Articles | Volume 11, issue 2
https://doi.org/10.5194/essd-11-647-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-11-647-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
ICGEM – 15 years of successful collection and distribution of global gravitational models, associated services, and future plans
E. Sinem Ince
CORRESPONDING AUTHOR
Section 1.2: Global Geomonitoring and Gravity Field, GFZ German Research Centre for Geosciences, Potsdam, Germany
Franz Barthelmes
Section 1.2: Global Geomonitoring and Gravity Field, GFZ German Research Centre for Geosciences, Potsdam, Germany
Sven Reißland
Section 1.2: Global Geomonitoring and Gravity Field, GFZ German Research Centre for Geosciences, Potsdam, Germany
Kirsten Elger
Library and Information Services, GFZ German Research Centre for Geosciences, Potsdam, Germany
Christoph Förste
Section 1.2: Global Geomonitoring and Gravity Field, GFZ German Research Centre for Geosciences, Potsdam, Germany
Frank Flechtner
Section 1.2: Global Geomonitoring and Gravity Field, GFZ German Research Centre for Geosciences, Potsdam, Germany
Department of Geodesy and Geoinformation Science, Technical University of Berlin, Berlin, Germany
Harald Schuh
Section 1.1: Space Geodetic Techniques, GFZ German Research Centre for Geosciences, Potsdam, Germany
Department of Geodesy and Geoinformation Science, Technical University of Berlin, Berlin, Germany
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Çağatay Çakan, M. Tuğrul Yılmaz, Henryk Dobslaw, E. Sinem Ince, Fatih Evrendilek, Christoph Förste, and Ali Levent Yağcı
EGUsphere, https://doi.org/10.5194/egusphere-2024-2616, https://doi.org/10.5194/egusphere-2024-2616, 2024
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This study evaluates the accuracy of GPCC and GPCP precipitation products by estimating hydrological drought recovery time (DRT) using satellite gravimetry data. Findings show that DRT estimates for GPCC and GPCP are similar, while JPL mascon gives longer DRT than G3P. Results show that G3P provides more consistent DRT estimates than JPL mascon across climate zones. These results enhance understanding of precipitation and water storage, crucial for meteorological and hydrological research.
Çağatay Çakan, M. Tuğrul Yılmaz, Henryk Dobslaw, E. Sinem Ince, Fatih Evrendilek, Christoph Förste, and Ali Levent Yağcı
EGUsphere, https://doi.org/10.5194/egusphere-2024-2616, https://doi.org/10.5194/egusphere-2024-2616, 2024
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This study evaluates the accuracy of GPCC and GPCP precipitation products by estimating hydrological drought recovery time (DRT) using satellite gravimetry data. Findings show that DRT estimates for GPCC and GPCP are similar, while JPL mascon gives longer DRT than G3P. Results show that G3P provides more consistent DRT estimates than JPL mascon across climate zones. These results enhance understanding of precipitation and water storage, crucial for meteorological and hydrological research.
Christoph Dahle, Eva Boergens, Ingo Sasgen, Thorben Döhne, Sven Reißland, Henryk Dobslaw, Volker Klemann, Michael Murböck, Rolf König, Robert Dill, Mike Sips, Ulrike Sylla, Andreas Groh, Martin Horwath, and Frank Flechtner
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2024-347, https://doi.org/10.5194/essd-2024-347, 2024
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The satellite missions GRACE and GRACE-FO are unique observing systems to quantify global mass changes at the Earth’s surface from space. Time series of these mass changes are of high value for various applications, e.g., in hydrology, glaciology, and oceanography. GravIS provides easy access to user-friendly, regularly updated mass anomaly products. The associated portal visualizes and describes these data, aiming to highlight their significance for understanding changes in the climate system.
