A5018565264- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Cryospheric studies and observations
- Advanced Frequency and Time Standards
- Geophysical and Geoelectrical Methods
- Atomic and Subatomic Physics Research
- Cardiovascular Syncope and Autonomic Disorders
- Methane Hydrates and Related Phenomena
- Hydrology and Watershed Management Studies
- Advanced Aircraft Design and Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Landslides and related hazards
- Vehicle emissions and performance
- Atmospheric Ozone and Climate
- Water resources management and optimization
- Laser-induced spectroscopy and plasma
- Pulsars and Gravitational Waves Research
- Cardiovascular and Diving-Related Complications
- Climate change and permafrost
- Air Quality and Health Impacts
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Statistical and numerical algorithms
- Cyclone Separators and Fluid Dynamics
GFZ Helmholtz Centre for Geosciences
2016-2024
Leibniz University Hannover
2010-2020
Leibniz University of Applied Sciences
2011
TUBITAK BILGEM
2007
Institut für Urheber- und Medienrecht
2007
Estimating the amount of snow, its evolution and spatiotemporal distribution in complex high-alpine terrain is currently considered as one most important challenges alpine hydrology water resources management. This predominantly caused by lack accurate information on variations snow equivalent (SWE) vast regions with no sensor to measure SWE beyond local scale. At Mt. Zugspitze, Germany, a superconducting gravimeter senses gravity effect seasonal reflecting temporal few kilometers scale...
Ocean tide variability can be decomposed into a vast spectrum of individual partial tides with distinct tidal periodicities. Besides the ~10 dominant frequencies well constrained by satellite altimetry, there is wide range smaller oscillations that are much less determined observations. other subgroups (e.g., radiational and degree-3 ocean tides) these comprise hydrodynamically nonlinear tides, which generated due to interactions major tides. The sums differences generating do not...
Monitoring snow water resources is crucial to understand the dynamics of snow-fed mountain rivers. Still, in harsh and remote environments like regions using conventional measurement techniques remains particularly challenging. Cosmic-Ray Neutron Sensing (CRNS) constitutes an emerging method for autonomous non-invasive monitoring soil moisture at intermediate spatial scales several hectares. The therefore promising equivalent (SWE) high alpine locations.The analysis includes two sites...
The latest generation of optical atomic clocks is approaching the level one part in 1018 terms frequency stability and uncertainty. For clock comparisons definition international time scales, a relativistic redshift effect frequencies has to be taken into account at corresponding uncertainty about 0.1 m2 s−2 0.01 m gravity potential height, respectively. Besides predominant static potential, temporal variations must considered order avoid systematic shifts. Time-variable components induced...
SUMMARY High spatial and temporal resolution of gravity observations allows quantifying understanding mass changes in volcanoes, geothermal or other complex geosystems. For this purpose, accurate meters are required. However, transport the to remote study areas may affect instrument's performance. In work, we analyse continuous measurements three iGrav superconducting (iGrav006, iGrav015 iGrav032), before after between different monitoring sites. 4 months, performed comparison a gravimetric...
Abstract. GFZ (German Research Centre for Geosciences) set up the Zugspitze Geodynamic Observatory Germany with a worldwide unique installation of superconducting gravimeter at summit Mount on top Partnach spring catchment. This high alpine catchment is well instrumented, acts as natural lysimeter and has significant importance water supply to its forelands, large mean annual precipitation 2080 mm long seasonal snow cover period 9 months, while showing sensitivity climate change. However,...
Abstract We employ the barotropic, data-unconstrained ocean tide model TiME to derive an atlas for degree-3 tidal constituents including monthly terdiurnal species. The is optimized with respect gauge data set TICON-td that extended include respective of diurnal and higher frequencies. validation shows a root-mean-square (RMS) deviation 0.9–1.3 mm individual further load tide-induced gravimetric signals by two means (1) global Love number approach (2) evaluating Greens-integrals at 16...
In 2004, first absolute gravity (AG) measurements were performed on the top of Mt. Zugspitze (2 sites) and at foot (1 site) Wank. Wank (summit height 1780 m) (2960 are about 15 km apart from each other belong geologically to different parts Northern Limestone Alps. Bridging a time span years, deduced variations for in order −0.30 μm/s2 with standard uncertainty 0.04 μm/s2. The stations (foot top) show no significant variation. vertical stability summit is also confirmed by results continuous...
A new collaborative European project "International timescales with optical clocks" (ITOC) aims to tackle the key challenges that must be addressed prior a redefinition of SI second. coordinated programme comparisons will carried out between clocks developed in five different laboratories, enabling their performance levels validated at an unprecedented level accuracy. Supporting work evaluate relativistic effects influence comparisons, including gravitational redshift clock transition...
Hidden matter that interacts only gravitationally would oscillate at characteristic frequencies when trapped inside of Earth. For small oscillations near the center Earth, these are around 300 $\mu$Hz. Additionally, signatures higher harmonics appear because non-uniformity Earth's density. In this work, we use data from a global network gravimeters International Geodynamics and Earth Tide Service (IGETS) to look for hypothetical objects. We find no evidence such objects with masses on order...
We carried out a 26-day comparison of five simultaneously operated optical clocks and six atomic fountain located at INRIM, LNE-SYRTE, NPL PTB by using two satellite-based frequency techniques: broadband Two-Way Satellite Time Frequency Transfer (TWSTFT) Global Positioning System Precise Point (GPS PPP). With an enhanced statistical analysis procedure taking into account correlations gaps in the measurement data, combined overall uncertainties range $1.8 \times 10^{-16}$ to $3.5 for clock...
SUMMARY The superconducting gravimeter GWR iGrav 047 has been installed on the small offshore island of Heligoland in North Sea approximately at sea level with overall aim high-accuracy determination regional tidal and non-tidal ocean loading signals. For validation, a second (gPhoneX 152) setup within gravity gradiometer approach to observe temporal variations parallel upper land Heligoland. This study covers tide (OTL) parameters based two continuous gravimetric time-series after...
Monitoring the amount of snow, its spatiotemporal distribution as well onset and snow-melt induced runoff generation are key challenges in alpine hydrology. Cryo-hydro-gravimetry is a non-invasive method observing temporal gravity variations after reduction all other geophysical signals integral cryospheric hydrological mass including snow accumulation ablation. It has an accuracy up to 9 decimals on wide spectrum from high resolution 1 min several years within footprints approx. 50...