A5055926599- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Geophysics and Gravity Measurements
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Soil Moisture and Remote Sensing
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Planetary Science and Exploration
- GNSS positioning and interference
- Polar Research and Ecology
- Geological and Geophysical Studies Worldwide
- Arctic and Russian Policy Studies
- Inertial Sensor and Navigation
- Organophosphorus compounds synthesis
- Synthesis and Reactivity of Sulfur-Containing Compounds
- Spacecraft and Cryogenic Technologies
- Meteorological Phenomena and Simulations
- High Altitude and Hypoxia
- Chemical Synthesis and Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Ocean Waves and Remote Sensing
Technische Universität Dresden
2014-2023
Planet
2016-2023
Federal Agency for Cartography and Geodesy
2021-2023
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2019-2020
Universität Greifswald
1979
University of Bonn
1963
Abstract. We developed a multi-mission satellite altimetry analysis over the Antarctic Ice Sheet which comprises Seasat, Geosat, ERS-1, ERS-2, Envisat, ICESat and CryoSat-2. After consistent reprocessing stepwise calibration of inter-mission offsets, we obtained monthly grids surface elevation change (SEC) with respect to reference epoch 09/2010 (in format month/year) from 1978 2017. A validation independent changes in situ airborne observations as well comparison firn model proves that...
Abstract. Ice losses from the Greenland and Antarctic ice sheets have accelerated since 1990s, accounting for a significant increase in global mean sea level. Here, we present new 29-year record of sheet mass balance 1992 to 2020 Sheet Mass Balance Inter-comparison Exercise (IMBIE). We compare combine 50 independent estimates derived satellite observations temporal changes flow, volume, Earth's gravity field. Between 2020, contributed 21.0±1.9 mm level, with rate loss rising 105 Gt yr−1...
Supraglacial liquid water at the margins of ice sheets has an important impact on surface energy balance and can also influence flow when supraglacial lakes drain to bed. Optical imagery is able monitor during summer season. Here we developed alternative method using polarimetric SAR from Sentinel-1 2017–2020 distinguish between other types margin Northeast Greenland Ice Stream. This allows hydrology be monitored winter months too. We found that majority persist over winter. When comparing...
Abstract. The role of polar regions is increasing in terms megatrends such as globalization, new transport routes, demography, and the use natural resources with consequent effects on regional transported pollutant concentrations. We set up ERA-PLANET Strand 4 project “iCUPE – integrative Comprehensive Understanding Polar Environments” to provide novel insights observational data global grand challenges an Arctic focus. utilize integrated approach combining situ observations, satellite...
Abstract. Ice-surface elevation profiles of more than 30 000 km in total length are derived from kinematic GNSS (GPS and the Russian GLONASS) observations on sledge convoy vehicles along traverses between Vostok Station East Antarctic coast. These have accuracies 4 9 cm. They used to validate data sets both radar laser satellite altimetry as well four digital models. A crossover analysis with three different processing versions Envisat yields a clear preference for relocation method over...
Thirty‒one GPS geodetic measurements of crustal uplift in southernmost South America determined extraordinarily high trend rates (> 35 mm/yr) the north‒central part Southern Patagonian Icefield. These trends have a coherent pattern, motivating refined viscoelastic glacial isostatic adjustment model to explain observations. Two end‒member models provide good fits: both require lithospheric thickness 36.5 ± 5.3 km. However, one has mantle viscosity near η =1.6 ×10 18 Pa s and an ice...
Abstract Height changes of the ice surface above subglacial Lake Vostok, East Antarctica, reflect integral effect different processes within environment and sheet. Repeated GNSS (Global Navigation Satellite Systems) observations on 56 markers in Vostok region spanning 11 years continuous at station over 5 are used to determine vertical firn particle movement. Vertical marker velocities derived with an accuracy 1 cm/yr or better. measurements height profiles around using kinematic a...
Abstract. Ice losses from the Greenland and Antarctic Sheets have accelerated since 1990s, accounting for a significant increase in global mean sea level. Here, we present new 29-year record of ice sheet mass balance 1992 to 2020 Sheet Mass Balance Inter-comparison Exercise (IMBIE). We compare combine 50 independent estimates derived satellite observations temporal changes flow, volume Earth’s gravity field. Between 2020, sheets contributed 21.0 ± 1.9 mm sea-level, with rate loss rising 105...
On interannual to decadal timescales, surface mass balance (SMB) exerts an important control over variations in the overall of Antarctic Ice Sheet (AIS). A proper characterization this variability is required determine statistically significant long-term trends SMB a robust manner. To do so, we quantify and firn thickness by combining results from multi-mission satellite altimetry SMB/firn modelling at grid scale. The objective study twofold: First, characterise errors both model spatially...
Abstract. Glacial isostatic adjustment (GIA) is a major source of uncertainty for ice and ocean mass balance estimates derived from satellite gravimetry. In Antarctica the gravimetric effect cryospheric change GIA are same order magnitude. Inverse geodetic observations hold some promise signal separation. Here, we investigate combination gravimetry altimetry demonstrate that choice input data sets processing methods will influence resultant inverse estimate. This includes spans full GRACE...
