Article
Geochemistry & Geophysics
Benjamin F. Chao
Summary: The aim of this paper is to determine the mass density distribution of a central body by gravitational inversion. The 2-D inversion is unique on a spherical surface, while the 3-D inversion is non-unique. In this paper, the unique 2-D gravitational inversion on an arbitrary surface is mathematically proven, and an algorithm is derived for the exact 2-D mass distribution solution.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
E. S. Tucker, R. S. Nerem, B. D. Loomis
Summary: Satellite laser ranging (SLR) is crucial for estimating Earth's low-degree gravity field. The current SLR ground network is unevenly distributed and has variations in data quantity and quality. Adding new stations can improve the precision of SLR measurements, particularly in the Southern hemisphere.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Sungchan Choi, Sung-Wook Kim, Eun-Kyeong Choi, Young-Cheol Lee
Summary: The Jeokjung-Chogye Basin (JCB) is the first impact crater discovered in the Korean peninsula. The geometric center of the exterior crater rim is marked by an elevation higher than 200 meters. The diameters of the peak ring and uplift ring are calculated to be approximately 4000 and 1500 meters respectively, with a depth discrepancy of around 200 meters indicating a rise in bedrock under the uplift ring following the meteorite impact.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Sungchan Choi, Sung-Wook Kim, Eun-Kyeong Choi, Young-Cheol Lee
Summary: The Jeokjung-Chogye Basin (JCB) is the first impact crater discovered in the Korean peninsula, with a complex geological structure consisting of multiple ring structures on the exterior crater rim. Analysis of geological features and gravity field data suggests that the crater was formed by a steeply inclined impact from the eastern direction at 50-60 degrees to the horizontal.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Osama Elghrabawy, Khaled Khalifa
Summary: This study presents a 3-D stripping inversion over the Hodein Basin area in the Southeastern Desert using the Fourier approach and evaluates the method based on data constraints. The results show that the study area is characterized by a broad basin directed in the NW direction and dissected by normal faults, forming small subbasins.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Yao Yu, David T. Sandwell, Sarah T. Gille, Ana Beatriz Villas Boas
Summary: The study assessed the ability of ICESat-2 ocean data to recover oceanographic signals, showing that it can recover marine geoid wavelengths >20 km, but with higher than expected artificial power in the 3-20 km wavelength band.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Yixiati Dilixiati, Eldar Baykiev, Joerg Ebbing
Summary: A novel approach combining aeromagnetic and satellite data is proposed, involving inversion for magnetic parameters and conversion into spherical harmonics. Testing on Magnetic Anomaly Maps of Australia shows good agreement with satellite data when replacing long-wavelength aeromagnetic data with satellite data.
Article
Geochemistry & Geophysics
Christian Olaf Mueller, Jacob Waechter, Christoph Jahnke, Emilio L. Pueyo Morer, Florian Riefstahl, Alexander Malz
Summary: This study presents an integrated geological and gravity modelling approach to harmonize two geological 3D models of the North German Basin in the cross-border region between Saxony-Anhalt and Brandenburg. Gravity gradient calculation and Euler deconvolution are used to reveal new insights into local fault systems and gravity anomaly sources. The resulting geological 3D model consists of harmonized interfaces and is consistent with the observed gravity field.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
A. Koulali, P. J. Clarke
Summary: In this study, a Gaussian process is used to model quasi-periodic signals in geodetic time-series, capturing variability structure using covariance functions. The method provides a better fit to the time-series, with fewer systematic effects, as evaluated using the Markov Chain Monte Carlo method. This approach proves effective for estimating secular velocities of GPS sites and Gravity Recovery and Climate Experiment time-series.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Stefan Schroeder, Simon Stellmer, Juergen Kusche
Summary: The GRACE and GRACE-FO missions have quantified large-scale changes in the water cycle, while stationary optical clocks continue to improve in stability. This study proposes utilizing a network of clocks to sense large-scale temporal geopotential changes and suggests establishing a European clock network to validate satellite missions like GRACE-FO. Simulation results show that significant hydrological and atmospheric variations over Europe could be observed with clock comparisons even under conservative assumptions for uncertainties.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Environmental Sciences
Lei Liang, Jinhai Yu, Changqing Wang, Min Zhong, Wei Feng, Xiaoyun Wan, Wei Chen, Yihao Yan
Summary: The study discusses the importance of considering the low-frequency error of the residual orbit when recovering a time-variable gravity field, and demonstrates that removing this error can improve the accuracy and consistency of the gravity field model estimation.