S. Naderi Salim, M. M. Alizadeh, S. Chamankar, and H. Schuh
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., X-4-W1-2022, 575–580, https://doi.org/10.5194/isprs-annals-X-4-W1-2022-575-2023, https://doi.org/10.5194/isprs-annals-X-4-W1-2022-575-2023, 2023
S. Nasr-Azadani, M.M. Alizadeh, and H. Schuh
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., X-4-W1-2022, 595–602, https://doi.org/10.5194/isprs-annals-X-4-W1-2022-595-2023, https://doi.org/10.5194/isprs-annals-X-4-W1-2022-595-2023, 2023
Chaiyaporn Kitpracha, Robert Heinkelmann, Markus Ramatschi, Kyriakos Balidakis, Benjamin Männel, and Harald Schuh
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-238, https://doi.org/10.5194/amt-2022-238, 2022
Preprint withdrawn
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In this study, we expected to learn what are the potential effects of GNSS atmospheric delays from this unique experiment. The results show that the instrument effects on GNSS zenith delays were mitigated by using the same instrument. The radome causes unexpected bias of GNSS zenith delays in this study. In order to calibrate the instrumental effects, we set up the GNSS co-location site experiment to demonstrate calibrating GNSS instrumental effects.
Christian Voigt, Karsten Schulz, Franziska Koch, Karl-Friedrich Wetzel, Ludger Timmen, Till Rehm, Hartmut Pflug, Nico Stolarczuk, Christoph Förste, and Frank Flechtner
Hydrol. Earth Syst. Sci., 25, 5047–5064, https://doi.org/10.5194/hess-25-5047-2021, https://doi.org/10.5194/hess-25-5047-2021, 2021
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A continuously operating superconducting gravimeter at the Zugspitze summit is introduced to support hydrological studies of the Partnach spring catchment known as the Zugspitze research catchment. The observed gravity residuals reflect total water storage variations at the observation site. Hydro-gravimetric analysis show a high correlation between gravity and the snow water equivalent, with a gravimetric footprint of up to 4 km radius enabling integral insights into this high alpine catchment.
Benjamin Männel, Florian Zus, Galina Dick, Susanne Glaser, Maximilian Semmling, Kyriakos Balidakis, Jens Wickert, Marion Maturilli, Sandro Dahlke, and Harald Schuh
Atmos. Meas. Tech., 14, 5127–5138, https://doi.org/10.5194/amt-14-5127-2021, https://doi.org/10.5194/amt-14-5127-2021, 2021
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Within the MOSAiC expedition, GNSS was used to monitor variations in atmospheric water vapor. Based on 15 months of continuously tracked data, coordinates and hourly zenith total delays (ZTDs) were determined using kinematic precise point positioning. The derived ZTD values agree within few millimeters with ERA5 and terrestrial GNSS and VLBI stations. The derived integrated water vapor corresponds to the frequently launched radiosondes (0.08 ± 0.04 kg m−2, rms of the differences of 1.47 kg m−2).
Chaiyaporn Kitpracha, Robert Heinkelmann, Markus Ramatschi, Kyriakos Balidakis, Benjamin Männel, and Harald Schuh
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2021-87, https://doi.org/10.5194/amt-2021-87, 2021
Preprint withdrawn
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In this study, we expected to learn what are the potential effects of GNSS atmospheric delays from this unique experiment. The results show that the instrument effects on GNSS zenith delays were mitigated by using the same instrument. The radome causes unexpected bias of GNSS zenith delays in this study. Additionally, multipath effects at low-elevation observations degraded the tropospheric east gradients.
Xiao Chang, Benjamin Männel, and Harald Schuh
Adv. Geosci., 55, 33–45, https://doi.org/10.5194/adgeo-55-33-2021, https://doi.org/10.5194/adgeo-55-33-2021, 2021
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This study focuses on the comparison of different solar radiation pressure (SRP) strategies combined with a-priori information and empirical SRP parameterization. Analysis of precise orbits as well as estimated empirical SRP parameters based on various SRP strategies shows visible differences and indicates the deficiencies of a-priori model or empirical parameterization. The orbit difference patterns presented in this study may give the view on how to improve the current SRP models.
Mirko Reguzzoni, Daniela Carrion, Carlo Iapige De Gaetani, Alberta Albertella, Lorenzo Rossi, Giovanna Sona, Khulan Batsukh, Juan Fernando Toro Herrera, Kirsten Elger, Riccardo Barzaghi, and Fernando Sansó
Earth Syst. Sci. Data, 13, 1653–1666, https://doi.org/10.5194/essd-13-1653-2021, https://doi.org/10.5194/essd-13-1653-2021, 2021
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The International Service for the Geoid provides free access to a repository of geoid models. The most important ones are freely available to perform analyses on the evolution of the geoid computation research field. Furthermore, the ISG performs research taking advantage of its archive and organizes specific training courses on geoid determination. This paper aims at describing the service and showing the added value of the archive of geoid models for the scientific community and technicians.
