A5001598072- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Oceanographic and Atmospheric Processes
- Inertial Sensor and Navigation
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Ionosphere and magnetosphere dynamics
- Reservoir Engineering and Simulation Methods
- Planetary Science and Exploration
- Computational Physics and Python Applications
- Geological and Geophysical Studies
- Meteorological Phenomena and Simulations
- Soil Moisture and Remote Sensing
- Statistical and numerical algorithms
- Atmospheric and Environmental Gas Dynamics
- earthquake and tectonic studies
- Spacecraft and Cryogenic Technologies
- Astro and Planetary Science
- Geophysical and Geoelectrical Methods
- Geology and Paleoclimatology Research
- Seismic Imaging and Inversion Techniques
- Advanced Computational Techniques and Applications
- Hydrology and Watershed Management Studies
GFZ Helmholtz Centre for Geosciences
2016-2025
Potsdam Institute for Climate Impact Research
2024
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2022
University of Potsdam
2010-2012
Technische Universität Dresden
2005-2007
Abstract Since June, 2018, the Gravity Recovery and Climate Experiment Follow‐On (GRACE‐FO) is extending 15‐year monthly mass change record of GRACE mission, which ended in June 2017. The GRACE‐FO instrument flight system performance has improved over GRACE. Better attitude solutions enhanced pointing result reduced fuel consumption gravity range rate post‐fit residuals. One accelerometer requires additional calibrations due to unexpected measurement noise. fields from 2018 through December...
The release 06 (RL06) of the Gravity Recovery and Climate Experiment (GRACE) Atmosphere Ocean De-Aliasing Level-1B (AOD1B) product has been prepared for use as a time-variable background model in global gravity research. Available since year 1976 with temporal resolution 3 hr, is provided Stokes coefficients up to degree order 180. RL06 separates tidal non-tidal signals, an improved long-term consistency due introduction time-invariant reference orography continental regions. Variance...
High‐resolution load‐induced crustal deformations calculated from numerical models are tested for their ability to predict hydrologically‐induced station height variability, as they known be large enough affect epoch‐wise parameters obtained the analysis of global geodetic networks. Loading contributions due terrestrial water storage given by hydrological on a 0.5° regular grid with daily temporal resolution. Apart dominant seasonal variations, loading signal discloses also rapid changes...
In 2018 we celebrated 25 years of development radar altimetry, and the progress achieved by this methodology in fields global coastal oceanography, hydrology, geodesy cryospheric sciences. Many symbolic major events have these developments, e.g., Venice, Italy, 15th (2006) 20th (2012) more recently, 2018, Ponta Delgada, Portugal, Years Progress Radar Altimetry. On latter occasion it was decided to collect contributions scientists, engineers managers involved worldwide altimetry community...
Abstract The GRACE‐FO satellites launched in May 2018 are able to quantify the water mass deficit Central Europe during two consecutive summer droughts of and 2019. Relative long‐term climatology, deficits were − 112 ± 10.5 Gt 145 12 These 73% 94% mean amplitude seasonal storage variations, which is so severe that a recovery cannot be expected within 1 year. 2019 largest whole GRACE time span. Globally, data do not show an offset between missions, proves successful continuation by thus...
[1] An improved version of the OMCT ocean model with 1° spatial resolution provides bottom pressure anomalies for new release 05 GRACE Atmosphere and Ocean Dealiasing Level 1B (AOD1B) product. For high-frequency signals periods below 30 days, this explains up to 10 cm2 residual sea level variance seen by ENVISAT in large parts Southern Ocean, corresponding about 40% observed residuals many open regions away from tropics. Comparable amounts are also explained AOD1B RL05 colocated situ...
Time-variable gravity field models derived from observations of the Gravity Recovery and Climate Experiment (GRACE) mission, whose science operations phase ended in June 2017 after more than 15 years, enabled a multitude studies Earth’s surface mass transport processes climate change. The German Research Centre for Geosciences (GFZ), routinely processing such monthly fields as part GRACE Science Data System, has reprocessed complete mission released an improved GFZ RL06 time series. This...