Article
Environmental Sciences
Mohsen Feizi, Mehdi Raoofian Naeeni, Jakob Flury
Summary: This study develops a time-variable regional geopotential model for Antarctica using the spherical cap harmonic analysis (SCHA) basis functions. The model is derived from line-of-sight gravity difference (LGD) measurements obtained from the GRACE-Follow-On (GFO) mission. The results show that the use of regional harmonic basis functions, specifically SCHA functions, provides a close estimation of LGD compared to the L2 JPL and improves the accuracy of the gravitational signal within a spherical cap region.
Article
Geosciences, Multidisciplinary
F. J. Lobo, A. Lopez-Quiros, F. J. Hernandez-Molina, L. F. Perez, M. Garcia, D. Evangelinos, F. Bohoyo, J. Rodriguez-Fernandez, A. Salabarnada, A. Maldonado
Summary: Multibeam bathymetric imagery and acoustic sub-bottom profiles are used to study the distribution patterns of subsurface sedimentation in Dove Basin (Scotia Sea), focusing on the imprint of deep Antarctic water masses, factors driving contourite deposition styles and the contribution of alongslope versus downslope processes. The morpho-sedimentary features in Dove Basin are primarily related to contouritic processes and mass movements.
Article
Multidisciplinary Sciences
Sarfaraz Newaz, Md Toki Tahmid, Nadia Al-Aboody, A. B. M. Alim Al Islam
Summary: This paper presents a novel method for predicting petroleum deposit locations, utilizing data from the GRACE satellite to calculate the earth's gravity gradient tensor and applying machine learning, graph-based analysis, and a newly-proposed OR-nAND method. The study successfully predicted 25 out of 26 existing petroleum deposits in Iraq and identified prospective deposits for further exploration. The generalized approach demonstrated in this study can be applied worldwide.
SCIENTIFIC REPORTS
(2023)
Article
Geochemistry & Geophysics
Wei-Kai Li, Qing-Lu Mu, Meng Yang, Wei Feng, Min Zhong
Summary: Mo determination is important for studying the Earth's interior structure, and can be recovered using gravimetric data based on the isostasy-compensation hypothesis in geodesy. An improved iterative inversion method combining 3-D integration and linear regularization is proposed to solve the nonlinear problem of isostasy. Two joint inversion scenarios utilizing horizontal components and all non-vertical components of the gravity-gradient tensor from GOCE are developed. The study provides new insights into the tectonic structure of the Qinghai-Tibet Plateau based on high-precision satellite gravimetry.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Engineering, Aerospace
Julian Zeitlhoefler, Mathis Blossfeld, Sergei Rudenko, Denise Dettmering, Florian Seitz
Summary: The TOPEX/Poseidon (T/P) altimetry mission is important for monitoring global and regional sea level variations and ocean circulation. A correction function is developed to counteract measurement errors and improve the orbit accuracy of the spacecraft.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Geochemistry & Geophysics
Alexander Kehm, Hendrik Hellmers, Mathis Blossfeld, Robert Dill, Detlef Angermann, Florian Seitz, Urs Hugentobler, Henryk Dobslaw, Maik Thomas, Daniela Thaller, Johannes Bohm, Erik Schonemann, Volker Mayer, Tim Springer, Michiel Otten, Sara Bruni, Werner Enderle
Summary: Accurate knowledge of the Earth's orientation and rotation is crucial for scientific and societal applications such as global positioning, navigation, and geodynamic studies. This paper presents an improved strategy for processing and combining various observations to enhance the consistency of Earth rotation parameter (ERP) solutions. By implementing this strategy, the study achieves more accurate and consistent ERP solutions, supporting the goals of the Global Geodetic Observing System (GGOS) in providing precise geodetic parameters for science and applications.
