Articles | Volume 29, issue 1
https://doi.org/10.5194/npg-29-53-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/npg-29-53-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
An approach for constraining mantle viscosities through assimilation of palaeo sea level data into a glacial isostatic adjustment model
Reyko Schachtschneider
CORRESPONDING AUTHOR
Earth System Modelling, Department Geodesy, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
Jan Saynisch-Wagner
Earth System Modelling, Department Geodesy, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
Volker Klemann
Earth System Modelling, Department Geodesy, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
Meike Bagge
Earth System Modelling, Department Geodesy, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
Maik Thomas
Earth System Modelling, Department Geodesy, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
Institute for Meteorology, Freie Universität Berlin, Kaiserswerther Str. 16–18, 14195 Berlin, Germany
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J. Sens. Sens. Syst., 8, 105–110, https://doi.org/10.5194/jsss-8-105-2019, https://doi.org/10.5194/jsss-8-105-2019, 2019
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Virtual experiments have become an indispensable tool for the design and the accuracy assessment of novel measurement procedures and instruments. In this paper, we present SimOptDevice, a library for opto-mechanical virtual experiments. We describe the mathematical tools used for solving the related numerical tasks and give examples of application scenarios.
Torsten Albrecht, Meike Bagge, and Volker Klemann
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We performed coupled ice sheet–solid Earth simulations and discovered a positive (forebulge) feedback mechanism for advancing grounding lines, supporting a larger West Antarctic Ice Sheet during the Last Glacial Maximum. During deglaciation we found that the stabilizing glacial isostatic adjustment feedback dominates grounding-line retreat in the Ross Sea, with a weak Earth structure. This may have consequences for present and future ice sheet stability and potential rates of sea-level rise.
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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.
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Revised manuscript under review for CP
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A fully coupled atmosphere-ocean-ice sheet-solid earth model was applied to simulate the time from the last glacial maximum to the preindustrial. The model simulations are compared to proxy data. During the glacial and deglaciation the model simulates several abrupt changes in North Atlantic climate. The underlying meachanisms are analysed and described.
Matteo Willeit, Reinhard Calov, Stefanie Talento, Ralf Greve, Jorjo Bernales, Volker Klemann, Meike Bagge, and Andrey Ganopolski
Clim. Past, 20, 597–623, https://doi.org/10.5194/cp-20-597-2024, https://doi.org/10.5194/cp-20-597-2024, 2024
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Reyko Schachtschneider, Manuel Stavridis, Ines Fortmeier, Michael Schulz, and Clemens Elster
J. Sens. Sens. Syst., 8, 105–110, https://doi.org/10.5194/jsss-8-105-2019, https://doi.org/10.5194/jsss-8-105-2019, 2019
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Linsong Wang, Liangjing Zhang, Chao Chen, Maik Thomas, and Mikhail K. Kaban
The Cryosphere Discuss., https://doi.org/10.5194/tc-2018-142, https://doi.org/10.5194/tc-2018-142, 2018
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Jan Saynisch, Christopher Irrgang, and Maik Thomas
Ann. Geophys., 36, 1009–1014, https://doi.org/10.5194/angeo-36-1009-2018, https://doi.org/10.5194/angeo-36-1009-2018, 2018
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By induction, ocean tides generate electromagnetic signals. Since the launch of magnetometer satellite missions, these signals are increasingly used to infer electromagnetic properties of the Earth. In many of these inversions, ocean tide models are used to estimate oceanic tidal electromagnetic signals which are generated via electromagnetic induction. This study's goal is to provide tide model errors for electromagnetic inversion studies.
Johannes Petereit, Jan Saynisch, Christopher Irrgang, Tobias Weber, and Maik Thomas
Ocean Sci., 14, 515–524, https://doi.org/10.5194/os-14-515-2018, https://doi.org/10.5194/os-14-515-2018, 2018
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The study finds that changes in seawater temperature due to El Niño and La Niña, anomalous warm and cold events, are in principle detectable by means of the oceanic tidally induced magnetic field. Furthermore, subsurface processes in the onset of those anomalous events lead the surface processes by several months. This causes a lead in the oceanic tidally induced magnetic field signals over sea-surface temperature signals.
Milena Latinović, Volker Klemann, Christopher Irrgang, Meike Bagge, Sebastian Specht, and Maik Thomas
Clim. Past Discuss., https://doi.org/10.5194/cp-2018-50, https://doi.org/10.5194/cp-2018-50, 2018
Revised manuscript not accepted
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By using geological samples we are trying to validate the models that are reconstructing the sea level in the past 20 000 years. We applied proposed statistical method using 4 types of shells that were found in the area of the Hudson Bay on 140 members of model ensemble. After the comparison of the the results with studies from this area, we concluded that the method is suitable for validation of model ensemble based sea-level change caused by land movement of the Earth due to ice-age burden.