Abstract Predicting Earth Orientation Parameters (EOP) is crucial for precise positioning and navigation both on the Earth’s surface in space. In recent years, many approaches have been developed to forecast EOP, incorporating observed EOP as well information effective angular momentum (EAM) derived from numerical models of atmosphere, oceans, land-surface dynamics. The Second Prediction Comparison Campaign (2nd PCC) aimed comprehensively evaluate forecasts international participants...
Effective angular momentum functions from atmosphere, oceans, and terrestrial water storage are obtained European Centre for Medium‐Range Weather Forecasts atmospheric data corresponding simulations with the Ocean Model Circulation Tides Land Surface Discharge (LSDM). Mass exchanges among subsystems realized by means of freshwater fluxes, causing total ocean mass to vary predominantly annually. Variations in affect oceanic excitations annual wobble almost 1 milliarc second (mas) both...
Abstract Changes in terrestrial water storage as observed by the satellite gravity mission GRACE (Gravity Recovery and Climate Experiment) represent a new completely independent way to constrain net flux imbalance atmospheric reanalyses. In this study daily field changes are used for first time investigate high-frequency hydro-meteorological fluxes over continents. Band-pass filtered derived from series applying numerical differentiation filter subsequent high-pass filtering isolate at...
Recently reprocessed GRACE gravity fields are found to provide reliable ocean mass anomalies down 500 km regional averages when comparing them observations obtained from sterically corrected Jason 1 altimetry and simulated derived the Ocean Model for Circulation Tides (OMCT). Beside assessment of systematic shortcomings GRACE, OMCT estimates, robust signals in North Pacific various regions Southern identified all three independent data sets. Correlations up 0.8 rms values differences around...
Abstract. Estimates of terrestrial water storage (TWS) variations from the Gravity Recovery and Climate Experiment (GRACE) satellite mission are used to assess accuracy four global numerical model realizations that simulate continental branch cycle. Based on different validation metrics, we demonstrate for 31 largest discharge basins worldwide all runs agree with observations a very limited degree only, together large spreads among models themselves. Since apply common atmospheric forcing...
Abstract Coupled climate models participating in the CMIP5 (Coupled Model Intercomparison Project Phase 5) exhibit a large intermodel spread representation of long‐term trends soil moisture and snow response to anthropogenic change. We evaluate (January 1861 December 2099) water storage from 21 against observed terrestrial (TWS) obtained 14 years (April 2002 August 2016) GRACE (Gravity Recovery And Climate Experiment) satellite mission. This is complicated due incomplete TWS interannual...
Abstract Gravitationally consistent solutions of the Sea Level Equation from leakage‐corrected monthly‐mean GFZ RL06 Gravity Recovery and Climate Experiment (GRACE) GRACE Follow‐On (GRACE‐FO) Stokes coefficients reveal that barystatic sea level averaged over whole global ocean was rising by 1.72 mm a −1 during period April 2002 until August 2016. This rate refers to truely averaging domain includes all polar semienclosed seas. The result corresponds 2.02 mean rise in open with 1,000 km...
Abstract The application of terrestrial water storage (TWS) data observed with GRACE and GRACE‐FO often requires realistic uncertainties. For gridded TWS data, this the knowledge covariances, which can be derived from formal, i.e., formally estimated in parameter estimation, variance‐covariance matrix provided together Stokes coefficients. However, propagation monthly matrices to is computationally expensive, so we apply a spatial covariance model for data. provides non‐homogeneous (location...
Abstract The Atmosphere and Ocean De‐Aliasing Level‐1B (AOD1B) product provides a priori information about temporal variations in the Earth's gravity field induced by non‐tidal circulation processes atmosphere ocean. It is routinely applied as background model Gravity Recovery Climate Experiment (GRACE)/GRACE Follow‐On (GRACE‐FO) satellite gravimetry data processing. We here present three new datasets preparation for upcoming release RL07 of AOD1B, that are based on either global ERA5...
Abstract Rapid provision of Earth orientation parameters (EOPs, here polar motion and dUT1) is indispensable in many geodetic applications also for spacecraft navigation. There are, however, discrepancies between the rapid EOPs final that have a higher latency but highest accuracy. To reduce these discrepancies, we focus on data‐driven approach, present novel method named ResLearner, use it context deep ensemble learning. Furthermore, introduce geophysically constrained approach ResLearner....