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  • 1
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    Geology datasets in North America, Greenland and surrounding areas for use with ice sheet models (2018)
    PANGAEA
    In:  Supplement to: Gowan, Evan J; Niu, Lu; Knorr, Gregor; Lohmann, Gerrit (2019): Geology datasets in North America, Greenland and surrounding areas for use with ice sheet models. Earth System Science Data, 11(1), 375-391, https://doi.org/10.5194/essd-11-375-2019
    Details
    Publication Date: 2023-06-30
    Description: This archive contains data files for the sediment properties (distribution and grain size) and bedrock geology for the areas covered by North American ice sheets (including Greenland and Iceland). These datasets are distributed as shapefiles and NetCDF files. These files are intended for use in ice sheet models.
    Keywords: Helmholtz-Verbund Regionale Klimaänderungen = Helmholtz Climate Initiative (Regional Climate Change); NAGS; North America glacial sediment map; Paleo Modelling; PalMod; REKLIM
    Type: Dataset
    Format: application/zip, 213.8 MBytes
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    DATA PANGAEA
  • 2
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    Simulations of millennial-scale climate variability influence on Northern Hemisphere ice sheet mean state (2019)
    PANGAEA
    In:  Supplement to: Niu, Lu; Lohmann, Gerrit; Gowan, Evan J (2019): Climate noise influences ice sheet mean state. Geophysical Research Letters, https://doi.org/10.1029/2019GL083717
    Details
    Publication Date: 2023-06-30
    Description: This study mainly focuses on the millennial-scale climate variability influence on the Northern Hemisphere ice sheet evolution during the past glacial-interglacial cycles. We use the 3D thermodynamical Parallel Ice Sheet Model (PISM) version 0.7.3 to simulate the ice sheets. An index method is used to generate the climate between these states to force the model. In this method, the time-dependent climate evolution is represented by the combination of a time series and two extreme climate conditions. We conducted two experiments. In the first experiment, the ice sheet model is forced with climate that contains millennial-scale oscillations (GL_hf). In the other experiment, the millennial-scale oscillations are removed (GL_lf). The results show that the simulated ice sheet volume is significantly reduced when forced with large amplitude climate fluctuations compared to the case without. Sensitivity experiments are also conducted to see how the amplitude of climate noise affects the simulated ice sheets.
    Keywords: File content; File format; File name; File size; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 50 data points
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    DATA PANGAEA
  • 3
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    Sedimentological, palynological, geochemical, palaeomagnetic, geochronological, and sediment physical investigations of cores 1R to 5R from MARUM-MeBo70 Site PS104_21-3 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-11
    Description: Here we present sedimentological, micropalaeontological, inorganic and organic geochemical, palaeomagnetic, geochronological, and sediment physical data obtained from successional drill cores 1R to 5R at MARUM-MeBo70 Site PS104_21-3 (73.31°S,107.11°W; 882 m water depth). The site is located within the Pine Island cross-shelf trough in the Amundsen Sea Embayment (ASE), West Antarctica and was drilled during RV Polarstern Expedition PS104 in 2017.
    Keywords: climate; Eocene-Oligocene Transition; palaeoenvironment; West Antarctica; West Antarctic Ice Sheet
    Type: Dataset
    Format: application/zip, 14 datasets
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    DATA PANGAEA
  • 4
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    Palynological, palaeomagnetic, and sediment physical investigations of cores 1R to 3R from MARUM-MeBo70 Site PS104_21-2 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-11
    Description: Here we present palynological, palaeomagnetic, and sediment physical data obtained from successional drill cores 1R to 3R at MARUM-MeBo70 Site PS104_21-2 (73.31°S,107.11°W; 882 m water depth). The site is located within the Pine Island cross-shelf trough in the Amundsen Sea Embayment (ASE), West Antarctica and was drilled during RV Polarstern Expedition PS104 in 2017. The site is less than a kilometer away from MARUM-MeBo70 Site PS104_21-3.
