropy causes directional hardening of theNortheast Greenland Ice Stream
Crystal fabric anisotropy causes directional hardening of theNortheast Greenland Ice Stream Open
The dynamic mass loss of ice sheets due to ice flow constitutes one of the biggest uncertainties in projections of ice-sheet evolution and sea-level rise. One central, understudied aspect of ice flow is how the bulk orientation of the ice-…
View article: Ice-flow history and observations from the ice base of Jutulstraumen drainage basin (Antarctica)
Ice-flow history and observations from the ice base of Jutulstraumen drainage basin (Antarctica) Open
<p>Future sea-level predictions require that the history of the Antarctic Ice Sheet is well understood and constrained by observations. Much of the ice sheets&#8217;&#160; ice-dynamic properties are governed by processes at t…
View article: Airborne ultra-wideband radar sounding over the shear margins and along flow lines at the onset region of the Northeast Greenland Ice Stream
Airborne ultra-wideband radar sounding over the shear margins and along flow lines at the onset region of the Northeast Greenland Ice Stream Open
We present a high-resolution airborne radar data set (EGRIP-NOR-2018) for the onset region of the Northeast Greenland Ice Stream (NEGIS). The radar data were acquired in May 2018 with the Alfred Wegener Institute's multichannel ultra-wideb…
View article: Preserved landscapes underneath the Antarctic Ice Sheet reveal the geomorphological history of Jutulstraumen Basin
Preserved landscapes underneath the Antarctic Ice Sheet reveal the geomorphological history of Jutulstraumen Basin Open
The landscape of Antarctica, hidden beneath kilometre‐thick ice in most places, has been shaped by the interactions between tectonic and erosional processes. The flow dynamics of the thick ice cover deepened pre‐formed topographic depressi…
View article: Comment on essd-2021-91
Comment on essd-2021-91 Open
Abstract. We present a high-resolution airborne radar data set (EGRIP-NOR-2018) for the onset region of the Northeast Greenland Ice Stream (NEGIS). The radar data were acquired in May 2018 with the Alfred Wegener Institute's multichannel …
View article: Comment on essd-2021-91
Comment on essd-2021-91 Open
Abstract. We present a high-resolution airborne radar data set (EGRIP-NOR-2018) for the onset region of the Northeast Greenland Ice Stream (NEGIS). The radar data were acquired in May 2018 with the Alfred Wegener Institute's multichannel …
View article: VHF Radio Echo Sounding from Dome C to Little Dome C
VHF Radio Echo Sounding from Dome C to Little Dome C Open
These are ice-penetrating radar data connecting the newly chosen Beyond EPICA Little Dome C core site to the EPICA Dome C core site, collected in late 2019. These data are presented in a paper in The Cryosphere (https://doi.org/10.5194/tc-…
View article: VHF Radio Echo Sounding from Dome C to Little Dome C
VHF Radio Echo Sounding from Dome C to Little Dome C Open
These are ice-penetrating radar data connecting the newly chosen Beyond EPICA Little Dome C core site to the EPICA Dome C core site, collected in late 2019. These data are presented in a paper in The Cryosphere (https://doi.org/10.5194/tc-…
View article: Brief communication: New radar constraints support presence of ice older than 1.5 Myr at Little Dome C
Brief communication: New radar constraints support presence of ice older than 1.5 Myr at Little Dome C Open
The area near Dome C, East Antarctica, is thought to be one of the most promising targets for recovering a continuous ice-core record spanning more than a million years. The European Beyond EPICA consortium has selected Little Dome C (LDC)…
View article: Airborne ultra-wideband radar sounding over the shear margins and along flow lines at the onset region of the Northeast Greenland Ice Stream
Airborne ultra-wideband radar sounding over the shear margins and along flow lines at the onset region of the Northeast Greenland Ice Stream Open
We present a high-resolution airborne radar data set (EGRIP-NOR-2018) for the onset region of the Northeast Greenland Ice Stream (NEGIS). The radar data were acquired in May 2018 with Alfred Wegener Institute’s multichannel ultra-wideband …
View article: Interior of an ice stream: 3-D geometry of distorted radar stratigraphy of upstream NEGIS and vicinity.
