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  • 1
    Online Resource
    Online Resource
    Verbundprojekt PalMod-1-2 - Interaktion verschiedener Skalen : BMBF Förderinitiative Paläo-Modellierung (PalMod) : Laufzeit: 1.9.2015-31.1.2020 : Abschlussbericht = Final report of the joint research project PalMod-1-2 scale interactions (2020)
    [Potsdam] : [Helmholtz-Zentrum Potsdam, GeoForschungsZentrum GFZ]
    Details Availability
    Keywords: Forschungsbericht ; Pleistozän ; Paläoklima ; Modell ; Simulation
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (9 Seiten, 663,09 KB) , Diagramme
    URL: https://doi.org/10.2314/KXP:1761424564
    DOI: 10.2314/KXP:1761424564
    Language: German
    Note: Paralleltitel dem englischen Berichtsblatt entnommen , Förderkennzeichen BMBF 01LP1503A-D , Verbundnummer 01162211 , Durchführende Institution dem englischen Berichtsblatt entnommen , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Sprache der Zusammenfassung: Deutsch, Englisch
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  • 2
    Online Resource
    Online Resource
    BMBF Förderinitiative Paläo Modellierung (PalMod) : Vorhaben (Verbund) PalMod-1-3: Lange transiente Simulationen : Abschlussbericht : Laufzeit: 01.08.2015-30.04.2021 (2021)
    Bremerhaven : Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
    Details Availability
    Keywords: Forschungsbericht ; Pleistozän ; Paläoklima ; Modell ; Simulation ; Meer ; Kohlenstoffkreislauf
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (15 Seiten, 223,21 KB)
    URL: https://doi.org/10.2314/KXP:1828248134
    DOI: 10.2314/KXP:1828248134
    Language: German , English
    Note: Förderkennzeichen BMBF 01LP1504A-D , Verbundnummer 01162215 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Literaturangaben , Sprache der Kurzfassungen: Deutsch, Englisch
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  • 3
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    Altimetry, gravimetry, GPS and viscoelastic modelling data for the joint inversion for glacial isostatic adjustment in Antarctica (ESA STSE Project REGINA), links to data files (2017)
    PANGAEA
    In:  Supplement to: Sasgen, Ingo; Martín-Español, Alba; Horvath, Alexander; Klemann, Volker; Petrie, Elizabeth J; Wouters, Bert; Horwath, Martin; Pail, Roland; Bamber, Jonathan L; Clarke, Peter J; Konrad, Hannes; Wilson, Terry; Drinkwater, Mark R (2018): Altimetry, gravimetry, GPS and viscoelastic modeling data for the joint inversion for glacial isostatic adjustment in Antarctica (ESA STSE Project REGINA). Earth System Science Data, 10(1), 493-523, https://doi.org/10.5194/essd-10-493-2018
    Details
    Publication Date: 2024-04-29
    Description: A major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry, and to a lesser extent satellite altimetry, is the poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA). In the past decade, much progress has been made in consistently modelling the ice sheet and solid Earth interactions; however, forward-modelling solutions of GIA in Antarctica remain uncertain due to the sparsity of constraints on the ice sheet evolution, as well as the Earth's rheological properties. An alternative approach towards estimating GIA is the joint inversion of multiple satellite data - namely, satellite gravimetry, satellite altimetry and GPS, which reflect, with different sensitivities, trends of recent glacial changes and GIA. Crucial to the success of this approach is the accuracy of the space-geodetic data sets. Here, we present reprocessed rates of surface-ice elevation change (Envisat/ICESat; 2003-2009), gravity field change (GRACE; 2003-2009) and bedrock uplift (GPS; 1995-2013). The data analysis is complemented by the forward-modelling of viscoelastic response functions to disc load forcing, allowing us to relate GIA-induced surface displacements with gravity changes for different rheological parameters of the solid Earth. The data and modelling results presented here form the basis for the joint inversion estimate of present-day ice-mass change and GIA in Antarctica. This paper presents the first of two contributions summarizing the work carried out within a European Space Agency funded study, REGINA, (http://www.regina-science.eu).
    Keywords: File content; File name; File size; pan-Antarctica; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 16 data points
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    DATA PANGAEA
  • 4
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    Sea-level evolution of the Laptev Sea and the East Siberian Sea since the last glacial maximum (2015)
    Springer
    In:  Arktos, 1 (Article 1).