Abstract Satellite gravimetry and altimetry measurements record gravity elevation changes, respectively, which are useful for determining mass volume change of the Antarctic Ice Sheet. Common methods employ products from regional climate modeling firn to aid interpretation link changes changes. Estimating deterministic parameters over defined time periods is a conventional way evaluate those To overcome limitations analyses with respect time‐variable signals, we have developed state‐space...
Abstract. Elevation changes of the Antarctic Ice Sheet (AIS) related to surface mass balance and firn processes vary strongly in space time. Their subdecadal natural variability is large hampers detection long-term climate trends. Firn models or satellite altimetry observations are typically used investigate such thickness changes. However, there a spread among models. Further, they do not fully explain observed changes, especially on smaller spatial scales. Reconciled variations will...
Abstract. We present the results of glaciological investigations in megadune area located 30 km to east Vostok Station (central East Antarctica) implemented during 58th, 59th and 60th Russian Antarctic Expedition (January 2013–2015). Snow accumulation rate isotope content (δD, δ18O δ17O) were measured along 2 profile across ridge accompanied by precise GPS altitude measurements ground penetrating radar (GPR) survey. It is shown that spatial variability snow covaries with surface slope. The...
Abstract Satellite altimetry has been widely used to determine surface elevation changes in polar ice sheets. The original height measurements are irregularly distributed space and time. Gridded commonly derived by repeat analysis (RAA) subsequent spatial interpolation of change estimates. This article assesses how methodological choices related those two steps affect the accuracy changes, well this is represented formal uncertainties. In a simulation environment resembling CryoSat-2...
Abstract The question whether Antarctica's largest lake, subglacial Lake Vostok, exchanges water is of interdisciplinary relevance but has been undecided so far. We present the potential pathway, outlet location, and threshold height discharge from this lake based on a quantitative evaluation fluid potential. If left it would flow toward Ross Ice Shelf. Discharge occur first to east southern tip lake. At location bedrock 91 ± 23 m higher than hydrostatic equipotential level Vostok. It...
Abstract. We developed an approach for a multi-mission satellite altimetry analysis over the Antarctic Ice Sheet which comprises Seasat, Geosat, ERS-1, ERS-2, Envisat, ICESat and CryoSat-2. In first step we apply consistent reprocessing of radar alitmetry data improves measurement precision by up to 50 %. then perform joint repeat all missions. estimate inter-mission offsets approaches adapted temporal overlap or non-overlap similarity dissimilarity involved techniques. Hence, obtain monthly...
Abstract. Elevation changes of the Antarctic Ice Sheet (AIS) related to surface mass balance (SMB) and firn processes vary strongly in space time. Their short-term natural variability is large hampers detection long-term climate trends. Firn models or satellite altimetry observations are typically used investigate such thickness changes. However, there a spread among models. Further, they do not fully explain observed changes, especially on smaller temporal spatial scales. Reconciled...
Abstract Es wird die Synthese weiterer Alkanphosphonsäure‐diamide (I–XIII) und einiger ‐monoamide (XIV, XV) beschrieben. Aus Alkanphosphonsäure‐dichloriden werden dimere Imide (XVI–XX) gewonnen, wahrscheinlich einen Ring aus zwei Phosphor‐ Stickstoff‐Atomen enthalten. Ferner neue Butanphostam‐(1.4)‐säureamide (XXI–XXIV) hergestellt.
Abstract Increasing ice loss of the Antarctic Ice Sheet (AIS) due to global climate change affects orientation Earth’s spin axis with respect an Earth-fixed reference system (polar motion). Here contribution decreasing AIS excitation polar motion is quantified from precise time variable gravity field observations Gravity Recovery and Climate Experiment (GRACE) measurements changing sheet elevation altimeter satellites. While GRACE models need be reduced by noise leakage effects neighboring...
Surface melt, driven by atmospheric temperatures and albedo, is a strong contribution of mass loss the Greenland Ice Sheet. In past, black carbon, algae other light-absorbing impurities were suggested to govern albedo in Greenland’s ablation zone. Here we combine optical (MODIS/Sentinel-2) radar (Sentinel-1) remote sensing data with airborne laser scanner data, engage firn modelling identify governing factors leading dark glacier surfaces Northeast Greenland. After drainage supraglacial...
Abstract. Ice-surface elevation profiles of more than 30.000 km in total length are derived from kinematic GNSS observations on sledge convoy vehicles along traverses between Vostok station and the East Antarctic coast. The have accuracies 4 9 cm. They used to validate datasets both radar laser satellite altimetry as well four digital models. A crossover analysis with three different Envisat yields a clear preference for relocation method over direct slope correction threshold retrackers...
Abstract. The role of polar regions increases in terms megatrends such as globalization, new transport routes, demography and use natural resources consequent effects regional transported pollutant concentrations. We set up the ERA-PLANET Strand 4 project iCUPE – integrative Comprehensive Understanding on Polar Environments to provide novel insights observational data global grand challenges with an Arctic focus. utilize integrated approach combining situ observations, satellite remote...