Friederike Koerting, Nicole Koellner, Agnieszka Kuras, Nina Kristin Boesche, Christian Rogass, Christian Mielke, Kirsten Elger, and Uwe Altenberger
Earth Syst. Sci. Data, 13, 923–942, https://doi.org/10.5194/essd-13-923-2021, https://doi.org/10.5194/essd-13-923-2021, 2021
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Mineral resource exploration and mining is an essential part of today's high-tech industry. Modern remote-sensing exploration techniques from multiple platforms (e.g., satellite) to detect the spectral characteristics of the surface require spectral libraries as an essential reference. To enable remote mapping, the spectral libraries for rare-earth-bearing minerals, copper-bearing minerals and surface samples from a copper mine are presented here with their corresponding geochemical validation.
Martin Lasser, Ulrich Meyer, Adrian Jäggi, Torsten Mayer-Gürr, Andreas Kvas, Karl Hans Neumayer, Christoph Dahle, Frank Flechtner, Jean-Michel Lemoine, Igor Koch, Matthias Weigelt, and Jakob Flury
Adv. Geosci., 55, 1–11, https://doi.org/10.5194/adgeo-55-1-2020, https://doi.org/10.5194/adgeo-55-1-2020, 2020
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Correctly determining the orbit of Earth-orbiting satellites requires to account multiple background effects which appear in the system Earth. Usually, these effects are introduced by various complex force models, which are not always easy to handle. We publish and validate a data set of commonly used models to make it easier to track down potential issues when applying such background forces in orbit and gravity field determination.
Zhilu Wu, Yanxiong Liu, Yang Liu, Jungang Wang, Xiufeng He, Wenxue Xu, Maorong Ge, and Harald Schuh
Atmos. Meas. Tech., 13, 4963–4972, https://doi.org/10.5194/amt-13-4963-2020, https://doi.org/10.5194/amt-13-4963-2020, 2020
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The HY-2A calibration microwave radiometer (CMR) water vapor product is validated using ground-based GNSS observations along the coastline and shipborne GNSS observations over the Indian Ocean. The validation result shows that HY-2A CMR PWV agrees well with ground-based GNSS PWV, with 2.67 mm in rms within 100 km and an RMS of 1.57 mm with shipborne GNSS for the distance threshold of 100 km. Ground-based GNSS and shipborne GNSS agree with HY-2A CMR well.
Ankur Kepkar, Christina Arras, Jens Wickert, Harald Schuh, Mahdi Alizadeh, and Lung-Chih Tsai
Ann. Geophys., 38, 611–623, https://doi.org/10.5194/angeo-38-611-2020, https://doi.org/10.5194/angeo-38-611-2020, 2020
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The paper focuses on the analyses of the global occurrence of equatorial plasma bubble events using S4 data that were calculated from GPS radio occultation measurements of the FormoSat-3/COSMIC mission. The advantage in using radio occultation data is that we get information not only on the occurrence and intensity of the equatorial bubble events, but also on the altitude distribution. We analyzed a 10.5-year time series of COSMIC data and demonstrated a strong dependence on the solar cycle.
Gustavo Mansur, Pierre Sakic, Benjamin Männel, and Harald Schuh
Adv. Geosci., 50, 57–64, https://doi.org/10.5194/adgeo-50-57-2020, https://doi.org/10.5194/adgeo-50-57-2020, 2020
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Nowadays, new GNSS, like European Galileo or Chinese Beidou are available. Some members of the International GNSS Service (IGS) provide multi-GNSS precise satellite orbits, but no final orbit combination exists yet. We developed a new algorithm to combine satellite orbits for all GNSS constellations. Two different strategies were applied. To validate our results we compared our GPS orbits with the official IGS orbits. Our results show that the best strategy applied reached an agreement ~15 mm.