    Details
    Publication Date: 2019-09-23
    Description: The Laptev Sea and East Siberian Sea are extended shallow shelf seas which were largely land fallen during glacial periods when the global mean sea level was more than 100 m below its present value. To understand the environmental history, and, in particular, the evolution of the large offshore permafrost complexes in this region, a reconstruction of the sea-level variation and shoreline migration was undertaken. Sufficient geological information by sea-level indicators is missing and, in recent studies, the eustatic sea-level curve is commonly applied, neglecting any isostatic adjustment processes. In this study, we discuss the influence of glacial isostatic adjustment (GIA), which describes the deformational response of the solid earth and the resulting sea-level variations due to the water mass redistribution between ice sheets and ocean during a glacial cycle. Motivated as a sensitivity study, we consider GIA-induced sea-level variations from the last glacial maximum (LGM) to present and apply an earth model ensemble which covers the range of reasonable rheological parametrisations for a passive continental margin. The geodynamically consistent sea-level reconstructions are applied to predict the shoreline retreat in the Laptev and East Siberian seas. We confirm with this study that the application of the eustatic sea-level curve is a valid first-order approximation for reconstructing the shoreline position from LGM to present, whereas the sea-level heights away from the shoreline inferred from the eustatic sea-level curve differ markedly from GIA predictions.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s41063-015-0004-x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    A statistical method to validate reconstructions of late-glacial relative sea level – Application to shallow water shells rated as low-grade sea-level indicators (2018)
    Copernicus
    In:  Climate of the Past Discussions . pp. 1-17.
    Details
    Publication Date: 2018-09-12
    Description: In this study, we propose a statistical method to validate sea-level reconstructions using geological records known as sea-level indicators (SLIs). SLIs are often the only available data to retrace late-glacial relative sea level (RSL). Determining the RSL from SLI height is not straight forward, the elevation at which an SLI was found usually does not represent the past RSL. In contrast, it has to be related to past RSL by investigating sample’s type, habitat and deposition conditions. For instance, water distribution at which a specific specimen is found today can be related to the indicator's depositional height range. Furthermore, the precision of dating varies between geological samples, and, in case of radiocarbon dating, the age has to be calibrated using a non-linear calibration curve. To avoid an a-priori assumption like normal-distributed uncertainties, we define likelihood functions which take into account the indicative meaning’s available error information and calibration statistics represented by joint probabilities. For this conceptional study, we restrict ourselves to one type of indicators, shallow-water shells, which are usually considered as low-grade samples giving only a lower limit of former sea level, as the depth range in which they live spreads over several tens of meters, and does not follow a normal distribution. The presented method is aimed to serve as a strategy for glacial isostatic adjustment reconstructions, in this case for the German Paleo-Climate Modelling Initiative PalMod (https://www.palmod.de/en) and by extending it to other SLI types.
    Type: Article , NonPeerReviewed
    Format: text
    Format: text
    DOI: 10.5194/cp-2018-50
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    OceanRep: Article in a Scientific Journal - without review
  • 6
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    Data assimilation for a visco-elastic Earth deformation model (2020)
    In:  [Talk] In: EGU General Assembly 2020, 03.05.-08.05.2020, Online .
    Details
    Publication Date: 2021-05-04
    Description: We present a data assimilation algorithm for the time-domain spectral-finite element code VILMA. We consider a 1D earth structure and a prescribed glaciation history ICE5G for the external mass load forcing. We use the Parallel Data Assimilation Framework (PDAF) to assimilate sea level data into the model in order to obtain better estimates of the viscosity structure of mantle and lithosphere. For this purpose, we apply a particle filter in which an ensemble of models is propagated in time, starting shortly before the last glacial maximum. At epochs when observations are available, each particle's performance is estimated and they are resampled based on their performance to form a new ensemble that better resembles the true viscosity distribution. In a proof of concept we show that with this method it is possible to reconstruct a synthetic viscosity distribution from which synthetic data were constructed. In a second step, paleo sea level data are used to infer an optimised 1D viscosity distribution.
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
    DOI: 10.5194/egusphere-egu2020-3024
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    OceanRep: Talk
  • 7
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    Dependence of late glacial sea-level predictions on 3D Earth structure (2020)
    In:  [Talk] In: EGU General Assembly 2020, 03.05.-08.05.2020, Online .
    Details
    Publication Date: 2021-05-04
    Description: Glacial isostatic adjustment is dominated by Earth rheology resulting in a variability of relative sea-level (RSL) predictions of more than 100 meters during the last glacial cycle. Seismic tomography models reveal significant lateral variations in seismic wavespeed, most likely corresponding to variations in temperature and hence viscosity. Therefore, the replacement of 1D Earth structures by a 3D Earth structure is an essential part of recent research to reveal the impact of lateral viscosity contrasts and to achieve a more consistent view on solid-Earth dynamics. Here, we apply the VIscoelastic Lithosphere and MAntle model VILMA to predict RSL during the last deglaciation. We create an ensemble of geodynamically constrained 3D Earth structures which is based on seismic tomography models while considering a range of conversion factors to transfer seismic velocity variations into viscosity variations. For a number of globally distributed sites, we discuss the resulting variability in RSL predictions, compare this with regionally optimized 1D Earth structures, and validate the model results with relative sea-level data (sea-level indicators). This study is part of the German Climate Modeling initiative PalMod aiming the modeling of the last glacial cycle under consideration of a coupled Earth system model, i.e. including feedbacks between ice-sheets and the solid Earth.
