A5091381085- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- earthquake and tectonic studies
- Geophysical and Geoelectrical Methods
- Geochemistry and Geologic Mapping
- Earthquake Detection and Analysis
- Solar and Space Plasma Dynamics
- Advanced Measurement and Metrology Techniques
- Optical measurement and interference techniques
- Insurance, Mortality, Demography, Risk Management
- Ionosphere and magnetosphere dynamics
- Climate Change and Health Impacts
- Seismic Imaging and Inversion Techniques
- Scientific Computing and Data Management
- Geological Formations and Processes Exploration
- Neural Networks and Reservoir Computing
- Landslides and related hazards
- Distributed and Parallel Computing Systems
- Data Visualization and Analytics
- Geological Modeling and Analysis
- Image Processing Techniques and Applications
- Magnetic Field Sensors Techniques
- Advanced Surface Polishing Techniques
- Geological and Geochemical Analysis
- Surface Roughness and Optical Measurements
GFZ Helmholtz Centre for Geosciences
2013-2024
Centre de Géosciences
2024
Physikalisch-Technische Bundesanstalt
2018-2020
University of Potsdam
2010-2012
The 12th generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2014 by Working Group V-MOD appointed Association Geomagnetism and Aeronomy (IAGA). It updates previous IGRF with a definitive main field model for epoch 2010.0, 2015.0, linear annual predictive secular variation 2015.0-2020.0. Here, we present equations defining model, provide spherical harmonic coefficients, maps magnetic declination, inclination, total intensity 2015.0 their predicted rates...
Swarm, a three-satellite constellation to study the dynamics of Earth’s magnetic field and its interactions with Earth system, is expected be launched in late 2013. The objective Swarm mission provide best ever survey geomagnetic temporal evolution, order gain new insights into system by improving our understanding interior environment. In derive advanced models (and other higher-level data products) it necessary take explicit advantage aspect Swarm. SCARF (SatelliteConstellationApplication...
The 12th revision of the International Geomagnetic Reference Field (IGRF) was issued in December 2014 by Association Geomagnetism and Aeronomy (IAGA) Division V Working Group V-MOD ( http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html ). This comprises new spherical harmonic main field models for epochs 2010.0 (DGRF-2010) 2015.0 (IGRF-2015) predictive linear secular variation interval 2015.0-2020.0 (SV-2010-2015). were derived from weighted averages candidate submitted ten international teams....
We propose candidate models for IGRF-12. These were derived from parent built 10 months of Swarm satellite data and 1.5 years magnetic observatory data. Using the same parameterisation, a field model was slightly extended set. As result discrepancies between intensity measured by absolute scalar instrument that calculated vector instrument, we re-calibrated For calibration, assumed resulted small perturbing carried satellite, with strength orientation dependent on Sun's position relative to...
The need for high-quality aspheres is rapidly growing, necessitating increased accuracy in their measurement. A reliable uncertainty assessment of asphere form measurement techniques difficult due to complexity. In order explore the current techniques, an interlaboratory comparison was carried out which four were measured by eight laboratories using tactile measurements, optical point and areal measurements. Altogether, 12 different devices employed. results analysed after subtracting design...
In view of an optimal exploitation the Swarm data set, we have prepared and tested software dedicated to determination accurate core magnetic field models Euler angles between sensors satellite reference frame. The model estimation is derived directly from GFZ Reference Internal Magnetic Model (GRIMM) inversion modeling family. selection techniques parameterizations are similar what were used for derivation second (Lesur et al., 2010) third versions GRIMM, although usage observatory not...
Abstract A round robin comparison of freeform form measurements was carried out by the project partners and stakeholders a European metrology research project. Altogether six measuring instruments were considered: five different (pointwise areal) optical devices one tactile device. Three surfaces used for measurements, where two specimens measured specimen four instruments. In this paper, evaluation methods results are presented three made from temperature-stable material, Super Invar ® ....
Abstract. Virtual experiments have become an indispensable tool for the design and accuracy assessment of novel measurement procedures instruments. are particularly relevant in modern optics due to its challenging demands highly accurate measurements. This paper introduces SimOptDevice, a flexible library opto-mechanical virtual experiments. After describing scope general structure library, underlying mathematical tools used solving related numerical tasks described. Finally, application...
Abstract. Glacial isostatic adjustment is largely governed by the rheological properties of Earth's mantle. Large mass redistributions in ocean–cryosphere system and subsequent response viscoelastic Earth have led to dramatic sea level changes past. This process ongoing, order understand predict current future changes, knowledge mantle such as viscosity essential. In this study, we present a method obtain estimates viscosities assimilation relative rates change into model lithosphere We set...
An increasing number of regional inversions gravity and magnetic field data have recently been computed, some based on satellite ground data, only. In each case it is important to quantify the errors resulting from confined region or parameters. this study we investigate error distribution for scalar vector geomagnetic We include effects altitude, size region, signal-to-noise ratio spherical harmonic degree an a priori global model. evaluate our results basis inversion Earth's field.
In this study we analyse the error distribution in regional models of geomagnetic field. Our main focus is to investigate errors when combining two patches obtain a global field from ones. To simulate overlapping choose different data region shapes that resemble scenario. First, elliptical regions and secondly obtained circular spherical caps. We conduct Monte-Carlo simulation using synthetic expected mean errors. For results are similar ones for caps: maximum at boundary decreases towards...
<title>Abstract</title> The aim of this work is the prediction heat-related mortality for Germany under future, i.e. hotter, climate conditions. made based on 2m temperature data from storyline simulations using machine learning techniques. We use an echo state network linking outputs to target data. are all-cause rates all ages. trained with present day model outputs. Model 2K and 4K warmer, storylines used predict such climatic find that we can train recent make plausible predictions about...
In geosciences, machine learning (ML) has become essential for solving complex problems, such as predicting natural disasters or analysing the impact of extreme temperatures on mortality rates. However, integration ML into geoscience scenarios faces significant challenges, especially in explaining influence hyperparameters (HP) model performance and behaviour specific scenarios. The Explainable Artificial Intelligence (XAI) system ClarifAI developed at GFZ addresses these challenges by...
Climate change has drastic impact on our lives and many socio-economic parameters. The exact consequences are hard to quantify in general not obvious clear the public. In this work we use storyline scenarios from within SCENIC project for prediction of various parameters warmer climates. We machine learning algorithms investigate how that have direct impacts society population develop different world scenarios. For purpose train echo state networks. Input data temperature humidity fields...
Background: Heat waves are a great risk for human health and major cause of fatalities during the summer months. Changing climate leads to higher probability heat likely will result in increased numbers deaths summer. In this study, we quantify expected increase mortality due warmer conditions two storylines from global Earth system modelling. Methods: We apply an echo state network outputs storyline simulations. As target data, rates Germany used. The is trained with present day model...