A5025832945- Cryospheric studies and observations
- Geophysics and Gravity Measurements
- Winter Sports Injuries and Performance
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Inertial Sensor and Navigation
- Polar Research and Ecology
- Astronomical Observations and Instrumentation
- Meteorological Phenomena and Simulations
- Methane Hydrates and Related Phenomena
- Target Tracking and Data Fusion in Sensor Networks
- Marine animal studies overview
- Atmospheric and Environmental Gas Dynamics
- Geophysical Methods and Applications
- Icing and De-icing Technologies
- Computational Physics and Python Applications
- Aerospace Engineering and Energy Systems
- Gamma-ray bursts and supernovae
- Infrared Target Detection Methodologies
- Spacecraft and Cryogenic Technologies
- Scientific Research and Discoveries
- Satellite Image Processing and Photogrammetry
- Soil Moisture and Remote Sensing
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2016-2025
University of Alabama
2020
École Polytechnique Fédérale de Lausanne
2013
University of Münster
1997
British Antarctic Survey
1997
Abstract. We present Bedmap2, a new suite of gridded products describing surface elevation, ice-thickness and the seafloor subglacial bed elevation Antarctic south 60° S. derived these using data from variety sources, including many substantial surveys completed since original Bedmap compilation (Bedmap1) in 2001. In particular, Bedmap2 ice thickness grid is made 25 million measurements, over two orders magnitude more than were used Bedmap1. most parts Antarctica landscape visible much...
Abstract. We present a new bed elevation dataset for Greenland derived from combination of multiple airborne ice thickness surveys undertaken between the 1970s and 2012. Around 420 000 line kilometres data were used, with roughly 70% this having been collected since year 2000, when last comprehensive compilation was undertaken. The combined satellite-derived elevations non-glaciated terrain to produce consistent digital model (DEM) over entire island including across glaciated–ice free...
Abstract. The ocean plays an important role in modulating the mass balance of polar ice sheets by interacting with shelves Antarctica and marine-terminating outlet glaciers Greenland. Given that flux warm water onto continental shelf into sub-ice cavities is steered complex bathymetry, a detailed topography data set essential ingredient for models address ice–ocean interaction. We followed spirit global RTopo-1 compiled consistent maps upper lower surface topographies, height on spherical...
Abstract We present Bedmap3, the latest suite of gridded products describing surface elevation, ice-thickness and seafloor subglacial bed elevation Antarctic south 60 °S. Bedmap3 incorporates adds to all post-1950s datasets previously used for Bedmap2, including 84 new aero-geophysical surveys by 15 data providers, an additional 52 million points 1.9 line-kilometres measurement. These efforts have filled notable gaps in major mountain ranges deep interior East Antarctica, along West...
Abstract. We present Bedmap2, a new suite of gridded products describing surface elevation, ice-thickness and the seafloor subglacial bed elevation Antarctic south 60° S. derived these using data from variety sources, including many substantial surveys completed since original Bedmap compilation (Bedmap1) in 2001. In particular, Bedmap2 ice thickness grid is made 25 million measurements, over two orders magnitude more than were used Bedmap1. most parts Antarctica landscape visible much...
Abstract. The recovery of a 1.5 million yr long ice core from Antarctica represents keystone our understanding Quaternary climate, the progression glaciation over this time period and role greenhouse gas cycles in progression. Here we tackle question where such may still be found Antarctic sheet. We can show that old is most likely to exist plateau area East sheet (EAIS) without stratigraphic disturbance should able recovered after careful pre-site selection studies. Based on simple heat...
The increasing catalogue of high-quality ice-penetrating radar data provides a unique insight in the internal layering architecture Greenland ice sheet. stratigraphy, an indicator past deformation, highlights irregularities flow and reveals large perturbations without obvious links to bedrock shape. In this work, establish new conceptual model for formation process, we analysed at onset Petermann Glacier, North Greenland, created three-dimensional several distinct stratigraphic layers. We...
Abstract. 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 million years. European Beyond EPICA consortium has selected Little C (LDC), an ∼ 35 km southeast Concordia Station, attempt recover such record. Here, we present results final ice-penetrating radar survey used refine exact drill site. These data were acquired during 2019–2020 austral summer using new, multi-channel high-resolution...
The dynamic mass loss of ice sheets constitutes one the biggest uncertainties in projections ice-sheet evolution. One central, understudied aspect flow is how bulk orientation crystal fabric translates to mechanical anisotropy ice. Here we show spatial distribution depth-averaged horizontal and corresponding directional flow-enhancement factors covering a large area Northeast Greenland Ice Stream onset. Our results are based on airborne ground-based radar surveys, ice-core observations,...
Abstract. One of the key components this research has been mapping Antarctic bed topography and ice thickness parameters that are crucial for modelling flow hence predicting future loss ensuing sea level rise. Supported by Scientific Committee on Research (SCAR), Bedmap3 Action Group aims not only to produce new gridded maps international scientific community, but also standardize make available all geophysical survey data points used in producing Bedmap products. Here, we document latest...
Due to the remoteness and difficulty access snow covered polar regions, ski-equipped aircraft are an indispensable tool for research. The Alfred Wegener Institute has a long tradition in airborne science – starting with Polar1 Polar2 1983. In 2007 first Basler BT-67 (Polar5) 2011 second (Polar6) were brought into service replaced Polar4. They carry variety of scientific equipment investigation lithosphere, atmosphere cryosphere all their interactions. Beside being deployed missions, also...