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
    DOI: 10.5194/egusphere-egu2020-7699
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    OceanRep: Talk
  • 8
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    Palaeo-sea-level and palaeo-ice-sheet databases: problems, strategies, and perspectives (2016)
    Copernicus Publications (EGU)
    In:  Climate of the Past, 12 (4). pp. 911-921.
    Details
    Publication Date: 2020-04-09
    Description: Sea-level and ice-sheet databases have driven numerous advances in understanding the Earth system. We describe the challenges and offer best strategies that can be adopted to build self-consistent and standardised databases of geological and geochemical information used to archive palaeo-sea-levels and palaeo-ice-sheets. There are three phases in the development of a database: (i) measurement, (ii) interpretation, and (iii) database creation. Measurement should include the objective description of the position and age of a sample, description of associated geological features, and quantification of uncertainties. Interpretation of the sample may have a subjective component, but it should always include uncertainties and alternative or contrasting interpretations, with any exclusion of existing interpretations requiring a full justification. During the creation of a database, an approach based on accessibility, transparency, trust, availability, continuity, completeness, and communication of content (ATTAC3) must be adopted. It is essential to consider the community that creates and benefits from a database. We conclude that funding agencies should not only consider the creation of original data in specific research-question-oriented projects, but also include the possibility of using part of the funding for IT-related and database creation tasks, which are essential to guarantee accessibility and maintenance of the collected data.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/cp-12-911-2016
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Sea level evolution of Laptev and East Siberian Sea - evidence from geological data and glacial isostatic adjustment (2014)
    GeoUnion Alfred-Wegener-Stiftung
    In:  [Talk] In: international REKLIM Conference “Our Climate – Our Future, Regional Perspectives on a Global Challenge” , 06.10.-09.10.2014, Berlin . Our Climate – Our Future : Regional Perspectives on a Global Challenge ; International REKLIM Conference, 6 - 9 October, 2014, Umweltforum Auferstehungskirche, Berlin, Germany ; Program and Abstracts / REKLIM, Helmholtzverbund Regionale Klimaänderungen ; Helmholtz Association ; p. 60 .
    Details
    Publication Date: 2019-09-23
    Description: Laptev Sea and East Siberian Sea are extended shallow shelf seas which were partly land-fallen during glaciated times where the global mean sea level (GMSL) was about -120 m below its present value. At the same time tectonic activity is present, which is evident in uplifted marine terraces of the New Siberian Islands. The marine terraces may be identified and mapped in historical airborne photographs and recent radar imagery. To improve the environmental history of this region a reconstruction of the sea level and shore line migration is necessary which is based on modelling the glacial isostatic adjustment (GIA) including levering. GIA describes the deformational response of the solid earth to the glacially related water-mass redistribution, whereas levering only describes the deformational response of the solid earth to the varying ocean load. For these shallow seas, we expect a deviation from the GMSL between +10 and +30 m by levering alone and due to the vicinity to the Pleistocene ice sheets a further correction at the order of +10 m. These mechanisms reduce therefore the GMSL drop of sea level between 10 and 30 % at last glacial maximum and markedly influence the following evolution of sea level. The variability is dominated by the rheological earth structure considered in the modelling. As the limited knowledge of the rheological earth structure hinders realistic predictions of GIA for this region we will first discuss the variability of sea level history due to GIA for the last 20,000 yr. Then, we will constrain the model dependent variability by consideration of geological proxies of sea level change for this region. Analyses on Laptev Sea sediment cores will reveal a detailed chronology of changing water masses linked to sea level rise.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 10
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    Relaxation behavior of a laterally varying earth model in response to glacial loading (2020)
    Details
    Publication Date: 2022-03-16
    Description: Viscoelastic deformations of an earth structure in response to a time-varying surface load are analyzed in glacial isostatic adjustment (GIA). When solving this problem, aspects like flexure of the lithosphere and retarded response of mantle material become evident. Quantified are these by flexural rigidity and relaxation times. The concepts partly lose their relevance when changing from a 1D earth structure (only radial variations) to a 2D or a 3D earth structure (lateral variations). In regions like Fennoscandia and Laurentide, which are affected by GIA, lateral variations of the lithosphere and mantle structure are moderate and, so, the application of a 1D earth structure is widely accepted. But, also for these two regions one has to keep in mind that the respective 1D earth structures differ and that such an approximation mainly holds in the central part of the respective region. In contrast, lateral variations or a local structure of different viscosity have to be considered in areas like Patagonia, Antarctica or Alaska which is located above tectonic activity or covers a region with significant lateral changes in earth structure. But, already for the two former examples one has to keep in mind that the respective 1D earth structures inferred from GIA modelling differ between the two regions. Focusing on the relaxation behavior and the mantle-material transport, we discuss the effect of lateral variations on the deformation process. We will assess to which extent a 1D earth structure can represent lateral variability in structural features, and, at which point a 3D earth structure has to be considered. Such questions are of concern, when discussing GIA for geodetic applications as well as in earth system modeling as this study contributes to the climate modeling initiative Palmod.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
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