    Keywords: climate; Eocene-Oligocene Transition; palaeoenvironment; West Antarctica; West Antarctic Ice Sheet
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 5
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    The sensitivity of Northern Hemisphere ice sheets to atmospheric forcing during the last glacial cycle using PMIP3 models (2019)
    INT GLACIOL SOC
    In:  EPIC3Journal of Glaciology, INT GLACIOL SOC, ISSN: 0022-1430
    Details
    Publication Date: 2019-07-22
    Description: The evolution of Northern Hemisphere ice sheets through the last glacial cycle is simulated with the glacial index method by using the climate forcing from one General Circulation Model, COSMOS. By comparing the simulated results to geological reconstructions, we first show that the modelled climate is capable of capturing the main features of the ice-sheet evolution. However, large deviations exist, likely due to the absence of nonlinear interactions between ice sheet and other climate components. The model uncertainties of the climate forcing are examined using the output from nine climate models from the Paleoclimate Modelling Intercomparison Project Phase III. The results show a large variability in simulated ice sheets between the different models. We find that the ice-sheet extent pattern resembles summer surface air temperature pattern at the Last Glacial Maximum, confirming the dominant role of surface ablation process for high-latitude Northern Hemisphere ice sheets. This study shows the importance of the upper boundary condition for ice-sheet modelling, and implies that careful constraints on climate output is essential for simulating realistic glacial Northern Hemisphere ice sheets.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
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    Climate Noise Influences Ice Sheet Mean State (2019)
    Wiley
    In:  EPIC3Geophysical Research Letters, Wiley, ISSN: 0094-8276
    Details
    Publication Date: 2019-09-16
    Repository Name: EPIC Alfred Wegener Institut
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  • 7
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    Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet (2021)
    ELSEVIER SCIENCE BV
    In:  EPIC3Global and Planetary Change, ELSEVIER SCIENCE BV, 200, pp. 103474, ISSN: 0921-8181
    Details
    Publication Date: 2021-07-01
    Repository Name: EPIC Alfred Wegener Institut
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  • 8
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    Studying the impact of proglacial lakes on ice sheet dynamics (2018)
    In:  EPIC3European Geosciences Union General Assembly 2018, Vienna, 2018-04-09-2018-04-13
    Details
    Publication Date: 2018-04-23
    Description: Proglacial lakes have an important impact on the dynamics of ice sheets by imposing a marine-like boundary condition to the ice margin. At the ice-ocean interface the ice sheet is know to have a complex dynamical behavior. These processes can include the formation of ice shelves that can buttress glaciers, increase subglacial melting, reduce basal friction and calving of icebergs. Such processes also act at the boundaries at ice-marginal lakes, which arose along the ice margins of past continental ice sheets. Some of these lakes spanned several hundreds of kilometers. We have implemented a module into the Parallel Ice Sheet Model (PISM) to study the impacts of proglacial lakes on the ice dynamics. This model dynamically updates the lake basins by filling all depressions of the domain until they overflow. This simple approach does not calculate a water budget and therefore does not rely on an advanced and computationally expensive hydrology model. The lake boundaries are treated in a similar way as a marine boundary. We test this model by reconstructing the evolution of the North American ice sheets by using a transient climate forcing for the last glacial cycle. These reconstructions are then compared to geological records, such as ice margins and paleo-lake shorelines.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
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    Geology datasets in North America, Greenland and surrounding areas for use with ice sheet models (2019)
    Earth System Science Data
    In:  EPIC3Earth System Science Data, Earth System Science Data, 11(1), pp. 375-391, ISSN: 1866-3508
    Details
    Publication Date: 2019-03-18
    Description: The ice–substrate interface is an important boundary condition for ice sheet modelling. The substrate affects the ice sheet by allowing sliding through sediment deformation and accommodating the storage and drainage of subglacial water. We present three datasets on a 1 : 5 000 000 scale with different geological parameters for the region that was covered by the ice sheets in North America, including Greenland and Iceland. The first dataset includes the distribution of surficial sediments, which is separated into continuous, discontinuous and predominantly rock categories. The second dataset includes sediment grain size properties, which is divided into three classes: clay, silt and sand, based on the dominant grain size of the fine fraction of the glacial sediments. The third dataset is the generalized bedrock geology. We demonstrate the utility of these datasets for governing ice sheet dynamics by using an ice sheet model with a simulation that extends through the last glacial cycle. In order to demonstrate the importance of the basal boundary conditions for ice sheet modelling, we changed the shear friction angle to account for a weaker substrate and found changes up to 40 % in ice thickness compared to a reference run. Although incorporation of the ice–bed boundary remains model dependent, our dataset provides an observational baseline for improving a critical weakness in current ice sheet modelling.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 10
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    Role of sediments in controlling the dynamics of paleo-ice sheets (2017)
    In:  EPIC3The 5th PAGES 5th Open Science Meeting, Zaragoza, Spain, 2017-05-09-2017-05-13
    Details
    Publication Date: 2017-12-01
    Description: The motion of glacial ice is predominantly controlled by basal conditions, which include a variety of parameters such as ice rheology, temperature, water content, the presence of sediments, and topography. Soft sediment deformation has long been hypothesized to be a dominant control on the size and dynamics of temperate ice sheets such as the Laurentide Ice Sheet. The transition from hard-bedded regions (areas that lack significant sediment cover) to soft sediment areas put a limit on the maximum volume of these ice sheets. When the ice sheet margin reached soft sediment cover, it may have caused the ice sheet to surge, with global-scale climatic impacts. Current generation ice sheet models only have limited control on how sediments modify the behavior of an ice sheet. We present a model of sediment deformation that can take into account the thickness, lithology and hydrology at the base of the ice sheet using the Parallel Ice Sheet Model (PISM). We assess how changes in sediment properties affect the advance and retreat of the ice sheet, including standstills in the margin when the ice sheet becomes restricted to the hard-bedded interior areas. We apply this model to the Wisconsin Glaciation (~85-11 kyrs ago) of the Laurentide ice sheet. We show how the distribution of sediments affect its growth and retreat. We specifically focus on how the soft bedded Hudson Bay impeded the growth of the ice sheet, up to the lead up to the Last Glacial Maximum. We also investigate the relationship between Dansgaard–Oeschger and Heinrich events and the basal dynamics of the ice sheets.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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