Abstract. We present a high-resolution airborne radar data set (EGRIP-NOR-2018) for the onset region of Northeast Greenland Ice Stream (NEGIS). The were acquired in May 2018 with Alfred Wegener Institute's multichannel ultra-wideband (UWB) mounted on Polar 6 aircraft. Radar profiles cover an area ∼24 000 km2 and extend over well-defined shear margins NEGIS. survey is centered at location drill site East Ice-Core Project (EastGRIP), several lines intersect this location. layout was designed...
Abstract During the past 20 years, multi-channel radar emerged as a key tool for deciphering an ice sheet's internal architecture. To assign ages to reflections and connect them over large areas in sheet, layer genesis has be understood on microphysical scale. Synthetic trace modelling based dielectric profile of cores allows assignation observed physical properties’ variations decimetre scale reflectors extending from coring site regional or even whole-ice-sheet In this paper we rely...
Abstract This paper presents a new compilation of gridded datasets for three-dimensional modelling the Antarctic ice sheet. These are surface elevation, thickness, bedrock elevation and accumulation rate as interpolated on 281 × mesh with 20 km spacing, encompass all sheet surrounding continental shelf. Data sources include Bamber digital-elevation model from ERS-1 radar-altimeter data, redigitization available ice-thickness Giovinetto recent data British German expeditions well Norwegian...
Abstract. The origin of a strong continuous radar reflector observed with airborne radio-echo sounding (RES) at the EPICA deep-drilling site in Dronning Maud Land, Antarctica, is identified as transition crystal fabric orientation from vertical girdle to an increased single-pole seen along ice core. 60 ns and 600 long pulse frequency 150 MHz, spans one length, over 5 km, occurs depth about 2025–2045 m drill site. Changes conductivity are excluded by investigating ice-core profile, synthetic...
Abstract. Radio-echo sounding of the Antarctic and Greenlandic ice sheets often reveals a layer in lowest hundreds meters above bedrock more or less free radio echoes, known as echo-free zone (EFZ). The cause this feature is unclear, so far lacking direct evidence for its origin. We compare echoes around EPICA drill site Dronning Maud Land, Antarctica, with dielectric properties, crystal orientation fabrics optical stratigraphy EPICA-DML core. find that disappear depth range where contrast...
We investigate the propagation of seismic waves in anisotropic ice. Two effects are important: (i) sudden changes crystal orientation fabric (COF) lead to englacial reflections; (ii) induces an angle dependency on velocities and, thus, recorded travel times. Velocities calculated from polycrystal elasticity tensor derived for measured COF eigenvalues EDML ice core, Antarctica, show good agreement with velocity trend determined vertical profiling. The absolute values, however, depends choice...
Abstract The Northeast Greenland Ice Stream (NEGIS) is an important dynamic component for the total mass balance of ice sheet, as it reaches up to central divide and drains 12% sheet. geometric boundary conditions in particular nature subglacial bed NEGIS are essential understand its flow dynamics. We present a record more than 8000 km radar survey lines multi-channel, ultra-wideband radio echo sounding data covering area 24 000 2 , centered on drill site East Ice-core Project (EGRIP), upper...
Abstract The East Antarctic Ice Sheet (EAIS) is underlain by a series of low‐lying subglacial sedimentary basins. extent, geology, and basal topography these basins are important boundary conditions governing the dynamics overlying ice sheet. This particularly pertinent for close to grounding line wherein EAIS grounded below sea level therefore potentially vulnerable rapid retreat. Here we analyze newly acquired airborne geophysical data over Pensacola‐Pole Basin (PPB), previously unexplored...
Abstract The internal stratigraphy of snow and ice as imaged by ground-penetrating radar may serve a source information on past accumulation. This study presents results from two ground-based surveys conducted in Greenland 2007 2015, respectively. first survey was during the traverse ice-core station NGRIP (North Ice Core Project) to NEEM Eemian Drilling). second carried out EGRIP (East then onwards Summit Station. total length profiles is 1427 km. From data, we retrieve large-scale spatial...
Abstract Reliable knowledge of ice discharge dynamics for the Greenland sheet via its streams is essential if we are to understand stability under future climate scenarios. Currently active in have been well mapped using remote-sensing data while past ice-stream paths what now deglaciated regions can be reconstructed from landforms they left behind. However, little known about possible former and defunct areas still covered by ice. Here use radio-echo sounding decipher regional ice-flow...
Abstract. A nested ice flow model was developed for eastern Dronning Maud Land to assist with the dating and interpretation of EDML deep core. The consists a high-resolution higher-order dynamic that into comprehensive 3-D thermomechanical whole Antarctic sheet. As drill site is on flank position calculations specifically take account effects horizontal advection as deeper in core originated from higher inland. First regional velocity field sheet geometry obtained forward experiment over...
Abstract Radar data (center frequency 150 MHz) collected on the Antarctic plateau near EPICA deep-drilling site in Dronning Maud Land vary systematically backscattered power, depending azimuth antenna orientation. Backscatter extrema are aligned with principal directions of surface strain rates and change depth. In upper 900m, backscatter is strongest when polarization direction maximal compression, while below 900 m maxima shift by 90° pointing towards lateral flow dilatation. We...
In this paper, we present the development of a multi-channel VHF/UHF ultra-wideband airborne radar sounder and imager for measurements polar ice sheets. The was developed at Center Remote Sensing Ice Sheets (CReSIS) operation onboard German Alfred Wegener Institute (AWI) Basler BT-67 aircraft. system operates from 150 to 600 MHz corresponding vertical resolution 33 cm in free space. is equipped with three 4-m long 8-element antenna subarrays installed under fuselage both wings support 8...