S. Khajeh, A. A. Ardalan, and H. Schuh
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-4-W18, 597–603, https://doi.org/10.5194/isprs-archives-XLII-4-W18-597-2019, https://doi.org/10.5194/isprs-archives-XLII-4-W18-597-2019, 2019
Ben T. Gouweleeuw, Andreas Kvas, Christian Gruber, Animesh K. Gain, Thorsten Mayer-Gürr, Frank Flechtner, and Andreas Güntner
Hydrol. Earth Syst. Sci., 22, 2867–2880, https://doi.org/10.5194/hess-22-2867-2018, https://doi.org/10.5194/hess-22-2867-2018, 2018
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Daily GRACE gravity field solutions have been evaluated against daily river runoff data for major flood events in the Ganges–Brahmaputra Delta in 2004 and 2007. Compared to the monthly gravity field solutions, the trends over periods of a few days in the daily gravity field solutions are able to reflect temporal variations in river runoff during major flood events. This implies that daily gravity field solutions released in near-real time may support flood monitoring for large events.
Cuixian Lu, Florian Zus, Maorong Ge, Robert Heinkelmann, Galina Dick, Jens Wickert, and Harald Schuh
Atmos. Meas. Tech., 9, 5965–5973, https://doi.org/10.5194/amt-9-5965-2016, https://doi.org/10.5194/amt-9-5965-2016, 2016
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The recent dramatic development of multi-GNSS constellations brings great opportunities and potential for more enhanced precise positioning, navigation, timing, and other applications. In this contribution, we develop a numerical weather model (NWM) constrained PPP processing system to improve the multi-GNSS precise positioning. Compared to the standard PPP solution, significant improvements of both convergence time and positioning accuracy are achieved with the NWM-constrained PPP solution.
B. K. Biskaborn, J.-P. Lanckman, H. Lantuit, K. Elger, D. A. Streletskiy, W. L. Cable, and V. E. Romanovsky
Earth Syst. Sci. Data, 7, 245–259, https://doi.org/10.5194/essd-7-245-2015, https://doi.org/10.5194/essd-7-245-2015, 2015
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This paper introduces the new database of the Global Terrestrial Network for Permafrost (GTN-P) on permafrost temperature and active layer thickness data. It describes the operability of the Data Management System and the data quality. By applying statistics on GTN-P metadata, we analyze the spatial sample representation of permafrost monitoring sites. Comparison with environmental variables and climate projection data enable identification of potential future research locations.
Related subject area
Geosciences – Geodesy
HydroSat: geometric quantities of the global water cycle from geodetic satellites
The cooperative IGS RT-GIMs: a reliable estimation of the global ionospheric electron content distribution in real time
RECOG RL01: correcting GRACE total water storage estimates for global lakes/reservoirs and earthquakes
Open access to regional geoid models: the International Service for the Geoid
GOCO06s – a satellite-only global gravity field model
Description of the multi-approach gravity field models from Swarm GPS data
Mohammad J. Tourian, Omid Elmi, Yasin Shafaghi, Sajedeh Behnia, Peyman Saemian, Ron Schlesinger, and Nico Sneeuw
Earth Syst. Sci. Data, 14, 2463–2486, https://doi.org/10.5194/essd-14-2463-2022, https://doi.org/10.5194/essd-14-2463-2022, 2022
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HydroSat as a global water cycle database provides estimates of and uncertainty in geometric quantities of the water cycle: (1) surface water extent of lakes and rivers, (2) water level time series of lakes and rivers, (3) terrestrial water storage anomaly, (4) water storage anomaly of lakes and reservoirs, and (5) river discharge estimates for large and small rivers.
Qi Liu, Manuel Hernández-Pajares, Heng Yang, Enric Monte-Moreno, David Roma-Dollase, Alberto García-Rigo, Zishen Li, Ningbo Wang, Denis Laurichesse, Alexis Blot, Qile Zhao, Qiang Zhang, André Hauschild, Loukis Agrotis, Martin Schmitz, Gerhard Wübbena, Andrea Stürze, Andrzej Krankowski, Stefan Schaer, Joachim Feltens, Attila Komjathy, and Reza Ghoddousi-Fard
Earth Syst. Sci. Data, 13, 4567–4582, https://doi.org/10.5194/essd-13-4567-2021, https://doi.org/10.5194/essd-13-4567-2021, 2021
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The upper part of the atmosphere, the ionosphere, is partially ionized, and it is being crossed by many multi-frequency signals of the Global Navigation Satellite System (GNSS) satellites. This unique source of data can be acquired in real time from hundreds of permanent GNSS receivers. The real-time processing providing the distribution of the ionospheric free electrons (Global Ionospheric Maps) can be done as well in real time. We present their updated real-time assessment and combination.