Interior of an ice stream: 3-D geometry of distorted radar stratigraphy of upstream NEGIS and vicinity. Open
<p>The North East Greenland Ice Stream clearly stands out in the surface velocity field of the ice flow of Greenland, with its sharp and narrow shear margins visible in the flow field almost up to the central divide. While the curren…
View article: Fabric beats in radar data across the NEGIS ice stream
Fabric beats in radar data across the NEGIS ice stream Open
<p>Crystal anisotropy of ice causes slight birefringence for electromagnetic waves. At the same time, the mechanical anisotropy amounts to several orders of magnitude, thus making fabric properties highly-relevant for internal deform…
View article: Three component shallow seismic mini-vibrator data of polar firn of Kohnen Station, East Antarctica
Three component shallow seismic mini-vibrator data of polar firn of Kohnen Station, East Antarctica Open
In 2012 we performed an active seismic experiment at Kohnen Station, (S 75.0041, E 0.0637), Antarctica. We recorded two perpendicular seismic profiles. The source was a minivibrator (ELVIS, wheelbarrow sized) producing a 30-240 Hz, 10 s li…
View article: Brief Communication: New radar constraints support presence ofice older than 1.5 Ma at Little Dome C
Brief Communication: New radar constraints support presence ofice older than 1.5 Ma at Little Dome C Open
The area near Dome C, East Antarctica, is thought to be one of the most promising targets for recovering a continuous ice-core record spanning more than a million years. The European Beyond EPICA consortium has selected Little Dome C, an a…
View article: 3D Structure of NEGIS shear margins from radar stratigraphy
3D Structure of NEGIS shear margins from radar stratigraphy Open
<p>The North East Greenland Ice Stream (NEGIS) is delineated by well-defined shear margins, which are evident in the gradient of surface velocity field as well as in the surface topography, where they form troughs up to ten meters de…
View article: Plio‐Pleistocene Hemispheric (A)Symmetries in the Northern and Southern Hemisphere Midlatitudes
Plio‐Pleistocene Hemispheric (A)Symmetries in the Northern and Southern Hemisphere Midlatitudes Open
The transition from the warm, stable climate of the Pliocene to the progressively colder glaciations of the Pleistocene, as well as the climate system's evolving response to stationary orbital forcing over the Pleistocene, beg important qu…
View article: Multiangle, Frequency, and Polarization Radar Measurement of Ice Sheets
Multiangle, Frequency, and Polarization Radar Measurement of Ice Sheets Open
Radio echo sounding of polar ice sheets provides important information on the ice bed topography and internal layers. These data have been used by scientists to create 3D maps of polar ice sheets for climate modeling as well as to reconstr…
View article: Comparison of elastic moduli from seismic diving-wave and ice-core microstructure analysis in Antarctic polar firn
Comparison of elastic moduli from seismic diving-wave and ice-core microstructure analysis in Antarctic polar firn Open
We compared elastic moduli in polar firn derived from diving wave refraction seismic velocity analysis, firn-core density measurements and microstructure modelling based on firn-core data. The seismic data were obtained with a small electr…
View article: In situ-measurement of ice deformation from repeated borehole logging of the EPICA Dronning Maud Land (EDML) ice core, East Antarctica.
In situ-measurement of ice deformation from repeated borehole logging of the EPICA Dronning Maud Land (EDML) ice core, East Antarctica. Open
The European Project for Ice Coring in Antarctica (EPICA) ice core was drilled between 2001 and 2006 at the
\nKohnen Station, Antarctica. During the drilling process the borehole was logged repeatedly. Repeated logging of the borehole shap…
View article: Physical analysis of an Antarctic ice core—towards an integration of micro- and macrodynamics of polar ice
Physical analysis of an Antarctic ice core—towards an integration of micro- and macrodynamics of polar ice Open
Microstructures from deep ice cores reflect the dynamic conditions of the drill location as well as the thermodynamic history of the drill site and catchment area in great detail. Ice core parameters (crystal lattice-preferred orientation …