Ingo Sasgen, Alba Martín-Español, Alexander Horvath, Volker Klemann, Elizabeth J. Petrie, Bert Wouters, Martin Horwath, Roland Pail, Jonathan L. Bamber, Peter J. Clarke, Hannes Konrad, Terry Wilson, and Mark R. Drinkwater
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We present a collection of data sets, consisting of surface-elevation rates for Antarctic ice sheet from a combination of Envisat and ICESat, bedrock uplift rates for 118 GPS sites in Antarctica, and optimally filtered GRACE gravity field rates. We provide viscoelastic response functions to a disc load forcing for Earth structures present in East and West Antarctica. This data collection enables a joint inversion for present-day ice-mass changes and glacial isostatic adjustment in Antarctica.
Jorge Bernales, Irina Rogozhina, Ralf Greve, and Maik Thomas
The Cryosphere, 11, 247–265, https://doi.org/10.5194/tc-11-247-2017, https://doi.org/10.5194/tc-11-247-2017, 2017
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This study offers a hard test to the models commonly used to simulate an ice sheet evolution over multimillenial timescales. Using an example of the Antarctic Ice Sheet, we evaluate the performance of such models against observations and highlight a strong impact of different approaches towards modeling rapidly flowing ice sectors. In particular, our results show that inferences of previous studies may need significant adjustments to be adopted by a different type of ice sheet models.
André Düsterhus, Alessio Rovere, Anders E. Carlson, Benjamin P. Horton, Volker Klemann, Lev Tarasov, Natasha L. M. Barlow, Tom Bradwell, Jorie Clark, Andrea Dutton, W. Roland Gehrels, Fiona D. Hibbert, Marc P. Hijma, Nicole Khan, Robert E. Kopp, Dorit Sivan, and Torbjörn E. Törnqvist
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This review/position paper addresses problems in creating new interdisciplinary databases for palaeo-climatological sea-level and ice-sheet data and gives an overview on new advances to tackle them. The focus therein is to define and explain strategies and highlight their importance to allow further progress in these fields. It also offers important insights into the general problem of designing competitive databases which are also applicable to other communities within the palaeo-environment.
I. Sasgen, H. Konrad, E. R. Ivins, M. R. Van den Broeke, J. L. Bamber, Z. Martinec, and V. Klemann
The Cryosphere, 7, 1499–1512, https://doi.org/10.5194/tc-7-1499-2013, https://doi.org/10.5194/tc-7-1499-2013, 2013
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Subject: Predictability, probabilistic forecasts, data assimilation, inverse problems | Topic: Solid earth, continental surface, biogeochemistry | Techniques: Simulation
On parameter bias in earthquake sequence models using data assimilation
Inhomogeneous precursor characteristics of rock with prefabricated cracks before fracture and its implication for earthquake monitoring
Magnitude correlations in a self-similar aftershock rates model of seismicity
Arundhuti Banerjee, Ylona van Dinther, and Femke C. Vossepoel
Nonlin. Processes Geophys., 30, 101–115, https://doi.org/10.5194/npg-30-101-2023, https://doi.org/10.5194/npg-30-101-2023, 2023
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The feasibility of physics-based forecasting of earthquakes depends on how well models can be calibrated to represent earthquake scenarios given uncertainties in both models and data. Our study investigates whether data assimilation can estimate current and future fault states in the presence of a bias in the friction parameter.
Andong Xu, Yonghong Zhao, Muhammad Irfan Ehsan, Jiaying Yang, Qi Zhang, and Ru Liu
Nonlin. Processes Geophys., 28, 379–407, https://doi.org/10.5194/npg-28-379-2021, https://doi.org/10.5194/npg-28-379-2021, 2021
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Earthquake precursors and earthquake monitoring are always important in the earthquake research field, even if there is still debate about the existence of earthquake precursors. The existence of precursory signals is confirmed by our results. We then attempt to capture and quantity precursors before rock fracture, by which we establish a link between the rock experiments and natural earthquakes. We try to make a different type of analysis by comparing their similar characteristics.
Andres F. Zambrano Moreno and Jörn Davidsen
Nonlin. Processes Geophys., 27, 1–9, https://doi.org/10.5194/npg-27-1-2020, https://doi.org/10.5194/npg-27-1-2020, 2020
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We study a model containing the characteristic of self-similarity (invariance under scale) which allows for scaling between lab experiments and geographical-scale seismicity. Particular to this model is the dependency of the earthquake rates on the magnitude difference between events that are causally connected. We present results of a statistical analysis of magnitude correlations for the model along with its implications for the ongoing efforts in earthquake forecasting.
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Short summary
Glacial isostatic adjustment is the delayed reaction of the Earth's lithosphere and mantle to changing mass loads of ice sheets or water. The deformation behaviour of the Earth's surface depends on the ability of the Earth's mantle to flow, i.e. its viscosity. It can be estimated from sea level observations, and in our study, we estimate mantle viscosity using sea level observations from the past. This knowledge is essential for understanding current sea level changes due to melting ice.
Glacial isostatic adjustment is the delayed reaction of the Earth's lithosphere and mantle to...