Simon Deggim, Annette Eicker, Lennart Schawohl, Helena Gerdener, Kerstin Schulze, Olga Engels, Jürgen Kusche, Anita T. Saraswati, Tonie van Dam, Laura Ellenbeck, Denise Dettmering, Christian Schwatke, Stefan Mayr, Igor Klein, and Laurent Longuevergne
Earth Syst. Sci. Data, 13, 2227–2244, https://doi.org/10.5194/essd-13-2227-2021, https://doi.org/10.5194/essd-13-2227-2021, 2021
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GRACE provides us with global changes of terrestrial water storage. However, the data have a low spatial resolution, and localized storage changes in lakes/reservoirs or mass change due to earthquakes causes leakage effects. The correction product RECOG RL01 presented in this paper accounts for these effects. Its application allows for improving calibration/assimilation of GRACE into hydrological models and better drought detection in earthquake-affected areas.
Mirko Reguzzoni, Daniela Carrion, Carlo Iapige De Gaetani, Alberta Albertella, Lorenzo Rossi, Giovanna Sona, Khulan Batsukh, Juan Fernando Toro Herrera, Kirsten Elger, Riccardo Barzaghi, and Fernando Sansó
Earth Syst. Sci. Data, 13, 1653–1666, https://doi.org/10.5194/essd-13-1653-2021, https://doi.org/10.5194/essd-13-1653-2021, 2021
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The International Service for the Geoid provides free access to a repository of geoid models. The most important ones are freely available to perform analyses on the evolution of the geoid computation research field. Furthermore, the ISG performs research taking advantage of its archive and organizes specific training courses on geoid determination. This paper aims at describing the service and showing the added value of the archive of geoid models for the scientific community and technicians.
Andreas Kvas, Jan Martin Brockmann, Sandro Krauss, Till Schubert, Thomas Gruber, Ulrich Meyer, Torsten Mayer-Gürr, Wolf-Dieter Schuh, Adrian Jäggi, and Roland Pail
Earth Syst. Sci. Data, 13, 99–118, https://doi.org/10.5194/essd-13-99-2021, https://doi.org/10.5194/essd-13-99-2021, 2021
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Earth's gravity field provides invaluable insights into the state and changing nature of our planet. GOCO06s combines over 1 billion measurements from 19 satellites to produce a global gravity field model. The combination of different observation principles allows us to exploit the strengths of each satellite mission and provide a high-quality data set for Earth and climate sciences.
João Teixeira da Encarnação, Pieter Visser, Daniel Arnold, Aleš Bezdek, Eelco Doornbos, Matthias Ellmer, Junyi Guo, Jose van den IJssel, Elisabetta Iorfida, Adrian Jäggi, Jaroslav Klokocník, Sandro Krauss, Xinyuan Mao, Torsten Mayer-Gürr, Ulrich Meyer, Josef Sebera, C. K. Shum, Chaoyang Zhang, Yu Zhang, and Christoph Dahle
Earth Syst. Sci. Data, 12, 1385–1417, https://doi.org/10.5194/essd-12-1385-2020, https://doi.org/10.5194/essd-12-1385-2020, 2020
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Although not the primary mission of the Swarm three-satellite constellation, the sensors on these satellites are accurate enough to measure the melting and accumulation of Earth’s ice reservoirs, precipitation cycles, floods, and droughts, amongst others. Swarm sees these changes well compared to the dedicated GRACE satellites at spatial scales of roughly 1500 km. Swarm confirms most GRACE observations, such as the large ice melting in Greenland and the wet and dry seasons in the Amazon.
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Short summary
ICGEM is a non-profit scientific service that contributes to any research area in which the use of gravity information is essential. ICGEM offers the largest collection of global gravity field models, interactive calculation and visualisation services and delivers high-quality datasets to researchers and students in geodesy, geophysics, glaciology, hydrology, oceanography, and climatology and most importantly general public. Static, temporal, and topographic gravity field models are available.
ICGEM is a non-profit scientific service that contributes to any research area in which the use...
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