JOURNAL OF GEODESY
(2023)
Review
Geochemistry & Geophysics
Vincent Humphrey, Matthew Rodell, Annette Eicker
Summary: Land water storage is essential for the Earth's climate, natural ecosystems, and human activities. Since the launch of the first GRACE mission in 2002, satellite observations of changes in terrestrial water storage have provided a global perspective on freshwater resources. However, these datasets have limitations that may not be clear to users unfamiliar with the processing algorithms. This overview aims to provide accessible information on measurement concepts, data products, and recommendations for utilizing the data in interdisciplinary contexts.
SURVEYS IN GEOPHYSICS
(2023)
Article
Environmental Sciences
Florian Schlembach, Frithjof Ehlers, Marcel Kleinherenbrink, Marcello Passaro, Denise Dettmering, Florian Seitz, Cornelis Slobbe
Summary: Estimating geophysical variables from satellite altimetry in the coastal zone is challenging due to interference from reflective targets. This study assesses the applicability of fully focused synthetic aperture radar (FF-SAR) processed data to obtain accurate significant wave height (SWH) estimates close to the coast.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
Daniel Scherer, Christian Schwatke, Denise Dettmering, Florian Seitz
Summary: The ICESat-2 River Surface Slope (IRIS) dataset provides average and extreme water surface slopes (WSS) derived from ICESat-2 observations as a supplement to the SWOT Mission River Database (SWORD) in the period from October 2018 to August 2022. To utilize the unique measurement geometry of ICESat-2, the WSS is determined based on the intersection angle between spacecraft orbit and river centerline, utilizing pairs of beams or individual beams. This dataset can be used for research on river dynamics, estimation of river discharge, and correction of water level time series from satellite altimetry.
Article
Ecology
Johanna Kauffert, Sophie Baur, Michael Matiu, Andreas Koenig, Wibke Peters, Annette Menzel
Summary: Spring mowing in May and June is a major factor in the death of roe deer fawns in agricultural areas. Knowing the precise distribution of fawn births is crucial in guiding farmers to take precautions before mowing to prevent fawn deaths. Wildlife volunteers can act as citizen scientists by searching fields before mowing and providing data sets of rescued fawns and their approximate age at the time of rescue. However, the use of weather-dependent searches can lead to skewed birth distributions. Two algorithms were introduced to reconstruct reliable birth distribution parameters based on skewed samples, resulting in better estimates of mean and standard deviation values.
ECOLOGICAL SOLUTIONS AND EVIDENCE
(2023)
Article
Environmental Sciences
Andreas Wieser, Andreas Guentner, Peter Dietrich, Jan Handwerker, Dina Khordakova, Uta Koedel, Martin Kohler, Hannes Mollenhauer, Bernhard Muehr, Erik Nixdorf, Marvin Reich, Christian Rolf, Martin Schroen, Claudia Schuetze, Ute Weber
Summary: Heavy Precipitation Events (HPE) occur when massive amounts of water vapor are transported to a limited area, leading to floods that can cause damage. By combining mobile and stationary observing systems, we can capture the various processes involved in HPE formation and flooding, such as atmospheric transport, precipitation patterns, and runoff dynamics.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Water Resources
Jonatan E. Pendiuk, Luis Guarracino, Marvin Reich, Andreas Guentner
Summary: A new method using superconducting gravimeter data is proposed to estimate cumulative evapotranspiration. This method calculates evapotranspiration based on precipitation data, estimated runoff, and temporal variations of gravity. The method is applied to a study site in the flatland area of Buenos Aires Province, Argentina, which has the only superconducting gravimeter in South America. The results are compared with three other estimation methods, and the accuracy of the gravity-based method is validated.
HYDROLOGICAL SCIENCES JOURNAL
(2023)
Article
Oceanography
Michael G. Hart-Davis, Stendert Laan, Christian Schwatke, Bjoern Backeberg, Denise Dettmering, Firmijn Zijl, Martin Verlaan, Marcello Passaro, Florian Seitz
Summary: With the rise in global sea level, accurate predictions of tidal height and total water levels have become crucial. This study develops a regional ocean tide model to provide better boundary forcing for a regional total water level model. The results demonstrate that the use of the developed model significantly improves the accuracy of water level estimations.
Article
Environmental Sciences
Tina Trautmann, Sujan Koirala, Andreas Guentner, Hyungjun Kim, Martin Jung
Summary: This research investigates the role of river water storage in the calibration and validation of a global hydrological model. The study finds that removing river water storage does not have significant implications for model calibration, but adding modeled river water storage improves model validation against seasonal variations obtained from GRACE satellite data.
ENVIRONMENTAL RESEARCH COMMUNICATIONS
(2023)
Article
Geosciences, Multidisciplinary
Daniel Rasche, Jannis Weimar, Martin Schroen, Markus Koehli, Markus Morgner, Andreas Guentner, Theresa Blume
Summary: Above-ground cosmic-ray neutron sensing is able to estimate soil moisture in the upper soil layers, but deeper vadose zone remains unobservable. In this study, we investigate the possibility of using cosmic-ray neutron sensing for measuring soil moisture in deeper layers of the vadose zone. Experimental setup and particle transport simulations were conducted to observe the response of downhole thermal neutron intensities to soil moisture changes at different depths. Transfer functions were derived to estimate downhole neutron signals from soil moisture information, and these functions have been proven to be applicable through in situ observations.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Maik Heistermann, Till Francke, Lena Scheiffele, Katya Dimitrova Petrova, Christian Budach, Martin Schroen, Benjamin Trost, Daniel Rasche, Andreas Guentner, Veronika Doepper, Michael Foerster, Markus Koehli, Lisa Angermann, Nikolaos Antonoglou, Manuela Zude-Sasse, Sascha E. Oswald
Summary: This paper presents the data recorded by a dense CRNS network from 2019 to 2022, consisting of permanent and temporary sensors, profiles of soil water content, groundwater observation wells, meteorological records, and GNSS-R data. Additional data were collected through mobile CRNS roving, UAS hyperspectral imagery, manual soil sampling, and biomass and snow observations. The unique 3-year temporal coverage provides a wide range of hydro-meteorological conditions and potential for various disciplines. The data set is expected to advance CRNS retrieval methods and benefit fields such as hydrology, agriculture, and remote sensing.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Geosciences, Multidisciplinary
Daniel Blank, Annette Eicker, Laura Jensen, Andreas Guentner
Summary: Water storage changes in soil can be observed globally through satellite remote sensing. By analyzing several satellite soil moisture products and non-standard daily terrestrial water storage data, it is found that deeper integration depths of soil moisture products are more strongly correlated with water storage.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Biology
Lars Uphus, Johannes Uhler, Cynthia Tobisch, Sandra Rojas-Botero, Marvin Luepke, Caryl Benjamin, Jana Englmeier, Ute Fricke, Cristina Ganuza, Maria Haensel, Sarah Redlich, Jie Zhang, Joerg Mueller, Annette Menzel
Summary: Urbanization and agricultural intensification are the main causes of recent insect decline in temperate Europe, while the direct effects of climate warming are still unclear. However, higher temperatures can lead to earlier spring leaf emergence, which may directly or indirectly affect insects. In this study, we investigated how spring temperature affects the start of season and spatial variability of green-up, and how these variables relate to insect biomass and richness across different land-use types in southern Germany. The results showed that the effects of green-up variables on insect biomass and richness varied between land-use types, with the strongest effects observed in forests. In forests, later green-up and higher spatial variability of green-up were associated with higher insect richness and biomass. We conclude that with a warming climate, earlier and more uniform green-up may negatively impact insect biomass and richness in forests. Therefore, strategies for adaptation should focus on promoting spatial variability in green-up in forests, which can be achieved by increasing plant species and structural diversity. Through this pathway, climate warming may indirectly contribute to a decline in insect richness and biomass.
COMMUNICATIONS BIOLOGY
(2023)
